RESUMEN
To enable precise detection of mental and physical states of users in a daily life, we have been developing an eyewear to measure eye and body movement in a unrestricted way. The horizontal and vertical EOG (electrooculogram) signals are measured and amplified with three metal dry electrodes placed near nasion and both sides of rhinion, of which positions correspond to the bridge and nose pads of eyewear, respectively. The user's mental states like drowsiness, sleepiness, fatigue, or interest to objects can be identified by the movements and blinking of the eyes extracted from the measured EOG. And the six-axis motion sensor (three-axis accelerometer and three-axis gyroscope) mounted in the eyewear measures the body motion. As the sensor located near the head is on the body axis, this eyewear is suitable to measure user's movement or shift of center of gravity during physical exercise with a high precision. The measured signals are used to extract various events of eye and body movement by the mounted microcontroller chip, or can be transmitted to the external devices via Bluetooth communication. This device can enable you to look into "yourself", as well as outer scenes. In this presentation, the outline of the eyewear is introduced and some possible applications are shown.
Asunto(s)
Electrooculografía , Movimientos Oculares/fisiología , Monitoreo Fisiológico , Movimiento/fisiología , Parpadeo , Electrooculografía/instrumentación , Electrooculografía/métodos , Humanos , Monitoreo Fisiológico/instrumentación , Monitoreo Fisiológico/métodos , Fases del SueñoRESUMEN
BACKGROUND: IL-13, a helper T cell type 2 (Th2) cytokine, transforms cultured airway epithelial cells to goblet cells, and this is not inhibited by corticosteroids. IL-33 stimulates Th2 cytokines and is highly expressed in airways of persons with asthma. The effect of IL-33 on goblet cell differentiation and cytokine secretion has not been described. OBJECTIVE: We examined the effect of IL-33 on CXCL8/IL-8 secretion from goblet or normally differentiated human bronchial epithelial (NHBE) cells and signalling pathways associated with IL-33 activation in these cells. METHODS: Normal human bronchial epithelial cells were grown to goblet or normally differentiated ciliated cell phenotype at air-liquid interface in the presence or absence of IL-13. After 14 days, differentiated cells were exposed to IL-33 for 24 h. RESULTS: CXCL8/IL-8 secretion into the apical (air) side of the goblet cells was greater than from normally differentiated cells (P < 0.01), and IL-33 stimulated apical CXCL8/IL-8 release from goblet cells, but not from normally differentiated cells (P < 0.01). IL-33 increased ERK 1/2 phosphorylation in goblet cells (P < 0.05), and PD98059, a MAPK/ERK kinase inhibitor, attenuated IL-33-stimulated CXCL8/IL-8 secretion from goblet cells (P < 0.001). IL-13 induced ST2 mRNA (P < 0.02) and membrane-bound ST2 protein expression on the apical side surface of goblet cells compared with normally differentiated cells, and neutralization with anti-ST2R antibody attenuated IL-33-induced apical CXCL8/IL-8 secretion from goblet cells (P < 0.02). CONCLUSIONS AND CLINICAL RELEVANCE: Goblet cells secrete CXCL8/IL-8, and this is increased by IL-33 through ST2R-ERK pathway, suggesting a mechanism for enhanced airway inflammation in the asthmatic airway with goblet cell metaplasia.
Asunto(s)
Células Caliciformes/efectos de los fármacos , Células Caliciformes/metabolismo , Interleucina-8/biosíntesis , Interleucinas/farmacología , Mucosa Respiratoria/citología , Mucosa Respiratoria/metabolismo , Diferenciación Celular/efectos de los fármacos , Expresión Génica , Células Caliciformes/citología , Humanos , Proteína 1 Similar al Receptor de Interleucina-1 , Interleucina-13/farmacología , Interleucina-33 , Proteína Quinasa 1 Activada por Mitógenos/metabolismo , Proteína Quinasa 3 Activada por Mitógenos/metabolismo , Compuestos Orgánicos/farmacología , Fosforilación , ARN Mensajero/genética , ARN Mensajero/metabolismo , Receptores de Superficie Celular/genética , Receptores de Superficie Celular/metabolismo , Mucosa Respiratoria/efectos de los fármacosRESUMEN
BACKGROUND: Glucocorticosteroids (GCS) are used to treat bronchial asthma, but are not uniformly effective, especially in severe asthma. IL-13 is a T helper type 2 cytokine implicated in the pathogenesis of asthma, and IL-13 induces mucus production and goblet cell hyperplasia in airway epithelial cells. The effect of GCS on IL-13-induced mucin production is not well characterized. OBJECTIVE: The aim of this study was to evaluate the effect of dexamethasone (Dex), a potent synthetic GCS, on IL-13-induced MUC5AC mucin expression and goblet cell proliferation in differentiated normal human bronchial epithelial cells (NHBECs). METHODS: NHBECs were cultured for 14 days at an air-liquid interface with IL-13, with or without Dex. MUC5AC protein secretion and mRNA expression was determined using ELISA and quantitative real-time PCR. IL-8 production was assayed using ELISA. Histochemical analysis was performed using H&E and periodic acid-Schiff stain, and MUC5AC immunostaining. RESULTS: Although Dex dose dependently inhibited IL-8 release induced by 5 ng/mL IL-13, Dex 0.001-1 µg/mL had no effect on IL-13 induced MUC5AC protein secretion or mRNA expression. Dex paradoxically increased MUC5AC induced by IL-13 at 0.5 and 1 ng/mL, but had no effect alone or with IL-13 at 0.1 ng/mL. Dex 0.001-1 µg/mL did not inhibit the differentiation of cells into goblet cells and MUC5AC-positive cells induced by IL-13. CONCLUSION AND CLINICAL RELEVANCE: Dex at therapeutic concentrations did not inhibit the effects of IL-13 on goblet cell differentiation, characteristic of severe asthma. Paradoxically, MUC5AC production was increased with lower dose IL-13 exposure. This may lead to airway mucus obstruction commonly seen in life-threatening asthma.
Asunto(s)
Diferenciación Celular/efectos de los fármacos , Dexametasona/farmacología , Células Caliciformes/citología , Células Caliciformes/efectos de los fármacos , Interleucina-13/farmacología , Mucina 5AC/biosíntesis , Mucosa Respiratoria/metabolismo , Células Cultivadas , Células Epiteliales/efectos de los fármacos , Células Epiteliales/inmunología , Células Epiteliales/metabolismo , Humanos , Interleucina-8/biosíntesis , Mucina 5AC/genética , ARN Mensajero/metabolismo , Mucosa Respiratoria/efectos de los fármacos , Mucosa Respiratoria/inmunología , Transcripción Genética/efectos de los fármacosRESUMEN
A P300-based BCI (brain-computer interface) system for controlling the movement of the cursor displayed on the computer screen was proposed and evaluated. On the LCD computer screen, the cursor was displayed with the surrounded eight small circles, each of which was blinked sequentially in a random order. Five healthy subjects were requested to gaze at one of the circles placed in the preferred direction. The P300 activities elicited by the random blink of the target circle were detected by pattern classifier and they were used to move the cursor to the same direction as the target circle. It was shown that all of the subjects could control the movement of the cursor to their preferred direction by moving their gaze point in a short distance. This system can be applied to the voluntary control of the movement of the computer cursor, and the navigation of robot or video camera, without using users' extremities.
Asunto(s)
Encéfalo/fisiología , Potenciales Relacionados con Evento P300/fisiología , Interfaz Usuario-Computador , Parpadeo , Computadores , Electroencefalografía/métodos , Diseño de Equipo , Movimientos Oculares , Humanos , Internet , Masculino , Reconocimiento de Normas Patrones Automatizadas , Reproducibilidad de los Resultados , Robótica , Dispositivos de Autoayuda , Grabación en Video , Visión OcularRESUMEN
Bronchoscopic treatment for emphysematous lung diseases has attracted clinical attention, and several different approaches are being investigated. We present a case of emphysematous bullae that was effectively treated with a newly developed bronchoscopic intervention, autologous blood injection. A 59-year-old man was referred to our institution with exertional dyspnoea. Chest CT showed emphysema and bullae with a diameter of 12 cm in the right upper lobe. Bronchoscopic treatment was introduced as an alternative to surgery. Autologous blood and fibrinogen solution were infused into bullae via the transbronchial catheter, under fluoroscopic guidance. Post-treatment CT showed marked contraction of bullae to a diameter of 3 cm, corresponding to a volume reduction of 800 ml on body plethysmography. A significant reduction in dyspnoea was also noted. This therapeutic approach is less invasive and may represent a good option for reducing lung volume.
Asunto(s)
Transfusión de Sangre Autóloga/métodos , Neumonectomía/métodos , Enfisema Pulmonar/terapia , Broncoscopía/métodos , Humanos , Inyecciones , Masculino , Persona de Mediana EdadRESUMEN
A 66 year old man had inhaled cotton fibre for 50 years at his workplace. He did not have any respiratory symptoms. Chest CT scans revealed diffuse centrilobular and peribronchovascular interstitial thickening. Lung biopsy specimens confirmed the presence of string-like foreign bodies as well as granulomas and fibrosis in the peribronchial region. Infrared spectrophotometry confirmed that the foreign bodies were composed of natural cellulose. This is the first study to show directly by examination of biopsy samples that cotton fibre inhalation can cause diffuse lung disease. The clinical features of the disease were entirely different from those of byssinosis.
Asunto(s)
Fibra de Algodón , Exposición por Inhalación/efectos adversos , Enfermedades Pulmonares Intersticiales/etiología , Anciano , Bisinosis/diagnóstico , Diagnóstico Diferencial , Humanos , Enfermedades Pulmonares Intersticiales/diagnóstico , MasculinoRESUMEN
T cells expressing CD57 (a natural killer cell marker) with interferon-gamma (IFN-gamma) producing capacity increase under various conditions. CD57+ T cells are also present in the bronchoalveolar lavage fluid (BALF) of sarcoidosis, and several phenotypical and functional analyses of these cells have been reported. In the present study, BALF T cells obtained from 52 patients with sarcoidosis were classified further into CD4+CD57+ T cells, CD4+CD57- T cells, CD8+CD57+ T cells and CD8+CD57- T cells and their phenotypes and functional characteristics were assessed. Substantial proportions of these T cell subsets expressed natural killer cell markers CD161 and CD122. The biased expansion of Vbeta2 T cells was observed in both CD4+CD57+ T cells and CD4+CD57- T cells in BALF from most patients, while the expansion of other Vbeta T cells was also observed in some patients. Unexpectedly, the biased expansion of certain Vbeta T cells was also seen in either CD8+CD57+ T cells or CD8+CD57- T cells, while the expanded Vbeta T cells in CD8+ T cells differed substantially among individuals. BALF T cells showed a remarkably lower T cell receptor (TCR) intensity than that of peripheral blood T cells. Both CD8+ T cell subsets in BALF of sarcoidosis expressed the intracellular perforin/granzyme B, while all four subsets expressed intracellular IFN-gamma after in vitro activation, and CD4+ T cells, especially CD4+CD57+ T cells, expressed tumour necrosis factor-alpha. These findings indicate that CD57+ T cells as well as CD57- T cells in the BALF are phenotypically and functionally different from peripheral blood T cells and may play an important role in the Th1 dominant state and inflammation in pulmonary sarcoidosis.
Asunto(s)
Antígenos CD/análisis , Líquido del Lavado Bronquioalveolar/inmunología , Sarcoidosis Pulmonar/inmunología , Subgrupos de Linfocitos T/inmunología , Antígenos de Superficie/análisis , Biomarcadores/análisis , Antígenos CD4/análisis , Antígenos CD57/análisis , Antígenos CD8/análisis , Granzimas , Humanos , Inmunofenotipificación/métodos , Interferón gamma/inmunología , Células Asesinas Naturales/inmunología , Lectinas Tipo C/análisis , Activación de Linfocitos , Recuento de Linfocitos , Subfamilia B de Receptores Similares a Lectina de Células NK , Receptores de Antígenos de Linfocitos T/análisis , Receptores de Interleucina-2/análisis , Serina Endopeptidasas/análisis , Factor de Necrosis Tumoral alfa/inmunologíaRESUMEN
Adenosine 5'-triphosphate (ATP) stimulates airway epithelial Cl(-) secretion in a complicated manner. We examined the difference between ATP- and uridine 5'-triphosphate (UTP)-induced responses of short-circuit current (Isc) in bovine tracheal epithelium treated with amiloride. Each nucleotide caused an increase in Isc composed of the first and second peaks, where the second peak induced by ATP was higher compared with UTP. The ATP-induced second peak was inhibited by the protein kinase (PK) A inhibitor H89, saturation of P1 receptor with adenosine, and the P1 receptor antagonist 8-p-sulfophenyltheophylline, but not by the Ca(2+) chelator ethyleneglycol-bis-(beta-aminoethyl ether)-N,N,N',N'-tetraacetic acid plus the endoplasmic reticulum Ca(2+)-pump inhibitor thapsigargin, the adenosine breakdown enzyme adenosine deaminase, the ectonucleotidase inhibitor alpha,beta-methyleneadenosine 5'-diphosphate, or saturation of P2Y2 receptor with UTP. Thus, the response is associated with PKA-dependent pathway via P1-like receptor but not with Ca(2+)-dependent pathway via P2Y2 receptor, and ATP degradation products do not contribute to this response. Further, stimulation of cells with ATP increased PKA activity. In addition, pretreatment with glybenclamide, an inhibitor of cystic fibrosis transmembrane conductance regulator, reduced the second peak of Isc induced by ATP but was without effect on that induced by UTP. Therefore, ATP stimulates glybenclamide-sensitive Cl(-) secretion, and this action is partly mediated by PKA-dependent pathway via P1-like receptor.
Asunto(s)
Adenosina Trifosfato/farmacología , Cloruros/metabolismo , Mucosa Respiratoria/metabolismo , Tráquea/metabolismo , Uridina Trifosfato/farmacología , Adenosina/farmacología , Adenosina Trifosfato/análogos & derivados , Amilorida/farmacología , Animales , Calcio/metabolismo , Bovinos , Células Cultivadas , Canales de Cloruro/antagonistas & inhibidores , Colforsina/farmacología , AMP Cíclico/metabolismo , Proteínas Quinasas Dependientes de AMP Cíclico/antagonistas & inhibidores , Proteínas Quinasas Dependientes de AMP Cíclico/metabolismo , Diuréticos/farmacología , Electrofisiología , Inhibidores Enzimáticos/farmacología , Agonistas Purinérgicos , Antagonistas Purinérgicos , Receptores Purinérgicos/metabolismo , Mucosa Respiratoria/citología , Mucosa Respiratoria/efectos de los fármacos , Transducción de Señal/fisiología , Espectrometría de Fluorescencia , Tráquea/citología , Tráquea/efectos de los fármacosRESUMEN
Superfusion of canine tracheal mucosa with 100 microg each of grepafloxacin and ciprofloxacin per ml reduced the electrical transepithelial potential difference in vivo by more than 50%. This effect was dose dependent, specific for new quinolones, and inhibited by Cl channel blockers, indicating that new quinolones attenuate Cl secretion across the airway epithelium.
Asunto(s)
Antiinfecciosos/farmacología , Ciprofloxacina/farmacología , Fluoroquinolonas , Piperazinas/farmacología , Tráquea/efectos de los fármacos , Animales , Perros , Relación Dosis-Respuesta a Droga , Células Epiteliales/efectos de los fármacos , Células Epiteliales/fisiología , Potenciales de la Membrana/efectos de los fármacos , Tráquea/fisiologíaRESUMEN
FK506 (tacrolimus)-binding protein (FKBP) is associated with intracellular Ca2+ release channel and modulates its function. To elucidate the effect of FK506 on Ca2+ dynamics and Ca2+-mediated Cl- secretion in airway epithelium, we studied intracellular Ca2+ ([Ca2+]i) concentration and Cl(-)-dependent short-circuit current (Isc), in cultured bovine tracheal epithelial cells. Addition of ATP induced an increase in [Ca2+]i, and this response was dose dependently inhibited by FK506. Rapamycin, which binds FKBP with high affinity, likewise inhibited the [Ca2+]i rise, but cyclosporin A, a specific calcineurin inhibitor, did not. In Cl- secretion studies using Ussing chamber, ATP increased Ca2+-mediated Isc in amiloride-treated cells, an effect that was inhibited by FK506 and rapamycin but not by cyclosporin A. Therefore, FK506 inhibits Ca2+ mobilization in airway epithelium via FKBP but not calcineurin-dependent mechanism, which may result in the suppression of Ca2+-activated Cl- secretion.
Asunto(s)
Adenosina Trifosfato/antagonistas & inhibidores , Calcineurina/farmacología , Calcio/metabolismo , Cloruros/metabolismo , Inmunosupresores/farmacología , Músculo Liso/efectos de los fármacos , Proteínas de Unión a Tacrolimus/farmacología , Tacrolimus/farmacología , Adenosina Trifosfato/farmacología , Animales , Bovinos , Células Cultivadas , Interacciones Farmacológicas , Músculo Liso/metabolismo , TráqueaRESUMEN
OBJECTIVE: Transepithelial ion transport plays an important role in the regulation of the amount and the rheological properties of bronchial secretion. The effect of grepafloxacin (GPFX), a new quinolone agent, on bioelectrical properties of airway epithelium was determined. METHODOLOGY: Electrical properties of bovine tracheal epithelium cultured under an air-liquid interface condition were measured by the short-circuit technique. RESULTS: Addition of GPFX (100 microg/mL) to the mucosal side decreased short-circuit current (Isc) from 14.4 +/- 1.3 to 5.6 +/- 0.6 microA/cm2 (P < 0.001), and the response was accompanied by corresponding decreases in transepithelial potential difference and cell conductance. This effect was concentration dependent, and a similar response was also noted when GPFX was added to the submucosal side. The GPFX-induced decrease in Isc was not altered by the Na+ channel blocker amiloride, but was inhibited by the Cl- channel blocker diphenylamine-2-carboxylate or Cl(-)-free medium (P < 0.001, in each case). Furthermore, GPFX reduced Cl- conductance (P < 0.01) without affecting Na+ conductance of the epithelium. CONCLUSIONS: Grepafloxacin selectively inhibits Cl- secretion across tracheal epithelial cells, which may result in the inhibition of water secretion and, hence, the reduction of airway secretion.
Asunto(s)
Antiinfecciosos/farmacocinética , Cloruros/fisiología , Fluoroquinolonas , Piperazinas/farmacocinética , Mucosa Respiratoria/efectos de los fármacos , Esputo/metabolismo , Tráquea/metabolismo , Animales , Bovinos , Células Cultivadas , Conductividad Eléctrica , Técnicas In Vitro , Transporte Iónico/efectos de los fármacos , Potenciales de la Membrana/efectos de los fármacos , Mucosa Respiratoria/metabolismo , Esputo/efectos de los fármacos , Factores de Tiempo , Tráquea/citología , Tráquea/efectos de los fármacosRESUMEN
We studied the effects of reactive oxygen species (ROS) on intracellular Ca2+ concentration ([Ca2+]i) and their possible modulation by nitric oxide (NO) in fura-2-loaded cultured bovine tracheal epithelium. Hypoxanthine (HX) and xanthine oxidase (XO), which generate superoxide anion (O2-) and hydrogen peroxide (H2O2), dose dependently increased [Ca2+]i. The increase in [Ca2+]i was reduced in the presence of superoxide dismutase (SOD, 200 U/mL) and catalase (200 U/mL) by 29% and 43%, respectively. The iron chelator o-phenanthroline and the hydroxyl radical (.OH) scavenger dimethylthiourea (DMTU) more potently inhibited the response of [Ca2+]i. H2O2-derived .OH generated by the Fenton reaction caused a marked [Ca2+]i elevation, but exogenous H2O2 did not. Sodium nitroprusside (100 microM), an NO donor, potentiated HX-XO-induced [Ca2+]i rise by 50%, an effect that was abolished in the presence of SOD or DMTU. These results suggest that .OH formed by interaction of O2- and H2O2 in the presence of iron may play a major role in the HX-XO-induced disruption of airway epithelial Ca2+ homeostasis, and that NO potentiates ROS-induced [Ca2+]i response, presumably by reacting with O2- and producing .OH.
Asunto(s)
Calcio/metabolismo , Óxido Nítrico/farmacología , Especies Reactivas de Oxígeno , Superóxidos/farmacología , Tiourea/análogos & derivados , Tráquea/metabolismo , Animales , Catalasa/farmacología , Bovinos , Células Cultivadas , Relación Dosis-Respuesta a Droga , Epitelio/efectos de los fármacos , Epitelio/metabolismo , Peróxido de Hidrógeno/metabolismo , Hipoxantina/farmacología , L-Lactato Deshidrogenasa/metabolismo , Nitroprusiato/farmacología , Fenantrolinas/farmacología , Especies Reactivas de Oxígeno/fisiología , Superóxido Dismutasa/farmacología , Tiourea/farmacología , Tráquea/efectos de los fármacos , Xantina Oxidasa/farmacologíaRESUMEN
Mince of 98-wk-old spent hens was washed two times with 0.1% NaCl. Portions of unwashed and washed mince were mixed with a cryoprotectant (CP) composed of 4% sucrose, 4% sorbitol, and 0.2% Na-tripolyphosphate and were immediately frozen and stored at -20 C. Mince without CP was run as control. Textural properties of the stored mince and surimi were measured at 1-mo intervals for 6 mo, after being thawed at 4 C overnight, ground with 3% NaCl, and heated at 90 C for 15 min. For freeze-thaw stability study, minces were subjected to six freeze-thaw cycles. Each freeze-thaw cycle was carried out at 1 mo of storage. Textural quality parameters (gel strength, breaking strength, deformation, protein solubility, expressible moisture, cooking yield, folding test, drip-loss, and sensory scores) were decreased in both unwashed and washed mince, mostly during the early stages of storage. Washed mince showed significantly better textural properties than unwashed mince. Washing protected the gel quality of the hen mince from degradation during frozen storage. Cryoprotectants could not protect the gel strength or breaking strength, but deformation was slightly improved. Water-retention properties were protected, and folding test and sensory scores were well preserved in the mince with added CP. Cryoprotectants had a beneficial effect on frozen, stored spent hen surimi to protect the elasticity and cohesiveness of the gel.
Asunto(s)
Pollos , Crioprotectores/farmacología , Manipulación de Alimentos/métodos , Conservación de Alimentos , Congelación , Productos Avícolas , Animales , Femenino , Calor , Concentración de Iones de Hidrógeno , Control de CalidadRESUMEN
Thermal gelation properties of spent hen mince and surimi were investigated. The mince from 98-wk-old spent hens was washed two times with 0.1% NaCl. A portion of unwashed and washed mince was mixed with 4% sugar, 4% sorbitol, and 0.2% Na-tripolyphosphate to produce surimi and was kept frozen at -20 C. The mince and surimi were ground with 3% NaCl and a small amount of water to adjust the final moisture content to 80%. A 6 to 8% potato starch was mixed with some pastes. The pastes were stuffed into sausage casings and heated by one-step and two-step heating. The effects of washing, heating, and addition of ingredients on the color, composition, and functional properties of the mince and gel were compared. Washed, spent hen mince was lighter and less red in color and higher in collagen, gel strength, water-holding ability, and cooking yield than unwashed mince. The best temperature and time schedule for the gelation of spent hen mince was 90 C for 15 min in one-step heating. Heating at 100 C for 5 min after preheating at 60 to 70 C for 30 min resulted a gel with distinctly improved gel strength. Sucrose (4%), sorbitol (4%), and Na-tripolyphosphate (0.2%) improved the gel quality of nonfrozen mince but showed little cryoprotective effect against the degradation of frozen-stored product. A 6% potato starch improved the gel texture, cooking yield, and water-holding ability compared with 8% starch.
Asunto(s)
Manipulación de Alimentos , Geles , Calor , Productos Avícolas , Animales , Pollos , Colágeno/análisis , Color , Femenino , Concentración de Iones de Hidrógeno , Polifosfatos/farmacología , Sorbitol/farmacología , Almidón/farmacología , Sacarosa/farmacologíaRESUMEN
Spent hen (98 weeks) and broiler (12 weeks) breast and thigh muscles were minced (1 mm orifice diameter) and washed with 0.1% NaCl. A portion of both unwashed and washed mince was mixed with cryoprotectants (CP) at the rate of 4% sucrose, 4% sorbitol, and 0.2% Na-tripolyphosphate to produce surimi and kept frozen at -20°C. The mince and surimi were ground with 3% NaCl and a small amount of water to adjust the final moisture content of 80%. The pastes were stuffed into the sausage casing and heated at 90°C for 15 min to produce gel. The effects of washing, heating and CP on colour composition and thermal gelation properties of hen and broiler minces and surimi were compared. Broiler mince was lighter and less red in colour, higher in protein and lower in moisture, lipid and collagen. Gel strength and breaking strength were higher in spent hen surimi compared to broiler surimi under similar gelation conditions. Gel elasticity, springiness and water retention properties were almost identical in two surimi. Gel quality was markedly deteriorated in spent hen surimi but not so in broiler surimi after 8 weeks frozen-storage. Although CP increased the gel strength of fresh surimi (non-frozen, 0 week storage) from both hen and broiler, they were more effective in broiler surimi than hen surimi in protecting the functional quality of gel.
RESUMEN
To elucidate the effect of FK506 on Ca2+ oscillations in airway epithelium, we investigated cultured cow tracheal epithelial cells with a Ca2+ image-analysis system. ATP (1 microM) induced long-lasting Ca2+ oscillations, having nearly constant peak values (300-400 nM) and intervals (20-40 s) in subconfluent cells but not in confluent cells. These responses were gradually attenuated and abolished by the addition of FK506. Rapamycin, which binds the FK506-binding protein (FKBP), likewise inhibited Ca2+ oscillations, whereas cyclosporin A, a calcineurin inhibitor, did not. Treatment of cells with FK506 decreased Ca2+ content in thapsigargin-sensitive stores, suggesting that the partial depletion of the stores causes the inhibition of Ca2+ oscillations. Immunocytochemistry revealed the existence of cytoplasmic FKBP-like immunoreactivities. The expression of a 12-kDa FKBP was greater in subconfluent cells than in confluent cells as determined by Western blotting, suggesting that the 12-kDa FKBP may be one of the factors that regulates Ca2+ oscillations. Therefore, FK506 possesses an inhibitory action on the Ca2+ response via intracellular FKBP but not via calcineurin, which may result in modification of airway epithelial functions.
Asunto(s)
Adenosina Trifosfato/farmacología , Calcio/metabolismo , Inmunosupresores/farmacología , Membranas Intracelulares/metabolismo , Tacrolimus/farmacología , Tráquea/metabolismo , Animales , Bovinos , Células Cultivadas , Inhibidores Enzimáticos/farmacología , Células Epiteliales/efectos de los fármacos , Células Epiteliales/metabolismo , Femenino , Oscilometría , Tapsigargina/farmacología , Tráquea/citología , Tráquea/efectos de los fármacosRESUMEN
Erythromycin (EM) therapy is known to decrease airway secretion in chronic inflammatory airway diseases such as diffuse panbronchiolitis. Airway secretion is regulated by intracellular Ca2+ concentration ([Ca2+]i). To elucidate the intracellular site of action of EM in airway epithelium, we examined the effect of EM on Ca2+ dynamics in cultured bovine tracheal epithelial cells using fura-2. EM per se did not cause any change in [Ca2+]i. Adenosine triphosphate (ATP; 10(-4) M) induced a biphasic [Ca2+]i increase, consisting of a transient response followed by a sustained response. Pretreatment of cells with EM had little effect on the ATP-induced transient Ca2+ response but substantially reduced the sustained response in a dose-dependent manner. Clarithromycin, another 14-membered ring macrolide, likewise showed the inhibitory effect, but ampicillin and cephasolin did not. Uridine triphosphate (UTP; 10(-4) M) induced a biphasic [Ca2+]i increase similar to ATP, and the UTP-induced sustained Ca2+ response was also inhibited by EM. In Ca2+-deficient medium (1 mM ethyleneglycol-bis-(beta-aminoethyl ether)-N, N'-tetraacetic acid [EGTA]) or in the presence of La3+, the sustained Ca2+ response disappeared, suggesting that EM may inhibit Ca2+ influx induced by P2u purinoceptor stimulation. In single-cell Ca2+ image analysis, low concentration of ATP (10(-6) M) induced Ca2+ oscillations, which were also inhibited by EM. The disappearance of [Ca2+]i oscillations after addition of EM was similar to that after addition of EGTA. These results suggest that EM may decrease Ca2+-dependent airway secretion by inhibiting agonist-stimulated Ca2+ influx.
Asunto(s)
Adenosina Trifosfato/farmacología , Calcio/metabolismo , Eritromicina/farmacología , Tráquea/efectos de los fármacos , Animales , Antibacterianos/farmacología , Bovinos , Células Cultivadas , Fluorescencia , Fura-2/metabolismo , Procesamiento de Imagen Asistido por Computador , Lantano/farmacología , Uridina Trifosfato/farmacología , Verapamilo/farmacologíaRESUMEN
In order to investigate the mechanisms of body temperature change from a thermodynamic aspect, we investigated the specific gravity, specific heat and surface area of rabbit in situ. We obtained the following results. 1. The specific gravity of normal, shorn and ecdysed rabbits is 0.94, 0.95 and 0.97, respectively. 2. The specific heat of normal, shorn and ecdysed rabbits is 0.95, 0.89 and 0.69 cal/g.K, [corrected] respectively. 3. The surface area of the rabbit was also measured by using the weight of aluminum foil which covered the surface.
Asunto(s)
Superficie Corporal , Temperatura Corporal/fisiología , Calor , Animales , Cabello/fisiología , Conejos , Fenómenos Fisiológicos de la Piel , Gravedad Específica , TermodinámicaRESUMEN
A 48-year-old man was admitted because of persistent dry cough for six months. He had been a smoker for 25 years, averaging a pack a day, and demonstrated clubbing of the fingers. Basilar fine crackles were observed in both lung fields. Chest X-ray films on admission showed diffuse reticulonodular shadows. Chest computed tomograms showed low-attenuation areas mainly in the center of the upper lung field, and ground-glass opacity, air bronchiolograms, and perivascular interstitial thickening of the peripheral vessels mostly in the lower field. A Gascintigram disclosed mild accumulation in both lungs. A transbronchial lung biopsy specimen did not reveal special features. However, a biopsy specimen obtained by thoracoscopy showed evidence of respiratory bronchiolitis, with a mononuclear inflammatory process involving respiratory bronchioles and adjacent air space, associated with mild fibrous thickening of the peribronchiolar interstitium and surrounding alveoli septa. These findings suggested that the patient had respiratory bronchiolitis-associated interstitial lung disease, the second case to be reported in Japan.