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Expression of the Human Tissue-Plasminogen Activator in Hairy Roots of Oriental Melon (Cucumis melo)

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Abstract

The human tissue plasminogen activator (t-PA) is a thrombolytic protein that plays a key role in fibrinolysis by converting the plasminogen into plasmin which degrades fibrin clots in blood vessels. The t-PA gene encoding the human tissue plasminogen activator was cloned and expressed under transcriptional control of single and multiple rooting loci promoter (rolD) promoters in hairy roots derived from Oriental melon. t-PA gene integration in the genome of hairy roots was confirmed by PCR. Increased transcript and protein expression levels was observed in the transgenic hairy roots expressing t-PA under the control of single and dual rolD promoters, respectively. Enzyme-linked immunosorbent assay revealed the highest levels of the recombinant t-PA accumulation in transgenic hairy roots carrying the t-PA transgene under the control of single and dual rolD (0.17–0.15 μg/mg) promoters as compared to triple and quadruple rolD (0.07–0.03 μg/mg) promoters. Fibrinolytic activity indicated the proper function of the expressed recombinant t-PA in fibrin lysis. These results demonstrated that hairy roots could serve as alternatives to transgenic plants for expression of mammalian genes.

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Acknowledgments

We thank Ms. Kyung-Il Lee (NAAS) for technical assistance. This project (PJ006652) was supported by grant (to BSH) from the National Academy of Agricultural Science, RDA, Korea. This study was supported by 2011 Postdoctoral Fellowship Program (to HA) of National Academy of Agricultural Science, RDA, Korea.

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Correspondence to Bum-Soo Hahn.

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Sol Kang and Hemavathi Ajjappala equally contributed to this work.

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Kang, S., Ajjappala, H., Seo, HH. et al. Expression of the Human Tissue-Plasminogen Activator in Hairy Roots of Oriental Melon (Cucumis melo). Plant Mol Biol Rep 29, 919–926 (2011). https://doi.org/10.1007/s11105-011-0303-8

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