TY - JOUR
T1 - The microphthalmia transcription factor (MITF) contains two N-terminal domains required for transactivation of osteoclast target promoters and rescue of mi mutant osteoclasts
AU - Mansky, Kim C.
AU - Marfatia, Kavita
AU - Purdom, Georgia H.
AU - Luchin, Alex
AU - Hume, David A.
AU - Ostrowski, Michael C.
PY - 2002/2/1
Y1 - 2002/2/1
N2 - The microphthalmia transcription factor (MITF) regulates gene expression during differentiation of several distinct cell types, including osteoclasts. A structure/function analysis was performed to determine whether transcription activation domains were important for MITF action in osteoclasts. In addition to a previously characterized acidic activation necessary for melanocyte differentiation, the analysis defined a second potential activation domain located between amino acids 140 and 185. This second domain is required for MITF transactivation of two probable targets, the E-cadherin promoter and the tartrate-resistant acid phosphatase promoter, in transient transfection assays. An intact MITF gene rescued differentiation when introduced into osteoclasts derived from mi/mi mice using a retrovirus vector. In parallel experiments, an MITF gene lacking the acidic-activation domain rescued differentiation twofold less efficiently than wild type, and a gene lacking the region between amino acid residues 140 and 185 rescued differentiation tenfold less efficiently than wild type. The results indicate that the N-terminal region of MITF is necessary for activation of gene expression in osteoclasts and provides one mechanism by which this factor regulates distinct target genes in different cell types.
AB - The microphthalmia transcription factor (MITF) regulates gene expression during differentiation of several distinct cell types, including osteoclasts. A structure/function analysis was performed to determine whether transcription activation domains were important for MITF action in osteoclasts. In addition to a previously characterized acidic activation necessary for melanocyte differentiation, the analysis defined a second potential activation domain located between amino acids 140 and 185. This second domain is required for MITF transactivation of two probable targets, the E-cadherin promoter and the tartrate-resistant acid phosphatase promoter, in transient transfection assays. An intact MITF gene rescued differentiation when introduced into osteoclasts derived from mi/mi mice using a retrovirus vector. In parallel experiments, an MITF gene lacking the acidic-activation domain rescued differentiation twofold less efficiently than wild type, and a gene lacking the region between amino acid residues 140 and 185 rescued differentiation tenfold less efficiently than wild type. The results indicate that the N-terminal region of MITF is necessary for activation of gene expression in osteoclasts and provides one mechanism by which this factor regulates distinct target genes in different cell types.
KW - E-cadherin
KW - Myeloid differentiation
KW - Transcriptional regulation
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M3 - Article
C2 - 11818451
AN - SCOPUS:0036486771
SN - 0741-5400
VL - 71
SP - 295
EP - 303
JO - Journal of Leukocyte Biology
JF - Journal of Leukocyte Biology
IS - 2
ER -