Expression of the antioxidant enzyme peroxiredoxin 5 in the human peripheral nervous system.
Peroxiredoxins (PRDXs) belong to a family of peroxidases that are highly expressed in mammalian tissues. Comparatively, little is known about their expression in the nervous system. In this study, we examined in human sural nerve, the expression of PRDX5, the most recently defined peroxiredoxin family member. Immunohistochemical staining of paraffin sections showed that PRDX5 expression was mainly localised to the axon and, to a lesser extent, to the Schwann cells. Immunogold labelling electron microscopy further revealed that PRDX5 is widely distributed in multiple cellular compartments, most importantly in mitochondria but also in axoplasm, Schwann cell cytosol, nucleus, and myelin. A progressive decline in PRDX5 expression with advancing age was identified in human nerves at different ages. The wide distribution of PRDX5 in cellular and sub-cellular structures indicates that it may play important roles in a wide range of tissue components in normal peripheral nerves.
Lu
Jun Lan
JL
Institute for Neuromuscular Research, The Children's Hospital at Westmead, Sydney, Australia. junlanlu@gmail.com
Vallat
Jean-Michel
JM
Pollard
John D
JD
Knoops
Bernard
B
Ouvrier
Robert
R
D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D000369:Aged, 80 and over; D001369:Axons / Q000378:metabolism; D015153:Blotting, Western; D002648:Child; D002675:Child, Preschool; D003593:Cytoplasm / Q000378:metabolism; D015870:Gene Expression; D006801:Humans; D007150:Immunohistochemistry; D007223:Infant; D007231:Infant, Newborn; D008854:Microscopy, Electron; D008875:Middle Aged; D008928:Mitochondria / Q000378:metabolism; D010544:Peroxidases / Q000096:biosynthesis*; D054464:Peroxiredoxins; D012583:Schwann Cells / Q000378:metabolism; D013497:Sural Nerve / Q000378:metabolism*
D010544:Peroxidases; C515974:PRDX5 protein, human; D054464:Peroxiredoxins