3T3-L1 fibroblasts culture and differentiation were previously described in (Liu and Pilch, 2008 (link)). PTRF null and control wild type primary MEFs cells used in all experiments were maintained within 3–5 passages. When they reached 90% confluence, they were transfected with the cDNA of interest by means of the X-tremeGENE HP reagent (Roche, Indianapolis, IN). HEK293 cells were cultured and transfected as describe in (Liu and Pilch, 2008 (link)).
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