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Mol Cell Biol. 1993 April; 13(4): 2342-2353

Cell-specific helix-loop-helix factor required for pituitary expression of the pro-opiomelanocortin gene.

M Therrien and J Drouin

Institut de Recherches Cliniques de Montréal, Québec, Canada.

ABSTRACT

Pro-opiomelanocortin (POMC)-expressing cells appear to be the first pituitary cells committed to hormone production. In this work, we have identified an element of the POMC promoter which confers cell-specific activity. This element did not exhibit any activity on its own and required at least one other element of the promoter to manifest its cell-specific activity. Fine mutagenesis of this element indicated that a CANNTG motif is responsible for activity. This E-box motif is typical of binding sites for helix-loop-helix (HLH) transcription factors; however, the POMC cell-specific E box cannot be replaced by other E boxes like the kappa E2 site of the immunoglobulin gene or a muscle-specific E box. Similar E boxes which are present in the insulin gene promoter were shown to contribute to the pancreatic specificity of the insulin promoter. However, E-box-binding proteins found in nuclear extracts from POMC-expressing AtT-20 cells and from insulin-expressing cells have different electrophoretic mobilities. The AtT-20 proteins were named CUTE (for corticotroph upstream transcription element-binding) proteins, and they were not found in any other cells. CUTE proteins have DNA-binding properties characteristic of HLH transcription factors. Overexpression of the dominant negative HLH protein Id or of the ubiquitous positive HLH factor rat Pan-2 decreased or augmented POMC promoter activity, respectively. These observations are consistent with the hypothesis that CUTE factors might be heterodimers. This hypothesis was further supported by antibody shift experiments and by abrogation of DNA binding in the presence of bacterially expressed Id protein. Thus, the cell-specific CUTE proteins and their binding site in the POMC promoter appear to be important determinants for cell specificity of this promoter. The requirement for HLH factors in POMC transcription also presents the possibility that these factors are involved in differentiation of pituitary cells, in analogy with the role of HLH factors in muscle development.

Mol Cell Biol. 1993 April; 13(4): 2342-2353




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