Ravi Sonkar

Indole-Based Fibrates as Potential Hypolipidemic and Antiobesity Agents

Hypolipidemic and antiobesity effects of the newly synthesized indole-based fibrates were evaluated in Triton WR-1339 and high fat diet (HFD)-induced hyperlipidemic rats. Preliminary screening of all the synthesized compounds was done by using an acute model (Triton model), in which compounds 3f and 3l showed significant antidyslipidemic activity. Furthermore, these compounds 3f and 3l were found to induce significant weight loss in the visceral fat mass of HFD-fed hyperlipidemic rats without affecting the normal feeding behavior. Histological examination of the liver of rats supplemented with 3f and 3l revealed a significant decrease in steatosis when compared to the effect of the standard drug fenofibrate. Additional effects such as an increase in lecithin cholesterol acyl-transferase (LCAT) enzyme level and increased receptor mediated catabolism of I(131)-low density lipoproteins (LDL) confirm and reinforce the efficacy of both of these compounds as a new class of dual-acting hypolipidemic and antiobesity agents.

Synthesis and anti-inflammatory activity of novel biscoumarin–chalcone hybrids☆

A series of synthesized novel biscoumarin-chalcone hybrids were evaluated for their anti-inflammatory and antioxidant activity. The tested compounds significantly inhibit the carrageenin induced paw oedema in albino rats and also exhibit important scavenging activities. These compounds thus constitute an interesting template for the design of new therapeutic tools against inflammation.

Novel Coumarin derivatives as potential antidyslipidemic agents

A series of novel benzocoumarin derivatives were synthesized and evaluated for their in vivo antidyslipidemic and in vitro antioxidant activities. Among 11 compounds tested, 2 compounds showed potent antidyslipidemic activity and 3 compounds showed potent antioxidant activity.

Coumarin chalcone fibrates: a new structural class of lipid lowering agents.

In our continuing search for safe and efficacious antidyslipidemic agents, structurally interesting coumarin-chalcone fibrates were synthesized and evaluated in triton WR-1339 induced hyperlipidemic rats. The most active compound 41 decreased the total cholesterol (TC), phospholipids (PL) and triglycerides (TG), of hyperlipidemic rats by 26, 24, and 25% respectively. In addition, the compound 41 significantly reversed the levels of VLDL, LDL HDL and also increased the LPL activity. Altogether, our data suggests that these novel hybrids would be a potential new class of therapeutic agents against dyslipidemia.

Synthesis of new andrographolide derivatives and evaluation of their antidyslipidemic, LDL-oxidation and antioxidant activity

Andrographis paniculata, native to Taiwan, Mainland China and India, is a medicinal herb, which possesses various biological activities including anti-atherosclerosis. Andrographolide (1) has been identified as one of the active constituents against atherosclerosis. In continuation of our drug discovery program we synthesized few novel derivatives of 1 to improve their antidyslipidemic, LDL-oxidation and antioxidant activity. The tosylated derivative 7 has been turned out to be more potent than the parent compound and comparable activity with marketed antidyslipidemic drugs.

Discovery of amide based fibrates as possible antidyslipidemic and antioxidant agents

A novel series of amide based fibrates were synthesized and evaluated for antidyslipidemic activity in triton induced hyperlipidemic rats. Interestingly, the compound 13 produced striking reduction in serum levels of total cholesterol (TC), phospholipids (PL) and triglycerides (TG). In addition, it exhibited improved lipoprotein lipase activity and found to possess moderate radical scavenging potential. The results of the above studies shows that the compounds synthesized on fibrate based pharmacophores might result in identification of new lead for dyslipidemia.

Lipid lowering and antioxidant activity of flavones in triton treated hyperlipidemic rats

Flavones are plant derived polyphenolic compounds which are consumed by our diet. Epidemiological studies indicating that high dietary intake of flavones reduces the risk of mortality due to coronary heart disease. The lipid lowering action of flavones—myricetin, rutin, naringenin-7-rhamnoglucosides and naringenin hydrates has been studied in triton treated hyperlipidemic rats (in vivo) and antioxidant activity (in vitro). Among these myricetin and naringenin hydrate showed potent antidyslipidemic and antioxidant activities. The antidyslipidemic and antioxidant activities of these flavones may help in prevention of hyperlipidemia and related cardiovascular diseases.

Synthesis of new N-acryl-1-amino-2-phenylethanol and N-acyl-1-amino-3-aryloxypropanols and evaluation of their antihyperlipidemic, LDL-oxidation and antioxidant activity.

As a part of our drug discovery program, we identified an alkaloidal amide i.e. Aegeline (V) isolated from the leaves of Aegle marmelos as a dual acting agent (antihyperlipidemic and antihyperglycemic). In continuation of this program, we synthesized new N-acyl-1-amino-2-alcohols (N-acrylated-1-amino-2-phenylethanol and N-acylated-1-amino-3-aryloxypropanols) via Ritter reaction and screened for their in-vivo antihyperlipdemic activity in Triton induced hyperlipidemia model, LDL-oxidation and antioxidant activity. Compounds 3, 11 and 13 showed good antihyperlipidemic activity, LDL-oxidation as well as antioxidant activity and comparable activity with marketed antidyslipidemic drug.

Antihyperlipidemic and antioxidant activities of Bruguiera cylindrinca (L)

Background: Atheroclerosis is the major cause of morbidity and mortality world wide. The drugs used these days have some or other side effects. Aim: Therefore it is an urgent need to develop a safe and cheaper drugs for the society. We have planned this study to investigate lipid lowering and antioxidant activities of Bruguiera cylindrinca in triton and cholesterol fed rats. Materials and Methods: Different extract and fractions were collected from B. cylindrica. Two major compounds were isolated from there and have been tested for their lipid lowering activity along with increase in high density lipoprotein,cholesterol, compared with the cholesterol fed animals. Results: On chronic feeding of active fraction and pure compounds (at 100 mg / kg b.w.) for 30 days. The pure compounds isolated from the active fraction were found showing lipid lowering activity similar to the fraction. Conclusion: Structre modification of the two pure compounds isolated from the active fraction is required for further enhacement of biological activity.

Hybrids of coumarin–indole: design, synthesis and biological evaluation in Triton WR-1339 and high-fat diet induced hyperlipidemic rat models

In this study, a series of coumarin–indole hybrids have been synthesized and evaluated for their lipid lowering activity. Preliminary biological screening of the synthesized compounds was undertaken in an in vitro model of the HMG-CoA reductase enzyme, and the activity was confirmed in Triton WR-1339 induced hyperlipidemic rats. Among the hybrids, compound 26 was found to be the best as it significantly reduced the serum and hepatic lipid profiles in an HFD-fed hyperlipidemic rat model. The mechanism of action seems to be associated with the regulation of HMG-CoA reductase activity in the liver, which is in good agreement with binding mode studies. Compound 26 exhibited favorable pharmacokinetic behavior for its oral administration, which underscores the potential of this template as a new class of hypolipidemic agents.