EXOCYTOTIC SHEDDING AND GLIAL UPTAKE OF PHOTORECEPTOR MEMBRANE BY A SALTICID SPIDER
EXOCYTOTIC SHEDDING AND GLIAL UPTAKE OF PHOTORECEPTOR MEMBRANE BY A SALTICID SPIDER
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DOI：
10.1098/rspb.1979.0016
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发表时间：
1979-01-01
期刊：
影响因子：
--
通讯作者：
MAPLES, J
中科院分区：
文献类型：
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作者：
BLEST, AD;MAPLES, J
跳蛛前外侧眼的感受器具有成对的杆粒。横纹肌微绒毛的顶端与无色素的神经胶质突起相邻。光感受器膜在周转过程中通过一个迄今未描述的过程丢失：单个微绒毛在其尖端延长，逐渐变细，并被神经胶质膜中相应的包被的内吞凹接收。陷窝分离为被膜囊泡，囊泡内有连贯的微绒毛片段，失去被膜并作为无序的膜碎屑积聚在胶质细胞突起中。一些微绒毛膜在局部内吞作用之前解体，并且似乎通过内陷进入远离亲本横纹肌的胶质臂，内陷是内吞裂隙或管池系统，但其确切性质尚不清楚。没有光感受器膜通过胞饮作用进入受体细胞质而丢失。简要讨论了该系统的行为和脱落的脊椎动物感光膜的吞噬作用之间的类比。
Receptors in the anterior lateral eyes of salticid spiders possess paired rhabdomeres. The tips of the rhabdomeral microvilli lie adjacent to nonpigmented glial processes. Photoreceptor membrane is lost during turnover by a hitherto undescribed process: individual microvilli lengthen at their tips, taper and are received by corresponding, coated endocytotic pits in the glial membrane. Pits detach as coated vesicles with coherent fragments of microvilli within them, lose their coats and accumulate in the glial processes as disorderly membranous detritus. Some microvillus membrane disintegrates before local endocytosis, and appears to get into the glial arms distant from the parent rhabdomere by invaginations which are either endocytotic clefts or a tubulo-cisternal system, but whose precise nature is not clear. No photoreceptor membrane is lost by pinocytosis into the receptor cytoplasm. Analogies between the behavior of this system and the phagocytosis of shed vertebrate photoreceptor membrane are briefly discussed.