Nuclear receptor coactivator 4 (NCOA4) also named androgen receptor (AR) coactivator ARA70, RFG and ELE1, is a putative co-activator that specifically enhances the activity of the androgen receptor. In human thyroid carcinomas, the Ret proto-oncogene fuses to ARA70 to form Ret/PTC3 by an intrachromosomal inversion of chromosome 10 in vivo. ARA70a can function as a ligand-enhanced co-activator of PPARg in adipocytes. However, PPARg-ARA70 transactivation can be squelched by AR, which suggests cross talk between PPARg- and AR-mediated response. ARA70a has no intrinsic transcription activation domain or histone acetyltransferase activity, but it interacts with histone acetyltransferase, p/CAF, CBP and p300/CBP-associated factors, and the basal transcription factor TFIIB. The interaction between ARA70 and AR occurs through the ligand-binding domain. The presence of ARA70 can enhance the androgenic activity of 17-b Estradiol (E2) and antiandrogens toward AR. ARA70 may be involved in prostate carcinogenesis and ovarian cancer and may serve as a key mediator of estrogen-androgen synergism.There are several isoforms of ZGPAT that are produced as a result of alternative splicing events. ARA70a is widely expressed, and its expression is highest in testis and adipose tissues, whereas ARA70b (The shorter variant, results from an internal 985-bp deletion.) is solely expressed in the testis.This antibody is a rabbit polyclonal antibody raised against the N-400aa of human NCOA4 protein.