Stress and pain responses in rats lacking CCK1 receptors |
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Authors: | Hurwitz I Malkesman O Stern Y Schroeder M Lavi-Avnon Y Shayit M Shavit Y Wolf G Yirmiya R Weller A |
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Institution: | Interdisciplinary Program in the Brain Sciences, Bar Ilan University, Ramat-Gan, Israel. |
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Abstract: | CCK involvement in stress- and pain-responsiveness was examined by studying the behavior of infant (11-12-days-old) and adult OLETF rats that do not express CCK1 receptors. Infant odor- and texture-preferences were also assessed. We hypothesized that OLETF rats will show behavioral patterns similar to those previously observed after CCK1 antagonist administration. Rate of separation-induced ultrasonic vocalization was significantly greater in OLETF compared to controls, in two separate studies. Infant pups of the two strains did not differ in odor- and texture-preference tests. OLETF rats showed consistently longer hot-plate paw-lift (as infants, in two separate studies) and paw-lick (as adults) latencies. SUMMARY: OLETF pups vocalized in isolation more than controls and showed relative hypoalgesic responses, evident also in adulthood, in concordance with the pharmacological literature. |
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