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. 1997 Oct;191(Pt 3):431–440. doi: 10.1046/j.1469-7580.1997.19130431.x

Colocalisation of insulin and IGF-1 receptors in cultured rat sensory and sympathetic ganglion cells

S N KARAGIANNIS 1, R H M KING 1, P K THOMAS 1
PMCID: PMC1467700  PMID: 9419000

Abstract

Peripheral sensory and autonomic neurons are known to possess insulin receptors. These have been considered to be of the peripheral type, i.e. similar to those of hepatic and fat cells rather than of the brain type which show dual specificity for both insulin and insulin-like growth factor (IGF-1). We have examined the localisation of insulin and IGF-1 receptors in cultured sensory and sympathetic ganglion cells using confocal microscopy and indirect labelling with FITC (fluorescein isothiocyanate) and TRITC (tetramethyl rhodamine isothiocyanate) respectively. We have shown that in cultured U266B1 multiple myeloma cells these receptors display separate localisation, whereas they are colocalised in IM-9 lymphocytes which are known to possess hybrid receptors. We have confirmed the sequestration of insulin and IGF-1 receptors in the cytoplasm of sensory and sympathetic neurons, consistent with a brain-type receptor. The colocalisation of insulin and IGF-1 receptors in sensory and sympathetic ganglion cells is consistent with the view that they are hybrid receptors, similar to those present in the CNS. The function of these receptors, as suggested for the CNS, may be related to trophic support for neurons.

Keywords: Neurotrophic support, diabetic neuropathy, hybrid receptors

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Selected References

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