Leptin regulates olfactory-mediated behavior in ob/ob mice
| Autor: | Kevin Kwong, Arnold J. Stromberg, Thomas V. Getchell, Marilyn L. Getchell, Christopher P. Saunders |
|---|---|
| Rok vydání: | 2006 |
| Předmět: |
Leptin
Male Olfactory system medicine.medical_specialty Time Factors Mice Obese Adipokine Receptors Cell Surface Experimental and Cognitive Psychology In situ hybridization Biology Mice Behavioral Neuroscience Internal medicine medicine Animals Receptor In Situ Hybridization Appetitive Behavior Leptin receptor Behavior Animal Dose-Response Relationship Drug digestive oral and skin physiology Olfactory Pathways Immunohistochemistry Smell Dose–response relationship Endocrinology medicine.anatomical_structure Receptors Leptin Olfactory epithelium |
| Zdroj: | Physiology & Behavior. 87:848-856 |
| ISSN: | 0031-9384 |
| DOI: | 10.1016/j.physbeh.2005.11.016 |
| Popis: | We have investigated olfactory-mediated pre-ingestive behavior in leptin (ob/ob) and leptin receptor (db/db) mutant mice compared to age- and gender-matched wild-type (wt) mice. Olfactory-mediated behavior was tested using a buried food paradigm 5 times/day at 2-h intervals for 6 days. Mean food-finding times of ob/ob and db/db mice were approximately 10 times shorter than those of wt mice. To test the effect of leptin replacement in ob/ob mice, leptin (1 or 5 microg/g body weight in sterile saline) or carrier was injected i.p. once daily prior to testing. Mean food finding times in ob/ob mice injected with carrier or with 1 microg/g leptin were similar and were 2-3 times faster than in wt mice. Mean food finding times in ob/ob mice injected with 5 microg/g leptin tripled compared to carrier-injected ob/ob mice and were of the same order of magnitude as those of wt mice, suggesting functional leptin replacement. A 3-factor repeated measures ANOVA demonstrated significant differences between the 6 cohorts (P = 0.0001), food finding times (P< or = 0.0001), and cohort by day interaction (P< or = 0.0001). Post hoc tests suggested that the ob/ob+5 mug/g leptin cohort performed more like the wt cohort in the food-finding test than like the ob/ob or ob/ob+carrier cohort. Potential local sites of leptin production and action were identified with immunohistochemistry and in situ hybridization in epithelial and gland cells of the olfactory and nasal mucosae. Our results strongly suggest that leptin acting through leptin receptors modulates olfactory-mediated pre-ingestive behavior. |
| Databáze: | OpenAIRE |
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