Detection of ERα, ERβ, MyoD, p53, or CtBP1 transcriptional
complex, respectively, by co-IP assays. The process was described under
“Experimental Procedures.” A, cell lysates extracted from
ERα-overexpressing MCF-7 cells were subjected to immunoprecipitation
with IgG or ERα antibody followed by immunoblotting with ERα, CBP,
p300, MyoD, Sp1, or ERβ antibody, respectively. B, cell lysates
extracted from ERβ-overexpressing MCF-7 cells were subjected to
immunoprecipitation with IgG or ERβ antibody followed by immunoblotting
with ERα, CBP, p300, MyoD, Sp1, or ERβ antibody, respectively.
C, cell lysates extracted from MyoD-overexpressing MCF-7 cells were
subjected to immunoprecipitation with IgG or MyoD antibody followed by
immunoblotting with MyoD, p68, p72, ERα, or ERβ antibody,
respectively. D, cell lysates extracted from p53-overexpressing MCF-7
cells were subjected to immunoprecipitation with IgG or p53 antibody followed
by immunoblotting with HDAC1, CtBP1, Sp1, or p53 antibody, respectively.
E, cell lysates extracted from CtBP1-overexpressing MCF-7 cells were
subjected to immunoprecipitation with IgG or CtBP1 antibody followed by
immunoblotting with HDAC1, p53, CtBP1, and CtBP2 (Santa Cruz Biotechnology,
Inc.) antibodies, respectively.