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It is characterised by onset of cardiac structural and functional impairments and can lead to direct development of clinical heart failure (HF) or predispose to hypertensive\/ischaemic stress. DbCM is a complex disease which involves several metabolic and pathogenic factors. We characterised an established high-fat diet\/streptozotocin (HFD\/STZ)-induced DbCM model incorporating typical features of human disease to determine its suitability for preclinical evaluation of novel therapeutics prior to advancement to human trials. Male C57BL\/6J mice were randomised to HFD and single-dose STZ (100\u00a0mg\/kg) or control diet (CD) and vehicle. HFD\/STZ mice developed type 2 diabetes mellitus (T2DM), reflected by high fasting blood glucose and HbA1c levels, reduced \u03b2-cell function, and increased insulin resistance without systolic blood pressure alteration. Furthermore, HFD\/STZ mice displayed progressive diastolic dysfunction, evidenced by decreased MV E\/A ratio, together with elevated chronic left ventricular (LV) filling pressure parameters, measured by left atrial (LA) area and LA volume, compared to controls, in parallel with LV hypertrophy and fibrosis. Monocyte trafficking into diabetic hearts was identified by single-nuclei RNA sequencing analysis, which revealed an interferon-\u03b1 response in DbCM mice, whilst plasma proteomics confirmed the involvement of inflammatory processes with elevated plasma C-reactive protein in DbCM progression. Taken together, our HFD\/STZ-induced DbCM model exhibits a unique DbCM pre-clinical phenotype reflecting a \"triple-hit\" of human DbCM features comprising (1) T2DM with insulin resistance, (2) progressive diastolic dysfunction and LV remodelling, and (3) metabolic inflammation. This improved HFD\/STZ-induced DbCM model supports clinically relevant research on DbCM progression from early stages to cardiac dysfunction and remodelling as the basis for translational investigation.<\/jats:p>","DOI":"10.1186\/s13098-025-01913-3","type":"journal-article","created":{"date-parts":[[2025,8,14]],"date-time":"2025-08-14T05:13:24Z","timestamp":1755148404000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":9,"title":["Deep phenotyping of a modified diabetic cardiomyopathy mouse model which reflects clinical disease progression"],"prefix":"10.1186","volume":"17","author":[{"given":"Narainrit","family":"Karuna","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lauren","family":"Kerrigan","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kevin","family":"Edgar","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Oisin","family":"Cappa","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"David","family":"Simpson","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Claire","family":"Tonry","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"David J.","family":"Grieve","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chris J.","family":"Watson","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2025,8,14]]},"reference":[{"issue":"1","key":"1913_CR1","doi-asserted-by":"publisher","first-page":"31","DOI":"10.1007\/s11154-010-9131-7","volume":"11","author":"S Boudina","year":"2010","unstructured":"Boudina S, Abel ED. 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