Asian Pacific Journal of Tropical Biomedicine

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Objective: To enhance the pharmaceutical potential and oral bioavailability of quercetin contents of Allium cepa peel extract by novel nanosuspension technology. Methods: Nanoprecipitation approach was successfully used for the formulation of nanosuspension. To obtain pharmaceutical-grade nanosuspension with minimum particle size and polydispersity index, sodium lauryl sulphate was selected as a stabilizer. Important formulation parameters were statistically optimized by the response surface methodology approach. The optimized nanosuspension was subjected to stability and in vitro dissolution testing and characterized by scanning electron microscopy, atomic force microscopy, Fourier transform infrared spectroscopy, and zeta sizer. To evaluate the preeminence of nanosuspension over coarse suspension, comparative bioavailability studies were carried out in male albino rats. The pharmaceutical potential of developed nanosuspension was evaluated by antioxidant, antimicrobial, and toxicity studies. Results: The optimized nanosuspension showed an average particle size of 275.5 nm with a polydispersity index and zeta potential value of 0.415 and -48.8 mV, respectively. Atomic force microscopy revealed that the average particle size of nanosuspension was below 100 nm. The formulated nanosuspension showed better stability under refrigerated conditions. Nanosuspension showed an improved dissolution rate and a 2.14-fold greater plasma concentration of quercetin than coarse suspension. Moreover, the formulated nanosuspension exhibited enhanced antioxidant and antimicrobial potential and was non-toxic. Conclusions: Optimization of nanosuspension effectively improves the pharmaceutical potential and oral bioavailability of Allium cepa extract.

Objective: To investigate the antioxidative and antidiabetic effects of Harpephyllum caffrum bark infusion as well as its effects on glucogenic and nucleotide hydrolyzing enzyme activities in FeSO₄- induced oxidative stress in rat hepatic tissue. Methods: Harpephyllum caffrum infusion was prepared from dried plant materials (40 g) infused in boiling water (400 mL) for 20 min at room temperature. The antioxidative and inhibitory activities against carbohydrate digestive enzymes of the infusion were determined using established protocols. The liver tissues of rats were used for glucose uptake assay and to evaluate the infusion’s effect on endogenous antioxidant, glucogenic, and nucleotide hydrolyzing enzyme activities in FeSO₄-induced hepatic injury. Results: The Harpephyllum caffrum infusion significantly reduced ferric iron (FRAP) and free radicals (OH^• and DPPH) in a dose- dependent manner. It inhibited α-amylase and α-glucosidase activities and increased glucose uptake in hepatic tissues. FeSO₄ significantly decreased glutathione concentration, catalase, and superoxide dismutase activities while increasing malondialdehyde level, glycogen phosphorylase, fructose-1,6-bisphosphatase, and adenosine triphosphatase activities. However, treatment with Harpephyllum caffrum infusion reversed FeSO₄-induced changes. Characterization of the infusion revealed the presence of catechol, O-pyrocatechuic acid, mequinol, maltol, and glycoside derivatives. Conclusions: The Harpephyllum caffrum infusion demonstrates antidiabetic and antioxidative potentials in in vitro models of type 2 diabetes as depicted by its ability to inhibit carbohydrate digestive enzymes, mitigate oxidative imbalance, and regulate glucogenic and nucleotide hydrolyzing enzyme activities in oxidative hepatic injury.

Objective: To investigate the effect of piperine on human breast cancer cells. Methods: The effect of piperine on proliferation and migration of human breast cancer cells, MCF-7 and MDA-MB-231, was investigated using colony formation assays, wound healing assays, Matrigel migration assays, flow cytometry, RT-qPCR, and Western blotting assays. Results: Piperine inhibited the growth of MCF-7 and MDA-MB-231 cells and suppressed colony formation. Cell reduction at the G₀/ G₁ phase and cell arrest at the G₂/M phase were observed in breast cancer cells. However, the significant effect was only demonstrated in MDA-MB-231 cells. Moreover, cancer cell migration was suppressed by piperine at low concentration. RT-qPCR and Western blotting assays showed that piperine downregulated Rac1 gene and protein expression. Conclusions: Piperine could inhibit growth and migration of breast cancer cells by reducing Rac1 gene and protein expression.

Objective: To explore the effect of ethyl acetate gum resin extract of Boswellia serrata on lipopolysaccharide (LPS) induced inflammation and oxidative damage in hepatic and renal tissues of rats. Methods: The rats were divided into four groups: control, LPS, LPS+Boswellia serrata extracts (100 mg/kg and 200 mg/kg). LPS (1 mg/kg) and the extract (100 and 200 mg/kg, 30 min before LPS) were administered intraperitoneally for 3 weeks. The levels of liver enzymes, albumin, total protein, creatinine, blood urea nitrogen (BUN), interleukin (IL)-6, malondialdehyde (MDA), and total thiol groups and superoxide dismutase (SOD) and catalase (CAT) activities were measured. Results: The levels of liver enzymes, creatinine, and BUN, IL-6, MDA in the LPS group were markedly increased (P<0.001) while albumin, total protein, and total thiol concentration, as well as SOD and CAT activities, were decreased compared with the control group (P<0.05 or 0.01). Boswellia serrata extracts diminished the levels of liver enzymes, creatinine, BUN, IL-6, and MDA (P<0.01 and P<0.001), and elevated the concentration of total protein and total thiol and SOD and CAT activities (P<0.05 or 0.01). Conclusions: The ethyl acetate gum resin extract of Boswellia serrata reduces LPS-induced inflammatory reactions and oxidative damage, thus ameliorating hepatic and renal function.

MicroRNAs (miRNAs), small non-coding RNAs, play important roles in regulating host defense against pathogenic infections. This review provides information on the role of miRNAs in the antimycobacterial immune response and summarizes their possible diagnostic utility. It was compiled using scientific literature retrieved from such databases as PubMed, Scopus, ScienceDirect, Google Scholar, and PubMed Central. Relevant articles published in the English language until December 2020 were taken into consideration. It has been revealed that specific host miRNAs induced by Mycobacterium tuberculosis can target diverse factors and pathways in immune signaling to ensure longer pathogen survival inside the phagocytes. The potential use of miRNAs in tuberculosis diagnosis or therapeutic strategies has been attracting increasing attention in recent years. However, despite considerable efforts devoted to miRNA profiling, further studies are needed to elucidate the full potential of miRNAs as novel tuberculosis biomarkers or therapeutic targets.

Online since 13^th December 2017