科學家最近表示,一種在保健食品商店常見的用於治療過敏以及減肥的草本提取物能有效治療膀胱感染。
大約90%的膀胱感染是由大腸桿菌引起的,其中婦女感染的機率是男性的4倍,而且常重複感染。膀胱由很多小袋構成,這使得其在充滿時可以伸展。Duke大學的科學家在4月8日的《自然-醫學》(Nature Medicine)上報導了一些細菌會躲藏在這些小袋中,從而躲過抗生素的治療。
研究主要負責人,微生物學家Soman N. Abraham說,這種在薄荷科植物中發現的提取物forskolin在老鼠實驗中被證明能將細菌趕出小袋,使抗生素殺死它們。在實驗中,forskolin被注射到小鼠體內或是直接注入膀胱。它們在保健品商店中非常常見,但這並不意味著人們可以隨便嘗試自己治療膀胱感染。
尿路感染必須得到及時治療,因為它會很快蔓延到腎臟。Abraham表示,下一步他們的工作是進行更大型的動物實驗以觀察這種提取物是否能徹底的去除膀胱感染。印度薄荷科植物提取物在古代亞洲就被用於多種疾病的治療,其中包括尿路感染。
來自Wisconsin大學醫學和公共健康學院的泌尿學學者Walter Hopkins認為,這一結果表明forskolin或許能提供一種防止再次感染的手段,從而找到儘快治療這種疾病的方法。他說:「如果這些研究結果能在人類身上得到證實,那麼forskolin無疑是一種全新的治療方案。」而倫敦Lawson健康研究中心的Gregor Reid博士也認為這一研究非常有趣。
原始出處:http://www.physorg.com/news95262922.html
Nature Medicine, Published online: 8 April 2007; | doi:10.1038/nm1572 Cyclic AMP–regulated exocytosis of Escherichia coli from infected bladder epithelial cells Brian L Bishop1, Mathew J Duncan1, Jeongmin Song1, Guojie Li2, David Zaas3 & Soman N Abraham1, 2, 4 1 Department of Molecular Genetics and Microbiology, Duke University Medical Center, Durham, North Carolina 27710, USA. 2 Department of Pathology, Duke University Medical Center, Durham, North Carolina 27710, USA. 3 Division of Pulmonary, Allergy and Critical Care Medicine, Department of Medicine, Duke University Medical Center, Durham, North Carolina 27710, USA. 4 Department of Immunology, Duke University Medical Center, Durham, North Carolina 27710, USA. Correspondence should be addressed to Brian L Bishop blb7@duke.edu or Soman N Abraham soman.abraham@duke.edu Abstract
部分英文原文:
The superficial bladder epithelium is a powerful barrier to urine and also serves as a regulator of bladder volume, which is achieved by apical exocytosis of specialized fusiform vesicles during distension of the bladder. We report that type 1 fimbriated uropathogenic Escherichia coli (UPEC) circumvents the bladder barrier by harboring in these Rab27b/CD63-positive and cAMP-regulatable fusiform vesicles within bladder epithelial cells (BECs). Incorporation of UPEC into BEC fusiform compartments enabled bacteria to escape elimination during voiding and to re-emerge in the urine as the bladder distended. Notably, treatment of UPEC-infected mice with a drug that increases intracellular cAMP and induces exocytosis of fusiform vesicles reduced the number of intracellular E. coli.
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新研究有希望幫助間質性膀胱炎患者
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