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Dye permeability and alkaline phosphatase activity of testicular capillaries in the postnatal rat

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Summary

Staining of testicular and epididymal tissues after intravenous, intraperitoneal or subcutaneous administration of a number of dyes was investigated in rats at different stages of postnatal development. After light green injections heavy staining of both testis and epididymis was visible to the naked eye in neonatal animals up to the age of 10 days, while in rats over 15 days old no appreciable staining of the testis could be seen, although the caput epididymis was strongly coloured. From 3–8 hours after subcutaneous acriflavine administration, the nuclei in the blood vessel walls of the testis, as well as the nuclei in the rete testis, tubuli efferentes and caput epididymis, fluoresced in all age groups. The nuclei of the interstitial and tubular cells were stained intensely until the age of 5 days. Thereafter the intensity gradually diminished until the age of 20 days, when no nuclear fluorescence was visible in the seminiferous tubules and even the interstitial nuclei fluoresced weakly or not at all.

The histochemical alkaline phosphatase activity of the testicular capillaries was studied by Gomori's method, using fresh and postfixed cryostat sections from postnatal rat testes. The testicular capillaries exhibited appreciable activity at the age of 10 days.

On the basis of the present and previous observations on the permeability of the testicular capillaries, the existence of a blood-testis barrier in the puberal and adult rat testis is suggested.

Development of the blood-testis barrier and the alkaline phosphatase activity of the testicular capillaries are suggested to reflect general vascular maturation at the beginning of puberty in the rat.

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  1. Department of Anatomy, University of Helsinki, Finland

    Martti Kormano

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Supported by grants from Yrjö Jahnsson's Foundation and P. O. Klingendahl Foundation.

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Kormano, M. Dye permeability and alkaline phosphatase activity of testicular capillaries in the postnatal rat. Histochemie 9, 327–338 (1967). https://doi.org/10.1007/BF00305816

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