New paradigm in cancer pathogenesis revealed that microenvironmental conditions significantly contribute to cancer. Hence, Warburg stated that cancer is a metabolic disease. Chlorogenic acid (CGA) is a polyphenol that is found abundantly in coffee. This compound has proven ability in ameliorating some metabolic diseases through various pathways. This article will elaborate the potency of CGA as a chemosensitizer in suppressing tumor growth through a metabolic pathway. AMPK pathway is the main cell metabolic pathway that is activated by CGA in some studies. Moreover, CGA inhibited EGFR/PI3K/mTOR, HIF, VEGF pathways and MAPK/ERK pathway that may suppress tumor cell growth. Furthermore, CGA induced intracellular DNA damage and topoisomerase I- and II-DNA complexes formation that plays a key role in apoptosis. Conclusively, based on the ability of CGA in activate and inhibit some important pathways in cancer metabolism, it may act as a chemosensitizing agent leading to cancer growth suppression.

Background: Individually, green tea and green coffee have been extensively studied for mitigation of metabolic syndrome (MS) in both rats and humans; however, their combined effect requires further investigation. Thus, we compared the metabolic effect of combining green tea and decaffeinated light roasted green coffee on MS in rats. Methods: An MS animal model was constructed by feeding Sprague-Dawley rats with a high-fat-high-sucrose (HFHS) diet for eight weeks and a low dose of streptozotocin (STZ) injection at week 2. Rats fed with HFHS diets and injected with STZ successfully developed MS phenotypes, indicated by higher body weight, systolic blood pressure, plasma triglyceride level, plasma fasting blood glucose level, and lower plasma HDL-C level, compared to those fed with a normal chow diet. Subsequently, MS rats were continuously fed with HFHS and divided into four groups: MS rats, MS with 300 mg/bw.t green tea extract (GT), MS with 200 mg/bw.t green coffee extract (GC), and MS with combined green tea and green coffee extract (CM) for nine weeks. Results: Combining green tea and green coffee have synergistic effects on reducing plasma fasting blood glucose and triglyceride level. Inflammatory markers both in plasma and liver tissue robustly decreased in CM group rats. However, the reduction of systolic blood pressure was observed only in GT and CM groups. Moreover, all treatment resulted in an increase in plasma HDL-C level in MS rats. Conclusions: Our data highlighted that, in MS animal models, combined green tea and decaffeinated light roasted green coffee augment their several individual beneficial effects of improved metabolic parameters and modulated inflammatory genes.

Objective: The objective of this study is to investigate the effect of light-roasted green coffee bean extract (GCE) administration for 7 weeks on the improvement of metabolic profile, adiponectin level, homeostatic model assessment insulin resistance (HOMA-IR) index in metabolic syndrome (MS) rat model. Methods:Adult male Sprague-Dawley rats were induced by a combination of high sucrose and high-fat diet for 8 weeks and streptozotocin injection in the 2 nd week. The MS was confirmed by NCEP-ATP III criteria. They were divided into six weight-matched groups (n=5), normal control, MS, metformin and simvastatin-treated group (DMS), 100 and 200/body weight (bw) GCE (GCE 100 and GCE 200, respectively). The extracts were given through oral gavage daily for 7 weeks. The effect of GCE on body weight, serum glucose, triglyceride, (TG) and high-density lipoprotein (HDL) level was analyzed by colorimetric method. HOMA-IR index and adiponectin were analyzed by enzyme-linked immunosorbent assay methods.Result: Fasting blood glucose, TG, and systolic blood pressure decreased significantly (p<0.05) in both GCE groups. Moreover, after 7 weeks, those parameters were significantly lower (p<0.05) compared to that of MS group. Only GCE 100 group that showed a significant decrease in HDL level. GCE 100 mg/bw and 200 mg/bw group showed significantly higher adiponectin level compared to that of MS and DMS group. Furthermore, GCE 100, GCE 200, and DMS group showed a significant lower HOMA-IR index compared to that of MS group. Conclusion: 7 weeks GCE administration could decrease fasting blood glucose, profile lipid, blood pressure, and improved adiponectin level and HOMA-IR index.

The study was designed to establish an experimental models of metabolic syndrome that adequately mimic metabolic syndrome criteria as determined by NCEP ATP III.Eighteen Male Sprague dawley rats, 2 -3 months old were used in the study. Combination of high fat and high sucrose (HFHS) diet for eight weeks and streptozotocin (STZ) injection in the second week was administered to induce metabolic syndrome. The body weight and biochemical parameters (blood glucose, triglyceride, HDL-cholesterol) were measured every 2 weeks. The rats with blood glucose (>126mg/dL), triglyceride (TG) (>150mg/dL), high systolic blood pressure (≥140 mmHg), and reduced HDL levels (<40 mg/dL) confirmed presence NCEP-ATP III criteria of metabolic syndrome. The adiponectin level was analyzed by ELISA methods.Fasting blood glucose, triglyceride, and systolic blood pressure increased significantly (p<0.05) in HFHS group compared to that of NC group. Moreover, after 8 week a significant lower HDL level was observed in HFHS group compared to that of NC group. In addition, HFHS group showed a significantly lower adiponectin level compared to that of NC group.The combination of low doses of STZ (30mg/kg) and HFHS administration for 8 weeks could induce metabolic syndrome mimicking human criteria of metabolic syndrome.

Vascular endothelial cells have a variety of functions such as the control of blood coagulation, vascular permeability, and tone regulation, as well as quiesce of immune cells. Endothelial dysfunction is a cardiovascular events predictor, which is considered the initial stage in atherosclerosis development. It is characterized by alterations in endothelium functions due to imbalanced vasodilators and vasoconstrictors, procoagulant and anticoagulant mediators, as well as growth inhibitor and promotor substances. Chlorogenic acid (CGA) is the primary polyphenol in coffee and some fruits. It has many health-promoting properties, especially in the cardiovascular system. Many studies investigated the efficacy and mechanism of this compound in vascular health. CGA has several vascular benefits such as anti-atherosclerosis, anti-thrombosis, and anti-hypertensive. This review focuses on the molecular mechanism of CGA in vascular health.