Mapping the testicular interstitial fluid proteome from normal rats.
Communication between the testicular somatic (Sertoli, Leydig, peritubular myoid, macrophage) and germ cell types is essential for sperm production (spermatogenesis), but the communicating factors are poorly understood. We reasoned that identification of proteins in the testicular interstitial fluid (TIF) that bathes these cells could provide a new means to explore spermatogenic function. The aim of this study was to map the proteome of TIF from normal adult rats. Low-abundance proteins in TIF were enriched using ProteoMiner beads and identified by MALDI-MS/MS, recognizing 276 proteins. Comparison with proteomic and genomic databases showed these proteins originated from germ cells, somatic cells (Sertoli, peritubular myoid, Leydig), and blood plasma. In silico analysis revealed homologues of >80% TIF proteins in the human plasma proteome, suggesting ready exchange between these fluids. Only 36% of TIF proteins were common with seminiferous tubule fluid that transports mature spermatids to the epididymis, indicating these two fluids are quite different. This TIF proteome provides an important new resource for the study of intercellular communication in the testis.
Hudson Institute of Medical Research, Clayton, Victoria, Australia. peter.stanton@hudson.org.au.|Department of Molecular and Translational Science, Monash University, Clayton, Victoria, Australia. peter.stanton@hudson.org.au.
Peter G
PG
Stanton
Hudson Institute of Medical Research, Clayton, Victoria, Australia.|Department of Molecular and Translational Science, Monash University, Clayton, Victoria, Australia.
Caroline F H
CF
Foo
Hudson Institute of Medical Research, Clayton, Victoria, Australia.|Department of Molecular and Translational Science, Monash University, Clayton, Victoria, Australia.
Adam
A
Rainczuk
Hudson Institute of Medical Research, Clayton, Victoria, Australia.|Department of Molecular and Translational Science, Monash University, Clayton, Victoria, Australia.|Epworth Research Institute, Epworth Healthcare, Richmond, Victoria, Australia.
Andrew N
AN
Stephens
Bruker Pty Ltd, Preston, Victoria, Australia.
Mark
M
Condina
Hudson Institute of Medical Research, Clayton, Victoria, Australia.|Department of Molecular and Translational Science, Monash University, Clayton, Victoria, Australia.
Liza
L
O'Donnell
Department of Urology, Paediatric Urology and Andrology, Justus Liebig University, Giessen, Germany.
Wolfgang
W
Weidner
Department of Urology, Ishikawa Hospital, Himeji, Japan.
Tomomoto
T
Ishikawa
MRC Centre for Reproductive Health, University of Edinburgh, Edinburgh, United Kingdom.
Lyndsey
L
Cruickshanks
MRC Centre for Reproductive Health, University of Edinburgh, Edinburgh, United Kingdom.
Lee B
LB
Smith
Hudson Institute of Medical Research, Clayton, Victoria, Australia.|Department of Molecular and Translational Science, Monash University, Clayton, Victoria, Australia.
Robert I
RI
McLachlan
D000818:Animals; D015153:Blotting, Western; D004591:Electrophoresis, Polyacrylamide Gel; D045604:Extracellular Fluid / Q000737:chemistry*; D008297:Male; D020543:Proteome / Q000032:analysis*; D040901:Proteomics; D017207:Rats, Sprague-Dawley; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization; D053719:Tandem Mass Spectrometry; D013737:Testis / Q000737:chemistry*
D020543:Proteome
Animal proteomics; Germ cell; Intercellular communication; MS; Sertoli cell; Spermatogenesis