title: Changing P2X receptor localization on maturing sperm in the epididymides of mice, hamsters, rats, and humans: a preliminary study.
abstract: OBJECTIVE
  To study using immunohistochemistry the localization of P2X receptor subtypes on the head of immature sperm in the human, mouse, hamster, and rat caput epididymidis.
  
  
  METHODS
  Basic research.
  
  
  METHODS
  University-based hospital.
  
  
  METHODS
  Three human epididymides were obtained from patients undergoing orchidectomy for metastatic prostate cancer.
  
  
  METHODS
  P2X(1), P2X(2), P2X(3), and P2X(4) receptor immunolocalization on sperm.
  
  
  RESULTS
  In the present study, P2X(1,2, and 3) receptor localization was immunohistochemically demonstrated on the head of immature sperm in the human, mouse, hamster, and rat caput epididymidis. P2X(4) receptor immunostaining was also observed on the head of sperm in the caput epididymidis of mice, hamsters, and humans, but not rats. There was a subsequent loss of receptor staining on sperm in the cauda epididymidis, except in humans where staining of P2X(4) receptors persisted. Comparision with peanut agglutinin (PNA) binding studies suggested the P2X receptors were located on the acrosome membrane. P2X(5-7) receptors were examined but found to be absent.
  
  
  CONCLUSIONS
  The change in localization of receptor subtypes is coincidental with the functionally essential morphologic and maturational changes seen in sperm as they travel through the epididymis, and is suggestive of a role for purinergic signaling in sperm maturation and possibly fertility.
authors.affiliation: Autonomic Neuroscience Centre, Royal Free and University College Medical School, Rowland Hill Street, London NW3 2PF, United Kingdom.
authors.forename: Frederick C L
authors.initials: FC
authors.lastname: Banks
authors.forename: Robert C
authors.initials: RC
authors.lastname: Calvert
authors.forename: Geoffrey
authors.initials: G
authors.lastname: Burnstock