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      Chlorogenic acid improves high fat diet-induced hepatic steatosis and insulin resistance in mice.

      Author(s): 1 , ,
      Publication date (Electronic):
      Journal: Pharmaceutical research

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          Abstract

          Chlorogenic acid (CGA), the most abundant component in coffee, has exhibited many biological activities. The objective of this study is to assess preventive and therapeutic effects of CGA on obesity and obesity-related liver steatosis and insulin resistance.

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          Global, regional, and national prevalence of overweight and obesity in children and adults during 1980-2013: a systematic analysis for the Global Burden of Disease Study 2013.

          Marie Ng, Tom Fleming, Margaret W. Robinson … (2015)
          In 2010, overweight and obesity were estimated to cause 3·4 million deaths, 3·9% of years of life lost, and 3·8% of disability-adjusted life-years (DALYs) worldwide. The rise in obesity has led to widespread calls for regular monitoring of changes in overweight and obesity prevalence in all populations. Comparable, up-to-date information about levels and trends is essential to quantify population health effects and to prompt decision makers to prioritise action. We estimate the global, regional, and national prevalence of overweight and obesity in children and adults during 1980-2013. We systematically identified surveys, reports, and published studies (n=1769) that included data for height and weight, both through physical measurements and self-reports. We used mixed effects linear regression to correct for bias in self-reports. We obtained data for prevalence of obesity and overweight by age, sex, country, and year (n=19,244) with a spatiotemporal Gaussian process regression model to estimate prevalence with 95% uncertainty intervals (UIs). Worldwide, the proportion of adults with a body-mass index (BMI) of 25 kg/m(2) or greater increased between 1980 and 2013 from 28·8% (95% UI 28·4-29·3) to 36·9% (36·3-37·4) in men, and from 29·8% (29·3-30·2) to 38·0% (37·5-38·5) in women. Prevalence has increased substantially in children and adolescents in developed countries; 23·8% (22·9-24·7) of boys and 22·6% (21·7-23·6) of girls were overweight or obese in 2013. The prevalence of overweight and obesity has also increased in children and adolescents in developing countries, from 8·1% (7·7-8·6) to 12·9% (12·3-13·5) in 2013 for boys and from 8·4% (8·1-8·8) to 13·4% (13·0-13·9) in girls. In adults, estimated prevalence of obesity exceeded 50% in men in Tonga and in women in Kuwait, Kiribati, Federated States of Micronesia, Libya, Qatar, Tonga, and Samoa. Since 2006, the increase in adult obesity in developed countries has slowed down. Because of the established health risks and substantial increases in prevalence, obesity has become a major global health challenge. Not only is obesity increasing, but no national success stories have been reported in the past 33 years. Urgent global action and leadership is needed to help countries to more effectively intervene. Bill & Melinda Gates Foundation. Copyright © 2014 Elsevier Ltd. All rights reserved.
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            Adipocyte-specific gene expression and adipogenic steatosis in the mouse liver due to peroxisome proliferator-activated receptor gamma1 (PPARgamma1) overexpression.

            Songtao Yu, Kimihiko Matsusue, Papreddy Kashireddy … (2003)
            Peroxisome proliferator activated-receptor (PPAR) isoforms, alpha and gamma, function as important coregulators of energy (lipid) homeostasis. PPARalpha regulates fatty acid oxidation primarily in liver and to a lesser extent in adipose tissue, whereas PPARgamma serves as a key regulator of adipocyte differentiation and lipid storage. Of the two PPARgamma isoforms, PPARgamma1 and PPARgamma2 generated by alternative splicing, PPARgamma1 isoform is expressed in liver and other tissues, whereas PPARgamma2 isoform is expressed exclusively in adipose tissue where it regulates adipogenesis and lipogenesis. Since the function of PPARgamma1 in liver is not clear, we have, in this study, investigated the biological impact of overexpression of PPARgamma1 in mouse liver. Adenovirus-PPARgamma1 injected into the tail vein induced hepatic steatosis in PPARalpha(-/-) mice. Northern blotting and gene expression profiling results showed that adipocyte-specific genes and lipogenesis-related genes are highly induced in PPARalpha(-/-) livers with PPARgamma1 overexpression. These include adipsin, adiponectin, aP2, caveolin-1, fasting-induced adipose factor, fat-specific gene 27 (FSP27), CD36, Delta(9) desaturase, and malic enzyme among others, implying adipogenic transformation of hepatocytes. Of interest is that hepatic steatosis per se, induced either by feeding a diet deficient in choline or developing in fasted PPARalpha(-/-) mice, failed to induce the expression of these PPARgamma-regulated adipogenesis-related genes in steatotic liver. These results suggest that a high level of PPARgamma in mouse liver is sufficient for the induction of adipogenic transformation of hepatocytes with adipose tissue-specific gene expression and lipid accumulation. We conclude that excess PPARgamma activity can lead to the development of a novel type of adipogenic hepatic steatosis.
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              Chlorogenic Acid and Caffeic Acid Are Absorbed in Humans

              Margreet Olthof, Martijn B. Katan, Peter Hollman (2001)
              Chlorogenic acid, an ester of caffeic acid and quinic acid, is a major phenolic compound in coffee; daily intake in coffee drinkers is 0.5-1 g. Chlorogenic acid and caffeic acid are antioxidants in vitro and might therefore contribute to the prevention of cardiovascular disease. However, data on the absorption of chlorogenic acid and caffeic acid in humans are lacking. We determined the absorption of chlorogenic acid and caffeic acid in a cross-over study with 4 female and 3 male healthy ileostomy subjects. In such subjects, degradation by the colonic microflora is minimal and absorption can be calculated as the amount ingested minus the amount excreted in ileostomy effluent. The ileostomy subjects ingested 2.8 mmol chlorogenic acid and 2.8 mmol caffeic acid on separate days in random order and subsequently collected ileostomy fluid and urine for 24 h. Absorption of chlorogenic acid was 33 +/- 17% (mean +/- SD) and of caffeic acid 95 +/- 4%. Traces of the ingested chlorogenic acid and 11% of the ingested caffeic acid were excreted in urine. Thus, one third of chlorogenic acid and almost all of the caffeic acid were absorbed in the small intestine of humans. This implies that part of chlorogenic acid from foods will enter into the blood circulation, but most will reach the colon.
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                Author and article information

                Journal
                Journal ID (iso-abbrev): Pharm. Res.
                Title: Pharmaceutical research
                ISSN (Electronic): 1573-904X
                ISSN (Print): 0724-8741
                Publication date (Electronic): Apr 2015
                Volume: 32
                Issue: 4
                Affiliations
                [1 ] Department of Pharmaceutical and Biomedical Sciences, College of Pharmacy, University of Georgia, Room 450 Pharmacy South, 250 West Green Street, Athens, Georgia, 30602, USA.
                Article
                Mid ID: NIHMS630747
                DOI: 10.1007/s11095-014-1526-9
                PubMed ID: 25248334
                SO-VID: f49d7d80-483f-4467-90f6-0406cd54b0f8
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