Gyas Khan

Antidiabetic activity of seed extracts of Caesalpinia crista Linn. in experimental animals

The present study was designed to evaluate antidiabetic activity of ethanolic and aqueous seed extracts of Caesalpinia crista linn. in streptozotocin (STZ) induced diabetes in 2 days old pups models. The seeds were collected, authenticated and shade dried. Shade dried seeds were then grinded into coarse powder and processed for further studies. Ethanolic and aqueous extracts were prepared and the preliminary phytochemical screening was performed. Ethanolic and aqueous both extracts were evaluated for the antidiabetic activity by using the streptozotocin induced diabetes in 2 days old pups model. After 3 months of streptozotocin administration, pups become diabetic and then further protocol was proceeded. Estimation of biological parameters like serum glucose, cholesterol and triglyceride were performed and body weight, water intake and food intake were also recorded after 3 weeks of treatment. Histopathological study was performed to study the structure of islets of pancreas in different group of animals. There was a significant decrease in the biological parameters that is, serum glucose, cholesterol and triglyceride when compared with diabetic untreated group after 3 weeks treatment plant extracts. Treatment with the extracts also affected the physical parameters like decrease in body weight, increase in demand of food intake and water intake when compared with diabetic untreated group. Histopathological study shows the changes in structure of islets of pancreas in different groups of animals. Hence, it can be concluded that in the above study, both ethanolic and aqueous seed extracts of C. crista linn. showed antidiabetic activity, but the aqueous extract of C. crista linn. showed more significant effect as compared to the ethanolic extract.

Therapeutic potential of Vanillylacetone against CCl 4 induced hepatotoxicity by suppressing the serum marker, oxidative stress, inflammatory cytokines and apoptosis in Swiss albino mice

The aim of this research was to investigate the therapeutic potential of Vanillylacetone against carbon tetrachloride (CCl4) induced hepatotoxicity in mice through understanding the serum marker, oxidative stress mechanism and cytokine networks. Carbon tetrachloride is highly hepatotoxic used as research based on animal model. The mice were classified into five groups and each had eight mice. Group-I was controlled and the vehicle was given orally. Group-II was toxic and carbon tetrachloride (1.5 ml/kg) twice a week for 15 days was administered by intra-peritoneal injections. Group- III and IV were pre-treated with Vanillylacetone 50 & 100 mg kg-1 body weight given every day p.o. while, Group-V received only Vanillylacetone (100 mg kg-1 body weight) for 15 days orally. The finding indicates that the administration of CCl4 causes significant elevation of enzyme markers, oxidative stress, inflammatory cytokine and apoptotic markers in Group-II as compared to Group-I. The administration of Vanillylacetone (50 and100 mg kg-1) significantly suppresses the elevated serum enzymes, oxidative stress (TBARS), an inflammatory cytokine (IL2 and TNFα) and apoptotic markers (Caspase-3 and 9) in Group-III and IV as compared to Group-II. It was also noticed that the higher dose of Vanillylacetone (100 mg) is more effective than lower dose of Vanillylacetone (50 mg). There were no significant changes observed with higher dose of Vanillylacetone (100 mg kg-1) in Group-V as compared to Group-I. Histopathological analysis also supported the above findings. Overall, this results shows that Vanillylacetone has a good antioxidant and therapeutic properties which can help in preventing the chemically (CCl4) induced hepatotoxicity.

Thymoquinone Ameliorates Doxorubicin-Induced Cardiotoxicity in Swiss Albino Mice by Modulating Oxidative Damage and Cellular Inflammation

Thymoquinone is the active constituent of Nigella sativa, having antioxidant and anti-inflammatory actions. In present study, we have analyzed the effects of thymoquinone on doxorubicin (DOX) induced cardiotoxicity in mice. In this experiment, thirty mice (25–35 gm) were divided into five groups (Groups A, B, C, D, and E) each containing six animals. Normal saline was given to a control group (Group A) for 14 days. Cardiotoxicity was induced by DOX (15 mg/kg, i.p.) in Group B, once on the 13th day of the study, and Groups C and D also received DOX (15 mg/kg, i.p.) and were then treated with thymoquinone (10 and 20 mg/kg, b/w, p.o.), respectively, for 14 days. Group E was given only thymoquione (20 mg/kg b/w, p.o.). A blood serum marker (AST, ALT, CK-MB, and LDH) and oxidative stress marker (LPO, GSH, CAT, SOD, GPx, GR, and GST) were evaluated. Results revealed that serum enzyme marker like aspartate aminotransferase (AST), creatinine kinase-MB (CKMB), and lactate dehydrogenase (LDH) were significantly elevated in Group B as compare to Group A. Similarly, the oxidative stress marker lipid peroxidation (LPO) was also elevated in Group B while the antioxidant enzyme catalase, superoxide dismutase, glutathione peroxidase, glutathione reductase, and glutathione S-transferase (CAT, SOD, GPx, GR, and GST) were also decreased in Group B. The treatment with thymoquinone 10 and 20 mg/kg resulted in a significant decrease in the serum marker and increase in the antioxidant enzymes. In this study, we have found that thymoquinone prevented DOX-induced cardiotoxicity by accelerating heart antioxidant defense mechanisms and down regulating the LPO levels towards normalcy in Groups C and D. The effect of doxorubicin increases the inflammatory cytokine (IL2) in Group B as compared to Group A, and it overcomes by the thymoquinone in Groups C and D. Thus, thymoquinone may have utility as a potential drug for cardiomyopathy.

Antihyperglycemic, antidyslipidemic and antioxidant activity of Rhus coriaria in STZ-induced type 2 diabetic rats

The potential role of methanolic extract of Rhus coriaria L. on hyperglycemia, dyslipidemia and lipid peroxidation (LPO) was studied in type 2 diabetic rats. Type 2 diabetes was induced by a single intraperitoneal injection of streptozotocin (STZ, 100 mg/kg) to 2 days old rat pups. R. coriaria (200 and 400 mg/kg) was administered orally once a day for 5 weeks after the animals were confirmed diabetic (that is, 90 days after STZ injection). A group of citrate control rats were also maintained which has received citrate buffer on the 2 nd day of their birth. Administration of R. coriaria extract showed a significant (P < 0.001) decrease in blood glucose and tissue MDA levels as compared to type 2 diabetic control rats. The levels of total cholesterol (TCh), triglycerides (TG), low density lipoprotein cholesterol (LDL-C) and very low density lipoproteins cholesterol VLDL-C were also significantly (P < 0.001) decreased by R. coriaria treatment when compared with type 2 diabetic control rats. In contrast the high density lipoprotein cholesterol (HDL-C) levels were significantly (P < 0.001) increased after treatment with R. coriaria extract when compared with type 2 diabetic control rats. These results revealed that R. coriaria possesses significant antihyperglycemic and antidyslipidemic activity along with potent antioxidant potential in type 2 diabetic mellitus.

The combination of canagliflozin and omega-3 fatty acid ameliorates insulin resistance and cardiac biomarkers via modulation of inflammatory cytokines in type 2 diabetic rats

The present study was carried out with the hypothesis that combination of canagliflozin and omega-3 fatty acid may have potential effect on insulin level, insulin resistance, cardiac biomarkers, inflammatory cytokines and histological studies in type 2 diabetes mellitus (DM). Type 2 DM was induced by injecting nicotinamide (120 mg/kg, i.p.) 15 min before STZ (60 mg/kg) injection. Canagliflozin (5 and 10 mg/kg) and omega-3 fatty acid (300 mg/kg) were given for 28 days after confirmation of diabetes. Biochemical estimations revealed elevated levels of glucose, insulin, HOMA-R and inflammatory cytokines in diabetic group. Daily dosing of alone canagliflozin and omega-3 fatty acid slightly reduced elevated levels of glucose, insulin, HOMA-R and inflammatory cytokines (IL-1β, IL-2, and TNFα), whereas canagliflozin and omega-3 fatty acid combination has reduced these biochemical parameters significantly when compared with diabetic group. Similarly in diabetic group the levels of cardiac biomarkers such as lipid profile, LDH, CKMB and troponin were significantly increased. Elevated levels of cardiac biomarkers were significantly reduced after daily dosing of alone canagliflozin and omega-3 fatty acid. Canagliflozin and omega-3 fatty acid combination has offered better improvement in cardiac biomarkers compared to alone canagliflozin and omega-3 fatty acid. Histopathological analysis also supported the above hypothesis that combination therapy (canagliflozin and omega-3 fatty acid) offered better protection against degenerative changes in β-cells of pancreas as compared to alone treatment with these drugs. Thus the present study revealed that canagliflozin and omega-3 fatty acid can be used as potential combination therapy in type 2 DM along with cardiac complication.

Thymoquinone and fluoxetine alleviate depression via attenuating oxidative damage and inflammatory markers in type-2 diabetic rats

Abstract The study was designed to find out the effect of thymoquinone (TQ) alone and combination of TQ + fluoxetine in depression of type-2 diabetic rats. Glucose level was significantly decreased in TQ alone treated group, whereas no significant change was recorded when TQ was combined with fluoxetine. Administration of TQ alone and combination of TQ and fluoxetine significantly decreased immobility time, increased latency to immobility and increased locomotor activity. Treatment with TQ alone significantly decreased level of TBARS, increased GSH and restored the activities of antioxidant enzymes (GPx, GR & CAT). However, TQ and fluoxetine combination reduced TBARS level, increased GSH content but no change in the antioxidant enzymes activities. Inflammatory markers (IL-1β, IL-6 & TNF-α) levels were significantly reduced after the administration of TQ alone and TQ + fluoxetine. The study suggests that combination of TQ and fluoxetine can be used to control depression in type-2 diabetes mellitus.

Chapter 8 – Nanoparticle System for Anticancer Drug Delivery: Targeting to Overcome Multidrug Resistance

Drug resistance in cancer is the foremost threat in the present therapeutic era. Resistance to anticancer drugs results from a variety of factors, such as individual genetic factors, and various cellular molecular targets. Clinically, drug resistance may develop either prior to drug therapy, or due to drug therapy. Cancer cells express multiple drug resistance (MDR) by initially developing resistance to a single anticancer drug, and slowly to various anticancer agents that are structurally similar but possess different mechanisms of action. Biodegradable nanoparticle drug delivery systems emerge as promising therapeutic concepts to target cancer cells. Drug-loaded polymeric nanoparticles bypass the molecular domain responsible for the development of resistance, and deliver the drug in a controlled manner, with less adverse effects, and increased therapeutic efficacy. The topic of this chapter focuses on MDR exhibited during cancer chemotherapy, and on the influence of nanoparticles in order to overcome the MDR.