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Increased ectopic fat cells in the longitudinal muscularis layer of the oviduct isthmus in obese J apanese B lack cows
Author(s) -
Maki Sachiko,
Kadokawa Hiroya
Publication year - 2014
Publication title -
animal science journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.606
H-Index - 38
eISSN - 1740-0929
pISSN - 1344-3941
DOI - 10.1111/asj.12110
Subject(s) - ampulla , oviduct , biology , ovulation , endocrinology , medicine , anatomy , andrology , hormone
In obese humans, mesenchymal stem cells differentiate to become ectopic fat cells in muscles. These ectopic fat cells inhibit the contraction of vascular smooth muscles. Stem cells have been recently identified in the human oviduct, a structure important in reproduction. We therefore investigated the number of O il R ed O ( ORO )‐positive cells in the oviducts of control J apanese B lack cows ( n = 6; body condition score [ BCS ], 3.0 on a 5‐point scale) compared to those with diet‐induced obesity ( n = 5; BCS , 4.0). We stained the ampulla and isthmus collected on the second day after ovulation with ORO and then counted the positive cells in each layer in 10 cross‐sections of the ampulla or isthmus. The obese group (23.4 ± 3.4 in the 10 sections) had larger numbers of ORO ‐positive cells in the longitudinal muscularis of the isthmus ( P < 0.05) than did the control group (15.0 ± 2.4). ORO ‐positive cells were also observed in all other layers of the isthmus and ampulla; however, the number of cells in these layers did not differ significantly between obese cows and controls. Whether this observed increase in ORO ‐positive cells in the oviducts of obese cows affects their reproduction warrants further study.