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Localization of urea transporter B in the developing bovine rumen

Animal Nutrition 2022年第3期10卷 216-222页

作者： Chongliang Zhong Tamsin Lyons orla heussaff Evelyn Doyle Eoin O'Hara Sinead M.Waters David Kenny Gavin S.Stewart School of Biology and Environmental Science University College DublinBelfieldDublin 4Ireland Animal and Bioscience Research Department Animal and Grassland Research and Innovation CentreTeagascGrangeCounty MeathIreland Department of Agriculture Foodand Nutritional SciencesUniversity of AlbertaEdmontonAlbertaCanada

Urea nitrogen secreted from blood to rumen is a crucial factor shaping the symbiotic relationship between host ruminants and their microbial *** of urea across rumen epithelia is facilitated by urea transporter B(UT-B),but the long-term regulation of these proteins remains *** ruminal function develops over a period of months,the developing rumen is an excellent model with which to investigate this *** rumen epithelium samples of calves from birth to 96 d of age,this study performed immunolocalization studies to localize and semi-quantify UT-B protein *** expected,preliminary experiments confirmed that ruminal monocarboxylate transporter 1(MCT1)short chain fatty acid transporter protein abundance increased with age(P<0.01,n=4).Further investigation revealed that ruminal UT-B was present in the first few weeks of life and initially detected in the basolateral membrane of stratum basale *** the next 2 months,UT-B staining spread to other epithelial layers and semi-quantification indicated that UT-B abundance significantly increased with age(P<0.01,n=4 or 6).These changes were in line with the development of rumen function after the advent of solid feed intake and weaning,exhibiting a similar pattern to both MCT1 transporters and papillae *** study therefore confirmed age-dependent changes of in situ ruminal UT-B protein,adding to our understanding of the long-term regulation of ruminal urea transporters.

关键词： UT-B Immunolocalization Rumen Bovine Development

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