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Subcellular localization and mechanisms of nucleocytoplasmic distribution of p202, an interferon‐inducible candidate for lupus susceptibility
Author(s) -
Choubey Divaker,
Pramanik Rocky,
Xin Hong
Publication year - 2003
Publication title -
febs letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.593
H-Index - 257
eISSN - 1873-3468
pISSN - 0014-5793
DOI - 10.1016/s0014-5793(03)01006-8
Subject(s) - cytoplasm , microbiology and biotechnology , systemic lupus erythematosus , chemistry , interferon , nucleus , organelle , subcellular localization , biology , immunology , pathology , medicine , disease
Increased expression of p202 (52 kDa), an interferon (IFN)‐inducible murine protein, in splenic cells (B‐ and T‐cells) derived from female mice of the lupus‐prone strains is correlated with increased susceptibility to develop systemic lupus erythematosus. However, the molecular mechanisms remain unclear. Our previous studies have indicated that, in IFN‐treated fibroblasts, p202 is detected both in the cytoplasm and in the nucleus. Moreover, in the cytoplasm, a fraction of p202 associates with a membranous organelle. Here we report that, in the cytoplasm, a fraction of p202 associated with mitochondria. Additionally, we found that the constitutive p202 is primarily detected in the cytoplasm. Remarkably, the IFN treatment of cells potentiated nuclear accumulation of p202. Our observations are consistent with the possibility that IFN signaling regulates p202 levels as well as its nucleocytoplasmic distribution. These observations will serve as a basis to elucidate the molecular mechanisms by which p202 contributes to lupus susceptibility.