Figure 2.
Ubiquitin-specific protease 50 (USP50) is increased during erythropoiesis. (A) Total RNA was extracted from human CD34+ hematopoietic progenitor cells (HPCs) on day 1 and day 3 of erythroid differentiation. Real-time quantitative PCR was used to compare ubiquitin-specific protease mRNA levels. Amplification of each sample was normalized to its glyceraldehyde-3-phosphate dehydrogenase (GAPDH) transcript levels. Shown are the ratios of day 3/day 1 in a representative experiment from five independent experiments. (B) Total RNAs were extracted on days 1, 3, 5, and 9 from HPCs. USP50 mRNA levels were measured by real-time qPCR. Shown are data in a representative experiment from five independent experiments. (C) Whole cell lysates were made from HPCs on days 0, 1, 3, 5, and 9 of erythroid differentiation. USP50 and β-actin proteins were detected by immunoblot. Representative blots were shown from five independent experiments.