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Regular Article |
) Protein in the Adult Rat Testis Following Ischemic Injury Occurs Without an Increase in HIF-1 Messenger RNA Expression1
a Biology Department, Monmouth University, West Long Branch, New Jersey 07764
Hypoxia-inducible factor 1 (HIF-1) is a transcription factor composed of 
and ß subunits. Stabilized from proteasome degradation and activated by hypoxia, HIF-1 stimulates expression of hypoxia-sensitive genes that mediate oxygen homeostasis in many tissues. Our hypothesis is that HIF-1 is involved in the cellular response to hypoxia in the ischemic testis. Goals of this study were to determine if HIF-1 mRNA is expressed in the testis, epididymis, and accessory sex glands of adult Sprague-Dawley rats and to determine if HIF-1 mRNA and protein expression in the testis is affected by experimentally induced ischemia. Total RNA from reproductive organs of adult rats was analyzed by relative reverse transcription-polymerase chain reaction (RT-PCR) analysis. HIF-1 mRNA showed equal expression in testis, all segments of epididymis, ductus deferens, accessory sex glands, and penis. To examine the effects of ischemia on HIF-1 mRNA and protein expression in the testis, rats were subjected to unilateral testicular ischemia by placing a ligature around spermatic artery or ischemia-inducing experimental torsion and reperfusion. RT-PCR revealed that HIF-1 mRNA expression at all times of ischemic treatment and reperfusion was unchanged compared with normoxic controls. HIF-1 protein was detected by immunoblot analysis of nuclear protein extracts from normoxic testes. Steady-state levels of HIF-1 protein were stimulated by 15 min of ischemia and showed a 2-fold increase at 30 min and 1, 3, and 6 h. HIF-1 protein was also elevated by experimental torsion and reperfusion compared with normoxic controls. These results support the hypothesis that HIF-1 may play a role in the cellular response to hypoxia in the ischemic testis.
1 This work was supported by the Monmouth University Biology Department and a TriBeta Research Foundation Scholarship to D.J.F. This study was partially presented at the VIIth International Congress of Andrology in Montréal, Canada, June 2001.
2 Correspondence: Michael A. Palladino, Biology Department, Monmouth University, 400 Cedar Ave., West Long Branch, NJ 07764. FAX: 732 263 5243; mpalladi{at}monmouth.edu
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