RESUMEN
OBJECTIVE: Protective effect of thymoquinone (TQ) against the cytotoxic and genotoxic effects of cyclophosphamide (CP) was assessed in human peripheral blood lymphocyte culture. METHODS: Mitotic indices were determined as endpoints of cytotoxicity, while sister chromatid exchanges (SCE) served as endpoints of genotoxicity. Firstly, the genotoxic effect of 0.16 µg/ml of CP was tested and CP was detected as genotoxic. In the second set, CP group was treated with 20 µM and 40 µM TQ. RESULTS: TQ reduced the SCE frequencies, suggesting its protective action on human lymphocytes in vitro against the CP induced genotoxic damage. CONCLUSIONS: Our results suggest that TQ produces a protective mechanism against CP-induced genetic damage, and suggest a role of DNA strand breaks in the genotoxicity (Tab. 1, Fig. 1, Ref. 19).
Asunto(s)
Benzoquinonas/farmacología , Ciclofosfamida/toxicidad , Intercambio de Cromátides Hermanas/efectos de los fármacos , Células Cultivadas , Aberraciones Cromosómicas/inducido químicamente , Daño del ADN/efectos de los fármacos , Humanos , Linfocitos T/efectos de los fármacosRESUMEN
Partial trisomy of chromosome 5 was first described by Lejeune et al. in 1964 on the short arm (12). The vast majority of the partial trisomy 5 cases include 5p duplications; however we reported a small supernumerary marker chromosome. General symptoms include developmental delay, mental retardation, seizures, respiratory difficulties, congenital heart defects, abdominal muscle hypoplasia and dysmorphic features such as macrocephaly, enlarged anterior fontanelle, dolichocephaly, upslanting palpebral fissures, epicanthal folds, hypertelorism, abnormal ears, midface hypoplasia, short nose, broad nasal bridge and microretrognathia. Arachnodactyly and club foot may be seen as cytoskeletal abnormalities and, hypotonia may be determined in neurological exam. Here we reported a case with developmental delay, attention deficit hyperactivity disorder, mild mental retardation and dysmorphic features, caused by a new small supernumerary marker chromosome, generating partial trisomy 5pI 2-q 11.2. To our knowledge, this small supernumerary marker chromosome has not been reported before. Severe type of partial trisomy 5 includes seizures, congenital heart defects, hypotonia and failure to thrive. Previously reported partial trisomy 5 cases, who showed severe phenotype, had usually duplicated 5p13 region. Therefore, patients, who do not have duplicated 5p13, showed mild phenotype. Also, duplication of the long arm of chromosome 5, may contribute to the milder phenotype and the longer survival in partial trisomy 5 patients. Attention deficit hyperactivity disorder, which we described in the present case, may be a result of partial trisomy 5, because it includes ADHD4 gene. This case may help better understanding the karyotype/phenotype correlation related to partial trisomy 5.
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Trastorno por Déficit de Atención con Hiperactividad/genética , Aberraciones Cromosómicas , Cromosomas Humanos Par 5/genética , Marcadores Genéticos/genética , Trisomía/genética , Trastorno por Déficit de Atención con Hiperactividad/diagnóstico , Niño , Bandeo Cromosómico , Hibridación Genómica Comparativa , Discapacidades del Desarrollo/diagnóstico , Discapacidades del Desarrollo/genética , Humanos , Hibridación Fluorescente in Situ , Cariotipificación , MasculinoRESUMEN
Paraffin embedded tissue sections and fine needle aspiration biopsy (FNAB) are important methods for diagnosis. We compared thyroid tissue obtained by FNAB to paraffin embedded sections to determine whether there were differences in detection of the amounts of argyrophilic nucleolar organizing region (AgNOR) proteins. Twenty-two patients with papillary thyroid carcinoma were included in the study. Slides were prepared with both FNAB tissue and 3 µm sections of paraffin embedded tissue, and stained for AgNOR. One hundred nuclei per individual were evaluated; total AgNOR number/nucleus (TAn/TNn) and total AgNOR area/nuclear area (TAa/TNa) of individual cells were determined. Mean TAn/TNn and TAa/TNa values were 4.800 ± 1.118 and 13.382 ± 2.612, respectively, for FNAB samples; corresponding values were 2.406 ± 0.649 and 8.49 ± 0.893, respectively, for paraffin embedded sections. The differences between FNAB materials and paraffin embedded tissue sections were significant for the mean TAn/TNn and TAa/TNa values. Significant differences in the amounts of AgNOR protein detected were found between FNAB and paraffin embedded tissue sections.
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Antígenos Nucleares/metabolismo , Carcinoma/patología , Neoplasias de la Tiroides/patología , Biopsia con Aguja Fina/métodos , Carcinoma Papilar , Núcleo Celular/patología , Humanos , Adhesión en Parafina/métodos , Cáncer Papilar TiroideoRESUMEN
Warburg Micro Syndrome (WARBM, MIM 600118) is a rare, severe autosomal recessive neurodevelopmental disorder characterized by microcephaly, microphthalmia, microcornea, congenital cataract, cortical dysplasia, corpus callosum hypoplasia, intellectual disability, hypotonia and hypogonadism. RABS, small G proteins belonging to the RAS superfamily, are master regulators of vesicle trafficking in the cell. The identification of mutations in the RAB3GAP1 and RAB3GAP2 genes, which together encode the RAB3GTPase-activating protein, a key regulator in calcium-mediated exocytosis of neurotransmitters and hormones, has underpinned abnormal development of the brain, eye and genitalia as cardinal features of this syndrome. More than 100 patients have been reported with WARBM, with mutations in the RABGAP1, RABGAP2, RAB18 and TBC1D20 genes. The objective of the study was to describe the recurrent RAB3GAP1 mutations and compare the clinical features of the patients with WARBM in the Turkish population. Here we report two brothers with Warburg Micro Syndrome 1 from a non-consanguineous Turkish family with clinical features similar to those previously reported in Turkish patients with RAB3GAP1 mutations. We found that the c.748+1G>A splice-site mutation in RAB3GAP1 intron 8 is common and has so far only been detected in patients of Turkish ethnic origin. Although one of our patients has a distal extra crease on the 4th finger and another has nephrolithiasis, there does not appear to be any specific phenotypic findings associated with this mutation.
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Anomalías Múltiples/diagnóstico , Anomalías Múltiples/genética , Catarata/congénito , Córnea/anomalías , Hipogonadismo/diagnóstico , Hipogonadismo/genética , Discapacidad Intelectual/diagnóstico , Discapacidad Intelectual/genética , Microcefalia/diagnóstico , Microcefalia/genética , Atrofia Óptica/diagnóstico , Atrofia Óptica/genética , Proteínas de Unión al GTP rab3/genética , Encéfalo/patología , Catarata/diagnóstico , Catarata/genética , Humanos , Lactante , Imagen por Resonancia Magnética , Masculino , Mutación , TurquíaRESUMEN
BACKGROUND: Urinary bladder cancer is a quite common cancer type in men and women all over the world. Genetic polymorphisms of xenobiotic-metabolizing enzymes could increase individual susceptibility to various cancer types. AIMS: The aim of our study is to evaluate the rate of these polymorphisms in a group of patients from Central Anatolia. METHODS: Our study subjects consist of 65 men with histopathologically confirmed bladder TCC and 70 cancer-free control subjects. Restriction fragment length polymorphism (RFLP) method was used for the detection of polymorphisms of GSTT1 and GSTM1. RESULTS: There was no association between bladder cancer and GSTM1 polymorphism (ORs = 0.64, 95% CI = 0.32-1.29), but the probability of bladder cancer in patients with GSTT1 null genotype (67.9%), was significantly higher from the probability of bladder cancer with GSTT1 normal genotype (43.0%) statistically (ORs = 2.8, 95% CI = 1.16-6.75). CONCLUSION: Polymorphisms of these genes have been assessed to evaluate the relative risk of various cancers. Our intention is to continue this study with larger series of bladder cancer patients in a group of Turkish population from Central Anatolia.
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Glutatión Transferasa/genética , Neoplasias de la Vejiga Urinaria/genética , Anciano , Estudios de Casos y Controles , Femenino , Genotipo , Humanos , Masculino , Persona de Mediana Edad , Polimorfismo Genético , Turquía/epidemiología , Neoplasias de la Vejiga Urinaria/epidemiología , Neoplasias de la Vejiga Urinaria/patologíaRESUMEN
OBJECTIVE: The incidence of urinary bladder disturbances and renal structural changes and functional decline are found to increase with age. METHODS: We investigated the effect of melatonin treatment in addition to estrogen replacement therapy in pinealectomized (Px) and ovariectomized (Ovx) rats. 56 female Wistar rats were divided into seven groups, each containing eight animals: Sham, (Ovx), (Px), Px+Ovx, Px+Ovx receiving estrogen (Px+Ovx+E), Px+Ovx receiving melatonin (Px+Ovx+M) and Px+Ovx estrogen and melatonin supplemented (Px+Ovx+EM) group (EM group). We evaluated reduced glutathione (GSH) levels and malondialdehyde (MDA) levels. The mean collagen fiber (CF)/smooth muscle (SM) ratio in the bladder wall and structure of the kidney were examined histolologically. We also recorded response of the bladder contractility to acetylcholine (Ach). RESULTS: Px and Ovx groups showed statistically significant reductions of antioxidant defenses, impaired Ach-evoked contraction, histological changes compared with the control group. Also, these changes were prominent in Px+Ovx group compared with all other groups. Both estrogen and melatonin reversed these changes however best restoration was observed in the EM group. CONCLUSIONS: Px performed in addition to Ovx led to a distinct increase in oxidative damage in bladder and renal tissue and deteriorate of the detrussor function. Either estradiol or melatonin replacement alone or in combination prevents significant alterations of tissue histology and bladder contractility following Ovx and Px. Thus, combination treatment appears to be the best method to restore both contractility and histomorphology of bladder and kidney tissues after Ovx and Px (Tab. 3, Fig. 4, Ref. 44).
Asunto(s)
Terapia de Reemplazo de Estrógeno , Riñón/efectos de los fármacos , Melatonina/farmacología , Ovariectomía , Glándula Pineal/cirugía , Vejiga Urinaria/efectos de los fármacos , Animales , Antioxidantes/farmacología , Femenino , Riñón/patología , Contracción Muscular/efectos de los fármacos , Contracción Muscular/fisiología , Ratas , Ratas Wistar , Vejiga Urinaria/patología , Vejiga Urinaria/fisiopatologíaRESUMEN
OBJECTIVE: To investigate the relation between recurrent pregnancy loss (RPL) and factor V Leiden, prothrombin G20210A, and C677T methylenetetrahydrofolate reductase (MTHFR) mutations. MATERIALS AND METHODS: A case-control study was conducted on 95 consecutive cases with RPL, and 40 age-matched controls who had no history of pregnancy loss and had at least one successful pregnancy. After application of exclusion criteria, 60 patients in the study group and 40 control cases were compared for thrombophilic factors. RESULTS: Thirteen out of 60 RPL cases and one out of 40 in the control group were carriers of factor V Leiden mutation. While six patients were carriers of prothrombin G20210A gene mutation, none in the control group carried this mutation. Twenty-nine out of 60 RPL cases and 17 out of 40 control cases had MTHFR mutation. CONCLUSION: The authors found a positive correlation between RPL and FVL and FII gene mutations, but no significant association between RPL and MTHFR gene mutation.
Asunto(s)
Aborto Habitual/genética , Trombofilia/genética , Adulto , Estudios de Casos y Controles , Factor V/genética , Femenino , Humanos , Metilenotetrahidrofolato Reductasa (NADPH2)/genética , Persona de Mediana Edad , Mutación , Embarazo , Protrombina/genética , Turquía , Adulto JovenRESUMEN
We present a male child at 3 years old with Anophthalmia-Plus Syndrome (APS). He has asymmetry of the face and head, left choanal atresia, a sunken facial appearance, microphthalmia in the right eye, severe microphthalmia in the left eye, bilateral low-set ears, scarring from cleft palate surgery. Magnetic resonance imaging (MRI) sections revealed decreased right globe volume, an undeveloped left globe, decreased left optical nerve thickness, Chiari type 2 malformation, left choanal atresia and cleft palate. Echocardiography and abdominal ultrasonography were normal. The patient has a 45 dB conductive hearing loss in the left ear. Repeated thyroid function tests were evaluated as compatible with central hypothyroidism. We report a Fryns Anophthalmia-Plus Syndrome in a child with unusual findings including central hypothyroidism, chiari type 2 malformation, conductive hearing loss and developmental regression. Summary of the features reported in the present case and all 14 previous cases that might be defined as APS.
Asunto(s)
Anomalías Múltiples/diagnóstico , Anoftalmos/diagnóstico , Malformación de Arnold-Chiari/diagnóstico , Discapacidades del Desarrollo/diagnóstico , Pérdida Auditiva Conductiva/diagnóstico , Hipotiroidismo/diagnóstico , Preescolar , Humanos , Hipotiroidismo/tratamiento farmacológico , Masculino , Tiroxina/uso terapéuticoRESUMEN
OBJECTIVES: The aim of the study was to investigate the effect of ozone on oxidative/nitrosative stress and bladder injury caused by Escherichia coli in rat bladder. METHODS: Twenty-one Wistar-Albino-type female rats included in the study were divided into three groups of equal number: (1) sham operation (control), (2) E. coli-only (EC), (3) EC + ozone. After ozone therapy for 3 days, urine and tissue samples were obtained for biochemical, microbiological, and histopathological analysis. RESULTS: Tissue malondialdehyde (MDA), myeloperoxidase (MPO), and nitric oxide (NO) level were increased, whereas superoxide dismutase (SOD) and glutathione peroxidase (GPx) activity was decreased in the EC group. MDA, MPO, and NO levels were decreased, whereas SOD, GPx activity was increased in the ozone-treated group. Also, there was no bacterial translocation in this group. CONCLUSION: The results of the present study suggest that ozone may be used as an agent to protect the bladder from oxidative/nitrosative stress occurring in cystitis.
Asunto(s)
Antibacterianos/farmacología , Cistitis/tratamiento farmacológico , Infecciones por Escherichia coli/tratamiento farmacológico , Ozono/farmacología , Vejiga Urinaria/efectos de los fármacos , Infecciones Urinarias/tratamiento farmacológico , Animales , Traslocación Bacteriana/efectos de los fármacos , Cistitis/microbiología , Modelos Animales de Enfermedad , Escherichia coli/efectos de los fármacos , Infecciones por Escherichia coli/microbiología , Femenino , Glutatión Peroxidasa/metabolismo , Malondialdehído/metabolismo , Óxido Nítrico/metabolismo , Estrés Oxidativo/efectos de los fármacos , Peroxidasa/metabolismo , Ratas , Ratas Wistar , Superóxido Dismutasa/metabolismo , Vejiga Urinaria/microbiología , Infecciones Urinarias/microbiologíaRESUMEN
BACKGROUND: It is generally agreed that physiological levels of melatonin, a hormone secreted by the pineal gland, are important in protecting against oxidative stress-induced tissue damage. AIM: We investigated the effects that pinealectomy and the administration of exogenous melatonin have on the brains, testes, duodena and stomachs of rats. MATERIALS AND METHODS: Pinealectomized (Px) and sham-operated (non-Px) rats were used. We evaluated structural changes, and catalase (CAT), reduced glutathione (GSH), super oxide dismutase (SOD) and malondialdehyde (MDA) levels. The rats were divided into the following five groups (eight rats in each group): sham (non-Px), Px+ vehicle, Px+ melatonin (10 mg/kg given daily intraperitoneally for a week), melatonin and ethyl alcohol. RESULTS: The antioxidant levels in the tissue of Px rats were significantly lower than in those of the sham group. Administering melatonin significantly increased antioxidant levels (p < 0.05). The Px rats also showed a significant increase in MDA levels when compared to the sham group, and administering melatonin to the Px rats significantly reduced their MDA levels (p < 0.05). The severity of caspase-3 staining was lower in the Px+ melatonin group than in the Px+vehicle group. CONCLUSIONS: These findings suggest that significantly more oxidative and structural changes occur in rats' brains, spinal cords and testes after pinealectomy, but that this can be diminished by melatonin treatment. However, Px does not have important effects on the duodenum and stomach.
Asunto(s)
Antioxidantes/administración & dosificación , Encéfalo/efectos de los fármacos , Duodeno/efectos de los fármacos , Melatonina/administración & dosificación , Glándula Pineal/cirugía , Estómago/efectos de los fármacos , Testículo/efectos de los fármacos , Animales , Apoptosis/efectos de los fármacos , Encéfalo/metabolismo , Encéfalo/patología , Caspasa 3/metabolismo , Catalasa/metabolismo , Citoprotección , Duodeno/metabolismo , Duodeno/patología , Mucosa Gástrica/metabolismo , Glutatión/metabolismo , Inyecciones Intraperitoneales , Masculino , Malondialdehído/metabolismo , Melatonina/metabolismo , Estrés Oxidativo/efectos de los fármacos , Glándula Pineal/metabolismo , Ratas , Ratas Wistar , Estómago/patología , Superóxido Dismutasa/metabolismo , Testículo/metabolismo , Testículo/patología , Factores de TiempoRESUMEN
Argyrophilic nucleolar organizing region associated proteins (AgNORs) play roles in cell proliferation and a variety of diseases. We attempted to determine whether decreased NOR protein synthesis causes human hair loss. We studied 21 healthy males who suffered hair loss on the frontal/vertex portion of the head. Hair root cells from normal and hair loss sites were stained for AgNOR. One hundred nuclei per site were evaluated and the AgNOR number and NORa/TNa proportions of individual cells were determined using a computer program. The cells from normal sites had significantly higher AgNOR counts than those from hair loss sites. Also, the cells from the normal sites had significantly higher NORa/TNa than cells from the hair loss sites. In the normal sites, the cells demonstrated more NOR protein synthesis than cells in hair loss sites. Therefore, decreased NOR protein synthesis appears to be related to hair loss in humans.
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Alopecia/metabolismo , Antígenos Nucleares/biosíntesis , Cabello/metabolismo , Adulto , Anciano , Antígenos Nucleares/análisis , Cabello/química , Humanos , Masculino , Persona de Mediana Edad , Región Organizadora del Nucléolo/metabolismo , Tinción con Nitrato de Plata , Adulto JovenRESUMEN
The aim of this study was to investigate the possible effects of ivabradine against doxorubicin (DOX)-induced cardiotoxicity in rats using hemodynamic parameters (electrocardiogram, heart rate (HR), and blood pressure), biochemical markers of oxidative stress, lactate dehydrogenase, aspartate transaminase, creatine kinase-MB, and histopathological analyses both in serum and tissue specimens. A total of 28 female rats were randomly assigned to 4 groups: (a) control (n = 6 rats), (b) DOX group (n = 7 rats), (c) DOX + ivabradine-treated group (n = 8 rats), and (d) ivabradine group (n = 7 rats). When the means of the four groups were compared, there was only a significant difference in the level of HR (p < 0.05). DOX treatment caused more HR elevation when compared to the control group, whereas ivabradine application after DOX treatment significantly reduced HR levels. Cardiomyocytes were revealed as normal histology in the light of both hematoxylin and eosin staining and immunostaining methods (caspase-3 and bcl-2) in all groups. The present study reported the therapeutic effects of ivabradine against DOX-induced cardiotoxicity accompanied by the hemodynamic and biochemical parameters.
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Antibióticos Antineoplásicos/toxicidad , Benzazepinas/uso terapéutico , Cardiotónicos/uso terapéutico , Doxorrubicina/toxicidad , Cardiopatías/tratamiento farmacológico , Animales , Aspartato Aminotransferasas/sangre , Benzazepinas/farmacología , Presión Sanguínea/efectos de los fármacos , Cardiotónicos/farmacología , Catalasa/metabolismo , Creatina Quinasa/sangre , Femenino , Glutatión Peroxidasa/metabolismo , Corazón/efectos de los fármacos , Corazón/fisiología , Cardiopatías/inducido químicamente , Cardiopatías/metabolismo , Cardiopatías/fisiopatología , Frecuencia Cardíaca/efectos de los fármacos , Ivabradina , L-Lactato Deshidrogenasa/sangre , Miocardio/metabolismo , Estrés Oxidativo/efectos de los fármacos , Ratas , Ratas Wistar , Superóxido Dismutasa/metabolismo , Sustancias Reactivas al Ácido Tiobarbitúrico/metabolismoRESUMEN
OBJECTIVE: The effects of electromagnetic radiation (EMR) produced by a third-generation (3G) mobile phone (MP) on rat brain tissues were investigated in terms of magnetic resonance spectroscopy (MRS), biochemistry, and histopathological evaluations. METHODS: The rats were randomly assigned to two groups: Group 1 is composed of 3G-EMR-exposed rats (n = 9) and Group 2 is the control group (n = 9). The first group was subjected to EMR for 20 days. The control group was not exposed to EMR. Choline (Cho), creatinin (Cr), and N-acetylaspartate (NAA) levels were evaluated by MRS. Catalase (CAT) and glutathione peroxidase (GSH-Px) enzyme activities were measured by spectrophotometric method. Histopathological analyses were carried out to evaluate apoptosis in the brain tissues of both groups. RESULTS: In MRS, NAA/Cr, Cho/Cr, and NAA/Cho ratios were not significantly different between Groups 1 and 2. Neither the oxidative stress parameters, CAT and GSH-Px, nor the number of apoptotic cells were significantly different between Groups 1 and 2. CONCLUSIONS: Usage of short-term 3G MP does not seem to have a harmful effect on rat brain tissue.
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Encéfalo/efectos de la radiación , Teléfono Celular , Radiación Electromagnética , Animales , Apoptosis/efectos de los fármacos , Ácido Aspártico/análogos & derivados , Ácido Aspártico/metabolismo , Encéfalo/anatomía & histología , Encéfalo/metabolismo , Catalasa/metabolismo , Colina/metabolismo , Creatinina/metabolismo , Glutatión Peroxidasa/metabolismo , Espectroscopía de Resonancia Magnética , Masculino , Neuronas/citología , Neuronas/efectos de la radiación , Ratas , Ratas WistarRESUMEN
We aimed to compare the accuracy of transvaginal sonography (TVS), saline infusion sonohysterography (SIS) and hysteroscopy (HS) for uterine pathologies among infertile women. A total of 346 patients were selected for operative hysteroscopy, following SIS after TVS. SIS was performed with a Cook Soft 500 IVF catheter. Sensitivity, specificity, positive and negative predictive values (PPV, NPV) were calculated to compare the accuracy of TVS, SIS and hysteroscopy for uterine abnormalities. SIS showed a sensitivity of 87%, specificity of 100% and PPV of 100% for endometrial hyperplasia, and a sensitivity and NPV of 100% for polypoid lesions. For submucosal myoma SIS showed a sensitivity of 99% with PPV of 96%. Hysteroscopy had a sensitivity, specificity, PPV and NPV of 98%, 83%, 96% and 91%, respectively for overall uterine pathologies. Finally, SIS seems to be superior to TVS, for uterine pathologies, with respect to hysteroscopy as the gold standard.
Asunto(s)
Histeroscopía/normas , Infertilidad Femenina/diagnóstico por imagen , Infertilidad Femenina/patología , Ultrasonografía/normas , Adulto , Biopsia , Femenino , Humanos , Histeroscopía/métodos , Leiomioma/diagnóstico por imagen , Leiomioma/patología , Menorragia/diagnóstico por imagen , Menorragia/patología , Pólipos/diagnóstico por imagen , Pólipos/patología , Valor Predictivo de las Pruebas , Embarazo , Estándares de Referencia , Reproducibilidad de los Resultados , Sensibilidad y Especificidad , Cloruro de Sodio , Ultrasonografía/métodos , Enfermedades Uterinas/diagnóstico por imagen , Enfermedades Uterinas/patología , Neoplasias Uterinas/diagnóstico por imagen , Neoplasias Uterinas/patología , VaginaRESUMEN
AIMS: The purpose of this study was to investigate the effects of chronic administration of melatonin on renal ischemia/reperfusion (IR) injury in streptozotocin (STZ)-induced diabetic rats. METHODOLOGY: Male Sprague-Dawley rats were divided into six groups: control (C), diabetes mellitus (DM), control+IR (C+IR), DM+IR, Melatonin+IR (Mel+IR), DM+Mel+IR. Diabetic and non-diabetic rats were given melatonin 4 mg/kg/day, i.p., for 15 days. The left renal artery and vein of rats were occluded for 30 min at the 18th day, followed by 24 h of reperfusion. RESULTS: In comparison with control group, the levels of malondialdehyde (MDA), protein carbonyl (PC) and and nitric oxide (NO) were determined to be higher in the renal homogenates of DM, DM+IR and C+IR groups. MDA and NO levels were found to be similar in the DM+melatonin+IR and control groups. The most significant histological damage was found in the DM+IR group and this damage was significantly reduced by melatonin. CONCLUSION: Chronic melatonin treatment reduces renal injury by reducing lipid oxidation and NO production in STZ-induced diabetic rats exposed to IR.
Asunto(s)
Antioxidantes/farmacología , Diabetes Mellitus Experimental , Enfermedades Renales/prevención & control , Melatonina/farmacología , Daño por Reperfusión/prevención & control , Animales , Diabetes Mellitus Experimental/sangre , Diabetes Mellitus Experimental/patología , Enfermedades Renales/sangre , Enfermedades Renales/patología , Peroxidación de Lípido/efectos de los fármacos , Masculino , Malondialdehído/sangre , Óxido Nítrico/sangre , Ratas , Ratas Sprague-Dawley , Daño por Reperfusión/sangre , Daño por Reperfusión/patologíaRESUMEN
Despite their beneficial effects, aminoglycosides including gentamicin (GEN) have considerable nephrotoxic side-effects. The toxicity of GEN at the level of the kidney seems to relate to the generation of reactive oxygen species (ROS). ROS have been reported to be involved in the activation of protein kinase C (PKC). The unique structural aspects of PKC cause it to function as a sensor for oxidative stress. It seems likely that the increased NAD(P)H oxidase-derived superoxide (O2) production is at least in part mediated by PKC. We investigated the effects of chelerythrine, a commonly used PKC inhibitor, on GEN-induced changes of renal malondialdehyde (MDA), nitric oxide (NO) generation, catalase (CAT), superoxide dismutase (SOD), glutathione peroxidase (GSH-Px) activities, glutathione (GSH) content, and serum creatinine (Cr), blood urea nitrogen (BUN) levels. Morphological changes in the kidney were also examined. GEN administration to control rats increased MDA and NO generation but decreased CAT, SOD and GSH-Px activities, and GSH content. Chelerythrine administration with GEN caused significantly decreased MDA, NO generation and increased CAT, SOD and GSH-Px activities, and GSH content when compared with GEN alone. Chelerythrine also significantly decreased serum Cr and BUN levels. Morphological changes in the kidney including tubular necrosis were evaluated qualitatively. Both biochemical findings and histopathological evidence showed that administration of chelerythrine reduced the GEN-induced kidney damage. We propose that chelerythrine acts in the kidney as a potent scavenger of free radicals to prevent the toxic effects of GEN via the inhibition of a PKC pathway.