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NuMA protein is a human autoantigen.

C M Price, G A McCarty, D E Pettijohn

Arthritis and Rheumatism

|July 1, 1984

Summary

Researchers identified autoantibodies targeting the nuclear mitotic apparatus (NuMA) protein in patients with connective tissue disease. These autoantibodies specifically bind to NuMA, confirming it as a human autoantigen involved in cell division.

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Area of Science:

Immunology
Cell Biology
Autoimmunity

Background:

Patients with connective tissue disease often exhibit autoantibodies against nuclear antigens.
The nuclear mitotic apparatus (NuMA) protein, a recently identified nuclear antigen, has a distinct localization in both interphase and mitotic cells.

Purpose of the Study:

To investigate the identity of an unusual nuclear antigen recognized by autoantibodies in patients with suspected or confirmed connective tissue disease.
To determine if the autoantibodies observed are specific for the nuclear mitotic apparatus (NuMA) protein.

Main Methods:

Immunofluorescence studies to characterize the distribution of the autoantigen in interphase and mitotic cells.
Immunoblot analysis to confirm the specificity of the autoantibodies against the nuclear mitotic apparatus (NuMA) protein.

Main Results:

Autoantibodies were found to target a nuclear antigen present in the nuclei of interphase cells and spindle poles of mitotic cells.
The observed distribution pattern matched that of the nuclear mitotic apparatus (NuMA) protein.
Immunoblot analysis confirmed that the autoantibodies specifically bind to the nuclear mitotic apparatus (NuMA) protein.

Conclusions:

The nuclear mitotic apparatus (NuMA) protein is a human autoantigen.
These findings identify NuMA as a target in autoimmune responses associated with connective tissue diseases.

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