THE ULTRASTRUCTURE OF THE LARVAL MALPIGHIAN TUBULES OF A SALINE-WATER MOSQUITO
THE ULTRASTRUCTURE OF THE LARVAL MALPIGHIAN TUBULES OF A SALINE-WATER MOSQUITO
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DOI：
10.1016/0040-8166(82)90064-7
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发表时间：
1982-01-01
期刊：
影响因子：
2.6
通讯作者：
SATIR, P
中科院分区：
文献类型：
--
作者：
BRADLEY, TJ;STUART, AM;SATIR, P
海水蚊A.用光学显微镜和电子显微镜检查带喙。肾小管包含2种细胞类型：原代细胞和星状细胞。原代细胞的特征在于它们的大小（70 μ m × 100 μ m）。70 μ m × 70 μ m 10 μ m）和丰富的细胞内膜结合晶体。在原代细胞的腔表面上发现两种类型的微绒毛：含有核心微丝和内质网延伸的小微绒毛，和较大的微绒毛（约长度为1 μ m），其除了上述组分之外，还包含沿其整个长度沿着的波纹。这两种微绒毛类型都有丰富的球内衬微绒毛膜的细胞质表面。这些节结通常存在于昆虫的离子运输组织中，Harvey（1980）将其命名为portasomes。这些结构在离子运输和线粒体定位的可能作用进行了讨论。星状细胞比原代细胞小得多，并且缺乏细胞内晶体。它们的微绒毛也更小（约0.6μ m长），并且不含内质网、线粒体或球。在盐水蚊幼虫中发现的细胞类型，A。taeniorhynchus，与A.埃及伊蚊，表明盐水蚊子幼虫运输Mg 2+和SO 42-的独特能力与另外的细胞类型的存在无关。
The larval Malpighian tubules of the saline-water mosquito A. taeniorhynchus were examined using light and electron microscopy. The tubules contain 2 cell types: primary cells and stellate cells. Primary cells are characterized by their size (70 .mu.m .times. 70 .mu.m .times. 10 .mu.m) and an abundance of intracellular membrane-bound crystals. Two types of microvilli are found on the luminal surface of the primary cells: small microvilli containing core microfilaments and extensions of endoplasmic reticulum, and larger microvilli (.apprxeq. .mu.m in length) which in addition to the above components contain a mitochondrion along their entire length. Both microvillar types have abundant knobs lining the cytoplasmic surface of the microvillar membrane. These knobs, which are often found in insect ion transporting tissues, have been termed portasomes by Harvey (1980). The possible role of these structures in ion transport and mitochondrial positioning is discussed. The stellate cells are much smaller than the primary cells, and lack intracellular crystals. Their microvilli are smaller as well (.apprxeq. 0.6 .mu.m in length) and contain no endoplasmic reticulum, mitochondria or knobs. The cell types found in the saline-water mosquito larva, A. taeniorhynchus, are identical to those found in A. aegypti, indicating that the unique capacity of saline-water mosquito larvae to transport Mg2+ and SO42- is not associated with the presence of an additional cell type.