Hemin induced heme oxygenase-1 over expression involves nuclear factor-E2 related factor-2, nuclear factor-kappaB and extracellular regulated kinase: an experimental study in a testicular torsion-detorsion rodent model.

Abstract

PURPOSE:

Nrf2 (nuclear factor-E2 related factor-2), nuclear factor-kappaB and mitogen-activated protein kinase, including extracellular regulated kinase, c-jun N-terminal kinase and p38 mitogen-activated protein kinase, are crucial for signal transduction. We previously reported that heme oxygenase-1 over expression induced by the heme oxygenase-1 inducer hemin protected testes from torsion-detorsion injury. In this study we elucidated which of these enzymes is involved in hemin induced heme oxygenase-1 over expression in testicular tissues after torsion-detorsion injury.

MATERIALS AND METHODS:

Adult male Sprague-Dawley rats (National Science Council, Taipei, Taiwan, Republic of China) were allocated to undergo testicular torsion-detorsion immediately followed by injection of normal saline, hemin or hemin plus tin protoporphyrin, a heme oxygenase-1 inhibitor. Another set of rats that underwent sham operation were used as controls. Testes were harvested 0 and 30 minutes after detorsion and enzyme expression was analyzed.

RESULTS:

Hemin alone caused no significant effects on the expression of Nrf2, nuclear factor-kappaB, extracellular regulated kinase and c-jun N-terminal kinase. Similarly testicular torsion-detorsion injury caused no significant effects on Nrf2 expression. In the presence of torsion-detorsion injury hemin significantly up-regulated Nrf2 expression. Moreover, this effect was not affected by tin protoporphyrin. Unlike Nrf2, the expression of nuclear factor-kappaB, extracellular regulated kinase and c-jun N-terminal kinase was significantly up-regulated by testicular torsion-detorsion. Hemin significantly attenuated the testicular torsion-detorsion induced up-regulation of nuclear factor-kappaB and extracellular regulated kinase but not c-jun N-terminal kinase. The effects of hemin on nuclear factor-kappaB and extracellular regulated kinase were significantly reversed by tin protoporphyrin. However, the expression of p38 mitogen-activated protein kinase in rodent testes was not affected by these interventions.

CONCLUSIONS:

Hemin induced heme oxygenase-1 over expression in rodent testes after torsion-detorsion injury involves Nrf2, nuclear factor-kappaB and extracellular regulated kinase.

• Authors: Stone Yang, Hung-Jen Shih, Yung-Chiong Chow, Pei-Shan Tsai, Chun-Jen Huang
• Journal: The Journal of urology (J Urol) Vol. 179 Issue 6 Pg. 2456-63 (Jun 2008) ISSN: 1527-3792 [Electronic] United States
• PMID: 18433787 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)

Chemical References

• NF-E2-Related Factor 2
• NF-kappa B
• Hemin
• Heme Oxygenase (Decyclizing)
• Hmox1 protein, rat
• Extracellular Signal-Regulated MAP Kinases

Topics

• Animals
• Disease Models, Animal
• Extracellular Signal-Regulated MAP Kinases (physiology)
• Heme Oxygenase (Decyclizing) (biosynthesis)
• Hemin (physiology)
• Male
• NF-E2-Related Factor 2 (physiology)
• NF-kappa B (physiology)
• Rats
• Rats, Sprague-Dawley
• Spermatic Cord Torsion (enzymology, metabolism)