RESUMEN

Compelling evidences suggest that transplantation of bone marrow-derived mesenchymal stem cells (BM-MSCs) can be therapeutically effective for central nervous system (CNS) injuries and neurodegenerative diseases. The therapeutic effect of BM-MSCs mainly attributes to their differentiation into neuron-like cells which replace injured and degenerative neurons. Importantly, the neurotrophic factors released from BM-MSCs can also rescue injured and degenerative neurons, which plays a biologically pivotal role in enhancing neuroregeneration and neurological functional recovery. Tetramethylpyrazine (TMP), the main bioactive ingredient extracted from the traditional Chinese medicinal herb Chuanxiong, has been reported to promote the neuronal differentiation of BM-MSCs. This study aimed to investigate whether TMP regulates the release of neurotrophic factors from BM-MSCs. We examined the effect of TMP on brain-derived neurotrophic factor (BDNF) released from BM-MSCs and elucidated the underlying molecular mechanism. Our results demonstrated that TMP at concentrations of lower than 200 µM increased the release of BDNF in a dose-dependent manner. Furthermore, the effect of TMP on increasing the release of BDNF from BM-MSCs was blocked by inhibiting the phosphatidylinositol-4,5-bisphosphate 3-kinase (PI3K)/protein kinase B (AKT)/cAMP-response element binding protein (CREB) pathway. Therefore, we concluded that TMP could induce the release of BDNF from BM-MSCs through activation of the PI3K/AKT/CREB pathway, leading to the formation of neuroprotective and proneurogenic microenvironment. These findings suggest that TMP possesses novel therapeutic potential to promote neuroprotection and neurogenesis through improving the neurotrophic ability of BM-MSCs, which provides a promising nutritional prevention and treatment strategy for CNS injuries and neurodegenerative diseases via the transplantation of TMP-treated BM-MSCs.

Asunto(s)

Factor Neurotrófico Derivado del Encéfalo/metabolismo , Proteína de Unión a Elemento de Respuesta al AMP Cíclico/metabolismo , Células Madre Mesenquimatosas/efectos de los fármacos , Fosfatidilinositol 3-Quinasas/metabolismo , Proteínas Proto-Oncogénicas c-akt/metabolismo , Pirazinas/farmacología , Transducción de Señal/efectos de los fármacos , Animales , Masculino , Células Madre Mesenquimatosas/metabolismo , Neurogénesis/efectos de los fármacos , Neuronas/efectos de los fármacos , Neuronas/metabolismo , Ratas , Ratas Sprague-Dawley

RESUMEN

Fluoxetine, an anti-depressant drug, has recently been shown to provide neuroprotection in central nervous system injury, but its roles in subarachnoid hemorrhage (SAH) remain unclear. In this study, we aimed to evaluate whether fluoxetine attenuates early brain injury (EBI) after SAH. We demonstrated that intraperitoneal injection of fluoxetine (10 mg/kg per day) significantly attenuated brain edema and blood-brain barrier (BBB) disruption, microglial activation, and neuronal apoptosis in EBI after experimental SAH, as evidenced by the reduction of brain water content and Evans blue dye extravasation, prevention of disruption of the tight junction proteins zonula occludens-1, claudin-5, and occludin, a decrease of cells staining positive for Iba-1, ED-1, and TUNEL and a decline in IL-1ß, IL-6, TNF-α, MDA, 3-nitrotyrosine, and 8-OHDG levels. Moreover, fluoxetine significantly improved the neurological deficits of EBI and long-term sensorimotor behavioral deficits following SAH in a rat model. These results indicated that fluoxetine has a neuroprotective effect after experimental SAH.

Asunto(s)

Apoptosis/efectos de los fármacos , Citocinas/metabolismo , Fluoxetina/farmacología , Fluoxetina/uso terapéutico , Hemorragia Subaracnoidea/tratamiento farmacológico , Animales , Barrera Hematoencefálica/efectos de los fármacos , Edema Encefálico/tratamiento farmacológico , Edema Encefálico/etiología , Citocinas/genética , Modelos Animales de Enfermedad , Etiquetado Corte-Fin in Situ , Masculino , Fármacos Neuroprotectores/farmacología , Fármacos Neuroprotectores/uso terapéutico , Dimensión del Dolor , Desempeño Psicomotor/efectos de los fármacos , ARN Mensajero/metabolismo , Ratas , Ratas Sprague-Dawley , Hemorragia Subaracnoidea/complicaciones , Hemorragia Subaracnoidea/patología , Factores de Tiempo , Vasoespasmo Intracraneal/tratamiento farmacológico , Vasoespasmo Intracraneal/etiología

RESUMEN

Necroptosis, a novel form of programmed cell death, was recently shown to be strongly associated with intestinal inflammation in mice and in pediatric patients with inflammatory bowel disease (IBD). Persistent inflammation of the colon is an important risk factor for colorectal cancer. Necrostatin-1 (Nec-1), known as a specific inhibitor of necroptosis, through preventing the receptor-interacting protein (RIP) 1 and RIP3 interaction. In the present study, the anti-inflammatory and antitumorigenic efficacy of necrostatin-1 was studied in mouse models of colitis and colitis-associated cancer (CAC). We found that in acute dextran sulfate sodium (DSS)-induced colitis, treatment with necrostatin-1 significantly suppressed colitis symptoms in mice, including weight loss, colon shortening, colonic mucosa damage and severity, and excessive production of interleukin-6. Necrostatin-1 administration inhibited the upregulation of RIP1 and RIP3 and enhanced the expression of caspase-8 in DSS-induced colitis. In addition, the anti-inflammatory effect of necrostatin-1 was confirmed by in vitro analyses. Necrostatin-1 treatment reduced the production of proinflammatory cytokine and extracellular HMGB1 release in HT-29 cells in active necroptosis. Furthermore, In a mouse model of colitis-associated tumorigenesis, necrostatin-1 administration significantly suppressed tumor growth and development through inhibiting JNK/c-Jun signaling. Taken together, these findings suggest that necrostatin-1 might be a promising therapeutic option for the treatment of colitis-associated colorectal cancer in patients with IBD.

RESUMEN

Oscillations in intracellular Ca2+ concentrations ([Ca2+]i) mediate various cellular function. Although it is known that [Ca2+]i oscillations are susceptible to dysregulation in tumors, the tumor-specific regulators of [Ca2+]i oscillations are poorly characterized. We discovered that CD147 promotes hepatocellular carcinoma (HCC) metastasis and proliferation by enhancing the amplitude and frequency of [Ca2+]i oscillations in HCC cells. CD147 activates two distinct signaling pathways to regulate [Ca2+]i oscillations. By activating FAK-Src-IP3R1 signaling pathway, CD147 promotes Ca2+ release from endoplasmic reticulum (ER) and enhances the amplitude of [Ca2+]i oscillations. Furthermore, CD147 accelerates ER Ca2+refilling and enhances the frequency of [Ca2+]i oscillations through activating CaMKP-PAK1-PP2A-PLB-SERCA signaling pathway. Besides, CD147-promoted ER Ca2+ release and refilling are tightly regulated by changing [Ca2+]i. CD147 may activate IP3R1 channel under low [Ca2+]i conditions and CD147 may activate SERCA pump under high [Ca2+]i conditions. CD147 deletion suppresses HCC tumorigenesis and increases the survival rate of liver-specific CD147 knockout mice by regulating [Ca2+]i oscillations in vivo. Together, these results reveal that CD147 functions as a critical regulator of ER-dependent [Ca2+]i oscillations to promote oncogenic progression in HCC.

Asunto(s)

Basigina/metabolismo , Señalización del Calcio/fisiología , Carcinoma Hepatocelular/patología , Neoplasias Hepáticas/patología , Animales , Western Blotting , Carcinoma Hepatocelular/metabolismo , Línea Celular Tumoral , Proliferación Celular/fisiología , Progresión de la Enfermedad , Técnicas de Silenciamiento del Gen , Humanos , Inmunoprecipitación , Neoplasias Hepáticas/metabolismo , Masculino , Ratones , Ratones Endogámicos C57BL , Ratones Transgénicos , Invasividad Neoplásica/patología , ARN Interferente Pequeño , Reacción en Cadena de la Polimerasa de Transcriptasa Inversa , Transfección

RESUMEN

Apoptosis of bone marrow-derived mesenchymal stem cells (BMMSCs) is an essential pathogenic factor of osteoporosis. Ginsenoside-Rb2 (Rb2), a 20(S)-protopanaxadiol glycoside extracted from ginseng, is a potent treatment for bone loss, which raises interest regarding the bone metabolism area. In the present study, we found that dose-response Rb2 inhibited high dosage of dexamethasone (Dex)-induced apoptosis in primary murine BMMSCs. Interestingly, Rb2 promoted GPR120 induction, which is the unsaturated long-chain fatty acid receptor. We further confirmed that GPR120-specific ShRNA reversed the inhibition of Rb2 on Dex-induced apoptosis by activating caspase-3 and reducing cell viability. In addition, Rb2 notably increased phosphorylated ERK1/2 levels and Ras kinase activity dependently through the GPR120. The ERK1/2 activity-specific inhibitor U0126 remarkably blocked the Rb2-induced antiapoptotic effect in response to Dex-induced apoptosis. Together, dose-response Rb2 protected BMMSCs against Dex-induced apoptosis dependently by inducing GPR120 promoted Ras-ERK1/2 signaling pathway. Therefore, in the prevalence of the abuse of Dex in the clinic, our findings suggest for the first time that Rb2 is not only a key to understand the link between Chinese medicine and the pathology of osteoporosis but also an underlying target for the treatment of bone complications in the foreseeable future.

Asunto(s)

Antineoplásicos/farmacología , Apoptosis , Ginsenósidos/farmacología , Células Madre Mesenquimatosas/efectos de los fármacos , Receptores Acoplados a Proteínas G/metabolismo , Animales , Células Cultivadas , Dexametasona/toxicidad , Células Madre Mesenquimatosas/metabolismo , Ratones , Ratones Endogámicos C57BL , Receptores Acoplados a Proteínas G/genética

RESUMEN

Glucocorticoid­induced osteoporosis (GIOP) is a widespread clinical complication following glucocorticoid therapy. This irreversible damage to bone­forming and ­resorbing cells is essential in the pathogenesis of osteoporosis. Autophagy is a physiological process involved in the regulation of cells and their responses to diverse stimuli, however, the role of autophagy in glucocorticoid­induced damage to bone marrow mesenchymal stem cells (BMSCs) remains unclear. The current study confirmed that glucocorticoid administration impaired the proliferation of BMSCs. Transmission electron microscopy, immunohistochemistry and western blot analysis detected autophagy in vitro and in GIOP model rats (in vivo). With the addition of the autophagy inhibitor 3­methyladenine, the proliferative ability of BMSCs was further reduced, while the number of apoptotic BMSCs was significantly increased. The data suggests that in response to glucocorticoid administration, induced autophagy aids to maintain proliferation and prevent apoptosis of BMSCs. Thus, it is hypothesized that autophagy may be a novel target in the treatment or prevention of osteoporosis.

Asunto(s)

Autofagia/efectos de los fármacos , Glucocorticoides/farmacología , Células Madre Mesenquimatosas/efectos de los fármacos , Células Madre Mesenquimatosas/metabolismo , Animales , Apoptosis/efectos de los fármacos , Proliferación Celular/efectos de los fármacos , Dexametasona/efectos adversos , Dexametasona/farmacología , Modelos Animales de Enfermedad , Femenino , Glucocorticoides/efectos adversos , Células Madre Mesenquimatosas/patología , Osteoporosis/inducido químicamente , Ratas

RESUMEN

Fat infiltration within marrow cavity is one of multitudinous features of estrogen deficiency, which leads to a decline in bone formation functionality. The origin of this fat is unclear, but one possibility is that it is derived from osteoblasts, which transdifferentiate into adipocytes that produce bone marrow fat. We examined the dose-dependent effect of 17ß-estradiol on the ability of MC3T3-E1 cells and murine bone marrow-derived mesenchymal stem cell (BMMSC)-derived osteoblasts to undergo osteo-adipogenic transdifferentiation. We found that 17ß-estradiol significantly increased alkaline phosphatase activity (P<0.05); calcium deposition; and Alp, Col1a1, Runx2, and Ocn expression levels dose-dependently. By contrast, 17ß-estradiol significantly decreased the number and size of lipid droplets, and Fabp4 and PPARγ expression levels during osteo-adipogenic transdifferentiation (P<0.05). Moreover, the expression levels of brown adipocyte markers (Myf5, Elovl3, and Cidea) and undifferentiated adipocyte markers (Dlk1, Gata2, and Wnt10b) were also affected by 17ß-estradiol during osteo-adipogenic transdifferentiation. Western blotting and immunostaining further showed that canonical Wnt signaling can be activated by estrogen to exert its inhibitory effect of osteo-adipogenesis. This is the first study to demonstrate the dose-dependent effect of 17ß-estradiol on the osteo-adipogenic transdifferentiation of MC3T3-E1 cells and BMMSCs likely via canonical Wnt signaling. In summary, our results indicate that osteo-adipogenic transdifferentiation modulated by canonical Wnt signaling pathway in bone metabolism may be a new explanation for the gradually increased bone marrow fat in estrogen-inefficient condition.

Asunto(s)

Tejido Adiposo/citología , Diferenciación Celular/efectos de los fármacos , Estrógenos/farmacología , Osteoblastos/citología , Vía de Señalización Wnt , Animales , Secuencia de Bases , Células Cultivadas , Cartilla de ADN , Relación Dosis-Respuesta a Droga , Femenino , Ratones , Ratones Endogámicos C57BL , Ovariectomía

RESUMEN

Although many studies have suggested that estrogen prevents postmenopausal bone loss partially due to its anti-apoptosis effects in osteoblasts, the underlying mechanism has not been fully elucidated. In the present study, we found that 17ß-estradiol (17ß-E2), one of the primary estrogens, inhibited endoplasmic reticulum (ER) stress-induced apoptosis in MC3T3-E1 cells and primary osteoblasts. Interestingly, 17ß-E2-promoted Grp78 induction, but not CHOP induction in response to ER stress. We further confirmed that Grp78-specific siRNA reversed the inhibition of 17ß-E2 on ER stress-induced apoptosis by activating caspase-12 and caspase-3. Moreover, we found that 17ß-E2 markedly increased the phosphorylated TFII-I levels and nuclear localization of TFII-I in ER stress conditions. 17ß-E2 stimulated Grp78 promoter activity in a dose-dependent manner in the presence of TFII-I and enhanced the binding of TFII-I to the Grp78 promoter. In addition, 17ß-E2 notably increased phosphorylated ERK1/2 levels and Ras kinase activity in MC3T3-E1 cells. The ERK1/2 activity-specific inhibitor U0126 remarkably blocked 17ß-E2-induced TFII-I phosphorylation and Grp78 expression in response to ER stress. Together, 17ß-E2 protected MC3T3-E1 cells against ER stress-induced apoptosis by promoting Ras-ERK1/2-TFII-I signaling pathway-dependent Grp78 induction.

Asunto(s)

Apoptosis/efectos de los fármacos , Conservadores de la Densidad Ósea/farmacología , Estrés del Retículo Endoplásmico/efectos de los fármacos , Estradiol/farmacología , Proteínas de Choque Térmico/agonistas , Osteoblastos/efectos de los fármacos , Factor de Transcripción TFIIA/agonistas , Animales , Animales Recién Nacidos , Conservadores de la Densidad Ósea/química , Conservadores de la Densidad Ósea/uso terapéutico , Línea Celular , Células Cultivadas , Chaperón BiP del Retículo Endoplásmico , Estradiol/química , Estradiol/uso terapéutico , Estrógenos/química , Estrógenos/farmacología , Estrógenos/uso terapéutico , Proteínas de Choque Térmico/antagonistas & inhibidores , Proteínas de Choque Térmico/genética , Proteínas de Choque Térmico/metabolismo , Humanos , Ratones , Ratones Endogámicos C57BL , Osteoblastos/citología , Osteoblastos/metabolismo , Osteoporosis/inducido químicamente , Osteoporosis/metabolismo , Osteoporosis/prevención & control , Fosforilación/efectos de los fármacos , Regiones Promotoras Genéticas/efectos de los fármacos , Procesamiento Proteico-Postraduccional/efectos de los fármacos , Interferencia de ARN , Distribución Aleatoria , Proteínas Recombinantes/química , Proteínas Recombinantes/metabolismo , Factor de Transcripción TFIIA/genética , Factor de Transcripción TFIIA/metabolismo

RESUMEN

Osteosarcoma, the most common primary bone tumor in children and young adolescents, is characterized by local invasion and distant metastasis. But the detailed mechanisms of osteosarcoma metastasis are not well known. In the present study, we found that ßig-h3 promotes metastatic potential of human osteosarcoma cells in vitro and in vivo. Furthermore, ßig-h3 co-localized with integrin α2ß1 in osteosarcoma cells. But ßig-h3 did not change integrin α2ß1 expression in Saos-2 cells. Interaction of ßig-h3 with integrin α2ß1 mediates metastasis of human osteosarcoma cells. The second FAS1 domain of ßig-h3 but not the first FAS1 domain, the third FAS1 domain or the fourth FAS1 domain mediates human osteosarcoma cells metastasis, which is the α2ß1 integrin-interacting domain. We further demonstrated that PI3K/AKT signaling pathway is involved in ßig-h3-induced human osteosarcoma cells metastasis process. Together, these results reveal ßig-h3 enhances the metastasis potentials of human osteosarcoma cells via integrin α2ß1-mediated PI3K/AKT signal pathways. The discovery of ßig-h3-mediated pathway helps us to understand the mechanism of human osteosarcoma metastasis and provides evidence for the possibility that ßig-h3 can be a potential therapeutic target for osteosarcoma treatment.

Asunto(s)

Proteínas de la Matriz Extracelular/metabolismo , Integrina alfa2beta1/metabolismo , Osteosarcoma/enzimología , Osteosarcoma/patología , Fosfatidilinositol 3-Quinasas/metabolismo , Transducción de Señal , Factor de Crecimiento Transformador beta/metabolismo , Adhesión Celular , Línea Celular Tumoral , Movimiento Celular , Regulación hacia Abajo , Activación Enzimática , Proteínas de la Matriz Extracelular/química , Humanos , Inmunoprecipitación , Invasividad Neoplásica , Metástasis de la Neoplasia , Unión Proteica , Estructura Terciaria de Proteína , Factor de Crecimiento Transformador beta/química

RESUMEN

The intervertebral disc is the largest avascular organ in the human body. However, with the progress of intervertebral disc degeneration (IDD), the disc tends to be vascularized increasingly via angiogenesis. It is well established that both human nucleus pulposus (NP) cells and vascular endothelial cells express FasL and Fas. However, the issue remains open as to whether there are certain active mechanisms preventing angiogenesis in the disc via the FasL-Fas machinery. Here, we established a co-culture system of human NP cells and vascular endothelial (HMEC-1) cells. We found that normal NP cells were more capable of inducing apoptosis in HMEC-1 cells (14.2±3.4%) than degenerate NP cells (6.7±1.9%), p<0.05. By up-regulating the FasL expression in degenerate NP cells, we found that FasL played an essential role in the mediation of HMEC-1 cell apoptosis with the activation of downstream FADD and caspase-3. Furthermore, we found an increased Fas expression in HMEC-1 cells following co-cultured with NP cells, which might be closely linked with FasL produced by NP cells and enhance their interaction. Collectively, this is the first study showing FasL-Fas network might plays an important role in the molecular mechanisms of angiogenesis avoidance of human disc. Consequently, our findings might shed light on the pathogenesis in human IDD and provide a novel target for the treatment strategies for IDD.

Asunto(s)

Apoptosis , Células Endoteliales/metabolismo , Proteína Ligando Fas/metabolismo , Degeneración del Disco Intervertebral/metabolismo , Disco Intervertebral/metabolismo , Neovascularización Patológica , Receptor fas/metabolismo , Adulto , Caspasa 3/metabolismo , Células Cultivadas , Técnicas de Cocultivo , Células Endoteliales/patología , Proteína de Dominio de Muerte Asociada a Fas/metabolismo , Femenino , Humanos , Disco Intervertebral/patología , Degeneración del Disco Intervertebral/patología , Masculino , Persona de Mediana Edad , Comunicación Paracrina , Transducción de Señal

RESUMEN

Cytokeratin 8 (CK8) is a member of the cytokeratins family with multiple functions on the basis of its unique structural hallmark. The aberrant expression of CK8 and its phosphorylation are pertinent with various diseases. We have previously shown that CK8 exists in normal human nucleus pulposus (NP) cells and decreases as the intervertebral disc degenerates. However, the underlying molecular regulatory machinery of CK8 in intervertebral disc degeneration (IDD) has not been clarified. Here, we collected NP samples from patients with idiopathic scoliosis as control and IDD as degenerate groups. We found that CK8 expression decreased in IDD with an increased phosphorylation in degenerate NP cells. Moreover, NP cells were cultured under different compressive load schemes for diverse time duration. We found that compressive loads resulted in phosphorylation and disassembly of CK8 in a time-dependent and degree-dependent manner in vitro. The activation of protein kinase C was a significant molecular factor contributing to this phenomenon. Taken together, this study is the first to address the molecular mechanisms of CK8 downregulation in NP cells. Importantly, our findings provide clues regarding a molecular link between compressive loads and CK8 alterations, which shed a novel light on the etiology of IDD.

Asunto(s)

Degeneración del Disco Intervertebral/enzimología , Queratina-8/metabolismo , Proteína Quinasa C-epsilon/metabolismo , Estrés Mecánico , Adolescente , Adulto , Regulación hacia Abajo/fisiología , Humanos , Fosforilación , Columna Vertebral/fisiología , Regulación hacia Arriba/fisiología , Soporte de Peso , Adulto Joven

RESUMEN

The study aimed for addressing the expression of soluble Fas (sFas) and soluble Fas Ligand (sFasL) in human nucleus pulposus (NP) and its attendant relationship with disc degeneration. Human NP samples were collected from patients with disc degeneration and cadavers as degenerate and normal groups, respectively. Subsequently, NP cells were cultured in monolayer. ELISA was performed to identify the expression levels of sFas and sFasL in the supernatant of NP cell cultures in vitro. Quantitative real-time PCR was used to detect the expression of sFas and sFasL in human NP cells in mRNA solution. The study comprised 12 degenerate and 8 normal cadaveric NP samples. The concentration value of sFas in the supernatant was significantly higher from degenerate NP than that from normal NP at each time point. In contrast, sFasL was significantly lower at each time point. Moreover, the expression of sFas and sFasL reached the peak at various early stages of cell cultures and decreased thereafter. Furthermore, the mRNA level of Fas in degenerate NP cells was significantly higher than that in normal cells; whereas FasL showed an opposite pattern. The study is the first addressing the expression of sFas and sFasL in human NP cell cultures. Moreover, the expression of sFas and sFasL varies with culture time in vitro with different levels in degenerate and normal settings. These findings indicate that sFas and sFasL might play a role in intervertebral disc degeneration.

Asunto(s)

Proteína Ligando Fas/biosíntesis , Degeneración del Disco Intervertebral/metabolismo , Disco Intervertebral/metabolismo , Receptor fas/biosíntesis , Adulto , Células Cultivadas , Ensayo de Inmunoadsorción Enzimática , Proteína Ligando Fas/análisis , Femenino , Humanos , Disco Intervertebral/patología , Degeneración del Disco Intervertebral/patología , Masculino , Reacción en Cadena en Tiempo Real de la Polimerasa , Adulto Joven , Receptor fas/análisis

RESUMEN

Calpains are a conserved family of calcium-dependent cysteine proteinases involved in various cellular functions. Two ubiquitous isoforms, µ- and m-calpain, are key members of the calpain family that play essential roles in regulating cell migration and invasion. However, it remains unclear whether they are involved in the progression of hepatocellular carcinoma (HCC). Here, we investigated the functions of µ- and m-calpain in the invasive and metastatic processes of human hepatoma cells. Our results indicated that the expression levels of calpains were elevated in HCC cells compared with those in normal hepatic cells. Our results indicated that small interfering RNA (siRNA)-mediated silencing of µ- and m-calpain expressions significantly suppressed the adhesive, migrative and invasive potentials of human hepatoma cells. The matrix metalloproteinases (MMPs) are key regulators of malignant tumour invasion and metastasis. siRNA-mediated down-regulation of µ- and m-calpain expressions also significantly attenuated MMP-2 and MMP-9 secretion. Thus µ- and m-calpain may play important roles in the invasion and metastasis of human hepatoma cells, and calpains may be drug targets for preventing HCC metastasis.

Asunto(s)

Calpaína/metabolismo , Calpaína/antagonistas & inhibidores , Calpaína/genética , Carcinoma Hepatocelular/metabolismo , Carcinoma Hepatocelular/patología , Adhesión Celular , Línea Celular , Movimiento Celular , Regulación hacia Abajo , Células Hep G2 , Humanos , Neoplasias Hepáticas/metabolismo , Neoplasias Hepáticas/patología , Metaloproteinasa 2 de la Matriz/metabolismo , Metaloproteinasa 9 de la Matriz/metabolismo , Interferencia de ARN , ARN Interferente Pequeño/metabolismo

RESUMEN

Bladder cancer-associated protein (BLCAP) is a novel candidate tumor suppressor gene identified from human bladder carcinoma and highly associated with the invasion of bladder cancer. We previously reported that it also plays a key role in the tumorigenesis and metastasis of human osteosarcoma. In the present study, we constructed a recombinant encoding BLCAP cDNA. Overexpression of BLCAP resulted in growth inhibition and induced apoptosis of human TC-135 Ewing's sarcoma cells in vitro. We further investigated the caspase-3/7 activity and expressions of the fusion transcription factor Ewing's sarcoma protein-friend leukemia virus integration 1 (EWS-FLI1) and the apoptosis regulator B-cell lymphoma 2 (BCL-2). Cell apoptosis was accompanied by the down-regulated expression of EWS-FLI1 and BCL-2. Our present results suggest that BLCAP may play a role not only in regulating cell proliferation but also in coordinating apoptosis through the down-regulation of BCL-2 and EWS-FLI1 in human Ewing's sarcoma cells.

Asunto(s)

Apoptosis/efectos de los fármacos , Proteínas de Neoplasias/farmacología , Sarcoma de Ewing/metabolismo , Western Blotting , Caspasa 3/metabolismo , Caspasa 7/metabolismo , Línea Celular Tumoral , Regulación hacia Abajo , Regulación Neoplásica de la Expresión Génica/efectos de los fármacos , Humanos , Proteínas de Fusión Oncogénica/biosíntesis , Proteína Proto-Oncogénica c-fli-1/biosíntesis , Proteínas Proto-Oncogénicas c-bcl-2/biosíntesis , Proteína EWS de Unión a ARN/biosíntesis , Proteínas Recombinantes/farmacología , Reacción en Cadena de la Polimerasa de Transcriptasa Inversa

RESUMEN

UNLABELLED: Tumor cells can move as individual cells in two interconvertible modes: mesenchymal mode and amoeboid mode. Cytoskeleton rearrangement plays an important role in the interconversion. Previously, we reported that HAb18G/CD147 and annexin II are interacting proteins involved in cytoskeleton rearrangement, yet the role of their interaction is unclear. In this study we found that the depletion of HAb18G/CD147 produced a rounded morphology, which is associated with amoeboid movement, whereas the depletion of annexin II resulted in an elongated morphology, which is associated with mesenchymal movement. The extracellular portion of HAb18G/CD147 can interact with a phosphorylation-inactive mutant of annexin II and inhibit its phosphorylation. HAb18G/CD147 inhibits Rho signaling pathways and amoeboid movement by inhibiting annexin II phosphorylation, promotes membrane localization of WAVE2 and Rac1 activation by way of the integrin-FAK-PI3K/PIP3 signaling pathway, and promotes the formation of lamellipodia and mesenchymal movement. CONCLUSION: These results suggest that the interaction of HAb18G/CD147 with annexin II is involved in the interconversion between mesenchymal and amoeboid movement of hepatocellular carcinoma cells.

Asunto(s)

Anexina A2/metabolismo , Basigina/fisiología , Carcinoma Hepatocelular/fisiopatología , Movimiento Celular/inmunología , Neoplasias Hepáticas/fisiopatología , Transducción de Señal/fisiología , Proteína de Unión al GTP rac1/fisiología , Proteína de Unión al GTP rhoA/fisiología , Carcinoma Hepatocelular/inmunología , Carcinoma Hepatocelular/patología , Línea Celular Tumoral , Humanos , Neoplasias Hepáticas/inmunología , Neoplasias Hepáticas/patología , Fosforilación , Transducción de Señal/efectos de los fármacos , Proteína de Unión al GTP rac1/metabolismo , Proteína de Unión al GTP rhoA/metabolismo

RESUMEN

ßig-h3 is a TGF-ß (transforming growth factor ß)-induced ECM (extracellular matrix) protein that induces the secretion of MMPs (matrix metalloproteinases). However, the mechanism of induction is yet to be established. In this study, siRNAs (small interfering RNAs) targeted against ßig-h3 were transfected into SMMC-7721 cells [a HCC (human hepatocellular carcinoma) cell line] to knockdown the expression of ßig-h3. We found that NiCl2, a potent blocker of extracellular Ca2+ entry, reduced ßig-h3-induced secretion of MMP-2 and -9. Further investigation suggested that reduction in the levels of ßig-h3 decreased the secretion of MMP-2 and -9 that was enhanced by an increase in the concentration of extracellular Ca2+. SNAP (S-nitroso-N-acetylpenicillamine), a NO (nitric oxide) donor, and 8-Br-cGMP (8-bromo-cGMP) inhibited thapsigargin-induced Ca2+ entry and MMP secretion in the invasive potential of human SMMC-7721 cells. Further, the inhibitory effects of 8-Br-cGMP and SNAP could be significantly enhanced by down-regulating ßig-h3. ßig-h3 attenuates the negative regulation of NO/cGMP-sensitive store-operated Ca2+ entry. Our findings suggest that the expression of ßig-h3 might play an important role in the regulation of store-operated Ca2+ entry to increase the invasive potential of HCC cells.

Asunto(s)

Calcio/metabolismo , Carcinoma Hepatocelular/metabolismo , Proteínas de la Matriz Extracelular/genética , Proteínas de la Matriz Extracelular/metabolismo , Neoplasias Hepáticas/metabolismo , Factor de Crecimiento Transformador beta/genética , Factor de Crecimiento Transformador beta/metabolismo , Carcinoma Hepatocelular/genética , Carcinoma Hepatocelular/patología , Línea Celular Tumoral , GMP Cíclico/análogos & derivados , GMP Cíclico/farmacología , Técnica del Anticuerpo Fluorescente , Humanos , Neoplasias Hepáticas/genética , Neoplasias Hepáticas/patología , Metaloproteinasa 2 de la Matriz/metabolismo , Metaloproteinasa 9 de la Matriz/metabolismo , Invasividad Neoplásica , Níquel/farmacología , Interferencia de ARN , ARN Interferente Pequeño , Reacción en Cadena de la Polimerasa de Transcriptasa Inversa , S-Nitroso-N-Acetilpenicilamina/metabolismo , Tapsigargina/farmacología , Transfección

RESUMEN

BACKGROUND: Enhanced and prolonged expression of connective tissue growth factor (CTGF) is associated with kidney fibrosis. Parathyroid hormone (PTH) is involved in the genesis of disturbed calcium/phosphate metabolism and ostitis fibrosa in renal failure. PTH activated mitogen-activated protein kinase (MAPK) signaling pathway is present in renal tubular cells. The aim of this study was to identify the mechanism how the signal is transduced to result in extracellular signal-regulated protein kinase (ERK) activation, leading to upregulation of CTGF. METHODS: The levels of CTGF mRNA and protein in human kidney proximal tubular cells (HK-2) treated with PTH in the presence or absence of the MAPK inhibitor PD98059 were analyzed by quantitative real-time polymerase chain reaction (RT-PCR) and immunoblotting assay. The activation of the CTGF promoter in HK-2 cells was determined by the dual-luciferase assay. The effects of the protein kinase A (PKA) activator 8-Br-cAMP and protein kinase C (PKC) activator phorbol 12-myristate 13-acetate (PMA) on MAPK phosphorylation, and the effects of the PKA inhibitor H89 and PKC inhibitor calphostin C on MAPK phosphorylation and CTGF expression were detected by immunoblotting assay. RESULTS: PD98059 inhibited the PTH stimulated expression of CTGF, which strongly suggested that the MAPK signaling pathway plays an important role in the PTH-induced CTGF upregulation in renal tubular cells. A PKA activator as well as PKC activators induced MAPK phosphorylation, and both PKA and PKC inhibitors antagonized PTH-induced MAPK phosphorylation and CTGF expression. CONCLUSION: CTGF expression is upregulated by PTH through a PKC/PKA-ERK-dependent pathway.

Asunto(s)

Factor de Crecimiento del Tejido Conjuntivo/fisiología , Túbulos Renales Proximales/patología , Proteínas Quinasas Activadas por Mitógenos/fisiología , Hormona Paratiroidea/farmacología , Células Cultivadas , Factor de Crecimiento del Tejido Conjuntivo/genética , Proteínas Quinasas Dependientes de AMP Cíclico/fisiología , Quinasas MAP Reguladas por Señal Extracelular/fisiología , Fibrosis , Flavonoides/farmacología , Humanos , Túbulos Renales Proximales/metabolismo , Sistema de Señalización de MAP Quinasas , Fosforilación , Proteína Quinasa C/fisiología

RESUMEN

OBJECTIVE: To investigate the clinical and pathological characteristics of patients with clinically presumed hypertensive nephrosclerosis (HN). METHODS: Clinical data and renal biopsy results were obtained in 63 patients diagnosed clinically as HN (primary hypertension plus renal injury). RESULTS: HN was confirmed by biopsy in 47 out of 63 patients (74.6%, 12 malignant nephrosclerosis and 35 benign nephrosclerosis). Primary nephritis (PN) was diagnosed by biopsy in 10 patients (7 IgA nephropathy, 2 mesangial proliferative nephritis, 1 chronic interstitial nephritis) and focal and segmental glomerulosclerosis (FSGS) in 6 patients. Blood pressure, body mass index, GFR and blood lipids were similar among groups. HN patients were related to higher age, more frequent family history of hypertension, longer hypertension duration, higher left ventricular mass index, lower serum creatinine and lower incidence of microscopic hematuria. Most patients with malignant nephrosclerosis and FSGS patients showed grades III and IV retinopathy. CONCLUSION: Our results show that HN was misdiagnosed in nearly 25% patients in this cohort. Since the clinical features are similar between HN, PN and FSGS, renal biopsy is needed to establish the diagnosis of HN.

Asunto(s)

Hipertensión Renal/patología , Riñón/patología , Nefroesclerosis/patología , Adulto , Anciano , Femenino , Humanos , Hipertensión Renal/complicaciones , Hipertensión Renal/diagnóstico , Masculino , Persona de Mediana Edad , Nefroesclerosis/diagnóstico , Nefroesclerosis/etiología

RESUMEN

OBJECTIVE: To identify the risk factors associated with cardiovascular disease (CVD) in Chinese chronic kidney disease (CKD) patients. METHODS: As part of a multicenter Chinese cohort study, the clinical data associated with CVD of 1239 patients with CKD (stage 2 - 5) hospitalized in 7 grade 3A hospitals distributed in 5 regions of China 2002 - 2003 were collected. Logistic regression model was used to analyze the association between CVD and the demographic variables, lifestyle, medical history, medication, physical examination, and laboratory variables. RESULTS: (1) Increase of serum C-reactive protein (CRP, cut off > 10 mg/L) was an independent risk factor for development of coronary artery disease (CAD) (OR 2.13; 95% confidence interval [CI], 1.32 - 3.43). 21.5% of the patients in this group showed a value of CRP > 10 mg/L. (2) Being female, anemia, and systolic hypertension were the major determinants of the development of left ventricular hypertrophy (OR 2.99, CI 2.09 - 4.26; OR 2.66, CI 1.19 - 3.57; and OR 1.02, CI 1.00 to -1.02). 54.2% of the patients in this group had their systolic pressure controlled under 140mmHg, and only 15% of the patients in this group had their hemoglobin remain at the level >or= 110 g/L. (3) There was a significant interaction between the calcium-phosphate product and congestive heart failure (CHF) (OR 1.023, CI 1.01 - 1.03). 25.9% of the patients in this cohort had their calcium-phosphate product >or= 55. (4) Hypoalbuminemia (OR 6.01, CI 1.25 - 28.96) and diastolic hypertension (OR 1.05, CI 1.00 - 1.09) played major role in determining cerebrovascular accidents (CVA). In these cohort the prevalence of hypoalbuminemia was 37.3%. (5) Diabetes was associated with CAD (OR 2.34), CHF (OR 1.97), and CVA (OR 4.40), although its prevalence was lower in Chinese CKD patients (20%). Age was the risk factors of CAD (OR 1.04) and CVA (OR 1.22). Hypertension was associated with LVH (OR 1.016), CHF (OR 1.02), and CVA (OR 1.04). CONCLUSION: CKD is associated with nontraditional risk factors for the development of CVD, including chronic inflammation, malnutrition and calcium-phosphate disorders. Particular care must be taken to give optimal treatment for the most important CVD risk factors active in Chinese CKD patients, e.g. anemia and hypertension.

Asunto(s)

Enfermedades Cardiovasculares/epidemiología , Enfermedades Renales/epidemiología , Adulto , Anciano , China/epidemiología , Enfermedad Crónica , Estudios de Cohortes , Comorbilidad , Femenino , Humanos , Hipertensión/epidemiología , Hipertensión/terapia , Hipertrofia Ventricular Izquierda/epidemiología , Enfermedades Renales/terapia , Masculino , Persona de Mediana Edad , Diálisis Renal , Factores de Riesgo

RESUMEN

OBJECTIVE: Cardiovascular (CV) disease (CVD) is the single most important cause of death among Chinese dialysis patients, accounting for 51% of overall mortality. The study was performed to investigate the prevalence and the spectrum of CVD in Chinese chronic kidney disease (CKD) patients. METHODS: The multicenter Chinese cohort study examined 1239 CKD patients from 7 main medical centers (distributed in 5 regions of China) who were hospitalized between 2002 and 2003. RESULTS: (1) The most prevalent pathological form of CVD was left ventricular (LV) hypertrophy (LVH), accounting for 58.5% of total patients. The prevalence of coronary artery disease (CAD), congestive heart failure (CHF), and cerebrovascular accidents (CVA) was 16.5%, 27.7% and 5.6%, separately. (2) The cohort with minor renal dysfunction (stage 2-3) had higher prevalence of CAD (5.9%) and CVA (1.0%) compared with general population in the same regions. Up to 41.2% of minor CKD patients were complicated with LVH, and 13.8% of them had clinical evidence of CHF. The prevalence of CAD, LVH and CHF increased as glomerular filtration decline. (3) The prevalence of CAD (20.0%) was much lower and the prevalence of CVA (5.4%) was higher in Chinese dialysis patients than that in American dialysis population. There was significant geographical variations in CAD prevalence, but it was not different between genders. CONCLUSION: The CV risk is significantly increased in patients with CKD. Even minor CKD has a major impact on the CV risk. The prevalence of CAD in Chinese dialysis patients is markedly lower than that in American dialysis population.

Asunto(s)

Enfermedades Cardiovasculares/epidemiología , Hipertrofia Ventricular Izquierda/epidemiología , Fallo Renal Crónico/complicaciones , Adulto , Anciano , Enfermedades Cardiovasculares/complicaciones , Trastornos Cerebrovasculares/complicaciones , Trastornos Cerebrovasculares/epidemiología , China/epidemiología , Estudios de Cohortes , Enfermedad Coronaria/complicaciones , Enfermedad Coronaria/epidemiología , Femenino , Insuficiencia Cardíaca/complicaciones , Insuficiencia Cardíaca/epidemiología , Humanos , Hipertrofia Ventricular Izquierda/complicaciones , Fallo Renal Crónico/epidemiología , Fallo Renal Crónico/terapia , Masculino , Persona de Mediana Edad , Prevalencia , Estudios Prospectivos , Diálisis Renal , Factores de Riesgo