Proteomic analysis of seminal plasma in adolescents with and without varicocele

Capsule:
Normal semen analysis may not reflect important alterations in protein levels in the seminal plasma. A classic proteomics approach shows that unbalanced apoptosis may prevent normal spermatogenesis in the adolescent varicocele.

Authors:
Daniel Suslik Zylbersztejn, M.D., Ph.D., Cassio Andreoni, M.D., Ph.D., Paula Toni Del Giudice, M.Sc., Deborah Montagnini Spaine, Ph.D., Luciana Borsari, R.N., Gustavo H. M. F. Souza, Ph.D., Ricardo Pimenta Bertolla, D.V.M., Ph.D., Renato Fraietta, M.D., Ph.D.

Volume 99, Issue 1, Pages 92-98, January 2013

Abstract:

Objective:
To compare proteomic profiles of seminal plasma from adolescents with varicocele with changes in semen quality with those from adolescents with varicocele without seminal changes and from adolescents without varicocele.

Design:
Observational study.

Setting:
Patients in an academic research environment.

Patient(s):
Adolescents without varicocele (control group), adolescents with varicocele and normal semen quality (VNS group), adolescents with varicocele and abnormal semen quality (VAS group).

Intervention(s):
Two semen collections with one-week interval. Protein separation by twodimensional protein electrophoresis, analysis by gel densitometry, identification by mass spectrometry.

Main Outcome Measure(s):
Overexpressed proteins in each group, observed by increased densitometric signal in gels, and exclusively identified proteins in each group.

Result(s):
No differences were observed among the three groups regarding clinical parameters. In semen analysis, the VAS group presented lower sperm concentration, motility, and morphology compared with the VNS and control groups. Forty-seven protein spots of interest were submitted to mass spectrometry identification. Apoptosis regulation proteins were overexpressed in the VAS group, while spermatogenesis proteins were overexpressed in the VNS group. Controls presented proteins related to homeostasis.

Conclusion(s):
Changes in the proteomic profile of adolescents with varicocele and normal semen parameters (VNS group) indicate that normal semen analysis may not reflect alterations in proteins in seminal plasma. Implementation of proteomics will help characterize proteins identified in seminal plasma and will facilitate detection of new proteins associated with spermatogenesis and sperm function.

  • NicoGarrido

    Congratulations for your nice work.
    Proteomic techniques enable the analysis of several molecules in single experiments, permitting the retrieval of a huge amount of information, in order to answer well constructed research questions as yours.
    The more we know about sperm phisiology, the more seems that fertility or infertility status in some cases is not dependent of the total number of available motile sperm, but on these sperms molecular traits.
    Instead of analyzing seminal plasma contents, have you tried to analyze on the same clinical situations sperm protein extracts?
    I was wondering about the effect of varicocele on sperm cells
    thank you!

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