Acute epididymitis induces alterations in sperm protein composition

Capsule:
A single episode of acute epididymitis is associated with significant alterations in sperm protein composition, with several molecules known to be involved in sperm maturation, function, and fertility.

Authors:
Adrian Pilatz, M.D., Guenter Lochnit, Ph.D., Srikanth Karnati, Ph.D., Agnieszka Paradowska-Dogan, Ph.D., Tali Lang, Ph.D., Dirk Schultheiss, M.D., Hans-Christian Schuppe, M.D., Hamid Hossain, M.D., Eveline Baumgart-Vogt, Ph.D., Wolfgang Weidner, M.D., Florian Wagenlehner, M.D.

Volume 101, Issue 6, Pages 1609–1617.e5

Abstract:

Objective:
To use a proteomic approach to evaluate possible postinflammatory alterations in the protein composition of motile sperm in patients 3 months after acute epididymitis.

Design:
Prospective case-control study.

Setting:
University medical school research laboratory.

Patient(s):
Eight patients 3 months after acute unilateral epididymitis and 10 healthy controls.

Intervention(s):
None.

Main Outcome Measure(s):
Proteome analysis of sperm samples collected by swim-up from control and acute epididymitis patients analyzed by two-dimensional gel electrophoresis and subsequent protein identification by matrix-assisted laser desorption/ionization–time-of-flight (MALDI-TOF) mass spectrometry; immunofluorescence staining for mitochondrial ATP synthase subunit β (ATP5B), α-tubulin (TUBA1A), and tubulin-β2c (TUBB4B) for validation purposes.

Result(s):
Proteome analysis identified 35 proteins in sperm from epididymitis patients that were down-regulated, irrespective of subcellular localization and biologic function. Furthermore, immunofluorescence microscopy confirmed ATP5B, TUBA1A, and TUBB4B were less abundantly expressed in epididymitis samples compared with controls.

Conclusion(s):
Despite normal semen parameters observed by conventional semen analysis in patients after epididymitis, significant changes to sperm protein composition were observed. These changes may be implicated as additional factors contributing to subfertility/infertility in men after episodes of epididymitis.

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