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KMID : 0606920190270010034
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Biomolecules & Therapeutics
2019 Volume.27 No. 1 p.34 ~ p.40
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Transglutaminase 2 Promotes Autophagy by LC3 Induction through p53 Depletion in Cancer Cell
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Kang Joon-Hee
Lee Seon-Hyeong
Cheong Hee-Sun
Lee Chang-Hoon
Kim Soo-Youl
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Abstract
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Transglutaminase 2 (TGase 2) plays a key role in p53 regulation, depleting p53 tumor suppressor through autophagy in renal cell carcinoma. We found that microtubule-associated protein 1A/1B-light chain 3 (LC3), a hallmark of autophagy, were tightly associated with the level of TGase 2 in cancer cells. TGase 2 overexpression increased LC3 levels, and TGase 2 knockdown decreased LC3 levels in cancer cells. Transcript abundance of LC3 was inversely correlated with level of wild type p53. TGase 2 knockdown using siRNA, or TGase 2 inhibition using GK921 significantly reduced autophagy through reduction of LC3 transcription, which was followed by restoration of p53 levels in cancer cells. TGase 2 overexpression promoted the autophagy process by LC3 induction, which was correlated with p53 depletion in cancer cells. Rapamycin-resistant cancer cells also showed higher expression of LC3 compared to the rapamycin-sensitive cancer cells, which was tightly correlated with TGase 2 levels. TGase 2 knockdown or TGase 2 inhibition sensitized rapamycin-resistant cancer cells to drug treatment. In summary, TGase 2 induces drug resistance by potentiating autophagy through LC3 induction via p53 regulation in cancer.
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KEYWORD
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Transglutaminase 2, Autophagy, LC3, p53, Cancer cell
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