Spontaneous activity in vitro of the uterine horns of unilaterally pregnant rats. Relations with glycogen and triglycerides levels.
Effects of the placental implantation on the in vitro spontaneous contractile activity of uterine strips incubated in a glucose-free KRB medium, and its relationship with the glycogen and triglycerides tissue levels, have been analysed using unilaterally pregnant rats. The spontaneous activity increased with pregnancy duration, both in the implantation zone (Impl) and the interembryonic segment (Inter) of the pregnant horn. It increased in the contralateral sterile horn (SH) also. Activity was significantly greater in SH and Inter than in Impl, at the same stage of pregnancy. Uterine glycogen, but not triglycerides, appeared to be the substrate used to sustain contractile activity, as its concentration was greater in Impl, the relatively quiescent zone.
Sterin
A B
AB
Cátedra de Fisiología, Facultad de Odontología, Universidad Nacional de Córdoba, Argentina.
Linares
J A
JA
Goldraij
A
A
D000818:Animals; D005260:Female; D006003:Glycogen / Q000378:metabolism*; D066298:In Vitro Techniques; D007537:Isometric Contraction / Q000502:physiology; D011247:Pregnancy; D011270:Pregnancy, Animal / Q000378:metabolism / Q000502:physiology*; D051381:Rats; D014280:Triglycerides / Q000378:metabolism*; D014590:Uterine Contraction / Q000502:physiology*; D014599:Uterus / Q000378:metabolism
D014280:Triglycerides; D006003:Glycogen