GPCR Function in Autophagy Control: A Systematic Approach of Chemical Intervention

• Published in: Journal of molecular biology Vol. 436; no. 15; p. 168643
• Main Authors: Sanz-Martinez, Pablo, Tascher, Georg, Cano-Franco, Sara, Cabrerizo-Poveda, Paloma, Münch, Christian, Homan, Evert J., Stolz, Alexandra
• Format: Journal Article
• Language: English
• Published: Netherlands Elsevier Ltd 01-08-2024
• Subjects: chemical screens; chemogenomic library; G-protein coupled receptor GPCR; induction of autophagy; Medicin och hälsovetenskap; signal transduction; TMT-based whole cell proteomics; G-protein coupled receptor GPCR; signal transduction; TMT-based whole cell proteomics; induction of autophagy; chemical screens; chemogenomic library
• ISSN: 0022-2836; 1089-8638; 1089-8638
• DOI: 10.1016/j.jmb.2024.168643

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•Characterization of 77 selected GPCR ligands in an autophagy flux assay.•TMT-based whole cell proteomics of selected, autophagy inducing ligands.•Comprehensive resource data set for further research on GPCRs' involvment in autophagy.
Autophagy facilitates the degradation of cellular content via the lysosome and is involved in cellular homeostasis and stress response pathways. As such, malfunction of autophagy is linked to a variety of diseases ranging from organ-specific illnesses like cardiomyopathy to systemic illnesses such as cancer or metabolic syndromes. Given the variety of autophagic functions within a cell and tissue, regulation of autophagy is complex and contains numerous positive and negative feedback loops. While our knowledge of mechanisms for cargo selectivity has significantly improved over the last decade, our understanding of signaling routes activating individual autophagy pathways remains rather sparse. In this resource study, we report on a well-characterized chemical library containing 77 GPCR-targeting ligands that was used to systematically analyze LC3B-based autophagy as well as ER-phagy flux upon compound treatment. Upon others, compounds TC-G 1004, BAY 60-6583, PSNCBAM-1, TC-G 1008, LPA2 Antagonist 1, ML-154, JTC-801 and ML-290 targeting adenosine receptor A2a (ADORA2A), adenosine receptor A2b (ADORA2B), cannabinoid receptor 1 (CNR1), G-protein coupled receptor 39 (GPR39), lysophosphatidic acid receptor 2 (LPAR2), neuropeptide S receptor 1 (NPSR1), opioid related nociceptin receptor 1 (OPRL1), and relaxin receptor 1 (RXFP1), respectively, were hit compounds for general autophagy flux. From these compounds, only JTC-801 markly increased ER-phagy flux. In addition, the global impact of these selected hit compounds were analyzed by TMT-based mass spectrometry and demonstrated the differential impact of targeting GPCRs on autophagy-associated proteins. This chemical screening exercise indicates to a significant cross-talk between GPCR signaling and regulation of autophagy pathways.