Estrogen rapidly modulates mustard oil-induced visceral hypersensitivity in conscious female rats: A role of CREB phosphorylation in spinal dorsal horn neurons.

Abstract

This study investigated the effect of sex hormones on mustard oil (MO)-induced visceral hypersensitivity in female rats and analyzed possible involved signaling pathways. Female rats, either intact or ovariectomized (OVX), were prepared for abdominal muscle electromyography in response to colorectal distension after intracolonic instillation of MO. The effect of MO intracolonic sensitization was evaluated in intact rats, OVX rats, and OVX rats pretreated with a single injection of 17beta-estradiol (E), progesterone (P), E+P, or vehicle. cAMP-responsive element-binding protein (CREB) and phosphorylated CREB (pCREB) were detected in the superficial dorsal horn of L6 and S1 in MO or mineral oil-treated OVX rats with/without colorectal distension and estrogen replacement. The distal colorectum was removed for histological evaluation of inflammatory severity in MO-treated intact or OVX rats. The MO-treated rats had significantly higher visceromotor reflex than controls (enhanced visceral hypersensitivity), whereas OVX eliminated this hypersensitivity. After a single injection of E or E+P, the rats rapidly restored MO-induced visceral hypersensitivity within 2 h. Estrogen also rapidly induced a dose-dependent increase in pCREB expression in the superficial dorsal horn neurons in MO-treated, but not mineral oil-treated, OVX rats. The present study suggests that estrogen can rapidly modulate visceral hypersensitivity induced by MO intracolonic instillation in conscious female rats, which may involve spinal activation of the cAMP response element-mediated gene induction pathway.

• Authors: Ching-Liang Lu, Jen-Chuen Hsieh, Meei-Ling Tsaur, Yn-Ho Huang, Paulus S Wang, Learn-Long Wu, Pei-Yi Liu, Full-Young Chang, Shou-Dong Lee
• Journal: American journal of physiology. Gastrointestinal and liver physiology (Am J Physiol Gastrointest Liver Physiol) Vol. 292 Issue 1 Pg. G438-46 (Jan 2007) ISSN: 0193-1857 [Print] United States
• PMID: 16973918 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)

Chemical References

• Cyclic AMP Response Element-Binding Protein
• Plant Oils
• Progesterone
• Estradiol
• mustard oil

Topics

• Animals
• Colon (physiology)
• Cyclic AMP Response Element-Binding Protein (drug effects, metabolism)
• Estradiol (pharmacology)
• Female
• Muscle, Smooth (drug effects, physiology)
• Mustard Plant
• Ovariectomy
• Phosphorylation
• Plant Oils (pharmacology)
• Posterior Horn Cells (drug effects, physiology)
• Progesterone (pharmacology)
• Rats
• Rats, Sprague-Dawley
• Rectum (physiology)
• Viscera (drug effects, physiology)