Genetic variability in the rat Aplec C-type lectin gene cluster regulates lymphocyte trafficking and motor neuron surviv
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RESEARCH
JOURNAL OF NEUROINFLAMMATION
Open Access
Genetic variability in the rat Aplec C-type lectin gene cluster regulates lymphocyte trafficking and motor neuron survival after traumatic nerve root injury Rickard PF Lindblom1,2*, Shahin Aeinehband1, Roham Parsa1, Mikael Ström1, Faiez Al Nimer1, Xing-Mei Zhang1, Cecilia A Dominguez1, Sevasti Flytzani1, Margarita Diez1 and Fredrik Piehl1
Abstract Background: C-type lectin (CLEC) receptors are important for initiating and shaping immune responses; however, their role in inflammatory reactions in the central nervous system after traumatic injuries is not known. The antigenpresenting lectin-like receptor gene complex (Aplec) contains a few CLEC genes, which differ genetically among inbred rat strains. It was originally thought to be a region that regulates susceptibility to autoimmune arthritis, autoimmune neuroinflammation and infection. Methods: The inbred rat strains DA and PVG differ substantially in degree of spinal cord motor neuron death following ventral root avulsion (VRA), which is a reproducible model of localized nerve root injury. A large F2 (DAxPVG) intercross was bred and genotyped after which global expressional profiling was performed on spinal cords from F2 rats subjected to VRA. A congenic strain, Aplec, created by transferring a small PVG segment containing only seven genes, all C-type lectins, ontoDA background, was used for further experiments together with the parental strains. Results: Global expressional profiling of F2 (DAxPVG) spinal cords after VRA and genome-wide eQTL mapping identified a strong cis-regulated difference in the expression of Clec4a3 (Dcir3), a C-type lectin gene that is a part of the Aplec cluster. Second, we demonstrate significantly improved motor neuron survival and also increased T-cell infiltration into the spinal cord of congenic rats carrying Aplec from PVG on DA background compared to the parental DA strain. In vitro studies demonstrate that the Aplec genes are expressed on microglia and upregulated upon inflammatory stimuli. However, there were no differences in expression of general microglial activation markers between Aplec and parental DA rats, suggesting that the Aplec genes are involved in the signaling events rather than the primary activation of microglia occurring upon nerve root injury. Conclusions: In summary, we demonstrate that a genetic variation in Aplec occurring among inbred strains regulates both survival of axotomized motor neurons and the degree of lymphocyte infiltration. These results demonstrate a hitherto unknown role for CLECs for intercellular communication that occurs after damage to the nervous system, which is relevant for neuronal survival. Keywords: Neuroinflammation, Neurodegeneration, Microglia, Aplec
* Correspondence: [email protected] 1 Department of Clinical Neuroscience, Unit for Neuroimmunology, Karolinska Institutet, Stockholm, Sweden 2 Neuroimmunology Unit, CMM L8:04, Karolinska University Hospital, 171 76, Stockholm, Sweden © 2013 Lindblom et al.; licensee BioMed C
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