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Liver damage could be prevented promoting consumption of fruits and vegetables, the main source of phenolic compounds. These molecules have been previously related with antioxidant and anti-obesity properties. Therefore, the objective of this study is to determine the antioxidant capacity and potential preventive activity of an autochthonous apple pulp extract, Amarilla de Octubre, and its main phenolic compound, procyanidin B2 (PB2), in an in vitro model of liver steatosis. Antioxidant activity was assessed by xanthine\/xanthine oxidase (X\/XO) system and nitric oxide scavenging production. Monoamine oxidase A (MAO-A) inhibition was also determined due to its implication in detoxification processes in liver. Human hepatocytes (HepG2 cell line) were selected to test their potential cytotoxicity, oxidative stress situations (ROS production) and the potential effect in lipid metabolism by overloading cells with oleic acid. Fat accumulation and gene expression related to lipid metabolism (PPAR\u03b3, CD36 and FAS) were also analysed by Oil Red O and qPCR respectively. PB2 showed promising results as an antioxidant compound in scavenging and enzymatic inhibition-related experiments. However, Amarilla de Octubre not only reduce fat accumulation, but also modulates the expression of PPAR\u03b3, CD36, and FAS and demonstrates slightly lower efficacy than PB2 in scavenging and enzymatic inhibition-related experiments. These results highlight the potential of apples to mitigate pathogenic conditions associated with metabolic disorders such as obesity, emphasizing the role of dietary polyphenols in this protective effect.<\/jats:p>","DOI":"10.1007\/s13105-026-01151-9","type":"journal-article","created":{"date-parts":[[2026,1,23]],"date-time":"2026-01-23T07:58:54Z","timestamp":1769155134000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Procyanidin B2 and an autochthonous apple pulp extract modulate oxidative stress and PPAR\u03b3 expression on an in vitro model of lipid steatosis in HepG2 cells"],"prefix":"10.1007","volume":"82","author":[{"given":"Adri\u00e1n","family":"Mill\u00e1n-Laleona","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Marta","family":"Lopez-Yus","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Silvia","family":"Lorente-Cebri\u00e1n","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jose M.","family":"Arbones-Mainar","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Carlota","family":"G\u00f3mez-Rinc\u00f3n","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"V\u00edctor","family":"L\u00f3pez","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2026,1,23]]},"reference":[{"issue":"Suppl","key":"1151_CR1","doi-asserted-by":"publisher","first-page":"S17","DOI":"10.3350\/cmh.2022.0367","volume":"29","author":"C Gofton","year":"2023","unstructured":"Gofton C, Upendran Y, Zheng MH, George J (2023) Mafld: how is it different from nafld? 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