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KMID : 0364219780210020043
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Korean Journal of Zoology
1978 Volume.21 No. 2 p.43 ~ p.58
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Effects of the Heavy Metal Pollution on the Primordial Germ Cells of Developing Amphibia
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Hah Jae-Chung
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Abstract
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Heavy metal treatment on the fertilized frog eggs before the first cleavage results in a quantitative alteration in the number of PGCs. The formation of PGCs is inhibited by a limited range of heavy metal during the early embryonic development. Total doses of lead above 70ppm and doses of cadmium above 4ppm result in a partial reduction of germ cells at the mitotically dormant stage. After this stage the germ cell number increases almost at the same rate as the untreated control tadpoles. In contrast, on mercury treated eggs, total doses above 0.8ppm cause more damage to germ cell formation. Their proliferation rate thereafter seems to be lower compared with the others. These facts seem to suggest that the heavy metal treatment on frog eggs prior to the first cleavage division is not highly effective in the complete elimination of PGCs in constrast with UV irradiation, even though cytolysis of the tissue occurs in the tadpoles.
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