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BioMed Research International
Volume 2013 (2013), Article ID 241721, 7 pages
Research Article

The Escherichia coli-Derived Thymosin β4 Concatemer Promotes Cell Proliferation and Healing Wound in Mice

Plant Biotechnology Research Center, School of Agriculture and Biology, Fudan-SJTU-Nottingham, Plant Biotechnology R and D Center, Shanghai Jiao Tong University, Shanghai 200240, China

Received 21 January 2013; Revised 5 April 2013; Accepted 17 April 2013

Academic Editor: Youngjun Choi

Copyright © 2013 Xiaolei Wang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Thymosin β4 (Tβ4) is one of the most promising thymosins for future clinical applications, and it is anticipated that commercial demand for Tβ4 will increase. In order to develop a new approach to produce recombinant Tβ4, a 168 bp DNA (termed 4) was designed based on the Tβ4 protein sequence and used to express a 4 × 4 concatemer (four tandem copies of Tβ4, termed 4 × Tβ4) together with a histidine tag (6 × His) in E. coli (strain BL21). SDS-PAGE and western blot analysis were used to confirm that a recombinant 4 × Tβ4 protein of the expected size (30.87 kDa) was produced following the induction of the bacterial cultures with isopropyl β-D-thiogalactoside (IPTG). The E. coli-derived 4 × 4 was purified by Ni-NTA resin, and its activities were examined with regard to both stimulating proliferation of the mice spleen cells in vitro and in vivo wound healing. The results demonstrate that these activities of the E. coli-derived recombinant 4 × Tβ4 were similar or even better than existing commercially obtained Tβ4. This production strategy therefore represents a potentially valuable approach for future commercial production of recombinant Tβ4.