Andrographolide nanophytosomes exhibit enhanced cellular delivery and pro-apoptotic activities in HepG2 liver cancer cells.

Andrographolide (AG), a major active constituent of Andrographis paniculata, is known to hinder proliferation of several types of cancer cells. However, its poor solubility and cellular permeability restrict its use in clinical applications. In this study, AG-loaded phytosomes (AG-PTMs) were formulated and optimized with respect to particle size using l-α-phosphatidylcholine (PC):AG ratio and sonication time (ST) as independent variables. The optimized formula was prepared at 1:2.7 for AG:PC molar ratio and 4.9 min for ST and exhibited a particle size of 243.7 ± 7.3 nm, polydispersity index (PDI) of 0.310 and entrapment efficiency of 72.20 ± 4.53. Also, the prepared formula showed a slow release of AG over 24-h period. The antiproliferative activity of AG-PTMs was investigated against the liver cancer cell line HepG2. AG-PTMs significantly repressed the growth of HepG2 cells with an IC50 value of 4.02 ± 0.14 µM. AG uptake by HepG2 cells was significantly enhanced in incubations containing the optimized formula. AG-PTMs also caused G2-M cell cycle phase arrest and increased the fraction of apoptotic cells in pre-G1 phase. These effects were associated with induction of oxidative stress and mitochondrial dysfunction. In addition, AG-PTMs significantly upregulated mRNA expression of BAX and downregulated that of BCL2. Furthermore, AG-PTMs significantly enhanced the concentration of caspase-3 in comparison to raw AG. These data indicate that the phytosomal delivery of AG significantly inhibited HepG2 cell proliferation through enhanced cellular uptake, arresting cell cycle at the G2-M phase and inducing mitochondrial-dependent apoptosis.

The combined effect of honey and olive oil against methotrexate mediated hepatotoxicity in rats: A biochemical, histological and immunohistological study.

BACKGROUND: Honey and olive oil are natural products that have high nutritional values, and therapeutic properties. Cytotoxic drugs, like methotrexate (MTX) are used to treat malignancies in tumour cells; however, these drugs also have serious side effects that could threaten the patient's life. AIM: To evaluate the potential protective effects of honey and olive oil, administered alone or together, against MTX-induced hepatotoxicity in rats. METHODS: Adult male albino rats were divided: Group I: negative control (n=8); II: honey ( daily by oral 1.2 g/kg bwt (n=8), III: olive oil (1 ml/day)(n=8), IV: single intraperitoneal injection of MTX (20 mg/kg bwt)(n=8), V: diluted honey for 3 days before injection of MTX (n=8), Group VI: olive oil for 3 days before injection of MTX (n=8), Group VII: both honey and olive oil for 3 days before injection of MTX (n=8). After treatment, rats were sacrified and blood samples were collected to determine liver function parameters, liver tissue used to measure the oxidative (malondialdehyde), antioxidative parameters (superoxide dismutase, catalase and glutathione peroxidase), histological and immunohistochemical techniques. RESULTS: The administration of honey and olive oil exerted a protective effect against MTX-induced hepatotoxicity, as demonstrated by the normalization of the liver enzymes, proteins and total bilirubin and by the histopathological and immunohistological changes observed in the livers. Both agents also reversed the oxidative damage in the liver by decreasing level of MDA levels and increasing the antioxidant related by enzymes in the liver homogenates compared to the control rats. These effects were more evident when the two agents were administered together. CONCLUSION: The combined intake of honey and olive oil could be hepatoprotective. Co-administration of these agents might form an effective adjuvant therapy and minimize side effects of chemoherapy in cancerous patients.

Antimicrobial activities of chicken ß-defensin (4 and 10) peptides against pathogenic bacteria and fungi.

Host Defense Peptides (HDPs) are small cationic peptides found in several organisms. They play a vital role in innate immunity response and immunomodulatory stimulation. This investigation was designed to study the antimicrobial activities of ß-defensin peptide-4 (sAvBD-4) and 10 (sAvBD-4) derived from chickens against pathogenic organisms including bacteria and fungi. Ten bacterial strains and three fungal species were used in investigation. The results showed that the sAvBD-10 displayed a higher bactericidal potency against all the tested bacterial strains than that of sAvBD-4. The exhibited bactericidal activity was significant against almost the different bacterial strains at different peptide concentrations except for that of Pseudomonas aeruginosa (P. aeruginosa) and Streptococcus bovis (Str. bovis) strains where a moderate effect was noted. Both peptides were effective in the inactivation of fungal species tested yielding a killing rate of up to 95%. The results revealed that the synthetic peptides were resistant to salt at a concentration of 50 mM NaCl. However, they lost antimicrobial potency when applied in the presence of high salt concentrations. Based on blood hemolysis studies, a little hemolytic effect was showed in the case of both peptides even when applied at high concentrations. The data obtained from this study indicated that synthetic avian peptides exhibit strong antibacterial and antifungal activity. In conclusion, future work and research should be tailored to a better understanding of the mechanisms of action of those peptides and their potential use in the pharmaceutical industry to help reduce the incidence and impact of infectious agent and be marketed as a naturally occurring antibiotic.

Detection of phytochrome-like genes from Rhazya stricta (Apocynaceae) using de novo genome assembly.

Phytochrome-like genes in the wild plant species Rhazya stricta Decne were characterized using a de novo genome assembly of next generation sequence data. Rhazya stricta contains more than 100 alkaloids with multiple pharmacological properties, and leaf extracts have been used to cure chronic rheumatism, to treat tumors, and in the treatment of several other diseases. Phytochromes are known to be involved in the light-regulated biosynthesis of some alkaloids. Phytochromes are soluble chromoproteins that function in the absorption of red and far-red light and the transduction of intracellular signals during light-regulated plant development. De novo assembly of the nuclear genome of R. stricta recovered 45,641 contigs greater than 1000bp long, which were used in constructing a local database. Five sequences belonging to Arabidopsis thaliana phytochrome gene family (i.e., AtphyABCDE) were used to identify R. stricta contigs with phytochrome-like sequences using BLAST. This led to the identification of three contigs with phytochrome-like sequences covering AtphyA-, AtphyC- and AtphyE-like full-length genes. Annotation of the three sequences showed that each contig consists of one phytochrome-like gene with three exons and two introns. BLASTn and BLASTp results indicated that RsphyA mRNA and protein sequences had homologues in Wrightia coccinea and and Solanum tuberosum, respectively. RsphyC-like mRNA and protein sequence were homologous to Vitis vinifera and Vitis riparia. RsphyE-like mRNA coding and protein sequences were homologous to Ipomoea nil. Multiple-sequence alignment of phytochrome proteins indicated a homology with 30 sequences from 23 different species of flowering plants. Phylogenetic analysis confirmed that each R. stricta phytochrome gene is related to the same phytochrome gene of other flowering plants. It is proposed that the absence of phyB gene in R. stricta is due to RsphyA gene taking over the role of phyB.

Thymoquinone causes multiple effects, including cell death, on dividing plant cells.

Thymoquinone (TQ) is a major constituent of Nigella sativa oil with reported anti-oxidative activity and anti-inflammatory activity in animal cells. It also inhibits proliferation and induces programmed cell death (apoptosis) in human skin cancer cells. The present study sought to detect the influence of TQ on dividing cells of three plant systems and on expression of Bcl2-associated athanogene-like (BAG-like) genes that might be involved during the process of cell death. BAG genes are known for the regulation of diverse physiological processes in animals, including apoptosis, tumorigenesis, stress responses, and cell division. Synthetic TQ at 0.1mg/mL greatly reduced wheat seed germination rate, whereas 0.2mg/mL completely inhibited germination. An Evans blue assay revealed moderate cell death in the meristematic zone of Glycine max roots after 1h of TQ treatment (0.2mg/mL), with severe cell death occurring in this zone after 2h of treatment. Light microscopy of TQ-treated (0.2mg/mL) onion hairy root tips for 1h revealed anti-mitotic activity and also cell death-associated changes, including nuclear membrane disruption and nuclear fragmentation. Transmission electron microscopy of TQ-treated cells (0.2mg/mL) for 1h revealed shrinkage of the plasma membrane, leakage of cell lysate, degradation of cell walls, enlargement of vacuoles and condensation of nuclei. Expression of one BAG-like gene, previously associated with cell death, was induced 20 min after TQ treatment in Glycine max root tip cells. Thus, TQ has multiple effects, including cell death, on dividing plant cells and plants may serve as a useful system to further investigate the mechanisms underlying the response of eukaryotic cells to TQ.

Control of glycerol biosynthesis under high salt stress in Arabidopsis.

Loss-of-function and gain-of-function approaches were utilised to detect the physiological importance of glycerol biosynthesis during salt stress and the role of glycerol in conferring salt tolerance in Arabidopsis. The salt stress experiment involved wild type (WT) and transgenic Arabidopsis overexpressing the yeast GPD1 gene (analogue of Arabidopsis GLY1 gene). The experiment also involved the Arabidopsis T-DNA insertion mutants gly1 (for suppression of glycerol 3-phosphate dehydrogenase or G3PDH), gli1 (for suppression of glycerol kinase or GK), and act1 (for suppression of G3P acyltransferase or GPAT). We evaluated salt tolerance levels, in conjunction with glycerol and glycerol 3-phosphate (G3P) levels and activities of six enzymes (G3PDH, ADH (alcohol dehydrogenase), ALDH (aldehyde dehydrogenase), GK, G3PP (G3P phosphatase) and GLYDH (glycerol dehydrogenase)) involved in the glycerol pathway. The GPD1 gene was used to overexpress G3PDH, a cytosolic NAD+-dependent key enzyme of cellular glycerol biosynthesis essential for growth of cells under abiotic stresses. T2 GPD1-transgenic plants and those of the two mutants gli1 and act1 showed enhanced salt tolerance during different growth stages as compared with the WT and gly1 mutant plants. These results indicate that the participation of glycerol, rather than G3P, in salt tolerance in Arabidopsis. The results also indicate that the gradual increase in glycerol levels in T2 GPD1-transgenic, and gli1 and act1 mutant plants as NaCl level increases whereas they dropped at 200mM NaCl. However, the activities of the G3PDH, GK, G3PP and GLYDH at 150 and 200mM NaCl were not significantly different. We hypothesise that mechanism(s) of glycerol retention/efflux in the cell are affected at 200mM NaCl in Arabidopsis.

Differential control of growth, apoptotic activity, and gene expression in human breast cancer cells by extracts derived from medicinal herbs Zingiber officinale.

The present study aimed to examine the antiproliferative potentiality of an extract derived from the medicinal plant ginger (Zingiber officinale) on growth of breast cancer cells. Ginger treatment suppressed the proliferation and colony formation in breast cancer cell lines, MCF-7 and MDA-MB-231. Meanwhile, it did not significantly affect viability of nontumorigenic normal mammary epithelial cell line (MCF-10A). Treatment of MCF-7 and MDA-MB-231 with ginger resulted in sequences of events marked by apoptosis, accompanied by loss of cell viability, chromatin condensation, DNA fragmentation, activation of caspase 3, and cleavage of poly(ADP-ribose) polymerase. At the molecular level, the apoptotic cell death mediated by ginger could be attributed in part to upregulation of Bax and downregulation of Bcl-2 proteins. Ginger treatment downregulated expression of prosurvival genes, such as NF-κB, Bcl-X, Mcl-1, and Survivin, and cell cycle-regulating proteins, including cyclin D1 and cyclin-dependent kinase-4 (CDK-4). On the other hand, it increased expression of CDK inhibitor, p21. It also inhibited the expression of the two prominent molecular targets of cancer, c-Myc and the human telomerase reverse transcriptase (hTERT). These findings suggested that the ginger may be a promising candidate for the treatment of breast carcinomas.

Morphological and morphometric study of cultured fibroblast from treated and untreated abnormal scar.

OBJECTIVE: To investigate the morphology of cultured fibroblasts derived from abnormal scars and compare it to those of human normal skin. METHODS: This study was carried out in the Surgical Clinic, Faculty of Medicine, King Abdul-Aziz University, Jeddah, Kingdom of Saudi Arabia between December 2008 and March 2010. Fifty-two samples of hypertrophic and keloid scar were collected. An in vitro study was conducted in which fibroblasts from normal foreskin; abnormal scars were cultured, studied morphologically and morphometrically. RESULTS: There was a highly significant increase in the length and breadth of fibroblasts from the hypertrophic and keloid scars, and highly significant decrease in the bipolarity index compared to control. There was a significant increase in the mean cell area, mean nuclear area and nuclear/cytoplasmic ratio of fibroblast of hypertrophic and keloid scars compared to control. There was a significant decrease in the mean cell area and mean nuclear area of the fibroblast of the treated keloid scar (with all used modalities) compared to untreated ones. Morphologically, abnormal scar fibroblasts has abundant spreading cytoplasm with numerous processes and large nuclei. The cytoplasm, of some cells, contained clumped granules in the peri-nuclear region, numerous vacuoles, and dense vesicles. CONCLUSION: Morphological and morphometric study showed that hyperactive cultured fibroblasts was a characteristic feature of abnormal scars and the studied modalities of treatment reduced, but not completely nullify this activity.