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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Viatchenko-karpinski, Viacheslav Y. Borisyuk, Anya L. Khomula, Eugen V. Duzhyy, Dmytro E. Belan, Pavel V. Voitenko, Nana V. |
| Description | Author Affiliation: Khomula EV ( International Center of Molecular Physiology of Natl. Acad. of Sci. of Ukraine, Kyiv, Ukraine. eugen_kh@biph.kiev.ua) |
| Abstract | Streptozotocin (STZ)-induced type 1 diabetes in rats leads to the development of peripheral diabetic neuropathy (PDN) manifested as thermal hyperalgesia at early stages (4th week) followed by hypoalgesia after 8 weeks of diabetes development. Here we found that 6–7 week STZ-diabetic rats developed either thermal hyper- (18%), hypo- (25%) or normalgesic (57%) types of PDN. These developmentally similar diabetic rats were studied in order to analyze mechanisms potentially underlying different thermal nociception. The proportion of IB4-positive capsaicin-sensitive small DRG neurons, strongly involved in thermal nociception, was not altered under different types of PDN implying differential changes at cellular and molecular level. We further focused on properties of T-type calcium and TRPV1 channels, which are known to be involved in Ca $^{2$ + signaling and pathological nociception. Indeed, TRPV1-mediated signaling in these neurons was downregulated under hypo- and normalgesia and upregulated under hyperalgesia. A complex interplay between diabetes-induced changes in functional expression of Cav3.2 T-type calcium channels and depolarizing shift of their steady-state inactivation resulted in upregulation of these channels under hyper- and normalgesia and their downregulation under hypoalgesia. As a result, T-type window current was increased by several times under hyperalgesia partially underlying the increased resting [Ca $^{2$ + ] $_{i}$ observed in the hyperalgesic rats. At the same time Cav3.2-dependent Ca $^{2$ + signaling was upregulated in all types of PDN. These findings indicate that alterations in functioning of Cav3.2 T-type and TRPV1 channels, specific for each type of PDN, may underlie the variety of pain syndromes induced by type 1 diabetes. |
| ISSN | 00063002 |
| Journal | Biochimica et Biophysica Acta (BBA) - Reviews on Cancer |
| Issue Number | 5 |
| Volume Number | 1832 |
| Language | English |
| Publisher | Elsevier |
| Publisher Date | 2013-05-01 |
| Publisher Place | Netherlands |
| Access Restriction | Open |
| Subject Keyword | Calcium Channels, T-Type Physiology Diabetes Mellitus, Experimental Physiopathology Diabetic Neuropathies TRPV Cation Channels Animals Calcium Metabolism Capsaicin Pharmacology Cells, Cultured Complications Diabetes Mellitus, Type 1 Etiology Ganglia, Spinal Cytology Hyperalgesia Membrane Potentials Neurons Drug Effects Patch-Clamp Techniques Rats, Wistar Sensory System Agents Research Support, Non-U.S. Gov't Biochemistry |
| Content Type | Text |
| Resource Type | Article |
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