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2016 ; 18
(2
): 282-91
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Proteomic signatures of infertile men with clinical varicocele and their
validation studies reveal mitochondrial dysfunction leading to infertility
#MMPMID26732106
Agarwal A
; Sharma R
; Samanta L
; Durairajanayagam D
; Sabanegh E
Asian J Androl
2016[Mar]; 18
(2
): 282-91
PMID26732106
show ga
To study the major differences in the distribution of spermatozoa proteins in
infertile men with varicocele by comparative proteomics and validation of their
level of expression. The study-specific estimates for each varicocele outcome
were combined to identify the proteins involved in varicocele-associated
infertility in men irrespective of stage and laterality of their clinical
varicocele. Expression levels of 5 key proteins (PKAR1A, AK7, CCT6B, HSPA2, and
ODF2) involved in stress response and sperm function including molecular
chaperones were validated by Western blotting. Ninety-nine proteins were
differentially expressed in the varicocele group. Over 87% of the DEP involved in
major energy metabolism and key sperm functions were underexpressed in the
varicocele group. Key protein functions affected in the varicocele group were
spermatogenesis, sperm motility, and mitochondrial dysfunction, which were
further validated by Western blotting, corroborating the proteomics analysis.
Varicocele is essentially a state of energy deprivation, hypoxia, and
hyperthermia due to impaired blood supply, which is corroborated by
down-regulation of lipid metabolism, mitochondrial electron transport chain, and
Krebs cycle enzymes. To corroborate the proteomic analysis, expression of the 5
identified proteins of interest was validated by Western blotting. This study
contributes toward establishing a biomarker "fingerprint" to assess sperm quality
on the basis of molecular parameters.