ORGANIC BINDING OF IODINE IN THE ENDOSTYLE OF CIONA-INTESTINALIS
ORGANIC BINDING OF IODINE IN THE ENDOSTYLE OF CIONA-INTESTINALIS
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DOI：
10.1038/177432a0
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发表时间：
1956-01-01
期刊：
影响因子：
64.8
通讯作者：
FRANCHI, LL
中科院分区：
文献类型：
--
作者：
BARRINGTON, EJW;FRANCHI, LL
人们普遍认为，原索动物的内样式与弹壳幼虫的内样式同源，因此是甲状腺的前身，众所周知，当该动物变态为成年七鳃鳗时，甲状腺是从弹壳动物的内样式发育而来的。然而，这种解释受到了批评，因为最近的研究已经确定了 ammocoœte1,2 内花柱中甲状腺功能的存在，但未能证明被囊内花柱中碘的任何有机结合，尽管这已被证明发生在 Perophora annectens3 的匍匐隔中。这些发现被认为表明内柱“可能不是甲状腺的同源物”3，并且“不幸的是，环口幼虫的细长咽下腺囊......已被称为‘内柱’”4。
IT has very commonly been supposed that the endostyle of the Protochordata is homologous with that of the ammocoete larva and is thus the forerunner of the thyroid gland, which is well known to develop from the ammocœte's endostyle when this animal metamorphoses into the adult lamprey. This interpretation has, however, come under criticism as a result of recent investigations which have established the existence of thyroidal function in the endostyle of the ammocœte1,2, but have failed to demonstrate any organic binding of iodine in the endostyle of the Tunicata, although this has been shown to occur in the stolonic septum ofPerophora annectens3. These findings have been held to indicate that the endostyle “may not be the homologue of the thyroid”3, and that “it is probably unfortunate that the elongated subpharyngeal glandular sac of cyclostome larvae … has come to be known as ‘endostyle’”4.