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Effects of anti-rVEGF on the expression of VEGF receptor-2 and P2X(2/3) receptors of the spinal dorsal horn in neuropathic pain rats.

08:12 EDT 21st May 2013 | BioPortfolio

Summary of "Effects of anti-rVEGF on the expression of VEGF receptor-2 and P2X(2/3) receptors of the spinal dorsal horn in neuropathic pain rats."

Neuropathic pain is caused by the peripheral or central nervous system structure damage or dysfunction. VEGF is involved in nociception and inflammation. VEGF may target VEGF receptor-2 (VEGFR-2) on the surface of neurons. P2X(2/3) receptors play a crucial role in facilitating pain transmission at the spinal sites. Chronic constriction injury (CCI) rats were used as neuropathic pain model. Sprague-Dawley male rats were randomly divided into sham group, anti-recombinant VEGF antibody group with phosphate-buffer saline (anti-rVEGF+PBS group), CCI rats treated with phosphate-buffer saline group (CCI+PBS group) and CCI rats treated with anti-recombinant VEGF antibody group (CCI+anti-rVEGF group). The expressions of VEGFR-2, P2X(2) and P2X(3) protein in spinal dorsal horn (SDH) were detected by immunohistochemistry, double-label immunofluorescence and western blotting. The protein levels of VEGFR-2, P2X(2) and P2X(3) in L4/5 SDH of CCI+PBS group were higher than those in sham group. VEGFR-2 and P2X(2) or P2X(3) receptors were co-expressed in the cytoplasm and surface membranes of SDH. Anti-rVEGF treatment in CCI rats reduced the expression of VEGFR-2 and P2X(2/3) receptors in L4/5 SDH compared with those in CCI+PBS group. Therefore, VEGF may activate VEGFR-2 to participate the process of neuropathic pain. Anti-rVEGF treatment in CCI rats reduced the expression of VEGFR-2 and inhibited the transmission of neuropathic pain in L4/5 SDH via decreasing the expression of P2X(2/3). There is a cross-potentiation between VEGFR-2 and P2X(2/3) receptors in neuropathic pain state.

Affiliation

Department of Physiology, Medical College of Nanchang University, Nanchang, Jiangxi 330006, PR China.

Journal Details

This article was published in the following journal.

Name: Brain research bulletin
ISSN: 1873-2747
Pages: 227-33

Links

Medical and Biotech [MESH] Definitions

Vascular Endothelial Growth Factor Receptor-1

A 180-kDa VEGF receptor found primarily in endothelial cells that is essential for vasculogenesis and vascular maintenance. It is also known as Flt-1 (fms-like tyrosine kinase receptor-1). A soluble, alternatively spliced isoform of the receptor may serve as a binding protein that regulates the availability of various ligands for VEGF receptor binding and signal transduction.

Neuropilins

Neuropilins are 140-kDa vertebrate cell surface receptors that bind neuronal guidance molecules during neural development and axonal outgrowth, and modulate VEGF-mediated angiogenesis. NEUROPILIN-1 and NEUROPILIN-2 differ in their binding specificities, and are distributed complementarily in regions of the developing nervous system. Neuropilins are receptors for secreted CLASS 3 SEMAPHORINS as well as for vascular endothelial growth factors, and may form hetero- or homodimers. They may also interact synergistically with plexins and with VEGF RECEPTORS to form receptor complexes with distinct affinities and specificities. Neuropilin binding specificity is determined by CUB and coagulation-factor-like domains in the extracellular portion of the molecule, while a MAM domain is essential for SIGNAL TRANSDUCTION.

Baclofen

A GAMMA-AMINOBUTYRIC ACID derivative that is a specific agonist at GABA-B receptors (RECEPTORS, GABA-B). It is used in the treatment of spasticity, especially that due to spinal cord damage. Its therapeutic effects result from actions at spinal and supraspinal sites, generally the reduction of excitatory transmission.

Neuropilin-2

Transmembrane receptor for CLASS 3 SEMAPHORINS and several vascular endothelial growth factor isoforms. Neuropilin-2 functions either as a homodimer or as a heterodimer with NEUROPILIN-1. The binding affinity of neuropilin-2 varies for different class 3 semaphorin isoforms and is dependent on the composition of the dimer. The protein also forms receptor complexes with plexins and with VEGF RECEPTORS, which alters the binding characteristics of the receptor.

Receptors, Interferon

Specific molecular sites or structures on or in cells with which interferons react or to which they bind in order to modify the function of the cells. Interferons exert their pleiotropic effects through two different receptors. alpha- and beta-interferon crossreact with common receptors, while gamma-interferon initiates its biological effects through its own specific receptor system.

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