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731.
RC Skarnes SK Brown SS Hull JA McCracken 《The Journal of experimental medicine》1981,154(4):1212-1224
Biphasic fevers were induced in sheep with intravascular infusions or injections of 4-10 μg (80-200 ng/kg) of endotoxin, whereas monophasic fevers were obtained with doses of 1-2/μg (20-40 ng/kg). A marked increase in arterial blood pressure invariably accompanied the onset of fever; the latency of responses to the higher and lower doses of endotoxins averaged 26 min and 42 min, respectively. Prostaglandin (PG) assays of plasma from the carotid artery and jugular vein during fever episodes revealed a surge of PGE and PGF coincident with the pressor response and the first phase of fever, but PG were not detected in plasma samples taken throughout the second phase of fever. PG measurements of arterial and venous plasma collected at a distal site (hind limb) showed a similar surge of PGE and PGF in association with the early fever response, indicating that intravascular PG synthesis and release represents a generalized systemic response to circulating endotoxin. Carotid arterial infusions of PGE(2) produced immediate monophasic fevers and pressor responses, whereas PGD(2) infusions produced an immediate pressor effect but no fever. Infusions of PGF(2α) or prostacyclin, however, evoked neither fever nor pressor effects. Intracarotid infusions of leukocyte pyrogen (LP) caused monophasic fevers with latent periods of 15-20 min but pressor responses were not seen and neither PGE nor PGF were detected in plasma samples from the carotid artery or jugular vein before or during fever. Indomethacin, a potent inhibitor of arachidonic acid metabolism, blocked fever responses to endotoxin and to LP. These findings implicate PGE as the mediator of the early phase of endotoxin fever and imply a role for another pyrogenic metabolite ofarachidonic acid in the mediation of the second phase of fever, i.e., the phase associated with circulating LP. It is possible that both pyrogenic metabolites are generated within the vascular compartment, reaching thermoregulatory centers of the brain by transfer across the blood-brain interface. 相似文献
732.
International Journal of Diabetes in Developing Countries - 相似文献
733.
734.
Suppression of mouse skin tumor promotion and induction of apoptosis in HL-60 cells by Alpinia oxyphylla Miquel (Zingiberaceae) 总被引:3,自引:0,他引:3
There have been considerable efforts to search for naturally occurring
substances for the intervention of carcinogenesis. Many components from
dietary or medicinal plants have been identified that possess substantial
chemopreventive properties. An example is curcumin (Curcuma longa Linn.,
Zingiberaceae), which has been shown to inhibit tumor promotion in
experimental carcinogenesis. Alpinia oxyphylla Miquel, another plant of the
ginger family used in oriental herbal medicine, contains diarylheptanoids
whose structures are analogous to that of curcumin. In the present study,
we have tested A.oxyphylla for its ability to suppress tumor promotion.
Thus, topical application of the methanolic extract of dried fruits of
A.oxyphylla significantly ameliorated 12-O-tetradecanoylphorbol-13-acetate
(TPA)-induced skin tumor promotion as well as ear edema in female ICR mice.
In another study, treatment of HL-60 cells with the methanolic extract of
A.oxyphylla significantly reduced the viability of the cells and also
inhibited DNA synthesis. Microscopic examination of the treated cells
showed characteristic morphology of apoptosis. Furthermore, cells treated
with the extract of A.oxyphylla exhibited internucleosomal DNA
fragmentation in time- and concentration-dependent manners. TPA- stimulated
generation of superoxide anion in differentiated HL-60 cells was also
blunted by A.oxyphylla. Taken together, these findings suggest that
A.oxyphylla possesses potential chemopreventive and antitumorigenic
activities.
相似文献
735.
对陈香露白露片检验中有关问题的探讨 总被引:2,自引:0,他引:2
刘珊珊 《中国现代应用药学》1999,16(5):46-47
目的:探讨部颁标准陈香露片检验中存在的问题。方法:E和部颁标准和改进方法对陈香露片中的铋盐进行定性一定量、镁盐进行定性。结果:该片中的铋盐磺四鉴别反应。用稀硝酸代替盐酸做溶剂,呈正反应、镁盐氯化铵=磷酸氢二钠鉴别反应,加氨试液后,析出的白色沉淀不足Mg(OH)2,而是Bi(OH)3,该深沉在氯化铵试液中不溶,干扰镁盐鉴别;铋盐含量测定项,用加抗坏血酸掩蔽剂的方法,排除了Fe^3+的干扰,使终点颜色 相似文献
736.