139 research outputs found
Incorporation of NAD into fixed cell nuclei
é沢倧åŠå»è¬ä¿å¥ç 究åå»åŠç³»Incorporation of NAD into the nuclei was determined autoradiographically in cultured HeLa cells and in cryostat sections of rat organs by incubating them with 3H-NAD after fixation with various agents. Acetone fixation was the best to render the cells permeable to NAD while preserving the cell\u27s enzymatic activity to incorporate NAD into nuclear macromolecules. Various evidence supported that such incorporation of NAD is due mostly to the synthesis of poly (ADP-ribose) on chromatin proteins. In the sections of rat jejunum and esophagus the rate of NAD incorporation was higher in the actively proliferating cell nuclei than in the differentiated cell nuclei within the same epithelia. These results suggested that the capacity of the cells to synthesize poly (ADP-ribose) is associated with cell growth and differentiation. © 1987
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žã®åžåã»ä»£è¬ã«é¢äžãããšãããLãŒFABPã®å·å现èã§ã®çºçŸã瀺ããŠããã®çŽ°èçš®ã®æ©èœã®è§£æã«ç³žå£ãäžãããThe brush cell, also referred to as the tuft cell, is a rare cell type known to occur in the endoderm-derived epithelia of many mammalian species. In the present study, we found that an antibody against Liver-type Fatty Acid-Binding Protein (L-FABP) specifically immunostained the gastrointestinal brush cells of the rat, and utilized this immunoreactivity as a specific marker of the brush cell to elucidate its previously unclarified aspects.The largest populations of brush cells were found in the stomach and common bile duct. In the stomach, brush cells were present in a group in the groove of cardiac region as well as scattered singly in the surface and foveolar epithelia of the fundic and pyloric regions, with intense immunoreactivity for L-FABP. Morphologically, it was clarified that all brush cells had a thin basal cytoplasmic process without secretory granules. In the ontogeny of rats, brush cells first occurred in the new born stomach, with immunoreactivity for L-FABP, and increas ed remarkably in number within the few weeks following the end of the first 2 weeks of sackling period.In the common bile duct, The brush cells as recognized by scanning electron microscopy first appeared in the epithelium at 4 weeks after birth. They showed a remarkable increase in number between 8 and 16 weeks and finally occupied about 30 % of the total epithelial cell population of common bile duct. The initial development of brush cells in the females delayed for approximately 2 weeks from that of males. On the other hand, the L-FABP-immunoreactive brush cells first appeared only after 8 weeks postpartum. They showed a gradual increase in number after 16 weeks but reached only about 25 % of the total brush cell population by the time of 40 weeks.The present study, by virtue of the specific histochemical marker, provided new findings concerning the distribution, morphology and ontogeny of the brush cell. Also, the expression of L-FABP in the brush cell may shed light on the functional aspect of this cell type in relation to the fatty acid meTabolism.ç 究課é¡/é åçªå·:01570006, ç 究æé(幎床):1989-1990ç 究æ©é¢: é沢倧åŠå»åŠéšåºå
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ºã§ã¯é¡èã«ä¿é²ãããããããã®èçœè³ªãSubmandibular androglen-repressed protein(SMARP)ãšåã¥ãããSMARPã®mRNAãšèçœè³ªã¯é¡äžè
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ºæ¿çŽ°èã«å±åšãããç°ãªãåšå®ã§ã¢ã³ããã²ã³ã«ããå察ã®çºçŸå¶åŸ¡ãåããéºäŒåã¯ãã¢ã³ããã²ã³ã«ããéºäŒåçºçŸå¶åŸ¡æ©æ§ã®è§£æã«å¯äžãããšæããã(è«æ3)ã1)A novel protein expressed in rat sublingual gland : We cloned a novel rat gene expressed primarily in the sublingual gland and named the predicted 503 amino-acid protein SLAMP (sublingual acinar membrane protein). SLAMP had 63% homology with human ERGIC-53-like protein, a member of the family of animal L-type lectins. SLAMP mRNA and protein were expressed predominantly in the mucous acinar cells of sublingual gland. Ultrastructurally, SLAMP was localized to the ER-Golgi intermediate compartment (ERGIC), suggesting that SLAMP functions in the early secretory pathway of glycoproteins. 2)A new method of producing rat polyclonal antibodies with shorter time and lower cost: Producing antibodies usually takes a long time. We developed a new method of producing polyclonal antibodies in less than a month, based on preparation of the recombinant oligopeptides as antigen followed by immunization of rats. Using this method, we produced antisera against ERGIC-53 and confirmed its localization in the ERGIC. 3)A novel submandibular androgen-repressed protein of the mouse: We characterized a cDNA clone derived from the female mouse submandibular gland (SMG). The protein product of this clone had a 165-amino acid protein with a putative signal sequence and was named submandibular androgen-repressed protein (SMARP). In the mouse SMARP mRNA was expressed only in the SMG and exorbital lacrimal gland (LG). The level of SMARP mRNA was 36 times higher in female than male SMG, whereas it was 28 times higher in male than female LG. Furthermore, it was reduced in SMG but increased in LG after administration of testosterone to females or castrated males. SMARP mRNA and protein were predominantly localized in acinar cells in both SMG and lacrimal gland. These results suggested that SMARP is a secretory protein whose expression is regulated by androgens negatively in the SMG and positively in the LG.ç 究課é¡/é åçªå·:17590154, ç 究æé(幎床):2005-2006ç 究æ©é¢: é沢倧åŠå»åŠç³»ç 究ç§åºå
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ã·ã°ãã«äŒéç³»ã®éã«çžäºäœçš(ã¯ãã¹ããŒã¯)ãããããšã瀺åããããIn the rodent submandibular glands (SMG), acinar cell proliferation and differentiation in the early postnatal weeks are dependent on the β adrenergic autonomic nervous system, whereas the differentiation of duct cells into granular convoluted tubule (GCT) cells in the puberty is dependent on androgens. In the present study, we have revealed the following things :1) In both the proliferating acinar cells and the duct cells undergoing differentiation into GCT cells in the rat SMG, the transcription factor CREB occurs temporalily in the nuclei and plays essential roles in the cell proliferation and differentiation as shown by mmunohistochemistry and the antisense inhibition technique.2) During 3-4 weeks postpartum, when the acinar cells stop proliferation and switch to differentiation, the immature cells located in the center of the acini temporarily express the 25 kD heat shock protein (Hsp25) before they differentiate into the mature acinar cells.3) In the SMG of hypophysectomized rat, the induction of the protease inhibitor cystatin S mRNA 24 h afer a single administration of the β adrenergic agonist isoproterenol is much less than that in the control. Administration of one of the pituitary-dependent hormones, i.e., testosterone, estradiol, dexamethasone and thyroxine, together with isoproterenol results in marked recovery of the cystatin S mRNA expression.4) In the SMG of mice, the expression of JunD, an oncogen product and transcription factor, is localized to the duct system and much more abundant in the female than in the male gland. During the postnatal development and the testosterone-induced GCT cell differentiation, JunD expression is temporarily induced in the nuclei of striated duct cells and disappeares as they differentiate into GCT cells.These results suggested the existence of cross-talks between multiple signaling pathways responsible for the proliferation and differentiation of acinar and duct components of the rodent SMG.ç 究課é¡/é åçªå·:13670006, ç 究æé(幎床):2001-2002ç 究æ©é¢: é沢倧åŠå»åŠç³»ç 究ç§åºå
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