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 »  Abstract
 »  Introduction
 »  Materials and Me...
 »  Results
 »  Discussion
 »  References
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 Table of Contents    
Year : 2011  |  Volume : 43  |  Issue : 3  |  Page : 296-299

Effect of piperine in the regulation of obesity-induced dyslipidemia in high-fat diet rats

1 Department of Pharmacology, K.B. Raval College of Pharmacy, Gandhinagar, India
2 Department of Pharmacology, K.B. Institute of Pharm. Edu. and Research, Gandhinagar, Gujarat, India
3 Crimea Medical University, Simferopol, Ukraine

Date of Submission30-Jun-2010
Date of Decision26-Oct-2010
Date of Acceptance23-Feb-2011
Date of Web Publication24-May-2011

Correspondence Address:
Shreya S Shah
Department of Pharmacology, K.B. Raval College of Pharmacy, Gandhinagar
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/0253-7613.81516

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 » Abstract 

Objective: The present study was undertaken to explore the effect of piperine in obesity-induced dyslipidemia.
Materials and Methods: Male Sprague Dawley rats were fed high-fat diet (HFD) for the first eight weeks, to develop obesity-induced dyslipidemia. Later on piperine (40 mg / kg) and sibutramine (5 mg / kg) were administered for three weeks along with the continuation of HFD to two separate groups, which served as the test and standard groups, respectively. Body weight, food intake, serum triglyceride, total cholesterol, LDL, VLDL, and HDL were measured at the end of the fourth, eighth (before treatment), and eleventh (after treatment) week, while the fat mass was measured at the end of the eleventh week in the normal, HFD-control, test, and standard groups.
Results: Supplementing piperine with HFD significantly reduced not only body weight, triglyceride, total cholesterol, LDL, VLDL, and fat mass, but also increased the HDL levels, with no change in food intake.
Conclusion: The above results suggest that piperine possesses potential fat reducing and lipid lowering effects, without any change in food appetite, at a small dose of 40 mg / kg. The mechanism of action for such an activity needs to be determined. However, looking to structural similarity with the presently known Melanocortin-4 (MC-4) agonists, involvement of MC-4 receptors in its activity can be guessed.

Keywords: Dyslipidemia, high-fat diet, melanocortin-4, obesity, piperine

How to cite this article:
Shah SS, Shah GB, Singh SD, Gohil PV, Chauhan K, Shah KA, Chorawala M. Effect of piperine in the regulation of obesity-induced dyslipidemia in high-fat diet rats. Indian J Pharmacol 2011;43:296-9

How to cite this URL:
Shah SS, Shah GB, Singh SD, Gohil PV, Chauhan K, Shah KA, Chorawala M. Effect of piperine in the regulation of obesity-induced dyslipidemia in high-fat diet rats. Indian J Pharmacol [serial online] 2011 [cited 2023 Sep 23];43:296-9. Available from: https://www.ijp-online.com/text.asp?2011/43/3/296/81516

 » Introduction Top

Greater consumption of energy leads to an increase in the fat mass (adiposity) and fat-cell enlargement (hypertrophy), producing the characteristic pathology of obesity. [1] The rising tide of obesity is one of the most pressing health issues of our time. Increase in fat mass increases the associated risk conditions such as dyslipidemia, type 2 diabetes mellitus, and coronary heart disease, termed as excessive fat-related metabolic disorders (EFRMD). [2] The brain controls fat storage (i.e. energy homeostasis) by regulating food intake and energy expenditure. Sensory input is received from the body in the form of circulating hormones (leptin, ghrelin, etc.), fuels (glucose, fatty acids, etc.), and vagal efferents from the gut. [3] This information is integrated with clues from the outside world as well as the emotional state of the organism. The brain then initiates the appropriate alterations in food intake and energy expenditure with the ultimate goal of maintaining energy balance. Obesity develops when this system malfunctions. [4]

One of the most important of such centers is the hypothalamus, especially the arcuate nucleus. [5] Among the hypothalamic neuropeptide systems regulating feeding, melanocortins play a prominent role. [6]

Melanocortins (MC) cleaved from pro-opiomelanocortin (POMC), exert their effects by binding to the members of the melanocortin receptor family, in the brain. [7] Increase in the MC-4 receptor activity leads to a decrease in appetite, increased energy expenditure, and increased insulin sensitivity. Thus, an increase in MC-4 activity helps in reducing adiposity (obesity) and its related metabolic syndromes like dylipidemia.

Increase in MC-4 activity can be achieved by increasing CNS leptin and / or insulin activity, which is dependent upon the peripheral leptin / insulin production, transport across the blood-brain barrier, and effect upon the CNS target receptors. Melanocortin activity may also be increased by an endogenous inhibition of inverse agonists (agouti-related peptide) of melanocortin receptors. Alternatively it can also be achieved through selective melanocortin receptor agonists such as piperazine, piperidine, pyridazinone, tetrahydropyran, thiadazole, and diazole derivatives. The diminished activity of MC-4 receptors not only increases the adiposity, but also increases the risk of its associated metabolic syndromes. [8] Therefore piperine, a piperidine derivative can be used as an melanocortin agonist.

Piper nigrum commonly known as black pepper and Piper longum commonly known as long pepper are highly reputed plants in the ayurvedic system of medicine. A phytochemical review reveals the presence of piperine (1-piperoyl piperidine), the major constituent in these plants, which is isolated from its fruits. This constituent of the Piper species has been found to possess a number of therapeutic properties, mainly indicating its use as a bioavalibility enhancer. Other indications are in bronchitis, chronic cold, cough, congestion, hemorrhoids, hepatitis, arthritis, chronic dyspepsia, anorexia, chronic asthma, burning heart, colic, rheumatoid / osteoarthritis, juvenile asthma, and so on. [9] Piperine, which is 1-piperoyl piperidine, can be proposed to be used as an a melanocortin-4 agonist. In the light of above mentioned reports, the present investigation was undertaken to study the potential use of piperine in improving the lipid profile in obese animals without suppressing the appetite.

 » Materials and Methods Top


Piperine was purchased from Sigma Aldrich Co., St Louis, USA, and Sibutramine was a generous gift from Intas Pharmaceuticals Ltd, Ahmedabad. All other chemicals used were of analytical grade.


Male Sprague-Dawley rats weighing 400 - 450 g were used for the present study. They were housed in clean polypropylene cages (three rats / cage) and maintained under controlled room temperature (22 ± 2°C) and humidity (55 ± 5%), with a 12 : 12 hour light and dark cycle. All the rats were fed normal pellet diet (NPD) (commercial rat pellets) and were given water ad libitum before the dietary manipulation. The guidelines of the committee for the purpose of control and supervision of experiments on animals (CPCSEA), Government of India, were followed, and prior permission was sought from the Institutional Animal Ethics Committee for conducting the study.

Experimental Protocol

Male Sprague-Dawely rats were used for the present investigation. The rats were divided into four groups of six animals each.

Group I - Control group

Group II - High-fat diet (HFD) - control group

Group III - HFD + Piperine (suspended in 0.5% carboxy methylcellulose (CMC), p.o), for the last three weeks.

Group IV - HFD + Sibutramine (solution in deionized water, p.o.), for the last three weeks.

Group I was fed NPD, while Groups II, III, and IV were fed HFD for eleven weeks , that is, throughout the study. At the end of the eighth week, groups III and IV were treated with piperine (40 mg / kg) [10] and sibutramine (5 mg / kg), respectively, for three weeks. The composition of HFD [11] is given in [Table 1]. The following parameters were measured: physical parameters like body weight and food intake [12] and biochemical parameters. [12] At the end of the study, four rats from each group were sacrificed and the fat mass was collected and immediately weighed. [12]
Table 1: Composition of high-fat diet

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Collection of Blood Samples

At the end of the fourth, eighth, and eleventh weeks, blood was collected under inhalation anesthesia by retro-orbital puncture from overnight fasted animals. Blood was allowed to clot for 30 minutes at room temperature. Serum was separated by centrifugation at 4,000 - 5,000 rpm for 15 minutes and analyzed for serum cholesterol (CHOD-PAP), HDL (PEG-CHOD-PAP), and triglyceride (GPO-PAP) levels using the commercially available diagnostic kits (Span Diagnostics Ltd., Surat, India).

Fat-pad Analysis

At the end of the eleventh week, animals were decapitated between 09:00 and 12:00 hours.They were free to access food and water. After sacrificing by decapitation, the epididymial white adipose tissue and interscapular brown adipose tissue (BAT) were dissected out. The collected fat was weighed immediately and compared with the other groups.

Statistical Analysis

All the values were expressed as mean ± SEM, n = 6 in each group. The statistical analysis for determining the significant difference was performed using the student's paired t-test and the Tucky (one way ANOVA test) test. Value of P less than 5% (P < 0.05) was considered statistically significant.

 » Results Top

Effect of Piperine on the Physical Parameters

a. Effect of piperine on body weight

Body weight was measured every week till eleven weeks. The body weight of all the HFD groups (groups II, III, IV) was significantly increased compared to the control group (group I) for first eight weeks. Piperine-treated group showed significant reduction in body weight, by 12 - 15% as compared to the HFD-control group (P < 0.05), while the sibutramine-treated group (group IV) exhibited 35 - 40% weight reduction [Figure 1].
Figure 1: Effect of piperine on body weight in high-fat diet animals

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b. Effect of piperine on food intake

Supplementing piperine for three weeks with the HFD, exhibited no significant alteration in the food intake as compared to the HFD-control and control group (p < 0.05). Sibutramine treated group exhibited a significant reduction in food intake as compared to the HFD-control group. This indicated a protective effect of piperine in reducing body weight without any alteration in food intake [Figure 2].
Figure 2: Effect of piperine on food intake in high-fat diet animals

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Effect of Piperine on Serum Lipid Profile

Serum triglyceride, cholesterol, LDL, and VLDL levels were significantly increased, while the serum HDL level was significantly decreased in all the HFD groups for the first eight weeks compared to the control group. On treatment with piperine, serum triglyceride, cholesterol, LDL, and VLDL levels were significantly reduced, while the HDL level was significantly increased compared to the HFD control group (P < 0.05) [Table 2]. Very similar results were observed with the sibutramine treated group. Thus treatment with piperine showed a significant reduction in the lipid profile related to obesity.
Table 2: Effect of piperine on the serum lipid profile

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Fat Pad Analysis

As the animals were kept on HFD for 11 weeks, there was an accumulation of visceral, subcutaneous, and interscapular fat. There was a significant reduction in the epididymal (visceral WAT) and interscapular (BAT) fat mass in the piperine-treated group, compared to the HFD-control group [Figure 3] and [Figure 4]. This showed the protective effect of piperine in the increased fat mass condition.
Figure 3: Effect of piperine on epididymal fat mass in high-fat diet animals

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Figure 4: Effect of piperine on interscapular fat mass in high-fat diet animals

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 » Discussion Top

The present study was undertaken with a therapeutic approach to develop strategies to reduce the worldwide obesity epidemic and a research goal to develop safe and effective drugs, which will not only reduce excessive fat mass, but also its related metabolic syndromes. [13]

High-fat diet is one of the main causes leading to excessive fat mass accumulation - obesity - which in turn leads to other metabolic syndromes like dyslipidemia. [14] Thus, a high-fat diet (HFD) model was used to produce dyslipidemia similar to humans.

Increase in body weight and fat deposition are the chief indicators for the gradual progress of obesity. As the animals were fed with HFD, there was an increase in the adiposity, which in turn increased the fat cell mass. Thus, there was an overall increase in body weight. The increased body weight found in HFD rats might be due to the consumption of a diet rich in energy, in the form of saturated fats (lard) and its deposition in various body fat pads, [14] and decreased energy expenditure as compared to NPD-fed animals. [15] However, on treatment with piperine there was a significant decrease in body weight and fat mass, which proved its antiobese action.

Dyslipidemia is the most important relationship of obesity to coronary artery disease. [16] The most common characteristics of dyslipidemia related to obesity are characterized by (i) increased triglycerides, (ii) decreased HDL levels, and (iii) increased small dense LDL composition. [16] Hypercholesterolemia may be attributed to increased dietary cholesterol absorption from the small intestine following the intake of HFD . [17],[18]

Hypertriglyceridemia observed in these fat-fed rats may be due to increased absorption and formation of triglycerides, in the form of chylomicrons, following the exogenous consumption of diet rich in fat. Alternatively, it can also be through an increased endogenous production of TG-enriched hepatic very low density lipoprotein (VLDL) and decreased TG uptake in the peripheral tissues. [19]

Treatment with piperine significantly reduced not only the serum trigylyceride, total cholesterol, LDL, and VLDL levels, but also significantly increased the HDL level, which proved its beneficial effect in reducing dyslipidemia.

Thus the above results suggests that piperine significantly possesses a lipid lowering effect and anti-obesity activity without any change in appetite. The possible hypothesis, seeing to the structural similarity, is that, piperine being a piperidine derivative, works as an MC-4 receptor agonist. The other mechanism piperine possesses is the thyrogenic activity, thus modulating apolipoprotein levels and insulin resistance in HFD-fed rats, and opening a new window in the management of dyslipidemia by dietary supplementation with nutrients. [11] Moreover piperine also inhibits lipid and lipoprotein accumulation by significantly modulating the enzymes of the lipid metabolism, like Lecithin-cholesterol acyltransferase (LCAT) and Lipoprotien lipase (LPL). [20]

 » References Top

1.Fontaine KR, Redden DT, Wang C, Westfall AO, Allison DB. Years of life lost due to obesity. JAMA 2003;289:187-93.  Back to cited text no. 1
2.Kushner R, Roth J. Assessment of the obese patient. Endocrinol Metab Clin North Am 2003;32:915-33.  Back to cited text no. 2
3.Saper CB, Chou TC, Elmquist, JK. The need to feed: Homeostatic and hedonic control of eating. Neuron 2002;36:199-211.  Back to cited text no. 3
4.Balthasar N, Dalgaard LT, Lee CE, Yu J, Funahashi H, Williams T, et al. Divergence of melanocortin pathways in the control of food intake and energy expenditure. Cell 2005;123:493-505.  Back to cited text no. 4
5.Foster-Schubert KE, Cummings DE. Emerging therapeutic strategies for obesity. Endocr Rev 2006;27:779-93.  Back to cited text no. 5
6.Schwartz MW, Woods SC, Porte JD, Seeley RJ, Baskin DG. Central nervous system control of food intake. Nature 2000;404:661-71.  Back to cited text no. 6
7.Cone RD, Lu D, Koppula S, Vage DI, Klungland H, Boston B, et al. The melanocortin receptors: agonists, antagonists, and the hormonal control of pigmentation. Recent Prog Horm Res 1996;51:287-317.  Back to cited text no. 7
8.Bays H. The melanocortin system as a therapeutic treatment target for adiposity and adiposopathy. Drugs R D 2006;7:289-302.  Back to cited text no. 8
9.Sharma G, Mishra B. Piperine- A therapeutic agent and bioavalibility enhancer. J Pharm Res 2007;6:129-33.  Back to cited text no. 9
10.Vijayakumar RS, Namasivayam N. Lipid-lowering efficacy of piperine from Piper nigrum L. in high-fat diet and antithyroid drug-induced hypercholesterolemic rats. J Food Biochem 2006;30:405-21.  Back to cited text no. 10
11.Srinivasan K, Viswanad B, Lydia A, Kaul CL, Ramarao P. Combination of high-fat diet-fed and low-dose streptozotocin-treated rat: A model for type 2 diabetes and pharmacological screening. Pharmacol Res 2005;52:313-20.  Back to cited text no. 11
12.Banno R, Arima H, Hayashi M, Goto M, Watanabe M, Sato I. Central administration of melanocortin agonist increased insulin sensitivity in diet-induced obese rats. FEBS Lett 2007;581:1131-6.  Back to cited text no. 12
13.Riccardi G, Giacco R, Rivellese AA. Dietary fat, insulin sensitivity and the metabolic syndrome. Clin Nutr 2004;23:447-56.  Back to cited text no. 13
14.Srinivasan K, Patole PS, Kaul CL, Ramarao P. Reversal of glucose intolerance by pioglitazone in high-fat diet fed rats. Exp Clin Pharmacol 2004;26:327-33.  Back to cited text no. 14
15.Storlien LH, James DE, Burleigh KM, Chisholm DJ, Kraegen EW. Fat feeding causes widespread in-vivo insulin resistance, decreased energy expenditure and obesity in the rat. Am J Physiol 1986;251:E576-83.  Back to cited text no. 15
16.Despres JP, Krauss RM. Obesity and lipoprotein metabolism. In: Bray GA, Bouchard C, editors. Handbook of obesity. NewYork: Marcel Dekker; 2003. p. 41-5.  Back to cited text no. 16
17.Howard BV, Ruotolo G, Robbins DC. Obesity and dyslipidemia. Endocrinol Metab Clin North Am 2003;32:855-67.   Back to cited text no. 17
18.Shafrir E. Diabetes in animals: Contribution to the und erstanding of diabetes by study of its etiopathology in animal models. In: Porte D, Sherwin RS, Baron A, editors. Diabetes mellitus. NewYork: McGraw-Hill; 2003. p. 231-55.  Back to cited text no. 18
19.Colca JR, Dailey CF, Palazuk BJ, Hillman RM, Dinh DM, Melchior GW. Pioglitazone hydrochloride inhibits cholesterol absorption and lowers plasma cholesterol concentrations in cholesterol fed rats. Diabetes 1991;40:1669-74.  Back to cited text no. 19
20.Vijayakumar RS, Nalini N. Piperine, an active principle from Piper nigrum, modulates hormonal and apo lipoprotein profiles in hyperlipidemic rats. J Basic Clin Physiol Pharmacol 2006;17:71-86.  Back to cited text no. 20


  [Figure 1], [Figure 2], [Figure 3], [Figure 4]

  [Table 1], [Table 2]

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