[Study of antibodies to motor end-plate in ocular myasthenia gravis].
This study was undertaken to investigate whether serum obtained from ocular MG with undetectable antibodies contains antibodies which bind to normal motor end-plates immunohistochemically. Nineteen patients with ocular MG were studied. Anti-AChR antibodies in serum were assayed by an immunoprecipitation method using human junctional AChR as the antigen. Anti-AChR antibodies in serum which bind to the junctional AChR at the motor end-plates were detected immunohistochemically by incubating the muscle with each serum. Bound IgG was detected by peroxidase labeled protein A (P-PA). IgG deposit at the own limb muscle motor end-plates (biceps brachii) was also detected by P-PA. Anti-AChR antibodies in serum were positive in 9 out of 19 patients and IgG antibodies bound to the junctional AChR were demonstrated in 16 of 19 patients. IgG bound to own end-plates was observed in 13 of 14 patients studied. In 2 patients IgG was detected at the own end-plates, but not at the not-self end-plates. These findings indicate that detection of IgG at the limb muscle end-plates serves for the diagnosis of ocular MG with undetectable antibodies in serum and anti-AChR antibodies in some patients may react exclusively with the autologous AChR.
First Department of Internal Medicine, Nagasaki University.
I
I
Kinoshita
M
M
Tsujihata
M
M
Motomura
T
T
Yoshimura
S
S
Nagataki
D000293:Adolescent; D000328:Adult; D000368:Aged; D001323:Autoantibodies / Q000032:analysis*; D002648:Child; D005260:Female; D006801:Humans; D007074:Immunoglobulin G / Q000032:analysis*; D008297:Male; D008875:Middle Aged; D009045:Motor Endplate / Q000276:immunology*; D009157:Myasthenia Gravis / Q000276:immunology*; D009801:Oculomotor Muscles; D011950:Receptors, Cholinergic / Q000276:immunology
D001323:Autoantibodies; D007074:Immunoglobulin G; D011950:Receptors, Cholinergic