Suppression of pyruvate dehydrogenase kinase by dichloroacetate in cancer and skeletal muscle cells is isoform specific and partially independent of HIF-1α

Škorja, Nives (avtor), Dolinar, Klemen (avtor), Miš, Katarina (avtor), Matkovič, Urška (avtor), Bizjak, Maruša (avtor), Pavlin, Mojca (avtor), Podbregar, Matej (avtor), Pirkmajer, Sergej (avtor)

Inhibition of pyruvate dehydrogenase kinase (PDK) emerged as a potential strategy for treatment of cancer and metabolic disorders. Dichloroacetate (DCA), a prototypical PDK inhibitor, reduces the abundance of some PDK isoenzymes. However, the underlying mechanisms are not fully characterized and may differ across cell types. We determined that DCA reduced the abundance of PDK1 in breast (MDA-MB-231) and prostate (PC-3) cancer cells, while it suppressed both PDK1 and PDK2 in skeletal muscle cells (L6 myotubes). The DCA-induced PDK1 suppression was partially dependent on hypoxia-inducible factor-1α (HIF-1α), a transcriptional regulator of PDK1, in cancer cells but not in L6 myotubes. However, the DCA-induced alterations in the mRNA and the protein levels of PDK1 and/or PDK2 did not always occur in parallel, implicating a role for post-transcriptional mechanisms. DCA did not inhibit the mTOR signaling, while inhibitors of the proteasome or gene silencing of mitochondrial proteases CLPP and AFG3L2 did not prevent the DCA-induced reduction of the PDK1 protein levels. Collectively, our results suggest that DCA reduces the abundance of PDK in an isoform-dependent manner via transcriptional and post-transcriptional mechanisms. Differential response of PDK isoenzymes to DCA might be important for its pharmacological effects in different types of cells.

• Jezik: Angleški jezik
• Ključne besede: skeletal muscle cells, cancer, dichloroacetate, pyruvate dehydrogenase kinase, pyruvate dehydrogenase complex, myotubes
• Vrsta gradiva: Članek v reviji
• Tipologija: 1.01 - Izvirni znanstveni članek
• Organizacija: MF - Medicinska fakulteta ; FE - Fakulteta za elektrotehniko; FFA - Fakulteta za farmacijo
• Status publikacije: Objavljeno
• Različica publikacije: Objavljena publikacija
• Leto izida: 2021
• Št. strani: 26 str.
• Številčenje: Vol. 22, iss. 16, art. 8610
• PID: 20.500.12556/RUL-135749
• UDK: 616-006
• ISSN pri članku: 1422-0067
• DOI: 10.3390/ijms22168610
• COBISS.SI-ID: 72730115
• Datum objave v RUL: 30.03.2022

Gradivo je del revije

• Naslov: International journal of molecular sciences
• Skrajšan naslov: Int. j. mol. sci.
• Založnik: MDPI
• ISSN: 1422-0067
• COBISS.SI-ID: 2779162

Licence

• Licenca: CC BY 4.0, Creative Commons Priznanje avtorstva 4.0 Mednarodna
• Povezava: http://creativecommons.org/licenses/by/4.0/deed.sl
• Opis: To je standardna licenca Creative Commons, ki daje uporabnikom največ možnosti za nadaljnjo uporabo dela, pri čemer morajo navesti avtorja.
• Začetek licenciranja: 10.08.2021

Sekundarni jezik

• Jezik: Slovenski jezik
• Ključne besede: celice skeletnih mišic, rak, dikloroacetat