Deletion of the insulin receptor in sensory neurons increases pancreatic insulin levels
| Autor: | Janelle M. Ryals, Lesya Novikova, Brianne L. Guilford, Natalie M. Wilson, Douglas E. Wright, Lisa Stehno-Bittel, Natalie K. Katz, Caleb W. Grote |
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| Rok vydání: | 2017 |
| Předmět: |
0301 basic medicine
Blood Glucose Male medicine.medical_specialty Sensory Receptor Cells medicine.medical_treatment Sensory system Mice Transgenic Article 03 medical and health sciences Mice 0302 clinical medicine Developmental Neuroscience Internal medicine medicine Animals Insulin Pancreas Mice Knockout biology business.industry Pancreatic islets Microfilament Proteins Sensory neuron Receptor Insulin Insulin receptor 030104 developmental biology medicine.anatomical_structure Endocrinology Neurology biology.protein Female Beta cell business 030217 neurology & neurosurgery Gene Deletion Neurotrophin |
| Zdroj: | Experimental neurology. 305 |
| ISSN: | 1090-2430 |
| Popis: | Insulin is known to have neurotrophic properties and loss of insulin support to sensory neurons may contribute to peripheral diabetic neuropathy (PDN). Here, genetically-modified mice were generated in which peripheral sensory neurons lacked the insulin receptor (SNIRKO mice) to determine whether disrupted sensory neuron insulin signaling plays a crucial role in the development of PDN and whether SNIRKO mice develop symptoms of PDN due to reduced insulin neurotrophic support. Our results revealed that SNIRKO mice were euglycemic and never displayed significant changes in a wide range of sensorimotor behaviors, nerve conduction velocity or intraepidermal nerve fiber density. However, SNIRKO mice displayed elevated serum insulin levels, glucose intolerance, and increased insulin content in the islets of Langerhans of the pancreas. These results contribute to the growing idea that sensory innervation of pancreatic islets is key to regulating islet function and that a negative feedback loop of sensory neuron insulin signaling keeps this regulation in balance. Our results suggest that a loss of insulin receptors in sensory neurons does not lead to peripheral nerve dysfunction. The SNIRKO mice will be a powerful tool to investigate sensory neuron insulin signaling and may give a unique insight into the role that sensory neurons play in modifying islet physiology. |
| Databáze: | OpenAIRE |
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