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Merz, L.M.* ; Winter, K.* ; Richter, S.* ; Kallendrusch, S.* ; Horn, A.* ; Grunewald, S.* ; Klöting, N. ; Krause, K.* ; Kiess, W.* ; Le Duc, D.* ; Garten, A.*

Effects of alpelisib treatment on murine Pten-deficient lipomas.

Adipocyte 14:2468275 (2025)
Publ. Version/Full Text Research data DOI PMC
Open Access Gold
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 Phosphatase and tensin homolog (PTEN) hamartoma tumour syndrome (PHTS) is a rare disorder caused by germline mutations in the tumour suppressor gene PTEN, a key negative regulator of phosphatidylinositol 3-kinase (PI3K)/AKT signalling. Children with PHTS often develop lipomas, for which only surgical resection is available as treatment. We investigated the effects of the selective PI3K-inhibitor alpelisib on Pten-deficient lipomas. After incubation with alpelisib or the non-selective PI3K inhibitor wortmannin, we analysed histology, gene expression, and Pi3k pathway in lipoma and control epididymal adipose tissue (epiWAT). Alpelisib increased adipocyte area in lipomas compared to epiWAT. Baseline gene expression showed higher levels of markers for proliferation (Pcna), fibrosis (Tgfb1), and adipogenesis (Pparg) in lipomas, while hormone-sensitive lipase expression was lower than in epiWAT. Following alpelisib incubation, target genes of Pi3k signalling and extracellular matrix factors were reduced. We confirmed Pi3k inhibition through detecting decreased Akt levels compared to control treatment. Human lipoma samples treated with alpelisib showed variable lipolysis responses, suggesting variability in therapeutic outcomes. We established an ex vivo model to study alpelisib effects on Pten-deficient lipomas. These results underscore the therapeutic potential of targeted PI3K inhibition in the treatment of PHTS-associated lipomas, particularly in cases that are inoperable.
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Publication type Article: Journal article
Document type Scientific Article
Keywords Adipose Tissue ; Phosphatase And Tensin Homolog ; Phosphatidylinositol 3-kinase ; Tissue Slice Culture ; Wortmannin; Phosphatidylinositol 3-kinase; Mammalian Target; Lipolysis; Kinase; Inhibition; Wortmannin; Docetaxel; Rapamycin; Promotes; Insulin
Language english
Publication Year 2025
HGF-reported in Year 2025
ISSN (print) / ISBN 2162-3945
e-ISSN 2162-397X
Journal Adipocyte
Quellenangaben Volume: 14, Issue: 1, Pages: , Article Number: 2468275 Supplement: ,
Publisher Landes Bioscience
Publishing Place 530 Walnut Street, Ste 850, Philadelphia, Pa 19106 Usa
Reviewing status Peer reviewed
Institute(s) Helmholtz Institute for Metabolism, Obesity and Vascular Research (HI-MAG)
POF-Topic(s) 30201 - Metabolic Health
Research field(s) Helmholtz Diabetes Center
PSP Element(s) G-506500-001
Grants Animal Core Facilities of the Leipzig University Faculty of Medicine and Saxon Incubator for Clinical Translation
German Research Foundation (Deutsche Forschungsgemeinschaft, DFG)
DOI 10.1080/21623945.2025.2468275
WOS ID 001424458100001
Scopus ID 85219319855
PubMed ID 39962643
Erfassungsdatum 2025-04-01
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