Molecular Human Reproduction, Vol 4, 235-242, Copyright © 1998 by Oxford University Press
K Williams, J Frayne, EA McLaughlin and L Hall
Mammalian spermatozoa are particularly susceptible to the deleterious
effects of reactive oxygen species and lipid peroxidation, which ultimately
lead to impaired fertility. A number of enzymes are present in the male
reproductive tract which may play a role in preventing oxidative damage; in
particular, the epididymis is the site of synthesis and secretion of large
amounts of extracellular superoxide dismutase (eSOD). In order to study the
distribution of eSOD in the male reproductive tract, and distinguish it
from other related superoxide dismutase isoenzymes (e.g. cytosolic SOD),
polyclonal antisera have been raised against a recombinant human eSOD
fusion protein, expressed in bacterial cells. This protein was expressed
from a synthetic gene fragment, using preferred Escherichia coli codons,
designed to overcome the problems associated with the high guanine+cytosine
content of the natural human eSOD transcript. Using this antiserum, eSOD
can be readily detected in a range of human reproductive tissues as well as
in human seminal plasma. However, the presence of similar levels of eSOD in
the seminal plasma of vasectomized men (probably of prostatic origin)
precludes its use as a simple diagnostic indicator of eSOD activity levels
in the epididymis.
JOURNAL ARTICLE
Expression of extracellular superoxide dismutase in the human male reproductive tract, detected using antisera raised against a recombinant protein
Department of Biochemistry, University of Bristol, School of Medical Sciences, UK.
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