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Hormonal effects on the contractile apparatus of the myometrium

✍ Scribed by Kelly, Robert E. ;Verhage, Harold G.

Publisher
Wiley (John Wiley & Sons)
Year
1981
Tongue
English
Weight
913 KB
Volume
161
Category
Article
ISSN
0002-9106

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✦ Synopsis

The effect of estradiol-17P (E,) and progesterone (P) on the structure of myofilaments of the smooth muscle of the myometrium of cats was studied by electron microscopy. Animals which had been ovariectomized for at least four weeks were divided into three treatment groups. Group I received no additional treatment. Group I1 animals were treated for 14 days with E,, and Group I11 animals were treated for 14 days with E, and then with E, and P. The smooth muscle of the uterus of Group I animals displayed a single array of thin ( < 10nm) filaments only. Group I1 animals displayed in all cases a double array of thick (14-16 nm) filaments, whereas Group I11 exhibited a single array of thin (6-8 nm) filaments only. These results suggest that E, induces assembly of thick filaments in ovariectomized cats while P promotes thick filament disassembly. I t -~

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