The olfactory system of the tammar wallaby is developed at birth and directs the neonate to its mother's pouch odours
The olfactory system of the tammar wallaby is developed at birth and directs the neonate to its mother's pouch odours
复制标题
DOI：
10.1530/rep-09-0145
复制
发表时间：
2009-11-01
期刊：
影响因子：
3.8
通讯作者：
Renfree, Marilyn B.
中科院分区：
文献类型：
--
作者：
Schneider, Nanette Y.;Fletcher, Terrence P.;Renfree, Marilyn B.
袋鼠和沙袋鼠在出生时，高度发育的新生幼仔在没有帮助的情况下从泌尿生殖道口爬到乳头。负向地性对于最初爬到育儿袋开口是重要的，但是不知道随后引导新生儿向下到乳头的信号。在这里，我们表明，新生tammar小袋鼠（Macropus eugenii）的嗅觉器官检测气味。主要嗅觉系统和犁鼻器（VNO）在出生时就已发育。对G（o α）-蛋白免疫阳性的主嗅上皮的受体细胞投射到三层主嗅球（MOB）。VNO的受体上皮含有G蛋白免疫阳性细胞，并具有嗅球样结构。VNO连接到两个MOB之间的区域。接下来，使用功能测试，我们表明，新生儿可以响应气味从他们的母亲的邮袋。当给新生儿选择浸有育儿袋气味的拭子或盐水拭子时，他们选择含有母亲育儿袋分泌物的拭子的频率明显更高（P
In kangaroos and wallabies at birth the highly altricial newborn young climbs unassisted from the urogenital opening to the teat. Negative geotropism is important for the initial climb to the pouch opening, but nothing is known of the signals that then direct the neonate downwards to the teat. Here we show that the newborn tammar wallaby (Macropus eugenii) has the olfactory apparatus to detect smell. Both the main olfactory system and vomeronasal organ (VNO) are developed at the time of birth. Receptor cells of the main olfactory epithelium immunopositive for G(o alpha)-protein project to the three layered main olfactory bulb (MOB). The receptor epithelium of the VNO contains G-protein immunopositive cells and has olfactory knob-like structures. The VNO is connected to an area between the two MOBs. Next, using a functional test, we show that neonates can respond to odours from their mother's pouch. When neonatal young are presented with a choice of a pouch-odour-soaked swab or a saline swab, they choose the swab with their mother's pouch secretions significantly more often (P