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Therefore, diagnosis is critical in the early stages. In this study, we explored the liver expression of metabotropic glutamate receptor 3 (mGluR3), a group II mGluR, during the progression from fibrosis to cirrhosis and, ultimately, to HCC induced by diethylnitrosamine (DEN) in rats. We found that mRNA expression of mGluR3 (Grm3) was upregulated in HCC, while the protein level was significantly increased from the cirrhosis stage, and even more in HCC. Grm3 correlated with interleukin-6 (Il6) and transforming growth factor-\u03b2 (Tgfb) mRNA expression. Furthermore, serum and intrahepatic glutamate concentrations were augmented in HCC. Immunohistochemical analysis revealed that mGluR3 is expressed in hepatocytes and non-parenchymal cells (endothelial cells and macrophages), and we observed a positive signal in the cytoplasmic membrane, cytoplasm, and nuclei of tumor and non-tumor cells. We confirmed that normal hepatocytes (C9 cell line) express low levels of mGluR3 protein and HCC-derived cells (HepG2) express high levels of this receptor. Using HepG2 cells, we observed that mGluR3 activation by glutamate and the group II-selective agonist LY354740 treatments were functional, as both inhibited cAMP generation induced by forskolin and increased cellular viability with no effect on dead cells. These results showed that mGluR3 is differentially expressed throughout the progression of liver pathologies, is associated with the inflammatory environment, and plays a role in HCC cell survival, with potential utility as an early biomarker and therapeutic target.<\/jats:p>","DOI":"10.3390\/ijms27093878","type":"journal-article","created":{"date-parts":[[2026,4,28]],"date-time":"2026-04-28T11:33:37Z","timestamp":1777376017000},"page":"3878","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Metabotropic Glutamate Receptor 3 Expression During Liver Disease Progression: Association with Inflammation and Cell Viability in Hepatocellular Carcinoma"],"prefix":"10.3390","volume":"27","author":[{"given":"Ana Cristina","family":"Garc\u00eda-Gayt\u00e1n","sequence":"first","affiliation":[{"name":"Departamento de Neurobiolog\u00eda Celular y Molecular, Instituto de Neurobiolog\u00eda, Universidad Nacional Aut\u00f3noma de M\u00e9xico (UNAM), Campus UNAM-Juriquilla, Juriquilla 76230, Quer\u00e9taro, Mexico"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0002-6165-8095","authenticated-orcid":false,"given":"Andy","family":"Hern\u00e1ndez-Abrego","sequence":"additional","affiliation":[{"name":"Departamento de Neurobiolog\u00eda Celular y Molecular, Instituto de Neurobiolog\u00eda, Universidad Nacional Aut\u00f3noma de M\u00e9xico (UNAM), Campus UNAM-Juriquilla, Juriquilla 76230, Quer\u00e9taro, Mexico"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Dalia","family":"De Ita-P\u00e9rez","sequence":"additional","affiliation":[{"name":"Departamento de Neurobiolog\u00eda Celular y Molecular, Instituto de Neurobiolog\u00eda, Universidad Nacional Aut\u00f3noma de M\u00e9xico (UNAM), Campus UNAM-Juriquilla, Juriquilla 76230, Quer\u00e9taro, Mexico"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9235-5199","authenticated-orcid":false,"given":"Ericka","family":"de los R\u00edos-Arellano","sequence":"additional","affiliation":[{"name":"Departamento de Neurobiolog\u00eda Celular y Molecular, Instituto de Neurobiolog\u00eda, Universidad Nacional Aut\u00f3noma de M\u00e9xico (UNAM), Campus UNAM-Juriquilla, Juriquilla 76230, Quer\u00e9taro, Mexico"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0007-2170-6861","authenticated-orcid":false,"given":"Emanuel","family":"G\u00e1mez","sequence":"additional","affiliation":[{"name":"Centro M\u00e9dico Nacional de Occidente, Instituto Mexicano del Seguro Social, Guadalajara 44340, Jalisco, Mexico"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9019-8246","authenticated-orcid":false,"given":"Mauricio","family":"D\u00edaz-Mu\u00f1oz","sequence":"additional","affiliation":[{"name":"Departamento de Neurobiolog\u00eda Celular y Molecular, Instituto de Neurobiolog\u00eda, Universidad Nacional Aut\u00f3noma de M\u00e9xico (UNAM), Campus UNAM-Juriquilla, Juriquilla 76230, Quer\u00e9taro, Mexico"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6731-9468","authenticated-orcid":false,"given":"Isabel","family":"M\u00e9ndez","sequence":"additional","affiliation":[{"name":"Departamento de Neurobiolog\u00eda Celular y Molecular, Instituto de Neurobiolog\u00eda, Universidad Nacional Aut\u00f3noma de M\u00e9xico (UNAM), Campus UNAM-Juriquilla, Juriquilla 76230, Quer\u00e9taro, Mexico"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2026,4,27]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"10041","DOI":"10.3390\/ijms130810041","article-title":"Blood glutamate scavenging: Insight into neuroprotection","volume":"13","author":"Leibowitz","year":"2012","journal-title":"Int. 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