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Inhibitory Effect of Honeybee-Collected Pollen on Mast Cell Degranulation In Vivo and In Vitro
Yasuko Ishikawa,Tomoko Tokura,Nobuhiro Nakano,Mutsuko Hara,Fran?is Niyonsaba,Hiroko Ushio,Yuji Yamamoto,Tadahiro Tadokoro,Ko Okumura,Hideoki Ogawa 한국식품영양과학회 2008 Journal of medicinal food Vol.11 No.1
Bee-collected pollen (bee pollen [BP]) has been used as a folk medicine for centuries against various diseases,including allergy. There is no study elucidating how BP exerts such an anti-allergic effect. Since mast cells play a central rolein the pathogenesis of various allergic diseases, we investigated the effect of BP on mast cell activation elicited by the Fc im-munoglobulin E (IgE) receptor (Fc.RI)-mediated pathways. The in vivo effect of orally administered BP on cutaneous mastcell activation was examined by passive cutaneous anaphylaxis reaction. In vitromast cell degranulation and IgE binding tomast cells and the status of protein tyrosine phosphorylation were examined using bone marrow-derived mast cells. Daily oraladministration of BP to mice significantly reduced the cutaneous mast cell activation elicited by IgE and specific antigens.BP also reduced in vitromast cell degranulation and tumor necrosis factor-. production by inhibiting IgE binding to Fc.RIon mast cells. The inhibitory effect of BP on mast cell degranulation by preventing IgE binding was confirmed by the re-duced levels of protein tyrosine phosphorylation, which occurred as downstream events in activated mast cells via Fc.RI.These results first revealed that the anti-allergic action of BP was exerted by inhibiting the Fc.RI-mediated activation of mastcells, which plays important roles, not only in the early phase, but also in the late phase of allergic reactions.
사지말초부의 노출과 보온이 인체의 체온조절에 미치는 영향
정운선,登倉尋實 한국의류학회 1991 한국의류학회지 Vol.15 No.4
Effects of insulation after exposure of the extremities on the temperature regulation in clothed men were studied. Experiment was carried out with six males in a climatic chamber fixed at 10℃, 55% R.H. treated with Type A (face only was exposed) and Type B (face and half of the extremities were exposed). Mean skin temperature fell greater in Type B due to intense vasoconstriction than in Type A. Rectal temperature rose a little in Type B and resumed in Type A without any significant differences in metabolism between two types of clothing. These findings suggest that Type B is more effective in physiological defense to the cold stimuli than Type A at least at 10℃.
Effects of Fabric Surface Energy on Human Thermophysiological Responses during Exercise and Recovery
Zhou, L.Y.,Li, Y.,Chung, J.,Tokura, H.,Gohel, M.D.I.,Kwok, Y.L.,Feng, X.W. The Korean Fiber Society 2007 Fibers and polymers Vol.8 No.3
The present paper reports a study on influences of fabric surface energy of cotton and polyester garments on clothing microclimates and human thermophysiological responses during intermittent exercise and recovery. Eight healthy males wearing the garments prepared performed exercises and rest according to the following protocol: rest for 30 min, run on treadmill for total 60 min of three sessions with different intensity and duration, and then sit quietly for 30 min for recovery, all at $30^{\circ}C$ and relative humidity of 30 %, while the microclimate humidity ($H_{mc}$) and temperature ($T_{mc}$), the clothing outside surface humidity ($H_{co}$) and temperature ($T_{co}$), the skin temperatures and ear canal temperature ($T_{ear_canal})$ were measured. The garments are made of: (a) hydrophilic and hydrophobic cotton knitted fabrics, and (b) hydrophilic and hydrophobic polyester knitted fabrics. During and after exercise, for cotton, hydrophilic garment resulted in significant lower ${\Delta}H_{mc}$, ${\Delta}H_{co}$, ${\Delta}T_{mc}$, during recovery, higher ${\Delta}{\bar{T}}_{sk}$, lower ${\Delta}T_{ear_canal}$ and ${\Delta}T_{forehead}$. For polyester, hydrophilic garment resulted in significantly lower ${\Delta}H_{co}$, ${\Delta}T_{co}$, higher ${\Delta}T_{forehead}$, during E1, E2 and recovery session but lower during E3. In summary, surface energy of cotton garments had significant influences on human thermophysiological responses during exercise and recovery, and hydrophilic cotton garment was better than hydrophobic one to reduce heat stress. Surface energy of polyester garments had influences of lower significance, and hydrophilic garment appeared better than hydrophobic garment.