Inhibition of glyceraldehyde-3-phosphate dehydrogenase activity by antibodies present in the cerebrospinal fluid of patients with multiple sclerosis.
We have previously shown that B cells and Abs reactive with GAPDH and antitriosephosphate isomerase (TPI) are present in lesions and cerebrospinal fluid (CSF) in multiple sclerosis (MS). In the current study, we studied the effect of anti-GAPDH and anti-TPI CSF IgG on the glycolytic enzyme activity of GAPDH and TPI after exposure to intrathecal IgG from 10 patients with MS and 34 patients with other neurologic diseases. The degree of inhibition of GAPDH activity by CSF anti-GAPDH IgG in the seven MS samples tested varied from 13 to 98%, which seemed to correlate with the percentage of anti-GAPDH IgG in the CSF IgG (1-45%). Inhibition of GAPDH activity (18 and 23%) by CSF IgG was seen in two of the 34 patients with other neurologic diseases, corresponding to the low percentage of CSF anti-GAPDH IgG (1 and 8%). In addition, depletion of anti-GAPDH IgG from CSF IgG, using immobilized GAPDH, removed the inhibitory effect of the IgG on GAPDH. No inhibition of GAPDH activity was seen with CSF samples not containing anti-GAPDH IgG. No inhibition of TPI activity was seen with any purified CSF IgG sample. These findings demonstrate an increased percentage of anti-GAPDH Abs in the CSF of patients with MS that can inhibit GAPDH glycolytic enzyme activity and may contribute to neuroaxonal degeneration.
Kölln
Johanna
J
Department of Neurology, University of California at Irvine, Irvine, CA 92697, USA.
Zhang
Yiping
Y
Thai
Gaby
G
Demetriou
Michael
M
Hermanowicz
Neal
N
Duquette
Pierre
P
van den Noort
Stanley
S
Qin
Yufen
Y
D000328:Adult; D000818:Animals; D001323:Autoantibodies / Q000096:biosynthesis / Q000134:cerebrospinal fluid* / Q000502:physiology; D015536:Down-Regulation / Q000276:immunology; D004789:Enzyme Activation / Q000276:immunology; D005260:Female; D005987:Glyceraldehyde-3-Phosphate Dehydrogenases / Q000037:antagonists & inhibitors* / Q000276:immunology* / Q000378:metabolism; D006801:Humans; D007074:Immunoglobulin G / Q000096:biosynthesis / Q000134:cerebrospinal fluid* / Q000502:physiology; D008297:Male; D008875:Middle Aged; D009103:Multiple Sclerosis / Q000134:cerebrospinal fluid / Q000201:enzymology* / Q000276:immunology*; D019636:Neurodegenerative Diseases / Q000134:cerebrospinal fluid / Q000201:enzymology / Q000276:immunology; D011817:Rabbits; D014305:Triose-Phosphate Isomerase / Q000276:immunology / Q000378:metabolism; D015854:Up-Regulation / Q000276:immunology
D001323:Autoantibodies; D007074:Immunoglobulin G; D005987:Glyceraldehyde-3-Phosphate Dehydrogenases; D014305:Triose-Phosphate Isomerase