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FADHILLAH Shin YOSHIOKA Ryo NISHIMURA Kiyoshi OKUDA 《The Journal of reproduction and development》2014,60(3):194-201
To determine whether hypoxia has an effect on luteinization, we examined the influence of hypoxia on a model of bovine
luteinizing and non-luteinizing granulosa cell culture. The granulosa cells were obtained from small antral follicles (≤ 6 mm
in diameter). To induce luteinization, the cells were treated for 24 h with insulin (2 µg/ml), forskolin (10 µM) or insulin
in combination with forskolin at 20% O2. After 24 h, progesterone (P4) production was higher in the treated cells,
which we defined as luteinizing granulosa cells, than in non-treated cells, which we defined as non-luteinizing granulosa
cells. P4 production by non-luteinizing granulosa cells was not affected by hypoxia (24 h at 10% and 5% O2), while
P4 production by granulosa cells treated with insulin in combination with forskolin was significantly increased under hypoxia
(24 h at 10% and 5% O2). Because hypoxia affected P4 production by the luteinizing granulosa cells but not by the
non-luteinizing granulosa cells, hypoxia seems to promote P4 production during, rather than before, luteinization. In the
cells treated with insulin in combination with forskolin, mRNA and protein expression of steroidogenic acute regulatory
protein (StAR) and protein expression of 3β-hydroxysteroid dehydrogenase (3β-HSD) increased under 10% O2, while
mRNA and protein expressions of key protein and enzymes in P4 biosynthesis did not increase under 5% O2. The
overall results suggest that hypoxia plays a role in progressing and completing the luteinization by enhancing P4 production
through StAR as well as 3β-HSD expressions in the early time of establishing the corpus luteum. 相似文献
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We examined the effect of grazing during the growing phase on plasma glucose and insulin behavior at the end of the growing phase and at the early stage of the subsequent fattening phase in beef steers. From 13 to 45 weeks of age (growing phase), crossbred beef steers were grazed with minimal supplement (group G: n = 5) or housed while being fed on hay and concentrate (group H: n = 5). Following this phase, both groups were housed for finishing (fattening phase). At the end of the growing phase, group G showed faster plasma glucose disappearance after intravenous glucose infusion, with a smaller plasma insulin response, compared with group H. At the third week of the fattening phase, group G still showed higher glucose tolerance, although they experienced abrupt changes in nutritional and environmental factors. The results suggest that grazing during the growing phase probably improves the glucose tolerance and insulin response to glucose infusion in steers compared with animals that were housed during the corresponding period, and the improved properties may persist at least a few weeks after the commencement of fattening. 相似文献
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Takanori NISHIMURA Ayaka TANEICHI Jun-ichi WAKAMATSU Akihito HATTORI 《Animal Science Journal》2003,74(5):399-405
The effect of skeletal muscle decorin on collagen fibrillogenesis was investigated, in order to provide background for understanding the functions of decorin in skeletal muscle. The self‐assembly of type I and III collagen with the addition of decorin or the core protein of decorin from bovine neonatal skeletal muscle was monitored using a spectrophotmeter. Time course changes in the absorbance of collagen solutions showed typical sigmoidal curves composed of three phases. The time of the initial phase was not different between the collagen solution with decorin and that without decorin. The increase rate of the absorbance in the second phase decreased with concentration of decorin added in collagen solutions. Similar effects on fibrillogenesis of type I and III collagens were observed when the core protein of decorin was added in collagen solutions. These results suggest that regulation of collagen fibrillogenesis by decorin depends on its core protein. The networks of reconstructed collagen fibrils with decorin were looser than those without decorin. Bovine skeletal muscle decorin could participate in the regulation of collagen fibrillogenesis and in the arrangement of collagen fibrils in the intramuscular connective tissue. 相似文献