Aromatase and estrogen receptors in male reproduction - PubMed
- ️Sun Jan 01 2006
Review
. 2006 Feb 26;246(1-2):65-8.
doi: 10.1016/j.mce.2005.11.021. Epub 2006 Jan 6.
Affiliations
- PMID: 16406261
- DOI: 10.1016/j.mce.2005.11.021
Review
Aromatase and estrogen receptors in male reproduction
Serge Carreau et al. Mol Cell Endocrinol. 2006.
Abstract
Aromatase is a terminal enzyme which transforms irreversibly androgens into estrogens and it is present in the endoplasmic reticulum of numerous tissues. We have demonstrated that mature rat germ cells express a functional aromatase with a production of estrogens equivalent to that of Leydig cells. In humans in addition to Leydig cells, we have shown the presence of aromatase in ejaculated spermatozoa and in immature germ cells. In most tissues, high affinity estrogen receptors, ERalpha and/or ERbeta, mediate the role of estrogens. Indeed, in human spermatozoa, we have successfully amplified ERbeta mRNA but the protein was not detectable. Using ERalpha antibody we have detected two proteins in human immature germ cells: one at the expected size 66 kDa and another at 46 kDa likely corresponding to the ERalpha isoform lacking exon 1. In spermatozoa only the 46 kDa isoform was present, and we suggest that it may be located on the membrane. In addition, in men genetically deficient in aromatase, it is reported that alterations of spermatogenesis occur both in terms of the number and motility of spermatozoa. All together, these observations suggest that endogenous estrogens are important in male reproduction.
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