産卵ウズラの卵胞における203Hgの輸送に関する電子顕微鏡的研究

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  • An Electron Microscopic Study on <SUP>203</SUP>Hg Transport in the Ovarian Tissue of Laying Japanese Quail
  • 産卵ウズラの卵胞における<SUP>203</SUP>Hgの輸送に関する電子顕微鏡的研究
  • サンラン ウズラ ノ ランポウ ニ オケル 203Hg ノ ユソウ ニ カンス

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It was reported that mercuric nitrate injected to laying quail bound withlipovitellin in their serum and tra?tsported into ovarian follicles int the form of mercurylipovitellin complex. In this work, to clarify the pathways) ccf the mercurial complexfrom ovarian circuratory system to the ovum, a localization of "Hg in the ovarian tissueof laying quail injected with "Hg-mercuric nitrate was investigated by electron micro-scopic autoradiography.The ovarian follicle of the quail was composed generally of six layers, i.e., theca externa, theca interna, basement membrane, follicular cell, vitellin mem[crane, and oocyte. In thetheca interna, in which the blood circulation is terminated, au[oradiographic grains XXCTCobserved around cell membrane arzd intercellular space. In the basement membrane thegrains were concentrated near the follicular cell which had marxy processes. Grains werevisible mainly on the surface of the process and concentrated in the area of interdigita[ionstructure. The process with grains extruded througla Ixhe vitellin membrane and projectedinto the oocyte by oocy[ic pinocytosis. In the oocyte, grains were detectable in xesiclescontaining granules and in the yollc spheres. The vesicles seemecl to have been originatedfrom t1?e processes.Although tlae results of the present study did not indicate directly the presence of themercury-lipovitellin complex in the follicular structure, the complex in the serum doesnot seem to be altered until being deposited in tlae oocyte. From the above-mentioneclobservations, therefore, the following pathway was proposed for the mercury-lipoxitellincomplex: The complexes leave the ovarian circulatory system attd pass through the inter-cellular space of the tlacca interna and the interfibrous space of the basement membrane.A cytoplasmic process containing the complex on its mcmbratteous structure is formedon the surface of the follicular cell, extruded through the pore structure of the vitellinmembrane, and projected into the oocyte by oocytic pinocytosis. Finall

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