Maternal recognition of pregnancy in marsupials.

M B Renfree
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引用次数: 47

Abstract

Pregnancy in kangaroos and wallabies (macropodid marsupials) induces multiple unilateral responses in the reproductive system that override those related to proximity to the single corpus luteum on one ovary or to the follicle on the contralateral ovary. This situation is in contrast to most other non-macropodid marsupials, in which the responses are dependent on the corpus luteum. There is now good evidence that these unilateral responses in macropodids are controlled by the feto-placental unit acting locally to stimulate the endometrium and myometrium. Pregnancy also influences the duration of the oestrous cycle and maternal behaviour. The stimuli responsible for these effects probably include paracrine, endocrine and mechanical stimuli resulting from uterine stretch. Taken together, these unilateral responses demonstrate that there is a refined maternal recognition of pregnancy in at least the macropodid marsupials.
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有袋动物对怀孕的母体识别。
袋鼠和小袋鼠(大足有袋类动物)的怀孕在生殖系统中引起多重单侧反应,这些反应超越了与靠近单个卵巢黄体或靠近对侧卵巢卵泡有关的反应。这种情况与大多数其他非大足类有袋动物相反,它们的反应依赖于黄体。现在有充分的证据表明,大足类动物的这些单侧反应是由胎儿-胎盘单位局部刺激子宫内膜和子宫肌层控制的。怀孕还会影响发情周期的持续时间和母亲的行为。造成这些影响的刺激可能包括旁分泌、内分泌和子宫拉伸引起的机械刺激。综上所述,这些单方面的反应表明,至少在大足类有袋动物中,母体对怀孕有一种精细的识别。
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