PMID: 9439011Jan 1, 1997Paper

Different embryotoxic effect of vitamin A and B-carotene detected in the chick embryo

Acta Chirurgiae Plasticae
M PeterkaZ Likovský

Abstract

Teratogenicity of vitamin A was firstly detected in experimental animals in 1953. Nearly 30 years later, teratogenicity of vitamin A analogue-isotretinoin was reported in humans. Isotretinoin induces serious birth defects of craniofacial and central nervous system, cardiovascular system and thymic malformations--in about 25% of babies exposed during the first trimester of their prenatal development. The biological interconversion of isotretinoin to vitamin A is known. That is why later epidemiological studies focused on high vitamin A intake in pregnant woman: Women who use daily vitamin A supplements during early pregnancy have approximately a two-fold increased risk of giving birth to a malformed baby. On the basis of these data, replacement of vitamin A has been recommended with its natural precursor B-carotene which is supposed to be more safe for pregnant woman due to its limited absorption from intestine. Aim of the present paper was to test a possible direct embryotoxic effect (i.e. lethality + teratogenicity) of B-carotene in chick embryos and to compare these results with known embryotoxicity of vitamin A in the same experimental model. Single subgerminal or intaamniotic injection of vitamin A or B-carotene within day ...Continue Reading

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