The Effects of Female Sex Steroids on Gastric Secretory Responses of Rat Following Traumatic Brain Injury

Document Type : Original Article

Authors

1 Neuroscience Research Center, Kerman University of Medical Sciences, Kerman, Iran

2 Physiology Research Center, Kerman University of Medical Sciences, Kerman, Iran

3 Kerman University of Medical Sciences, Kerman, Iran

4 Neuroscience and Physiology Research Centers, Kerman University of Medical Sciences, Kerman, Iran

Abstract

Objective(s)
Gastric ulceration is induced by various forms of stress like surgery, ischemia and trauma. The female sex has more resistance to stress and the gastrointestinal lesions happen fewer than male sex. The purpose of this study was to evaluate the role of estradiol and progesterone on the gastric acid and pepsin levels following traumatic brain injury (TBI) induction.
Materials and Methods
Diffuse TBI was induced by Marmarou method in female rats. Rats randomly assigned into 9 groups: intact, OVX (ovarectomized rat), Sham+OVX, TBI (intact rats under TBI), TBI+OVX (ovarectomized rats under TBI) and  treated  OVX  rats  with  vehicle  (sesame  oil),  E2  (estradiol),  P4  (progesterone)  or  E2+P4 combination. The acid content and pepsin levels of each gastric washout sample were measured 5 days after the TBI induction.
Results
There was no significant difference in gastric acid output between groups either after TBI induction or after treatment with E2 or P4 or E2+P4. Gastric pepsin levels were increased in Sham+OVX, TBI (P< 0.001) and TBI+OVX (P< 0.05) compared to intact group. Gastric pepsin levels were significantly lower in E2 and E2+ P4 treated rats than vehicle treated group (P< 0.01). P4 treatment increased gastric pepsin level compared to TBI+OVX group (P< 0.05) and this increment was higher than rats that were treated with the E2 and E2+P4 (P< 0.01).
Conclusion
These results suggest that protective effect of estradiol and E2+P4 combination against mucosal damage after TBI, might be mediated by inhibition of pepsin secretion.

Keywords

References

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