Rasweiler J J
Department of Obstetrics and Gynecology, Cornell University Medical College, New York, New York 10021.
J Exp Zool Suppl. 1990;4:210-2. doi: 10.1002/jez.1402560446.
The reproductive biology of the black mastiff bat has been examined using animals maintained in a laboratory colony. Ovulation was found to be spontaneous and occurred only from the right ovary. The corpora lutea appeared to be functional, and decidual reactions developed in the uterus during the luteal phase of the cycle even in the absence of an implanting blastocyst. At the end of nonpregnant, ovulatory cycles much of the endometrium became necrotic and was desquamated with associated bleeding. In the event of pregnancy only a single blastocyst implanted in the right uterine horn, and the discoidal chorioallantoic placenta then developed at the cranial end of that horn. This was preceded by the development of an unusual vascular tuft in the endometrium in that region. The endothelial cells of the tuft vessels became hypertrophied during early pregnancy and developed more prominent basal laminae. Trophoblast then grew preferentially around these vessels. These observations suggest that factors secreted by endometrial endothelial cells and incorporated at least in part into their basal laminae may play a central role in controlling early trophoblastic growth during the morphogenesis of the discoidal chorioallantoic placenta in this bat.
已利用饲养在实验室群体中的动物对黑獒蝠的生殖生物学进行了研究。发现排卵是自发的，且仅发生于右侧卵巢。黄体似乎具有功能，即使在没有植入囊胚的情况下，子宫在周期的黄体期也会出现蜕膜反应。在非妊娠排卵周期结束时，大部分子宫内膜坏死并伴有相关出血而脱落。若发生妊娠，只有一个囊胚植入右侧子宫角，然后盘状绒毛膜尿囊胎盘在该子宫角的头端发育。在此之前，该区域的子宫内膜会形成一个异常的血管丛。妊娠早期，丛状血管的内皮细胞肥大，基膜更明显。然后滋养层细胞优先围绕这些血管生长。这些观察结果表明，子宫内膜内皮细胞分泌并至少部分整合到其基膜中的因子，可能在这种蝙蝠盘状绒毛膜尿囊胎盘形态发生过程中控制早期滋养层细胞生长方面发挥核心作用。
