Abstract:
:When treated with T3, P19 cells differentiate into ultrastructurally proven cardiac myocytes and express the cardiac ventricular specific marker ventricular myosin light chain 2V. This differentiation is irreversibly induced in culture during the first 48 hrs of exposure to T3. We studied the binding of P19-indigenous transcription factors of the Steroid-Thyroid-Retinoic superfamily of nuclear receptors to oligonucleotide response elements bearing direct, inverted and palindromic repeats of the consensus sequence RGG(T/A)CA. Electrophoretic mobility shift assays showed a preference in T3-treated P19 cells for binding RGG(T/A)CA "half sites" in direct repeat orientation separated by 4 base pairs. The specificity of binding was confirmed in competition experiments. This finding suggests that target genes bearing thyroid response elements spaced by 4 base pairs in their promoter regions play an important role in the cardiac differentiation induced by T3 in P19 teratocarcinoma cells.
journal_name
Biochem Biophys Res Communjournal_title
Biochemical and biophysical research communicationsauthors
Rodriguez ER,Tan CD,Onwuta US,Parrillo JEdoi
10.1006/bbrc.1994.2892subject
Has Abstractpub_date
1994-12-30 00:00:00pages
1899-906issue
3eissn
0006-291Xissn
1090-2104pii
S0006291X84728920journal_volume
205pub_type
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