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Diabetes-induced rat tracheal segment supersensitivity to carbachol
J J Mongold1, G H Cros, A Michel
1Laboratoire de pharmacodynamie, Faculté de pharmacie, Montpellier, France.
Canadian Journal of Physiology and Pharmacology
|May 1, 1988
Summary
Diabetes increases airway smooth muscle sensitivity to carbachol in rats. This heightened response, observed in diabetic rats, suggests a potential link between diabetes and autonomic neuropathy affecting the airways.
Area of Science:
- Pharmacology
- Physiology
- Endocrinology
Background:
- Diabetes mellitus can affect various organ systems, including the autonomic nervous system.
- Autonomic dysfunction may influence the contractility of airway smooth muscles.
Purpose of the Study:
- To investigate the impact of diabetes on the contractile responses of rat tracheal smooth muscle to carbachol.
- To determine if insulin treatment mitigates diabetes-induced changes in airway contractility.
Main Methods:
- Tracheal segments were isolated from control rats, streptozotocin-induced diabetic rats, and insulin-treated diabetic rats.
- Contractile responses to varying concentrations of carbachol were measured.
- Carbachol pD2 values were calculated to assess receptor sensitivity.
Main Results:
- Diabetic rat tracheal segments showed significantly enhanced responsiveness to low carbachol concentrations compared to controls.
- Carbachol pD2 values were significantly higher in diabetic rats, indicating supersensitivity.
- Insulin treatment did not fully reverse the observed supersensitivity.
Conclusions:
- Diabetes induces supersensitivity to carbachol in rat airway smooth muscle.
- This supersensitivity may be associated with diabetes-induced vagal autonomic neuropathy.
- Further research is needed to elucidate the precise mechanisms involved.