The risk of using monoclonal or polyclonal commercial antibodies: controversial results on porcine sperm CD44 receptor identification

Manuel Alvarez-Rodriguez, Manel López-Bejar, Heriberto Rodriguez-Martinez

Research output: Contribution to journalArticleResearch

1 Citation (Scopus)

Abstract

© 2019 Blackwell Verlag GmbH Presence of the hyaluronan (hyaluronic acid, HA) receptor CD44 on spermatozoa has been difficult to pursue, mostly obeying to the use of different commercial mono- and/or polyclonal antibodies, often lacking proper controls. Here, we describe how the presence (Western blotting) and specific location (immunocytochemistry) of the CD44 receptor differs in ejaculated pig spermatozoa depending on the type of antibody and protocol used. While we were able to detect binding to spermatozoa and mark its presence in the sperm membrane, the use of blocking peptides clearly indicated that only the monoclonal antibody could confirm the specific presence and location of the CD44 receptor, whereas the polyclonal antibody was detecting multiple presumed CD44 isoforms or degraded proteins thus proving unspecific. These results call for strict protocols when attempting immunological determination of sperm membrane receptors.
Original languageEnglish
Pages (from-to)733-737
JournalReproduction in Domestic Animals
Volume54
DOIs
Publication statusPublished - 1 Apr 2019

Keywords

  • CD44 receptor
  • hyaluronan
  • monoclonal antibody
  • pig
  • polyclonal antibody
  • spermatozoa

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