A comparative study of ammonia transport across ruminal epithelia from Bos indicus crossbreds versus Bos taurus.

A comparative study of ammonia transport across ruminal epithelia from Bos indicus crossbreds versus Bos taurus.
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印度牛与金牛杂交瘤胃上皮氨转运的比较研究

DOI:
10.1111/asj.13107
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发表时间:
2018
期刊:
Animal science journal = Nihon chikusan Gakkaiho
影响因子:
--
通讯作者:
Stumpff
Stumpff
中科院分区:
--
文献类型:
--
作者:
Rabbani;Akhtar;Rosendahl;Grunau;Tietjen;Masood;Kaessmeyer;Gunzel;Rehman;Stumpff

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牛瘤胃吸收氨会降低发酵蛋白质合成的氮利用率,导致牛与人类对蛋白质的竞争加剧,并增加有毒含氮化合物向环境的释放。鉴于饲养和繁殖的差异可能导致瘤胃氨转运的差异,我们比较了野牛杂交品种(Sahiwal-Mix,SWM)与牛(Holstein-Friesian,HF)瘤胃上皮的电生理学、组织学和分子生物学特征。与 HF 一样,SWM 的复层角化上皮表达密蛋白 1 和 4。氨通量 (HF) 和浆膜 pH 值(两个品种)的测量表明,在粘膜 pH 值为 6.4 时,净转运主要以 NH4+ 形式发生。如之前针对 HF 的研究所示,NH4+ 会引起 SWM 中短路电流 (Isc) 的浓度依赖性上升,而 TRP 通道激动剂薄荷醇可以进一步刺激这种上升。 SWM 中 TRPV3、TRPV4、TRPM6 和 TRPM7 的相对 mRNA 表达水平显着低于 HF 中,TRPA1 表达接近检测限。我们得出的结论是,两个品种的瘤胃对氨的吸收均以 NH4+ 的形式发生,功能和分子生物学证据表明 TRPV3 和 TRPV4 参与其中。
Absorption of ammonia from the rumen of cattle decreases nitrogen availability for fermentational protein synthesis, leading to increased competition of cattle with humans for protein and enhancing the release of toxic nitrogenous compounds into the environment. Given that differences in feeding and breeding might induce differences in ruminal ammonia transport, we compared electrophysiological, histological, and molecular biological characteristics of ruminal epithelia ofBos indicuscrossbreds (Sahiwal‐Mix, SWM) with those ofBos taurus(Holstein‐Friesian, HF). As in HF, the stratified cornified epithelium of SWM expressed claudin 1 and 4. Measurements of ammonia flux (HF) and serosal pH (both breeds) suggested that at a mucosal pH of 6.4, net transport primarily occurred as NH4+. As shown previously for HF, NH4+induced a concentration‐dependent rise in short circuit current (Isc) in SWM that could be further stimulated by the TRP channel agonist menthol. Relative mRNA expression levels for TRPV3, TRPV4, TRPM6, and TRPM7 were significantly lower in SWM than in HF, with TRPA1 expression near the limit of detection. We conclude that uptake of ammonia from the rumen of both breeds occurs electrogenically as NH4+with functional and molecular biological evidence pointing towards involvement of TRPV3 and TRPV4.
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