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A dahlia flower extract has antidiabetic properties by improving insulin function in the brain

Life Metabolism 2023年第4期2卷 39-50页

作者： Dominik Pretz Philip M.Heyward Jeremy Krebs Joel Gruchot Charles Barter Pat Silcock Nerida Downes Mohammed Zubair Rizwan Alisa Boucsein Julia Bender Elaine J.Burgess geke aline boer Pramuk Keerthisinghe Nigel B.Perry Alexander Tups Centre for Neuroendocrinology School of Biomedical SciencesUniversity of OtagoDunedin 9054New Zealand Department of Physiology School of Biomedical SciencesUniversity of OtagoDunedin 9054New Zealand Maurice Wilkins Centre for Molecular Biodiscovery University of AucklandAuckland 1010New Zealand Department of Medicine University of OtagoWellingtonWellington South 6242New Zealand Centre for Endocrine Diabetes and Obesity Research Wellington Regional HospitalNewtownWellington 6021New Zealand Product Development Research Centre University of OtagoDunedin 9054New Zealand Department of Chemistry The New Zealand Institute for Plant and Food ResearchUniversity of OtagoDunedin 9054New Zealand

Butein,a rare chalcone found in the toxic plant Toxicodendron vernicifluum,has been shown to regulate glucose homeostasis via inhibition of the nuclear factor kappa-B kinase subunit beta(IKKβ)/nuclear factor kappa B(NF-κB)pathway in the ***,we investigated whether the nonpoisonous plant Dahlia pinnata could be a source of butein as a potential treatment for type 2 diabetes(T2D).In mice fed a high-fat diet(HFD)to induce glucose intolerance,an oral *** petal extract improved glucose tolerance at doses of 3.3 mg/kg body weight and 10 mg/kg body ***,this effect was not mediated by butein alone but by butein combined with the closely related flavonoids,sulfuretin and/or ***,the extract improved systemic insulin *** of phosphatidylinositol 3-kinase to block insulin signaling in the brain abrogated the glucoregulatory effect of the orally administered *** extract reinstated central insulin signaling and normalized astrogliosis in the hypothalamus of HFD-fed *** NF-κB reporter zebrafish to determine IKKβ/NF-κB activity,a potent anti-inflammatory action of the extract was found.A randomized controlled crossover clinical trial on participants with predia-betes or T2D confirmed the safety and efficacy of the extract in *** conclusion,we identified an extract from the flower petals of *** as a novel treatment option for T2D,potentially targeting the central regulation of glucose homeostasis as a root cause of the disease.

关键词： inflammation hypothalamus signal transduction neuroendocrine arcuate nucleus

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Effect of gestational protein restriction on left ventricle hypertrophy and heart angiotensin II signaling pathway in adult offspring rats

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Health 2013年第4期5卷 78-84页

作者： Renan Brisolla da Silva Flavia Fernandes Mesquita Marilia Andreo Heloisa Balan Assalin Jose Antonio Rocha Gontijo Patricia aline boer Fetal Programming Laboratory Department of MorphologyBotucatu Bioscience InstituteUNESP-Sao Paulo State UniversityBotucatuBrazil Hydro-Saline Metabolism Laboratory Internal Medicine DepartmentFaculty of Medical SciencesState University of CampinasCampinasBrazil

Maternal protein restriction may be a risk factor for cardiovascular disorders in adulthood. The RAS (renin-angiotensin-system) plays a pivotal role in cardiac remodeling. Components of the RAS, including angiotensin II (AngII) and its receptors type 1 (AT1R) and 2 (AT2R) are expressed in the heart. This study investigates whether gestational protein restriction alters the expression and localization of AT1R and AT2R and RAS signaling pathway proteins in parallel with left ventricle hypertrophy and systemic hypertension in male offspring. Dams were kept on normal (NP, 17% protein) or low (LP, 6% protein) protein diet during pregnancy. Systolic blood pressure (SBP) of male offspring was measured from the 8th to 16th week and left ventricles of 16-wk-old rats were processed for histology, morphometric, immunoblotting and immunohistochemistry. LP offspring showed a significant reduction in birth body weight and SBP increased significantly from the 8th week. Left ventricle mass and cardiomyocytes area were also significantly higher in LP animals. Widespread perivascular fibrosis was not detected in the heart tissue. Analysis by immunoblotting and immunohistochemistry demonstrated a significant enhance in cardiomyocyte expression of AT1R and ERK1 in LP offspring. Expression of PI3K in LP was significantly reduced in cardiomyocytes and in the intramural coronary wall, while AT2R expression was unchanged in the NP group. We also found reduced LP expression of JAK2 and STAT3. In conclusion, our data also suggest that changes in the RAS may play a role in the ventricular growth through upregulation of the AT1-mediated ERK1/2 response, despite unchanged AT2R expression.

关键词： Low Birth Weight Arterial Hypertension Fetal Programming Protein Restriction Angiotensin II Left Ventricle Hypertrophy Cardiovascular Disease

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