Journal of Comparative Physiology A

, Volume 193, Issue 1, pp 21–34

Expression of the G-protein α-subunit gustducin in mammalian spermatozoa

Authors

  • Johanna Fehr
    • Department of Pharmacology and ToxicologyPhilipps-University Marburg
  • Dorke Meyer
    • Department of Pharmacology and ToxicologyPhilipps-University Marburg
  • Patricia Widmayer
    • Institute of PhysiologyUniversity of Hohenheim
  • Heike Claudia Borth
    • Department of Pharmacology and ToxicologyPhilipps-University Marburg
  • Frauke Ackermann
    • Department of Pharmacology and ToxicologyPhilipps-University Marburg
  • Beate Wilhelm
    • Department of Anatomy and Cell BiologyPhilipps-University Marburg
  • Thomas Gudermann
    • Department of Pharmacology and ToxicologyPhilipps-University Marburg
    • Department of Pharmacology and ToxicologyPhilipps-University Marburg
Original Paper

DOI: 10.1007/s00359-006-0168-8

Cite this article as:
Fehr, J., Meyer, D., Widmayer, P. et al. J Comp Physiol A (2007) 193: 21. doi:10.1007/s00359-006-0168-8

Abstract

Although chemotaxis has been proposed to guide sperm to egg throughout the animal kingdom, sperm attractants released from mammalian eggs have not been identified. Since the G protein subunit α-gustducin is accepted as a marker of chemosensitive cells, attempts were made to explore whether α-gustducin is also expressed in spermatozoa of mammals. Immunohistochemical approaches using an anti-α-gustducin-specific antibody revealed the most intense immunoreactivity in differentiating spermatids. Further evidence for the α-gustducin expression was obtained analyzing testicular and sperm-derived tissue preparations in western blot analyses. To elucidate whether α-gustducin is retained in mature spermatozoa, epididymal mouse and rat sperm were subjected to immunocytochemistry as well as immunogold electron microscopy. A specific staining was obtained within the circumference of the midpiece-localized mitochondria, on the axoneme and the outer dense fibers surrounding the microtubules of this region, whereas no labeling was detectable in the end piece regions. The analysis of ejaculated bovine and human sperm revealed a comparable segmental distribution pattern for α-gustducin. Although a possible function for α-gustducin has yet to be determined, the axonemal-associated localization within the midpiece and principal piece of different mammalian spermatozoa raises the possibility that this G protein α-subunit may process intracellular signals controlling sperm motility.

Keywords

α-GustducinG proteinSpermatozoaSignal transductionMotility

Abbreviations

cAMP

3′,5′-Cyclic adenosine monophosphate

cGMP

Cyclic guanosine 5′-monophosphate

FITC

Fluorescein isothiocyanate

PDE

Phosphodiesterase

PLC

Phospholipase C

SCC

Solitary chemosensory cells

Copyright information

© Springer-Verlag 2006