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首页> 外文期刊>Endocrine Research >Regulation of MAPK activity in response to dietary sodium in the rat adrenal gland.
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Regulation of MAPK activity in response to dietary sodium in the rat adrenal gland.

机译:调节大鼠肾上腺中饮食钠对MAPK活性的影响。

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Stimulation of aldosterone biosynthesis by angiotensin II (AII) is thought to be mediated via the PLC, IP3 and intracellular calcium signalling pathway. MAPK (p42/p44) is involved in cell proliferation, and is also activated by AII, but its role in the adrenal response to dietary sodium is unclear. To study the relationship between AII receptor (ATR), MAPK and PKC isoforms, PKCalpha and PKCepsilon, mature Wistar rats were maintained on low or high sodium diets for 1 week. In adrenals from animals on a sodium deplete diet, total ligand binding to both ATR subtypes decreased in the zona glomerulosa (ZG). Under these conditions, active MAPK in the ZG decreased paralleling a decrease in active PKCalpha. In the inner zones (IZ), largely reflecting medullary events, low sodium did not affect MAPK activity. However active PKCalpha decreased. In adrenals from sodium-loaded animals, type 2 ATR (AT2R) binding was reduced in the ZG, while type 1 ATR (AT1R) increased in the IZ. Active MAPK increased in ZG, as did active PKCalpha and PKCepsilon. In IZ, ERK, PKCalpha and PKCepsilon were unchanged. These results suggest that in the ZG and IZ, two different modes of MAPK regulation may exist, utilising different PKC isoforms.
机译:血管紧张素II(AII)刺激醛固酮生物合成被认为是通过PLC,IP3和细胞内钙信号通路介导的。 MAPK(p42 / p44)参与细胞增殖,并且也被AII激活,但是其在饮食钠对肾上腺反应中的作用尚不清楚。为了研究AII受体(ATR),MAPK和PKC亚型,PKCalpha和PKCepsilon之间的关系,将成年的Wistar大鼠维持低钠或高钠饮食1周。在缺乏钠饮食的动物的肾上腺中,在两个肾小球(ZG)中,与两种ATR亚型结合的总配体均下降。在这些条件下,ZG中的活性MAPK降低,而活性PKCalpha降低。在内部区域(IZ)(主要反映髓质事件),低钠不会影响MAPK活性。但是活性PKCalpha降低。在钠负荷动物的肾上腺中,ZG中2型ATR(AT2R)的结合减少,而IZ中1型ATR(AT1R)的结合增加。活性MAPK在ZG中增加,活性PKCalpha和PKCepsilon也增加。在IZ中,ERK,PKCalpha和PKCepsilon不变。这些结果表明,在ZG和IZ中,利用不同的PKC亚型,可能存在两种不同的MAPK调节模式。

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