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Retinoic acid induces expression of Ig germ line α transcript, an IgA isotype switching indicative, through retinoic acid receptor

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Abstract

Retinoic acid (RA) is considered to possess an activity of IgA isotype switching. Thus far, TGF-β1 is known to be the most powerful IgA isotype switch factor. To elucidate the molecular mechanisms underlying the Ig germ line (GL) α transcriptional regulation by RA, we constructed three different sizes of mouse GLα promoter reporters; short-GLα(−130/+14), middle-GLα(−448/+72) and long-GLα(−3028/+72). Based on luciferase assay, RA increased the activity of all three GLα promoter reporters by approximately 2-fold and the effect was further enhanced by TGF-β1. Overexpression of Smad3/4 increased TGF-β1-induced GLα promoter activities but had no effect on RA-induced GLα promoter activities. In order to analyze the characteristics of the RA-inducible GLα promoter region, we also constructed two mutant reporters: Smad3 binding elements (SBEs)-substituted short-GLα (short-GLα mSBE) and Runx3 binding elements (RBEs)-substituted short-GLα (short-GLα mRBE) promoter reporters. Promoter activities of the two mutant reporters to RA were comparable to that of wild type reporter, while those of the two mutant reporters to TGF-β1 were markedly diminished as compared to that of WT short-GLα. Finally, RA-induced GLα transcription was virtually disappeared by LE540, an antagonist of RA receptor (RAR). Taken together, these results suggest that RA induces GLα transcription mainly through RAR pathway, where neither Smad3/4 nor Runx3 is involved.

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Authors and Affiliations

  1. Department of Molecular Bioscience, College of Biomedical Science, Kangwon National University, Chuncheon, 200-701, Korea

    Mi-Hee Park, Mi-Ra Lee & Pyeung-Hyeun Kim

  2. Medical & Bio-material Research Center, Kangwon National University, Chuncheon, 200-701, Korea

    Pyeung-Hyeun Kim

  3. Department of Microbiology, College of Medicine, Konyang University, Yuseong-gu, Daejeon, 302-801, Korea

    Seok-Rae Park

  4. Korea Advanced Institute of Science and Technology, Yuseong-gu, Daejeon, 302-801, Republic of Korea

    Young-Ha Kim

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  1. Mi-Hee Park
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  2. Seok-Rae Park
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Correspondence to Pyeung-Hyeun Kim.

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Park, MH., Park, SR., Lee, MR. et al. Retinoic acid induces expression of Ig germ line α transcript, an IgA isotype switching indicative, through retinoic acid receptor. Genes Genom 33, 83–88 (2011). https://doi.org/10.1007/s13258-010-0168-5

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