Merchants without Borders: Qusman Traders in the Arabian Gulf and Indian Ocean, c. 1850-1950

This dissertation is a history of the economic, social, and political life in Arabia, the Arabian Gulf, and the Indian Subcontinent from the mid-nineteenth to the mid-twentieth centuries. It draws on materials from al-Qasim, Kuwait, Bahrain, Karachi, Bombay, Calcutta, and London, in addition to travelers’ accounts. These materials and accounts are used to explore the extent and significance of al-Qasim’s international trade between Arabia and India through the Arabian Gulf. It further examines how Qasimi merchants mobilized commodities and traded in the port cities of the Arabian Gulf and the Indian Ocean, taking advantage of changing regional and global political trends to create vast commercial enterprises that dominated regional trade. Hence, the dissertation traces the economic, political, social, and cultural effects of Qusman’s commercial travels both in their home country and trading centers where they resided. It argues that because of these travels, al-Qasim became the wealthiest district in Najd. Politically, the dissertation argues that these Qusman played a crucial economic role during the formation of the Kingdom of Saudi Arabia. Also, the connection of Qasimi traders to the outside world made al-Qasim different socially and culturally from the rest of Najd and more connected than other areas to global economics and cultures

Home Use of Mini-Dose Glucagon As a Novel Treatment for Hypoglycemia Following Repeated, Prolonged Fasts in Type 1 Diabetes During Ramadan

OBJECTIVE: We determined the efficacy of self-administered subcutaneous mini-dose glucagon (MDG) to treat fasting-induced hypoglycemia in type 1 diabetes (T1D). RESEARCH DESIGN AND METHODS: This was a 4-week randomized, controlled crossover trial of 2-week MDG or 2-week oral glucose tablets (OG, control) involving 17 adults with T1D during Ramadan. RESULTS: Compared with OG, MDG demonstrated a significant higher change in blood glucose from baseline to 30 min (Δ(t)(30), P < 0.001) and 1 h (Δ(t)(60), P = 0.02). The efficacy of MDG was preserved following ≥8 h fasting with significantly higher Δ(t)(30) in MDG (P = 0.01). Over the entire 2 weeks, MDG period had increased time in 70–180 mg/dL (P = 0.009) and less time <70 mg/dL (P = 0.04). MDG use resulted in higher completion of fasts compared with OG (P < 0.001). CONCLUSIONS: MDG administration is an effective alternative to OG for prevention and treatment of fasting-induced hypoglycemia, offering improved glycemic control and promoting successful completion of prolonged fasts

Sera from young and older humans equally sustain proliferation and differentiation of human myoblasts

International audienceUsing a human primary muscle cell culture model the behavior of myoblasts (satellite cells) cultured in human serum obtained from either young or elderly individuals was studied. Serum was obtained from a total of 13 young (7 male and 6 females aged, 23-36 years) and 9 elderly (4 male and 5 females aged 69-84 years) subjects and used in a number of experiments. Myoblasts were extracted from human muscle biopsy samples taken from the vastus lateralis. In the first experiment myoblasts were isolated immediately after extraction from the biopsy in media containing human sera to examine its effects on the onset and progression of Ki67 and desmin expression. No effect of the age of the serum was observed at 3, 5 or 7 days of proliferation. In addition, cells that had been expanded initially in optimum myoblast growth medium (GM, containing foetal calf serum and additional growth factors) prior to culture in medium containing 15% human serum were studied. The proportion of proliferating muscle cells co expressing desmin and Ki67 antigens after 46 hours was again similar in the young and old serum conditions. Culturing these myoblasts in media containing 2% human serum to study their fusion and differentiation also resulted in no difference between young and old serum conditions in terms of the percentage of nuclei inside myosin heavy chain positive myotubes. Despite the variability of different samples of myoblasts, the age of the serum has no affect on the expression of any measured index

Smart Injectable Chitosan Hydrogels Loaded with 5-Fluorouracil for the Treatment of Breast Cancer

The treatment of breast cancer requires long chemotherapy management, which is accompanied by severe side effects. Localized delivery of anticancer drugs helps to increase the drug concentration at the site of action and overcome such a problem. In the present study, chitosan hydrogel was prepared for local delivery of 5-Fluorouracil. The in vitro release behavior was investigated and the anticancer activity was evaluated against MCF-7 cells using MTT assay. The in vivo studies were investigated via intra-tumoral injection of a 5-FU loaded hydrogel into breast cancer of female rats. The results indicated that the modified hydrogel has excellent physicochemical properties with a sustained in vitro release profile matching a zero-order kinetic for one month. In addition, the hydrogel showed superior inhibition of cell viability compared with the untreated control group. Moreover, the in vivo studies resulted in antitumor activity with minor side effects. The tumor volume and level of tumor markers in blood were inhibited significantly by applying the hydrogel compared with the untreated control group. In conclusion, the designed injectable hydrogels are potential drug delivery systems for the treatment of breast cancer with a controlled drug release profile, which could be suitable for decreasing the side effects of chemotherapy agents

Thymoquinone, but Not Metformin, Protects against Gentamicin-Induced Nephrotoxicity and Renal Dysfunction in Rats

Background: Gentamicin (GM) is an antibiotic that is widely used to treat many Gram-negative bacteria, such as those involved in urinary tract infections. However, being nephrotoxic, GM dose adjustment and reno-protective elements must be concurrently administered with GM to minimize kidney damage. Oxidative stress plays a pivotal role in the pathogenesis of GM-induced nephrotoxicity. Thymoquinone (TQ) is a promising therapeutic substance, that is being extensively studied in many diseases, such as diabetes mellitus, cancer, hypertension, and others. The powerful antioxidant properties of TQ may greatly help in minimizing GM nephrotoxicity. Metformin (MF) is a well-known, clinically approved oral hypoglycaemic drug that has many other actions, including antioxidant properties. The aim of this work was to evaluate the possible antioxidant and reno-protective effects of TQ and metformin in GM-induced nephrotoxicity in the same model (rats) at the same time. In addition, we aimed to further understand the effects underlying GM-induced nephrotoxicity. Methods: Twenty male rats were randomly divided into four equal groups: the first group (control) received distilled water; the second group received GM only; the third group received concurrent oral TQ and GM; and the fourth group received concurrent oral MF and GM. After 4 weeks, renal function and histopathology, as well as levels of the oxidative markers glutathione peroxidase-1 (GLPX1), superoxide dismutase (SOD), and malondialdehyde (MDA) in the kidney tissues, were assessed. Results: Compared with the control group, and as expected, the GM-injected rats showed significant biochemical and histological changes denoting renal damage. Compared with GM-injected rats, the concurrent administration of TQ with GM significantly reduced the levels of serum creatinine, serum urea, and tissue MDA and significantly increased the levels of GLPX1 and SOD. Concurrent metformin administration with GM significantly increased the levels of both GLPX1 and SOD and significantly decreased the levels of tissue MDA but had no significant effect on serum creatinine and urea levels. Compared with GM-injected rats, the addition of either TQ or MF resulted in a reduction in endothelial proliferation and mesangial hypercellularity. Conclusions: Both TQ and MF effectively alleviated the oxidative stress in GM-induced nephrotoxicity in rats, with TQ but not MF producing a complete reno-protective effect. Further studies for evaluation of different reno-protective mechanisms of TQ should be conducted

Silver citrate nanoparticles inhibit PMA-induced TNF alpha expression via deactivation of NF-kappa B activity in human cancer cell-lines, MCF-7

Background: The nuclear factor kappa-B (NF-κB) is a major transcription factor responsible for the production of numerous inflammatory mediators, including the tumor necrosis factor (TNFα), which has a lethal association with cancer’s onset. The silver nanoparticles (AgNPs) are widely used in cancer treatment and several other biomedical applications. Objective: The study aimed to determine the effects of silver citrate nanoparticles (AgNPs-CIT) on NF-κB activation together with TNFα mRNA/protein expressions in the phorbol myristate acetate (PMA)-stimulated MCF-7 human breast cancer cell-lines. Methods: The AgNPs-CIT were synthesized by the reduction method, and the prepared AgNPs-CIT were characterized for their shape, absorption in UV-VIS electromagnetic radiations, size distribution, ζ-potential, and antioxidant activity. The MCF-7 cell-lines were pretreated with AgNPs-CIT and stimulated with PMA. The TNFα mRNA expressions were determined by real-time PCR, whereas the protein production was determined by the ELISA. The NF-κB activity was distinctly observed by highly-specific DNA-based ELISA, and by NF-κB-specific inhibitor, Bay 11– 7082. Results: The prepared AgNPs-CIT were spherical and have an absorption wavelength range of 381– 452 nm wherein the particles size ranged between 19.2± 0.1 to 220.77± 0.12 nm with the charge range − 9.99± 0.8 to − 34.63± 0.1 mV. The prepared AgNPs-CIT showed comparative antioxidant activity at > 40% inhibitions level of the DPPH radicals. The AgNPs-CIT were found to be non-toxic to MCF-7 cell-lines and inhibited PMA-induced activation of the NF-κBp65, and also the mRNA/protein expression of TNFα. Conclusion: This is the first report that showed AgNPs-CIT inhibited TNFα expression via deactivation of the NF-κB signaling event in stimulated breast cancer cells. The results have important implications for the development of novel therapeutic strategies for the prevention/treatment of cancers and/or inflammatory disorders

Retardation of Bacterial Biofilm Formation by Coating Urinary Catheters with Metal Nanoparticle-Stabilized Polymers

Urinary catheter infections remain an issue for many patients and can complicate their health status, especially for individuals who require long-term catheterization. Catheters can be colonized by biofilm-forming bacteria resistant to the administered antibiotics. Therefore, this study aimed to investigate the efficacy of silver nanoparticles (AgNPs) stabilized with different polymeric materials generated via a one-step simple coating technique for their ability to inhibit biofilm formation on urinary catheters. AgNPs were prepared and characterized to confirm their formation and determine their size, charge, morphology, and physical stability. Screening of the antimicrobial activity of nanoparticle formulations and determining minimal inhibitory concentration (MIC) and their cytotoxicity against PC3 cells were performed. Moreover, the antibiofilm activity and efficacy of the AgNPs coated on the urinary catheters under static and flowing conditions were examined against a clinical isolate of Escherichia coli. The results showed that the investigated polymers could form physically stable AgNPs, especially those prepared using polyvinyl pyrrolidone (PVP) and ethyl cellulose (EC). Preliminary screening and MIC determinations suggested that the AgNPs-EC and AgNPs-PVP had superior antibacterial effects against E. coli. AgNPs-EC and AgNPs-PVP inhibited biofilm formation to 58.2% and 50.8% compared with AgNPs-PEG, silver nitrate solution and control samples. In addition, coating urinary catheters with AgNPs-EC and AgNPs-PVP at concentrations lower than the determined IC50 values significantly (p t-test) inhibited bacterial biofilm formation compared with noncoated catheters under both static and static and flowing conditions using two different types of commercial Foley urinary catheters. The data obtained in this study provide evidence that AgNP-coated EC and PVP could be useful as potential antibacterial and antibiofilm catheter coating agents to prevent the development of urinary tract infections caused by E. coli