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Liu, Yao; Atkinson, Rachel A.K; Fernandez-Martos, Carmen M; Kirkcaldie, Matthew T.K; Cui, Hao; Vickers, James C; King, Anna E
Neurobiology of aging, 02/2015, Letnik: 36, Številka: 2Journal Article
Abstract The transactive response DNA-binding protein 43 (TDP-43) has been identified as a neurofilament light ( NF-L ) messenger RNA (mRNA)-binding protein. Abnormally increased levels of TDP-43 are detected in patients with amyotrophic lateral sclerosis and a downregulation of NF-L mRNA. However, links between NF-L and TDP-43 expressions are unclear. In this study, we investigated whether the deficiency of NF-L protein can result in alterations in TDP-43 localization or protein expression and whether this is altered with aging. There was a significant increase in TDP-43 protein levels in the cortex and lumbar spinal cord in 12-month-old NF-L knockout (NF-L KO) mice, compared with wild-type (WT) C57BL/6 mice. However, there was no difference in either the phosphorylation of TDP-43 between WT and NF-L KO mice or the abnormal mislocalization of TDP-43 to the cytoplasm in NF-L KO animals. Our findings suggest that NF-L protein or mRNA may negatively affect the expression of TDP-43 in the central nervous system. However, altered phosphorylation of TDP-43 may be more highly associated with aging than the levels of TDP-43 expression.
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