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A genetic variant of p53 restricts the mucous secretory phenotype by regulating SPDEF and Bcl-2 expression

Author

Listed:
  • Hitendra S. Chand

    (COPD Program, Lovelace Respiratory Research Institute)

  • Gilbert Montano

    (COPD Program, Lovelace Respiratory Research Institute)

  • Xuesong Huang

    (COPD Program, Lovelace Respiratory Research Institute)

  • Scott H. Randell

    (The University of North Carolina)

  • Yohannes Mebratu

    (COPD Program, Lovelace Respiratory Research Institute)

  • Hans Petersen

    (COPD Program, Lovelace Respiratory Research Institute)

  • Yohannes Tesfaigzi

    (COPD Program, Lovelace Respiratory Research Institute)

Abstract

Despite implications for carcinogenesis and other chronic diseases, basic mechanisms of p53 and its variants in suppressing Bcl-2 levels are poorly understood. Bcl-2 sustains mucous cell metaplasia, whereas p53−/− mice display chronically increased mucous cells. Here we show that p53 decreases bcl-2 mRNA half-life by interacting with the 5′ untranslated region (UTR). The p53–bcl-2 mRNA interaction is modified by the substitution of proline by arginine within the p53 proline-rich domain (PRD). Accordingly, more mucous cells are present in primary human airway cultures with p53Arg compared with p53Pro. Also, the p53Arg compared with p53Pro displays higher affinity to and activates the promoter region of SAM-pointed domain-containing Ets-like factor (SPDEF), a driver of mucous differentiation. On two genetic backgrounds, mice with targeted replacement of prolines in p53 PRD show enhanced expression of SPDEF and Bcl-2 and mucous cell metaplasia. Together, these studies define the PRD of p53 as a determinant for chronic mucous hypersecretion.

Suggested Citation

  • Hitendra S. Chand & Gilbert Montano & Xuesong Huang & Scott H. Randell & Yohannes Mebratu & Hans Petersen & Yohannes Tesfaigzi, 2014. "A genetic variant of p53 restricts the mucous secretory phenotype by regulating SPDEF and Bcl-2 expression," Nature Communications, Nature, vol. 5(1), pages 1-14, December.
    • Handle: RePEc:nat:natcom:v:5:y:2014:i:1:d:10.1038_ncomms6567
    DOI: 10.1038/ncomms6567
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