Background and aims: Conflicting results exist about the presence of Mycobacterium avium subspecies paratuberculosis (MAP) specific IS900 DNA in Crohn’s disease (CD) tissues. Therefore, we examined IS900 in a large n...Background and aims: Conflicting results exist about the presence of Mycobacterium avium subspecies paratuberculosis (MAP) specific IS900 DNA in Crohn’s disease (CD) tissues. Therefore, we examined IS900 in a large number of gut samples from patients with CD (n = 100) and ulcerative colitis (UC, n = 100), and in non-inflamed control tissues (nIBD, n = 100). We hypothesised that IS900 DNA detection might be associated with distinct clinical phenotypic characteristics in CD. Methods: The prevalence of MAP DNA in surgically resected tissues was examined using a mechanical-enzymatic disruption technique and nested IS900 specific polymerase chain reaction (PCR). CD patients were stratified according to the criteria of the Vienna classification and other clinical characteristics. Results: IS900 PCR detection rate was significantly higher in CD tissue samples (52%) than in UC (2%) or nIBD (5%) specimens (p < 0.0001 ). In CD patients, IS900 DNA was detected in samples from both diseased small bowel (47%) as well as from the colon (61%). No firm association between MAP specific IS900 detection rates and clinical phenotypic characteristics in CD could be established. However, corticosteroid medication constituted a factor which tended to have a negative influence on IS900 DNA detection rates in CD(p < 0.01). Conclusions: The presence of MAP specific IS900 DNA is a predominant feature of CD. Therapeutic intervention against MAP might represent a potential target for disease mitigation in Crohn’s disease.展开更多
幽门螺杆菌（Hp ）是定植在人类胃黏膜的有较强传染性的一种革兰阴性菌［1］。慢性 Hp 感染在慢性胃炎、消化性溃疡、胃腺癌及胃黏膜相关淋巴组织（MALT）淋巴瘤的致病机制中起着非常重要的作用［2，3］。炎症性肠病（IBD）包括克罗恩病...幽门螺杆菌（Hp ）是定植在人类胃黏膜的有较强传染性的一种革兰阴性菌［1］。慢性 Hp 感染在慢性胃炎、消化性溃疡、胃腺癌及胃黏膜相关淋巴组织（MALT）淋巴瘤的致病机制中起着非常重要的作用［2，3］。炎症性肠病（IBD）包括克罗恩病（CD）和溃疡性结肠炎（UC），其发病机制尚不明确，研究者猜测螺杆菌属可能会出现在人类结肠并参与 IBD发生［4］。在一些 CD 患者的粪便或黏膜标本中发现了条件致病菌，如类结核分枝杆菌、侵袭性大肠杆菌和梭状芽孢杆菌等［5］。Pearce 等［6］的研究发现， CD 患者中 Hp 阳性者比正常对照组少。在 Man等［7］的研究中，59％的 CD 患儿被检出 Hp 阳性，远高于无症状健康儿童。以上均提示，Hp 感染可能在 CD 发病中起着重要的作用。展开更多
文摘Background and aims: Conflicting results exist about the presence of Mycobacterium avium subspecies paratuberculosis (MAP) specific IS900 DNA in Crohn’s disease (CD) tissues. Therefore, we examined IS900 in a large number of gut samples from patients with CD (n = 100) and ulcerative colitis (UC, n = 100), and in non-inflamed control tissues (nIBD, n = 100). We hypothesised that IS900 DNA detection might be associated with distinct clinical phenotypic characteristics in CD. Methods: The prevalence of MAP DNA in surgically resected tissues was examined using a mechanical-enzymatic disruption technique and nested IS900 specific polymerase chain reaction (PCR). CD patients were stratified according to the criteria of the Vienna classification and other clinical characteristics. Results: IS900 PCR detection rate was significantly higher in CD tissue samples (52%) than in UC (2%) or nIBD (5%) specimens (p < 0.0001 ). In CD patients, IS900 DNA was detected in samples from both diseased small bowel (47%) as well as from the colon (61%). No firm association between MAP specific IS900 detection rates and clinical phenotypic characteristics in CD could be established. However, corticosteroid medication constituted a factor which tended to have a negative influence on IS900 DNA detection rates in CD(p < 0.01). Conclusions: The presence of MAP specific IS900 DNA is a predominant feature of CD. Therapeutic intervention against MAP might represent a potential target for disease mitigation in Crohn’s disease.
文摘幽门螺杆菌（Hp ）是定植在人类胃黏膜的有较强传染性的一种革兰阴性菌［1］。慢性 Hp 感染在慢性胃炎、消化性溃疡、胃腺癌及胃黏膜相关淋巴组织（MALT）淋巴瘤的致病机制中起着非常重要的作用［2，3］。炎症性肠病（IBD）包括克罗恩病（CD）和溃疡性结肠炎（UC），其发病机制尚不明确，研究者猜测螺杆菌属可能会出现在人类结肠并参与 IBD发生［4］。在一些 CD 患者的粪便或黏膜标本中发现了条件致病菌，如类结核分枝杆菌、侵袭性大肠杆菌和梭状芽孢杆菌等［5］。Pearce 等［6］的研究发现， CD 患者中 Hp 阳性者比正常对照组少。在 Man等［7］的研究中，59％的 CD 患儿被检出 Hp 阳性，远高于无症状健康儿童。以上均提示，Hp 感染可能在 CD 发病中起着重要的作用。
