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- Publisher Website: 10.1016/j.canlet.2020.11.002
- Scopus: eid_2-s2.0-85096136059
- PMID: 33186656
- WOS: WOS:000613281900021
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Article: PRMT6 deficiency induces autophagy in hostile microenvironments of hepatocellular carcinoma tumors by regulating BAG5-associated HSC70 stability
Title | PRMT6 deficiency induces autophagy in hostile microenvironments of hepatocellular carcinoma tumors by regulating BAG5-associated HSC70 stability |
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Authors | |
Keywords | Arginine methylation Liver cancer Protein arginine methyltransferase 6 Sorafenib Hypoxia Nutrient deprivation |
Issue Date | 2021 |
Publisher | Elsevier Ireland Ltd. The Journal's web site is located at http://www.elsevier.com/locate/canlet |
Citation | Cancer Letters, 2021, v. 501, p. 247-262 How to Cite? |
Abstract | Autophagy is a critical survival factor for cancer cells, whereby it maintains cellular homeostasis by degrading damaged organelles and unwanted proteins and supports cellular biosynthesis in response to stress. Cancer cells, including hepatocellular carcinoma (HCC), are often situated in a hypoxic, nutrient-deprived and stressful microenvironment where tumor cells are yet still able to adapt and survive. However, the mechanism underlying this adaptation and survival is not well-defined. We report deficiency of the post-translational modification enzyme protein arginine N-methyltransferase 6 (PRMT6) in HCC to promote the induction of autophagy under oxygen/nutrient-derived and sorafenib drug-induced stress conditions. Enhanced autophagic flux in HCC cells negatively correlated with PRMT6 expression, with the catalytic domain of PRMT6 critically important in mediating these autophagic activities. Mechanistically, PRMT6 physically interacts and methylates BAG5 to enhance the degradation of its interacting partner HSC70, a well-known autophagy player. The therapeutic potential of targeting BAG5 using genetic approach to reverse tumorigenicity and sorafenib resistance mediated by PRMT6 deficiency in HCC is also demonstrated in an in vivo model. The clinical implications of these findings are highlighted by the inverse correlative expressions of PRMT6 and HSC70 in HCC tissues. Collectively, deficiency of PRMT6 induces autophagy to promote tumorigenicity and cell survival in hostile microenvironments of HCC tumors by regulating BAG5-associated HSC70 stability through post-translational methylation of BAG5. Targeting BAG5 may therefore be an attractive strategy in HCC treatment by suppressing autophagy and inducing HCC cell sensitivity to sorafenib for treatment. |
Persistent Identifier | http://hdl.handle.net/10722/301617 |
ISSN | 2023 Impact Factor: 9.1 2023 SCImago Journal Rankings: 2.595 |
ISI Accession Number ID | |
Grants |
DC Field | Value | Language |
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dc.contributor.author | Che, N | - |
dc.contributor.author | Ng, KY | - |
dc.contributor.author | Wong, TL | - |
dc.contributor.author | Tong, M | - |
dc.contributor.author | Kau, PWF | - |
dc.contributor.author | Chan, LH | - |
dc.contributor.author | Lee, TK | - |
dc.contributor.author | Huen, MSY | - |
dc.contributor.author | Yun, JP | - |
dc.contributor.author | Ma, S | - |
dc.date.accessioned | 2021-08-09T03:41:41Z | - |
dc.date.available | 2021-08-09T03:41:41Z | - |
dc.date.issued | 2021 | - |
dc.identifier.citation | Cancer Letters, 2021, v. 501, p. 247-262 | - |
dc.identifier.issn | 0304-3835 | - |
dc.identifier.uri | http://hdl.handle.net/10722/301617 | - |
dc.description.abstract | Autophagy is a critical survival factor for cancer cells, whereby it maintains cellular homeostasis by degrading damaged organelles and unwanted proteins and supports cellular biosynthesis in response to stress. Cancer cells, including hepatocellular carcinoma (HCC), are often situated in a hypoxic, nutrient-deprived and stressful microenvironment where tumor cells are yet still able to adapt and survive. However, the mechanism underlying this adaptation and survival is not well-defined. We report deficiency of the post-translational modification enzyme protein arginine N-methyltransferase 6 (PRMT6) in HCC to promote the induction of autophagy under oxygen/nutrient-derived and sorafenib drug-induced stress conditions. Enhanced autophagic flux in HCC cells negatively correlated with PRMT6 expression, with the catalytic domain of PRMT6 critically important in mediating these autophagic activities. Mechanistically, PRMT6 physically interacts and methylates BAG5 to enhance the degradation of its interacting partner HSC70, a well-known autophagy player. The therapeutic potential of targeting BAG5 using genetic approach to reverse tumorigenicity and sorafenib resistance mediated by PRMT6 deficiency in HCC is also demonstrated in an in vivo model. The clinical implications of these findings are highlighted by the inverse correlative expressions of PRMT6 and HSC70 in HCC tissues. Collectively, deficiency of PRMT6 induces autophagy to promote tumorigenicity and cell survival in hostile microenvironments of HCC tumors by regulating BAG5-associated HSC70 stability through post-translational methylation of BAG5. Targeting BAG5 may therefore be an attractive strategy in HCC treatment by suppressing autophagy and inducing HCC cell sensitivity to sorafenib for treatment. | - |
dc.language | eng | - |
dc.publisher | Elsevier Ireland Ltd. The Journal's web site is located at http://www.elsevier.com/locate/canlet | - |
dc.relation.ispartof | Cancer Letters | - |
dc.subject | Arginine methylation | - |
dc.subject | Liver cancer | - |
dc.subject | Protein arginine methyltransferase 6 | - |
dc.subject | Sorafenib | - |
dc.subject | Hypoxia | - |
dc.subject | Nutrient deprivation | - |
dc.title | PRMT6 deficiency induces autophagy in hostile microenvironments of hepatocellular carcinoma tumors by regulating BAG5-associated HSC70 stability | - |
dc.type | Article | - |
dc.identifier.email | Ng, KY: jkyng@hku.hk | - |
dc.identifier.email | Wong, TL: tinlwong@hku.hk | - |
dc.identifier.email | Tong, M: caroltm@hku.hk | - |
dc.identifier.email | Kau, PWF: kwflui@hku.hk | - |
dc.identifier.email | Huen, MSY: huen.michael@hku.hk | - |
dc.identifier.email | Ma, S: stefma@hku.hk | - |
dc.identifier.authority | Tong, M=rp02568 | - |
dc.identifier.authority | Huen, MSY=rp01336 | - |
dc.identifier.authority | Ma, S=rp00506 | - |
dc.description.nature | link_to_subscribed_fulltext | - |
dc.identifier.doi | 10.1016/j.canlet.2020.11.002 | - |
dc.identifier.pmid | 33186656 | - |
dc.identifier.scopus | eid_2-s2.0-85096136059 | - |
dc.identifier.hkuros | 324083 | - |
dc.identifier.volume | 501 | - |
dc.identifier.spage | 247 | - |
dc.identifier.epage | 262 | - |
dc.identifier.isi | WOS:000613281900021 | - |
dc.publisher.place | Ireland | - |
dc.relation.project | Role of protein arginine methyltransferase 6 (PRMT6) in metabolic reprogramming in hepatocellular carcinoma | - |