Nickel nitrate: A new junction permeability tracer for the study of the blood‐testis barrier
作者:
Juan C. Cavicchia,
Fabio L. Sacerdote,
Luis A. Gutierrez,
期刊:
Microscopy Research and Technique
(WILEY Available online 1992)
卷期:
Volume 20,
issue 1
页码: 34-42
ISSN:1059-910X
年代: 1992
DOI:10.1002/jemt.1070200105
出版商: Wiley Subscription Services, Inc., A Wiley Company
关键词: Intercellular tracer;Lanthanum;Testis;Galea
数据来源: WILEY
摘要:
AbstractWith the purpose of evaluating a new intercellular tracer, nickel‐K ferrocyanide, we compared results yielded by lanthanum with information provided by nickel. This was done in the seminiferous epithelium of Holtzman rats of several postnatal ages and in a wild local seasonal breederGalea musteloides. Tissues were studied with transmission electron microscopy and freezefracture replications. Nickel tracing proved to delineate cell contours more intensely and less interruptedly than lanthanum. With regard to seasonal variations in adult galea, the limits of the barrier were similar to those described in other mammals: spermatogonia, preleptotene, and leptotene spermatocytes were surrounded by the tracer in the basal compartment. The zygotenepachytenes were contained in the lumenal compartment and tracers were stopped at the inter—Sertoli cell tight junctions. During the inactive spermatogenic phase in winter, the seminiferous epithelium contained Sertoli cells and occasional germ cells, never beyond the spermatocyte stage. The tracer filled intercellular spaces, indicating that the barrier was incompetent. Some resting germ cells showed nuclear hyperchromasia, karyolysis, organelle loss, cell shrinkage, and cell fusion leading to a multinucleated cells. The inter‐Sertoli tight junctions were scanty and had randomly oriented and discontinuous junctional strands. Moreover, inter—Sertoli cell gap junctions proliferated. During the active spermatogenic phase in summer, junctions were numerous. Their junctional strands were parallel to each other, and con
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