Position in the evolution of reproductive endocrine of amphioxus,Branchiostoma belcheri |
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Authors: | Yongqiang Fang |
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Institution: | (1) Third Institute of Oceanography, SOA, 361005 Xiamen, China |
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Abstract: | This review summarizes the recent discoveries of many authors who found that in amphioxus Hatschek’s pit is capable of synthesizing
vertebrate gonadotropin-like substance, and that the content of gonadotropin-releasing hormone in the amphioxus’ body shows
a positive correlation with the reproductive cycle, and that the sex steroid hormone exists in gonads. Exogenous hormones
could promote gonadal development, maturation and reproductive activity in amphioxus. A possible implication might be that
the reproductive activity in amphioxus is regulated by reproductive hormones like vertebrate, indicating the existence of
primitive reproductive endocrine regulatory axis, brain vesicle-Hatschek’s pit-gonads axis, as compared with regulatory axis
of vertebrate. It will provide a new line for establishing the position of reproductive endocrine evolution in lancelet. |
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Keywords: | amphioxus (lancelet) Hatschek’ s pit reproductive endocrine evolution gonadotropin-releasing hormone gonadotropin sex steriod hormone |
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