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Brain Res Mol Brain Res. 1998 Dec 10;63(1):180-3.

Reduced nociceptive behavior in islet amyloid polypeptide (amylin) knockout mice.

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Department of Medical Biochemistry, Göteborg University, Box 440 SE 405 30, Göteborg, Sweden.


Islet amyloid polypeptide (IAPP or amylin) is predominantly expressed by insulin cells, but occurs also in primary sensory neurons in the rat. Here, using mice targeted for a null mutation in the IAPP gene, we establish murine expression of IAPP in sensory neurons; its distribution in a population of calcitonin gene-related peptide-containing neurons in the spinal cord and dorsal root ganglion is similar to that previously described in the rat. We also report the IAPP mutant mice display a reduced pain response in the paw formalin test. Adjuvant-induced joint inflammation was not altered in IAPP mutants, arguing against a peripheral inflammatory abnormality. These findings lead us to suggest that IAPP has a pro-nociceptive function in primary sensory neurons.

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