NFI-C2 negatively regulates α-sarcoglycan promoter activity in C2C12 myoblasts

Paul Delgado-Olguín, Haydeé Rosas-Vargas, Félix Recillas-Targa, Alejandro Zentella-Dehesa, Mario Bermúdez De León, Bulmaro Cisneros, Fabio Salamanca, Ramón Coral-Vázquez

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


α-Sarcoglycan striated muscle-specific protein is a member of the sarcoglycan-sarcospan complex. Positive and negative transcriptional regulation of sarcoglycan genes are important in sarcoglycan's intracellular localization and sarcolemmal stability. In the present work we assessed the function of NFI transcription factors in the regulation of α-sarcoglycan promoter through the C2C12 cell line differentiation. NFI factors act alternatively as activators and negative modulators of α-sarcoglycan promoter activity. In myoblasts NFI-A1.1 and NFI-B2 are activators, whereas NFI-C2 and NFI-X2 are negative regulators. In myotubes, all NFI members are activators, being NFI-C2 the less potent. We identified the α-sarcoglycan promoter NFI-C2 response element by testing progressive deletion constructs and point mutations in C2C12 cells over-expressing NFI-C2. Gel-shift and chromatin immunoprecipitation experiments demonstrated that NFI factors are indeed interacting in vitro and in vivo with the binding sequence. These results suggest a NFI role in C2C12 cell differentiation. © 2004 Elsevier Inc. All rights reserved.
Original languageEnglish
Pages (from-to)1032-1039
Number of pages8
JournalBiochemical and Biophysical Research Communications
Publication statusPublished - 2 Jul 2004
Externally publishedYes

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