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DNA Methyltransferase 3 A (DNMT3A) is an important facilitator of differentiation of both embryonic and hematopoietic stem cells. Heterozygous germline mutations in DNMT3A lead to Tatton-Brown-Rahman Syndrome (TBRS), characterized by obesity and excessive height. While DNMT3A is known to impact feeding behavior via the hypothalamus, here we investigated a role in adipocyte progenitors utilizing heterozygous knockout mice that recapitulate cardinal TBRS phenotypes. These mice become morbidly obese due to adipocyte enlargement and tissue expansion. Adipose tissue in these mice exhibited defects in preadipocyte maturation and precocious activation of inflammatory gene networks, including interleukin-6 signaling. Adipocyte progenitor cell lines lacking DNMT3A exhibited aberrant differentiation. Furthermore, mice in which Dnmt3a was specifically ablated in adipocyte progenitors showed enlarged fat depots and increased progenitor numbers, partly recapitulating the TBRS obesity phenotypes. Loss of DNMT3A led to constitutive DNA hypomethylation, such that the DNA methylation landscape of young adipocyte progenitors resemble that of older wild-type mice. Together, our results demonstrate that DNMT3A coordinates both the central and local control of energy storage required to maintain normal weight and prevent inflammatory obesity.

BackgroundProstate cancer (PCa) is one of the prevalent malignant tumors among men. It can progress to castration-resistant prostate cancer (CRPC), which is significantly more challenging to treat. Saikosaponin A (SSA), a triterpenoid saponin extracted from the genus Bupleurum, exerts numerous pharmacological effects, including anti-inflammatory and anti-tumorigenic effects. However, the mechanism underlying the effects of SSA in prostate cancer treatment remains elusive.MethodsIn this study, a network pharmacology approach was applied to identify relevant targets from drug- and disease-related databases, and intersections were analyzed using Venny2.1 to construct a Protein-Protein interaction (PPI) interaction network. Next, Gene Ontology (GO) and Kyoto Encyclopedia of Genes and Genomes (KEGG) enrichment analyses were performed to elucidate associated biological functions and signaling pathways. Meanwhile, molecular docking between core targets and SSA was performed using Autodock software. Lastly, in vitro experiments were performed for validation.ResultsA least of four key targets, namely BCL2 apoptosis regulator (BCL2), estrogen receptor 1 (ESR1), hypoxia-inducible factor 1 subunit alpha (HIF1A), and signal transducer and activator of transcription 3 (STAT3) were identified in this study, and molecular docking analyses revealed that SSA stably binds to these targets. Moreover, the results of in vitro experiments revealed that SSA significantly inhibited the proliferative and migratory abilities of PC3 cells in a dose-dependent manner. Finally, SSA also induced G1-phase blockade and apoptosis in PC3 cells, further highlighting its potential role in prostate cancer treatment.ConclusionThe present study revealed that SSA exerts anti-tumorigenic effects in prostate cancer by targeting multiple pathways, laying a theoretical reference for its use as a therapeutic candidate for prostate cancer.