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Lack of association between smoking and DNA fragmentation in the spermatozoa
of normal men.
Sergerie M, Ouhilal S, Bissonnette F, Brodeur J, Bleau G
Andrology Laboratory, Centre hospitalier de l'Universite de Montreal (CHUM)
- Hopital Saint-Luc, Quebec, Canada.
Male factor infertility patients can have anomalies in their sperm nuclei,
displaying high levels of loosely packaged chromatin and damaged DNA. The
primary objectives of this study were to compare the extent of DNA
fragmentation in the spermatozoa of healthy light and heavy smokers versus
non-smokers, and to investigate its correlation with concentrations of the
smoking markers cotinine and cadmium.
A secondary objective was to compare the concentrations of blood cadmium
and serum cotinine with corresponding concentrations in seminal plasma.
Ninety-seven healthy male volunteers were divided into three groups:
non-smokers, light and heavy smokers. There was no difference between the
three groups with respect to age, number of ejaculations per week, serum
testosterone concentration, and parameters of semen analysis.
The percentages of DNA fragmentation in spermatozoa were not statistically
different in the heavy smokers (12.11%), light smokers (11.66%) and
non-smokers (20.41%). Serum and seminal plasma concentrations of cotinine were
significantly higher in heavy smokers compared with the other groups (P <
0.0001). Median values for blood cadmium concentration were higher in heavy
smokers (4.50 microg/l) than in light smokers (0.20 microg/l) and non-smokers
(0.20 microg/l) (P < 0.001). Cadmium concentration in seminal plasma was
significantly higher in heavy smokers (0.20 microg/l) than in light smokers
(0.10 microg/l) and non-smokers (0. 10 microg/l) (P < 0.05). In summary,
our results indicate no association between smoking and DNA fragmentation in
the spermatozoa of healthy men.