Browsing by Author "Rahiman, Farzana"
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Item Corrigendum: Immunological changes during space travel: A ground-based evaluation of the impact of neutron dose rate on plasma cytokine levels in human whole blood cultures(Frontiers Media, 2021) Fisher, Randall; Baselet, Bjorn; Rahiman, FarzanaA better understanding of the combined impact of different space stressors on human health is urgently warranted, considering the upcoming long-duration missions beyond lower Earth orbit. Therefore, a growing number of particle accelerator facilities implement ground-based set-ups to study the effect of simulated space radiation with simulated psychological or physical stressors. The immune system is highly sensitive to these types of stressors and limited information is currently available on the impact of the complex space radiation environment on the astronauts’ immune function. This pilot study presents a first step in the implementation of a ground-based set-up with neutron irradiation, which is considered to be an important secondary component in space radiation fields. The effect of dose rate on immune alterations was studied using the in vitro cytokine release assay. Whole blood samples (n = 8) were exposed to 0.125 or 1 Gy of neutron irradiation (fluence-weighted average energy: 29.8 MeV) at a lower dose rate (LDR) of 0.015 Gy/min and a higher dose rate (HDR) of 0.400 Gy/min. Immediately post-irradiation, blood samples were stimulated with lipopolysaccharide (LPS), heat-killed Listeria monocytogenes (HKLM) or lectin pokeweed mitogen (PWM), and incubated for 24 h.Item The in vitro effects of artificial and natural sweeteners on the immune system using whole blood culture assays(Taylor & Francis, 2013) Rahiman, Farzana; Pool, Edmund JohnThis article investigates the effects of commercially available artificial (aspartame, saccharin, sucralose) and natural sweeteners (brown sugar, white sugar, molasses) on the immune system. Human whole blood cultures were incubated with various sweeteners and stimulated in vitro with either phytohemagglutinin or endotoxin. Harvested supernatants were screened for cytotoxicity and cytokine release. Results showed that none of the artificial or natural sweeteners proved to be cytotoxic, indicating that no cell death was induced in vitro. The natural sweetener, sugar cane molasses (10 ug=mL), enhanced levels of the inflammatory biomarker IL-6 while all artificial sweeteners (10 ug=mL) revealed a suppressive effect on IL-6 secretion (P<0.001). Exposure of blood cells to sucralose-containing sweeteners under stimulatory conditions reduced levels of the biomarker of humoral immunity, Interleukin-10 (P<0.001). The cumulative suppression of Interleukin-6 and Interleukin-10 levels induced by sucralose may contribute to the inability in mounting an effective humoral response when posed with an exogenous threat.Item Preliminary study on the effect of sugar cane (Saccharum officinarum) molasses on steroidogenesis in testicular cell cultures(Academic Journals, 2010) Rahiman, Farzana; Pool, Edmund JohnBlackstrap molasses has been used for centuries in the preparation of food products and have also been used to treat numerous ailments such as high blood pressure, arthritis, ulcers, dermatitits, eczema, constipation, colitis, varicose veins and many other health problems. Reports suggest that blackstrap molasses may have endocrine disruptive effects in cattle. The present study investigated the effect of sugar cane (Saccharum officinarium) molasses on steroidogenesis in testis cell culture. Testis cell cultures were incubated with various concentrations of molasses. Luteinizing hormone was used to stimulate the production of testosterone in the testes cell culture. Supernatants of the testes cell cultures were then assayed for testosterone, oestradiol and cytotoxicity using commercially available kits. Results showed that low concentrations (12 - 50 ug/ml) of molasses increase testosterone secretion relative to control cultures (P < 0.05). None of the molasses concentrations tested were cytotoxic. This study has shown that molasses stimulate testosterone production. Therefore, molasses may potentially be used as a diet supplement to increase testosterone levels.