ULTRASTRUCTURAL EVIDENCE FOR THE ENDOCRINE NATURE OF THE LATERAL ORGANS OF THE CATTLE TICK BOOPHILUS-MICROPLUS
ULTRASTRUCTURAL EVIDENCE FOR THE ENDOCRINE NATURE OF THE LATERAL ORGANS OF THE CATTLE TICK BOOPHILUS-MICROPLUS
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DOI：
10.1016/0040-8166(81)90020-3
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发表时间：
1981-01-01
期刊：
影响因子：
2.6
通讯作者：
BINNINGTON, K
中科院分区：
文献类型：
--
作者：
BINNINGTON, K
蜱B的侧部器官。microplus以前被认为具有神经血管功能。它们由腺细胞组成，腺细胞含有丰富的滑面内质网（SER）和高尔基体系统，但没有神经分泌物产生或释放的迹象。在整个SER和高尔基体中存在酸性磷酸酶活性，后者的主要功能可能是产生溶酶体酶。这些器官可能是内分泌腺，在充血的雌性中，可能分泌一种参与控制卵黄发生的激素。这些器官在进食方面比未进食的雄性更活跃，相关的功能可能是控制生殖器官的发育或精子发生。细胞中还存在包被囊泡、脂滴和微管。靠近高尔基体的包被囊泡可能是初级溶酶体;铁蛋白示踪剂显示，那些靠近外周的囊泡来自包被小凹。胞饮作用可能参与膜回收，但在没有胞吐作用证据的情况下，这似乎不太可能。与脊椎动物和昆虫的内分泌腺类似，侧部器官可以通过包被的囊泡吸收激素前体，储存在脂滴中并在SER中转化为激素。与其他富含SER的内分泌腺一样，侧部器官的激素或其他分泌产物的释放机制尚不确定。这两种类固醇，蜕皮激素和萜类，保幼激素，作为侧器官激素的可能候选人进行了讨论。
The lateral organs of the tick B. microplus were previously thought to have a neurohemal function. They consist of glandular cells which contain a rich system of smooth endoplasmic reticulum (SER) and Golgi but no indication of neurosecretory production or release. There is acid phosphatase activity throughout the SER and in Golgi and a major function of the latter may be the production of lysosomal enzymes. The organs probably are endocrine glands and in engorged females, may secrete a hormone involved in the control of vitellogenesis. The organs are more active in feeding than in unfed males and a related function could be in control of the development of genital organs or spermatogenesis. Also present in the cells are coated vesicles, lipid droplets and microtubules. Coated vesicles close to Golgi are probably primary lysosomes; those near the periphery are shown by ferritin tracer to arise from coated pits. Pinocytosis could be involved in membrane retrieval but, in the absence of evidence for exocytosis, this seems unlikely. By analogy with vertebrate and insect endocrine glands, the lateral organs may take up hormone precursor via coated vesicles for storage in lipid droplets and conversion to hormone in the SER. As in other SER-rich endocrine glands, the release mechanism for the hormone or other secretory product of the lateral organs is uncertain. Both the steroid, ecdysone and the terpenoid, juvenile hormone, are discussed as possible candidates for the lateral organ hormones.