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Mesenteric mast cell degranulation is not essential for conditioned taste aversion
Pharmacology, Biochemistry, and Behavior
|December 1, 1978
Summary
This study investigated if mast cell degranulation causes conditioned taste aversion (CTA). Results indicate that while Compound 48/80 induced CTA and mast cell degranulation, LiCl did not alter mast cells, suggesting mast cells are not essential for LiCl-induced CTA.
Area of Science:
- Neuroscience
- Physiology
- Immunology
Background:
- Conditioned taste aversion (CTA) is a learned aversion to a flavor after illness.
- The role of specific physiological mediators, like mast cells, in initiating CTA is not fully understood.
Purpose of the Study:
- To investigate the potential role of mesenteric mast cell degranulation in mediating the unconditioned stimulus (UCS) effects that lead to CTA.
- To compare the effects of a mast cell degranulator (Compound 48/80) with LiCl on CTA induction and mast cell morphology.
Main Methods:
- Rats were conditioned to avoid 10% sucrose using either LiCl or Compound 48/80 as the UCS.
- Mesenteric mast cell degranulation was assessed histologically.
- The effect of the antihistamine chlorpheniramine on CTA induction was evaluated.
Main Results:
- Both LiCl and Compound 48/80 induced CTA to sucrose.
- Compound 48/80 caused significant mesenteric mast cell degranulation, whereas LiCl and saline controls did not.
- Chlorpheniramine pretreatment did not block CTA induced by either LiCl or Compound 48/80 and appeared to facilitate aversion.
Conclusions:
- Mesenteric mast cell degranulation is not a necessary mediator for LiCl-induced CTA.
- The findings suggest that mast cells may play a role in certain types of CTA, but not all.
- Antihistamine administration did not prevent CTA and may enhance aversion, warranting further investigation into its mechanisms.