艱難梭菌是引發(fā)全球大部分抗生素相關(guān)腹瀉爆發(fā)的罪魁禍?zhǔn)祝?,一?xiàng)刊登在國際雜志PLoS Pathogens上的一篇研究報(bào)告中,來自倫敦衛(wèi)生與熱帶醫(yī)學(xué)院的科學(xué)家們通過研究發(fā)現(xiàn),艱難梭菌能夠產(chǎn)生一種名為對甲酚(p-cresol)的特殊化合物,這種化合物能夠幫助艱難梭菌在患者腸道中獲取一種競爭性的優(yōu)勢,而這無形中就影響了患者機(jī)體腸道中的自然保護(hù)菌群的功能。
抗生素的使用會(huì)干擾機(jī)體中天然保護(hù)的腸道菌群,從而讓患者對艱難梭菌感染變得易感,進(jìn)而引發(fā)潛在的致死性疾病和并發(fā)癥出現(xiàn);目前研究人員迫切需要通過研究來理解艱難梭菌如何影響腸道菌群并且干擾腸道的自我平衡,但其中一個(gè)問題是,艱難梭菌是腸道中已知的18種能夠產(chǎn)生對甲酚化合物的腸道菌群中的一種,對甲酚會(huì)抑制腸道中大范圍微生物菌群的生長,但其僅會(huì)在高濃度狀況下影響艱難梭菌。
這項(xiàng)研究中,研究人員通過研究首次發(fā)現(xiàn),艱難梭菌所產(chǎn)生的對甲酚會(huì)介導(dǎo)抵御其它腸道菌群的一種適應(yīng)性優(yōu)勢,對小鼠進(jìn)行研究結(jié)果表明,對甲酚能夠選擇性地靶向腸道中的特殊菌群,并且干擾其生長,最終導(dǎo)致腸道菌群的明顯改變。此外,并不會(huì)產(chǎn)生對甲酚的艱難梭菌突變體在最初感染后或許其在腸道中的定植能力會(huì)發(fā)生下降,本文研究結(jié)果表明,對甲酚的產(chǎn)生會(huì)促進(jìn)艱難梭菌的生存及其病理學(xué)表現(xiàn)。
最后研究者Lisa Dawson表示,如今我們發(fā)現(xiàn),主要的腸道病原體艱難梭菌會(huì)產(chǎn)生一種名為對甲酚的抑菌劑,其能夠幫助控制腸道菌群的功能,并在患者使用抗生素后為艱難梭菌提供在腸道中定植的優(yōu)勢,這種獨(dú)特的病原體特性或?yàn)楹笃诳茖W(xué)家們開發(fā)治療艱難梭菌感染的新型療法提供新的思路和希望。
原始出處:
How bad bacteria gain an edge in the gut
PLOS Pathogens http://dx.doi.org/10.1371/journal.ppat.1007191
The bacterium Clostridium difficile, which is responsible for the majority of antibiotic-associated diarrhea outbreaks worldwide, produces a unique compound called p-cresol to gain a competitive advantage over natural protective gut bacteria. The findings were reported by Lisa Dawson and Team at the London School of Hygiene and Tropical Medicine and colleagues on September 11 in the open-access journal PLOS Pathogens.
Antibiotics disrupt the natural protective gut flora, rendering people susceptible to C. difficile infection, which leads to potentially life-threatening disease and complications. Currently, there is a great need to better understand how C. difficile is able to influence the gut microbiota and disrupt intestinal homeostasis. One clue to this question is that C. difficile is one of only 18 intestinal commensal species known to produce p-cresol, which inhibits the growth of a broad range of microorganisms but only affects C. difficile at relatively high concentrations.
原標(biāo)題:PLoS Pathog:艱難梭菌如何憑借其所產(chǎn)生的特殊化合物在腸道中橫行霸道?
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