139 research outputs found

    Incorporation of NAD into fixed cell nuclei

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    金沢倧孊医薬保健研究域医孊系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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    金沢倧孊十党医孊䌚雑誌に぀いお

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    消化噚系における脂肪酞結合蛋癜の圹割に関する組織化孊的研究

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    金沢倧孊医孊郚研究課題/領域番号:63770007, 研究期間(幎床):1988出兞研究課題「消化噚系における脂肪酞結合蛋癜の圹割に関する組織化孊的研究」課題番号63770007KAKEN科孊研究費助成事業デヌタベヌス囜立情報孊研究所 https://kaken.nii.ac.jp/ja/grant/KAKENHI-PROJECT-63770007/を加工しお䜜

    消化管タフト现胞の圢態,発生,動態,機胜の党容: 組織化孊的研究

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    タフト现胞(以䞋、最近の甚語ずしお刷子现胞ずする)はヒトを含む哺乳動物の内胚葉由来の䞊皮に散圚する特殊な现胞皮であるが、その本態に぀いおは䞍明の点が倚かった。本研究で代衚者らはラットの肝蔵型脂肪酞結合蛋癜(L‐FABP)ぞの抗䜓が刷子现胞を特異的に免疫染色するこずを発芋し、これをマ-カ-ずしお利甚し、ラット消化噚系における刷子现胞に぀いおいく぀かの新しい所芋を芋いだした。刷子现胞が高頻床に芋぀かったのは胃および総胆管であった。胃においおは噎門郚䞊皮に集合的に、たた胃䜓郚および幜門郚の衚局および胃小〓に散圚性に刷子现胞が存圚し、すべおLヌFABP陜性であった。圢態的には、すべおの刷子现胞が基底郚に现い现胞質突起を有し、そこには䜕らの分泌果粒も存圚しないこずが確認された。ラットの個䜓発生においお、刷子现胞は既に生埌0日の胃にLヌFABP陜性を有しお存圚し、最初の2週間の乳飲みの時期が終了した埌の生埌3、4週のうちに急激にその数を増すこずがわかった。総胆管の䞊皮においおは、走査電顕の芳察により圢態孊的に認められる刷子现胞は生埌4週間でやっず出珟したが、LヌFABP免疫陰性であった。刷子现胞の頻床は雄性ラットでは第8週から12週にかけお、雌では玄2週間遅れお第10週から14週にかけお急激に増加し、性差が芋られたが、䞡性ずも生埌16週以埌、党䞊皮现胞の玄30%に達しお䞀定ずなった。䞀方、LヌFABP陜性の刷子现胞は生埌8週で初めお出珟し、16週以埌陀々に増加したが、40週の時点でも党総胆管刷子现胞の玄25%ほどの陜性率であった。本研究は特異的なマ-カ-の䜿甚により、刷子现胞の分垃、圢態、発生の詳现を明らかにしたのみならず、脂肪酞の吞収・代謝に関䞎するずされるLヌFABPの刷子现胞での発珟を瀺しお、この现胞皮の機胜の解明に糞口を䞎えた。The 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.研究課題/領域番号:01570006, 研究期間(幎床):1989-1990研究機関: 金沢倧孊医孊郚出兞「消化管タフト现胞の圢態,発生,動態,機胜の党容: 組織化孊的研究」研究成果報告曞 課題番号01570006 (KAKEN科孊研究費助成事業デヌタベヌス囜立情報孊研究所)   本文デヌタは著者版報告曞より䜜

    発生・分化に䌎うクロマチン構造倉化の組織化孊的研究

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    金沢倧孊医孊郚研究課題/領域番号:62770010, 研究期間(幎床):1987出兞研究課題「発生・分化に䌎うクロマチン構造倉化の組織化孊的研究」課題番号62770010KAKEN科孊研究費助成事業デヌタベヌス囜立情報孊研究所 https://kaken.nii.ac.jp/ja/grant/KAKENHI-PROJECT-62770010/を加工しお䜜

    顎䞋腺導管系の分化における遺䌝子発珟の研究

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    1)ラット舌䞋腺に発珟する新芏蛋癜質:ラットの舌䞋腺に特異的に発珟する遺䌝子をクロヌニングし、その産物ぞの抗䜓を䜜成した。この蛋癜質は動物L型レクチンの䞀皮であるヒトERGLずホモロゞヌを有する膜蛋癜質であり、Sublingual acinar membrane protein(SLAMP)ず名付けた。SLAMPは舌䞋腺の腺房现胞においお䞻に小胞䜓-ゎルゞ䞭間区画(ERGIC)の膜に局圚し、粘液成分の圢成や愉送、分泌に関䞎するこずが瀺唆された(論文1)。2)短期間、䜎予算でのラットポリクロヌナル抗䜓䜜成法の開発:抗原蛋癜質のcDNAの䞀郚を合成し、现菌に導入しおオリゎペプチドを産生させ、これをラット足蹠に泚射し、玄3週間で抗血枅を埗る方法を開発した。マりスのERGIC-53は、小胞䜓からERGICぞの小胞性茞送に関䞎する膜蛋癜質である。今回の方法で぀くった抗ERGIC-53ラット抗䜓によりマりス舌䞋腺现胞のERGICが染色されるこずから、SLAMPの圹割が掚枬された(論文2)。3)アンドロゲンにより発珟を抑制される顎䞋腺の新芏蛋癜質:遺䌝子サブトラクション法により、新芏の顎䞋腺蛋癜質の遺䌝子を同定した。この蛋癜質のmRNA発珟は顎䞋腺では雄より雌で36倍高く、逆に涙腺では雌より雄で28倍高かった。たた粟巣切陀マりスや雌マりスにアンドロゲンを投䞎するず、顎䞋腺では顕著に発珟が抑制され、逆に涙腺では顕著に促進されたため、この蛋癜質をSubmandibular androglen-repressed protein(SMARP)ず名づけた。SMARPのmRNAず蛋癜質は顎䞋腺および涙腺の腺房现胞に局圚した。異なる噚官でアンドロゲンにより反察の発珟制埡を受ける遺䌝子は、アンドロゲンによる遺䌝子発珟制埡機構の解明に寄䞎するず思われた(論文3)。1)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.研究課題/領域番号:17590154, 研究期間(幎床):2005-2006研究機関: 金沢倧孊医孊系研究科出兞「顎䞋腺導管系の分化における遺䌝子発珟の研究」研究成果報告曞 課題番号17590154 (KAKEN科孊研究費助成事業デヌタベヌス囜立情報孊研究所)   本文デヌタは著者版報告曞より䜜

    顎䞋腺の増殖ず分化におけるシグナル䌝達の研究

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    霧歯類の顎䞋腺の生埌発達においお、腺房郚の増殖・分化は自埋神経(βアドレナリン䜜動性)に、顆粒性導管の分化はホルモン(アンドロゲン)に䟝存するが、その现胞内シグナル䌝達系は明らかでない。本研究で次のこずが明らかになった。1)ラット生埌初期での顎䞋腺腺房现胞の増殖および思春期での顆粒性導管现胞の分化の䞡方においお、现胞栞に䞀過性に転写因子であるCREBが発珟し、必須の圹割を持぀こずが免疫組織化孊およびアンチセンス抑制法により瀺された。2)腺房の増殖が終了する生埌3〜4週に、腺房䞭心郚の未分化现胞が腺房现胞に分化するずき、䜎分子量ストレス蛋癜質である27kD熱ショック蛋癜質(Hsp25)が䞀過性に発珟するこずがわかった。3)腺房现胞における蛋癜分解酵玠阻害物質であるシスタチンS(cystatin S)の発珟は、βアドレナリン䜜動性薬剀であるむ゜プロテレノヌル(IPR)の投䞎により誘導されるこずが知られおいる。䞋垂䜓切陀ラットの顎䞋腺においお、IPRによるシスタチンSのmRNA増加が著明に䜎䞋しおいるこず、これにテストステロン、゚ストラゞオヌル、グルココルチコむド、チロキシンなどを投䞎するず、IPRの効果が著明に回埩するこずが分かり、シスタチンS発珟が神経ず䞋垂䜓の2重支配を受けるこずがわかった。4)マりス顎䞋腺においお、がん遺䌝子産物で転写因子ずしお働くJunDの発珟は導管系现胞の栞のみに局圚するこず、雄より雌マりスで発珟が高いこずがわかった。雌マりスにテストステロンを投䞎するず、JunD発珟が線条郚導管现胞で䞀過性に䞊昇した埌、顆粒性導管现胞ぞの分化ずずもに消倱するこずが瀺され、導管系の分化にJunDが関䞎するこずがわかった。以䞊の結果から、霧歯類の顎䞋腺における腺房および導管系の増殖や分化においお、様々な现胞内シグナル䌝達系の間に盞互䜜甚(クロストヌク)があるこずが瀺唆された。In 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.研究課題/領域番号:13670006, 研究期間(幎床):2001-2002研究機関: 金沢倧孊医孊系研究科出兞「顎䞋腺の増殖ず分化におけるシグナル䌝達の研究」研究成果報告曞 課題番号13670006 (KAKEN科孊研究費助成事業デヌタベヌス囜立情報孊研究所)   本文デヌタは著者版報告曞より䜜
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