Q135450486
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BACKGROUND: The complexity of the galaninergic system is still not fully understood, especially under specific pre-existing comorbidities related to metabolic dysfunction. A plant-derived triterpenoid celastrol was demonstrated to exert a complex effect on the galaninergic system and to have hepatoprotective and anti-obesity properties. However, the exact molecular mechanisms responsible for these effects remain unclear. Specifically, there are no data on the impact of celastrol on the heart and liver galaninergic system. Therefore, this study aimed to investigate the effects of celastrol on the galaninergic system expression in the heart and liver of mice suffering from diet-induced obesity and metabolic dysfunction-associated steatotic liver disease and steatohepatitis (MASLD/MASH). METHODS: The male mice C57BL/6J were fed a Western-type high-fat diet for 16 and 20 weeks to induce obesity and MASLD/MASH. Celastrol was administered along with a specific diet for the last 4 weeks to evaluate its impact on the progression of these conditions. Moreover, the inhibitor of sterol regulatory element-binding protein 1/2 (SREBP1/2), fatostatin, was also tested to compare its influence on the galaninergic system with celastrol. RESULTS: The study demonstrates that celastrol treatment was safe and led to a reduction in food and energy intake, body fat and liver weights, and MASLD-to-MASH progression and improved glucose tolerance, serum biochemistry markers, and hepatic lipid peroxidation in mice. Quantitative gene expression originally showed significant regulation of galanin and all three of its receptors (GalR1/2/3) in the heart ventricles and only GalR2 in the liver of obese mice. Celastrol influenced the gene expression of galanin receptors: it downregulated Galr1 in the heart and upregulated Galr2 in the liver and Galr3 in the heart ventricles, potentially affecting energy metabolism, oxidative stress, and inflammation. Fatostatin suppressed gene expression of all the detected members of the galaninergic system in the heart ventricles, depicting the role of SREBP in this process. CONCLUSION: These findings suggest that celastrol may beneficially modulate the galaninergic system under obesity and MASLD-to-MASH progression, indicating its potential as a therapeutic agent for disorders associated with metabolic dysfunction.
- Publikační typ
- časopisecké články MeSH
Background: Ivacaftor is a modern drug used in the treatment of cystic fibrosis. It is highly lipophilic and exhibits a strong positive food effect. These characteristics can be potentially connected to a pronounced lymphatic transport after oral administration. Methods: A series of studies was conducted to describe the basic pharmacokinetic parameters of ivacaftor in jugular vein cannulated rats when dosed in two distinct formulations: an aqueous suspension and an oil solution. Additionally, an anesthetized mesenteric lymph duct cannulated rat model was studied to precisely assess the extent of lymphatic transport. Results: Mean ± SD ivacaftor oral bioavailability was 18.4 ± 3.2% and 16.2 ± 7.8%, respectively, when administered as an aqueous suspension and an oil solution. The relative contribution of the lymphatic transport to the overall bioavailability was 5.91 ± 1.61% and 4.35 ± 1.84%, respectively. Conclusion: Lymphatic transport plays only a minor role in the process of ivacaftor intestinal absorption, and other factors are, therefore, responsible for its pronounced positive food effect.
- Publikační typ
- časopisecké články MeSH
AIM: Currently available medicines have little to offer in terms of supporting the regeneration of injured hepatic cells. Previous experimental studies have shown that resveratrol and metformin, less specific activators of AMP-activated protein kinase (AMPK) and sirtuin 1 (SIRT1), can effectively attenuate acute liver injury. The aim of this experimental study was to elucidate whether modulation of AMPK and SIRT1 activity can modify drug/paracetamol (APAP)-induced hepatocyte damage in vitro. METHODS: Primary rat hepatocytes were pretreated with mutual combinations of specific synthetic activators and inhibitors of SIRT1 and AMPK and followed by a toxic dose of APAP. At the end of cultivation, medium samples were collected for biochemical analysis of alanine-aminotransferase and nitrite levels. Hepatocyte viability, thiobarbituric reactive substances, SIRT1 and AMPK activity and protein expression were also assessed. RESULTS: The harmful effect of APAP was associated with decreased AMPK and SIRT1 activity and protein expression alongside enhanced oxidative stress in hepatocytes. The addition of AMPK activator (AICAR) or SIRT1 activator (CAY10591) significantly attenuated the deleterious effects of AMPK inhibitor (Compound C) on the hepatotoxicity of APAP. Furthermore, CAY10591 but not AICAR markedly decreased the deleterious effect of APAP in combination with SIRT1 inhibitor (EX-527). CONCLUSION: Our findings demonstrate that decreased AMPK activity is associated with the hepatotoxic effect of APAP which can be significantly attenuated by the administration of a SIRT1 activator. These findings suggest that differentiated modulation of AMPK and SIRT1 activity could therefore provide an interesting and novel therapeutic opportunity in the future to combat hepatocyte injury.
- MeSH
- cyklopentany farmakologie MeSH
- hepatocyty * metabolismus MeSH
- krysa rodu rattus MeSH
- lékové postižení jater * etiologie genetika metabolismus patologie MeSH
- paracetamol toxicita MeSH
- proteinkinasy aktivované AMP * chemie metabolismus farmakologie MeSH
- sirtuin 1 * metabolismus farmakologie MeSH
- zvířata MeSH
- Check Tag
- krysa rodu rattus MeSH
- zvířata MeSH
- Publikační typ
- časopisecké články MeSH
Statiny jsou všeobecně uznávaná hypolipidemika, která v důsledku inhibice reduktázy hydroxymetylglutaryl koenzymu A inhibují syntézu. Významně snižují kardiovaskulární riziko. S jejich užíváním se pojí i nežádoucí účinky, které bývají závažné jen ve vzácných případech. Nezdravý životní styl, obezita, elevace krevních lipidů však nepoškozuje pouze kardiovaskulární aparát. Aktuálním tématem vnitřního lékařství je nealkoholové ztukovatění jater (NAFLD). Jsou uvedeny pleiotropní účinky statinů, které by v budoucnu mohly být využity v terapii tohoto onemocnění. Poslední studie naznačují, že podávání statinů u pacientů s NAFLD je výhodné.
Statins are widely accepted hypolipidemics that work by inhibiting hydroxymethylglutaryl coenzyme A reductase and thereby inhibiting cholesterol synthesis. They significantly reduce cardiovascular risk. Their use could be associated with side effects, which are serious only in rare cases. However, an unhealthy lifestyle, obesity, and elevation of blood lipids do not only damage the cardiovascular system. The current topic not only in hepatology is non-alcoholic fatty liver disease – NAFLD. The aim of this article is, among others, to draw attention to the pleiotropic effects of statins, which could be used in the treatment of this disease in the future. Recent studies have suggested that the administration of statins to patients with NAFLD is beneficial.
Currently, non-alcoholic fatty liver disease (NAFLD) progressing into chronic non-alcoholic steatohepatitis (NASH), liver cirrhosis, and eventually hepatocellular cancer has emerged as an epidemiological concern due to lack of proven treatment. Our review briefly comprises of the mechanism of pathogenesis and inflammation corresponding to the disease, and all the offered insights of mechanistic pathways that could be targeted in the progression of NASH. The review principally focuses on mTOR (mammalian target of rapamycin) as a promising target highlighting its immense role in lipogenesis and alleviating inflammation and fibrosis. A detailed description of signaling pathways of mTORC1 and mTORC2 that are inhibited by rapamycin and other mTOR inhibitor analogues is accentuated. The exploration of mTOR inhibitors clearly explains the exigent molecular aspects of mTOR in regulating adipocyte and lipogenic marker genes (e.g. those encoding PPARγ, SREBP1c). The literature on available mTOR inhibitors and their classification so far could be extremely useful in highlighting mTOR as a favorable drug target in the indication of NASH in the near future.
- MeSH
- hepatocelulární karcinom * patologie MeSH
- jaterní cirhóza patologie MeSH
- játra metabolismus MeSH
- lidé MeSH
- nádory jater * patologie MeSH
- nealkoholová steatóza jater * metabolismus MeSH
- TOR serin-threoninkinasy metabolismus MeSH
- Check Tag
- lidé MeSH
- Publikační typ
- časopisecké články MeSH
- přehledy MeSH
Development of a new dug is a very lengthy and highly expensive process since only preclinical, pharmacokinetic, pharmacodynamic and toxicological studies include a multiple of in silico, in vitro, in vivo experimentations that traditionally last several years. In the present review, we briefly report some examples that demonstrate the power of the computer-assisted drug discovery process with some examples that are published and revealing the successful applications of artificial intelligence (AI) technology on this vivid area. Besides, we address the situation of drug repositioning (repurposing) in clinical applications. Yet few success stories in this regard that provide us with a clear evidence that AI will reveal its great potential in accelerating effective new drug finding. AI accelerates drug repurposing and AI approaches are altogether necessary and inevitable tools in new medicine development. In spite of the fact that AI in drug development is still in its infancy, the advancements in AI and machine-learning (ML) algorithms have an unprecedented potential. The AI/ML solutions driven by pharmaceutical scientists, computer scientists, statisticians, physicians and others are increasingly working together in the processes of drug development and are adopting AI-based technologies for the rapid discovery of medicines. AI approaches, coupled with big data, are expected to substantially improve the effectiveness of drug repurposing and finding new drugs for various complex human diseases.
- MeSH
- algoritmy MeSH
- lidé MeSH
- objevování léků * MeSH
- strojové učení MeSH
- umělá inteligence * MeSH
- Check Tag
- lidé MeSH
- Publikační typ
- časopisecké články MeSH
- přehledy MeSH
