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1.
目的:探讨利用献血者捐献血液中的白细胞制备的异体细胞因子诱导的杀伤(CIK)细胞与肿瘤靶细胞体外杀伤试验情况。方法:重悬献血者CIK细胞与肝癌细胞、人乳腺癌细胞、白血病细胞、B淋巴瘤细胞浓度,以CIK细胞为效应细胞,肿瘤细胞为靶细胞,使效靶比为32∶1、16∶1、8∶1、4∶1、2∶1、1∶1时共培养48h后检测450nm下的吸收度A值。结果:献血者异体CIK细胞对肝癌、乳腺癌、白血病、B淋巴瘤细胞4种肿瘤靶细胞的杀伤率随着效应细胞数的增加而增大,当效靶比为32∶1时,献血者异体CIK细胞的杀伤率分别为86.1%、84.3%、62.5%、87.9%;献血者异体CIK细胞对肝癌、乳腺癌、B淋巴瘤细胞杀伤活性明显强于白血病细胞,同一效靶比时,CIK细胞对肝癌细胞杀伤活性较高,对白血病细胞杀伤活性较差。结论:献血者CIK细胞对肝癌、人乳腺癌、白血病、B淋巴瘤细胞等肿瘤细胞的生长均有明显的抑制作用。4种肿瘤靶细胞的杀伤率随着效应细胞数的增加而增大,同一效靶比时,CIK细胞对肝癌细胞杀伤活性较高,对白血病细胞杀伤活性较差。  相似文献   

2.
自体DC体外增强结肠腺癌患者TDLN细胞的抗肿瘤活性   总被引:1,自引:0,他引:1  
目的:探讨自体树突状细胞(DC)体外对结肠腺癌患者肿瘤引流区淋巴结(TDLN)细胞抗肿瘤活性的增强作用.方法:分离肿瘤患者的外周血单个核细胞 (PBMC)经IL-4,GM-CSF和TNF-α诱导其成熟,并以自体肿瘤冻融抗原预致敏,诱导其中的DC.另外,分离结肠癌患者的TDLN细胞, 在含有IL-2的培养体系中培养,并将TDLN 细胞分为3组:第1组为肿瘤抗原致敏的DC加 TDLN细胞(DC组);第2组冻融的肿瘤抗原加 TDLN细胞(Ag组);第3组不加DC及肿瘤抗原作为对照组(L组).比较3组TDLN细胞对结肠腺癌细胞系LS174T和黑色素瘤细胞系A375的杀伤作用.结果:DC组对LS174T细胞系的杀伤作用明显优于Ag组与L组(效靶比为20:1时,56.13%±7.33% vs 42.46%±7.68%,33.50%±7.00%, P<0.001:效靶比为10:1时,44.85%±6.50% vs 30.50%±9.17%,26.75%±8.88%,P<0.001); 而对A375细胞,各组细胞的杀伤作用没有明显差异.结论:自体DC可明显增强结肠癌患者TDLN 细胞的杀伤作用.  相似文献   

3.
目的:研究骨髓瘤独特型抗原(Idiotype,Id)负载树突细胞(DC)对同源细胞因子诱导的杀伤细胞(CIK)体外抗瘤活性的影响。方法:采集健康供者外周血单个核细胞(PBMNC)用常规方法诱导DC和CIK细胞,将骨髓瘤OPM-2细胞培养上清提取的Id冲击或未冲击的DC与CIK细胞共培养(CIK、DC加CIK、Id-DC加CIK),用流式细胞术分析细胞表型,MTT法检测体外效应细胞杀伤活性。结果:在(5~20):1效靶比范围内, CIK细胞对OPM-2和K562细胞的杀伤率分别为(24.47±3.00)%~(40.64±1.62)%和(23.36±1.51)%~(42.52±2.06)%。DC加CIK及Id—DC加CIK对OPM-2和K562细胞的杀伤活性均高于CIK组,差异有统计学意义(P<0.05);而在相同效靶比之下,Id-DC加CIK对OPM-2细胞的杀伤活性最强,差异有统计学意义(P <0.05)。结论:CIK细胞对骨髓瘤细胞有强的杀伤活性,经Id负载的DC与CIK细胞共培养能进一步增强其特异性杀伤活性,对骨髓瘤可能有免疫治疗作用。  相似文献   

4.
目的探讨负载P-糖蛋白(P-gp)高表达的多药耐药(MDR)白血病K562/A02细胞冻融抗原的树突状细胞(DC)与同源细胞因子诱导的杀伤细胞(CIK)共培养对MDRK562/A02杀伤作用的影响。方法提取健康人骨髓单个核细胞,常规诱导出DC及CIK,将K562/A02细胞冻融物作为抗原冲击的DC,与CIK共培养作为实验组,抗原不冲击的DC与CIK共培养作为对照组,以CIK及DC单独培养分别作为空白对照组1和空白对照组2。光镜下观察细胞形态,流式细胞术分析细胞表型,MTT法检测杀伤活性。结果实验组、对照组细胞增殖活性均大于CIK组(P<0.05)。实验组对K562/A02、K562的杀伤活性在效靶比5∶1、10∶1、20∶1时分别为(42.90±0.67)%、(49.85±0.28)%、(63.36±0.46)%和(23.56±0.43)%、(26.11±0.34)%、(34.46±0.35)%,均高于对照组及空白对照组1(P<0.05);实验组对K562/A02的杀伤活性高于K562和MCF7(P<0.05)。结论DC与CIK共培养物是一种增殖活性和细胞毒活性高于CIK的免疫活性细胞,而经冻融抗原冲击的DC与CIK共培养能明显提高对MDRK562/A02的杀伤活性。  相似文献   

5.
[目的]研究树突状细胞(DC)联合细胞因子诱导或未诱导的杀伤细胞(CIK)或淋巴因子激活的杀伤细胞(LAK)对结肠癌细胞株SW480的杀伤活性.提供DC联合CIK或LAK治疗结肠癌的实验依据.[方法]取人外周血分离出单个核细胞(PBMNC),诱导生成DC、CIK、LAK细胞;流式细胞仪检测DC经SW480肿瘤抗原冲击后的表型变化;以CIK+DC细胞、CIK细胞、LAK+DC细胞及LAK细胞作为效应细胞,SW480为靶细胞,以15∶1、30∶1、45∶1为效靶比,LDH释放法测定细胞杀伤试验活性;ELISA检测杀伤试验中干扰素γ(IFN-γ)、白细胞介素2(IL-2)、IL-12、IL-17的分泌水平.[结果]流式细胞仪检测DC经SW480肿瘤抗原冲击后,其表面分子HLA-DR、CD40、CD80和CD86表达分别平均为90.23%、73.68%、85.96%、57.55%,与未经肿瘤抗原冲击DC比较,DC成熟的表面标志分子表达明显增加(P<0.01).相同效靶比下,CIK+DC细胞组对SW480的杀伤作用最强,明显高于其他细胞组(P<0.01);CIK+ DC细胞组在效靶比为45∶1时,杀伤活性最强(P<0.01);单独CIK细胞组的杀伤活性明显高于LAK+DC细胞组(P<0.01);LAK+ DC细胞组的杀伤活性明显高于单独LAK细胞组(P<0.01).效靶比为45∶1时,各杀伤试验细胞组上清液中IFN-γ、IL-2、IL-12、IL-17的分泌量,CIK+DC细胞组的IFN-γ、IL-12的分泌量显著高于其他细胞组(P<0.05);LAK+DC、单独LAK细胞组IL-2的分泌量明显高于CIK+DC、单独CIK细胞组(P<0.05);单独CIK细胞组IFN-γ的分泌量明显高于LAK+DC、单独LAK细胞组(P<0.05).[结论]CIK+DC细胞组对SW480的杀伤活性明显强于单独CIK、LAK+ DC组、单独LAK细胞组.其机制可能是,SW480抗原致敏的DC分泌IFN-γ、IL-12等刺激、诱导CIK细胞的活化和增殖,明显增强CIK细胞杀伤SW480的活性.  相似文献   

6.
人末梢血γδT细胞对消化系统肿瘤细胞的杀伤作用   总被引:8,自引:2,他引:8  
目的:探讨人末梢血扩增的γδT细胞对常见的消化系统肿瘤细胞株的杀伤作用.方法:用含IPP和IL-2的RPMI 1640培养基扩增人外周血γδT细胞,用流式细胞术检测培养10d的γδT细胞的纯度.用扩增后的γδT细胞与人胃癌细胞株、胰腺癌细胞株和肝癌细胞株按不同效靶比例孵育后进行细胞毒活性测定.结果:人末梢血单个核细胞经过培养扩增10 d时γδT细胞迅速从4.21%扩增到70.35%.培养10 d时贴壁生长的γδT细胞对人胃癌细胞株、胰腺癌细胞株和肝癌细胞株均有较强的杀伤活性,在效靶比例为40:1时细胞毒活性分剐为61%、50%和59%,高于悬浮生长的γδT(分别为50%、37%和37%)和CIK(分别为45%、34%和40%)细胞毒活性.结论:人末梢血扩增的γδT细胞对消化系统常见的肿瘤细胞有较强的杀伤作用,贴壁生长的γδT细胞对肿瘤细胞的杀伤作用强于悬浮生长的γδT细胞和CIK细胞.γδT细胞将是肿瘤细胞免疫治疗中又一类重要的免疫效应细胞.  相似文献   

7.
人末梢血γδT细胞对消化系统肿瘤细胞的杀伤作用   总被引:8,自引:0,他引:8  
目的探讨人末梢血扩增的γδT细胞对常见的消化系统肿瘤细胞株的杀伤作用.方法用含IPP和IL-2的RPMI 1640培养基扩增人外周血γδT细胞,用流式细胞术检测培养10 d的γδT细胞的纯度.用扩增后的γδT细胞与人胃癌细胞株、胰腺癌细胞株和肝癌细胞株按不同效靶比例孵育后进行细胞毒活性测定.结果人末梢血单个核细胞经过培养扩增10 d时γδT细胞迅速从4.21%扩增到70.35%.培养10 d时贴壁生长的γδT细胞对人胃癌细胞株、胰腺癌细胞株和肝癌细胞株均有较强的杀伤活性,在效靶比例为40∶1时细胞毒活性分别为61%、50%和59%,高于悬浮生长的γδT(分别为50%、37%和37%)和CIK(分别为45%、34%和40%)细胞毒活性.结论人末梢血扩增的γδT细胞对消化系统常见的肿瘤细胞有较强的杀伤作用,贴壁生长的γδT细胞对肿瘤细胞的杀伤作用强于悬浮生长的γδT细胞和CIK细胞.γδT细胞将是肿瘤细胞免疫治疗中又一类重要的免疫效应细胞.  相似文献   

8.
新型免疫活性细胞CIK体外对肝癌细胞的杀伤   总被引:22,自引:10,他引:12  
目的 观察人体CIK(cytokine-induced killer)细胞的体外增殖力及杀伤肝癌细胞活性.方法 采取健康自愿者的成分血,用淋巴细胞分离液分离获得外周血单个核细胞(PBMC),在体外培养条件下,通过加入不同细胞因子(如IFN-γ,IL-1,IL-2,CD3 mAb)培养诱导成CIK细胞和LAK细胞,观察不同培养细胞的增殖能力;用流式细胞仪对培养细胞做细胞表型动态分析,观察培养细胞的表面标志;与LAK细胞作对比,用MTT法测定并比较不同效应细胞的体外抗肝癌细胞活性.结果 CIK细胞在培养14 d后开始大量增殖且在含人血清的培养基中增殖数量最多,可达500多倍.经表型分析表明,CIK细胞属于异质细胞群,在培养过程中,CD3+CD56+双阳性细胞的绝对数量获得了大量增殖,至56 d时可占细胞总数的51.26%,是CIK主要的效应细胞;实验表明,CIK细胞体外杀伤肝癌细胞的活性明显优于LAK细胞.结论 CIK细胞是一种具有较强杀伤肝癌细胞的免疫活性细胞,有可能应用于抗肿瘤的生物治疗.  相似文献   

9.
目的观察细胞因子诱导的杀伤细胞(C IK细胞)对结肠癌SW 620和LOVO细胞株的杀伤作用。方法无菌采集健康人和结肠癌患者外周血,诱导制备C IK细胞。采用流式细胞术检测两者细胞表型。将健康人、结肠癌患者来源的C IK细胞分别以20∶1、10∶1的效靶比作用于结肠癌SW 620、LOVO细胞株,测算杀伤活性。结果用健康人来源的C IK细胞处理SW 620细胞,效靶比为20∶1时的杀伤活性为80.86%±6.08%,10∶1时为78.00%±7.63%;处理LOVO细胞,效靶比为20∶1时的杀伤活性为86.13%±6.97%,10∶1时为82.15%±6.60%。用结肠癌患者来源的C IK细胞处理SW 620细胞,效靶比为20∶1时的杀伤活性为63.36%±5.26%,10∶1时为65.35%±6.28%;处理LOVO细胞,效靶比为20∶1时的杀伤活性为60.33%±4.09%,10∶1时为55.16%±5.82%。相同靶细胞和相同效靶比下健康人来源的C IK细胞的杀伤活性明显高于结肠癌来源的C IK细胞(P均〈0.05)。结论健康人、结肠癌患者来源的C IK细胞对结肠癌SW 620、LOVO细胞均有杀伤作用。健康人来源的C IK细胞对结肠癌SW 620、LOVO细胞株的杀伤作用更强。  相似文献   

10.
目的探讨同种异体NK细胞对CD3+4早期急性髓系白血病(AML)细胞的体外杀伤活性。方法免疫磁珠法分离5例健康个体NK细胞,以NK杀伤敏感细胞株K562作为对照,乳酸脱氢酶(LDH)释放法测定不同效靶比时NK细胞对CD3+4早期AML细胞KG1a的杀伤活性。结果AML细胞株KG1a中CD34抗原表达率为98.0%±1.1%,分选后的NK细胞纯度为93.2%±3.7%。不同效靶比时NK细胞对KG1a细胞均有杀伤活性,且随着效靶比的增高,其杀伤活性增高(P<0.05)。结论同种异体NK细胞对CD34+早期AML细胞具有一定的杀伤活性。  相似文献   

11.
目的胰岛素瘤是最常见的胰腺神经内分泌肿瘤,因其临床表现多样,导致诊断困难。影像学诊断尤其是超声内镜(EUS)在胰岛素瘤的诊断中起着重要作用,拥有较高的敏感性和特异性。本研究拟通过明确胰岛素瘤的解剖分布特点,以期有助于提高影像学的诊断准确率和降低漏诊率,尤其是在教育和培训实践中对于EUS的学习者更具有指导价值。 方法回顾性分析解放军总医院第一医学中心病案资料数据库1993年1月至2019年11月经外科手术、病理确诊为胰岛素瘤的患者的临床资料,检索方法采取搜索术后病理诊断为"胰岛素瘤"的病例,通过查阅病例的方法,提取出胰岛素瘤的大小和解剖分布等数据,进一步分析其特点。 结果共检索到确诊为胰岛素瘤的患者116例,其中,男45例、女71例,年龄13~76岁,平均年龄(44.4±14.85)岁。胰岛素瘤单发110例(94.8%)、多发6例(5.2%)。位置分布:头颈部46例(39.7%),单发45例、多发1例;体尾部68例(58.6%),单发65例、多发3例;全胰腺多发2例(1.7%)。病变大小特点:最大径0.4~3.4 cm,平均大小(1.53±0.58)cm。≤1 cm 29例、>1 cm而≤1.5 cm41例、>1.5 cm而≤2.0 cm28例,≤3 cm 15例,>3 cm 3例。年龄与肿瘤的大小相关,≤44岁患者肿瘤平均大小为(1.36±0.51)cm、>44岁患者肿瘤平均大小为(1.70±0.60)cm,P<0.05。头颈部的肿瘤大于体尾部的肿瘤,头颈部肿瘤平均大小(1.66±0.63)cm,体尾部(1.42±0.52)cm,P<0.05。 结论胰岛素瘤在胰腺体尾部较头颈部更好发;绝大多数单发,但可以全胰腺多发;多数小于1.5 cm,肿瘤的大小与患者年龄和肿瘤的解剖分布相关。  相似文献   

12.
Most adenomas and carcinomas of the small intestine and extrahepatic bile ducts arise in the region of the papilla of Vater. In familial adenomatous polyposis (FAP) it is the main location for carcinomas after proctocolectomy. In many cases symptoms due to stenosis lead to diagnosis at an early tumor stage. In about 80%, curative intended resection is possible. Operability is the most relevant prognostic factor. Most ampullary carcinomas resp. carcinomas of the papilla of Vater develop from adenomatous or flat dysplastic precursor lesions. They can be sited in the ampulloduodenal part of the papilla of Vater, which is lined by intestinal mucosa. They also can develop in deeper parts of the ampulla, which are lined by pancreaticobiliary duct mucosa. Intestinal-type adenocarcinoma and pancreaticobiliary-type adenocarcinoma represent the main histological types of ampullary carcinoma. Furthermore, there exist unusual types and undifferentiated carcinomas. Many carcinomas of intestinal type express the immunohistochemical marker profile of intestinal mucosa (keratin 7?, keratin 20+, MUC2+). Carcinomas of pancreaticobiliary type usually show the immunohistochemical profile of pancreaticobiliary duct mucosa (keratin 7+, keratin 20?, MUC2?). Even poorly differentiated carcinomas, as well as unusual histological types, may conserve the marker profile of the mucosa they developed from. These findings underline the concept of histogenetically different carcinomas of the papilla of Vater which develop either from intestinal- or from pancreaticobiliary-type mucosa of the papilla of Vater. Molecular alterations in ampullary carcinomas are similar to those of colorectal as well as pancreatic carcinomas, although they appear at different frequencies. In future studies, molecular alterations in ampullary carcinomas should be correlated closely with the different histologic tumor types. Consequently, the histologic classification should reflect the histogenesis of ampullary tumors from the two different types of papillary mucosa.  相似文献   

13.
Summary Palmitic acid oxidation in rat diaphragm homogenate is depressed by biguanide concentrations that are still incapable of inhibiting oxidative phosphorylation. Glucose oxidation is not directly effected by the same biguanide concentrations: however, the inhibitory effect of palmitic acid on glucose oxidation is partly removed by biguanides. Inhibition of fatty acid oxidation, which accounts for most of the metabolic effects caused by these drugs, can be regarded as the fundamental mechanism of action of biguanides. There is some evidence suggesting that these drugs might interact with carnitine, thus preventing long-chain fatty acids from being transported across the mitochondrial membrane to the site of oxidation. Traduzione a cura degli AA.  相似文献   

14.
BACKGROUND AND AIM: Both the clinical presentation and the degree of mucosal damage in coeliac disease vary greatly. In view of conflicting information as to whether the mode of presentation correlates with the degree of villous atrophy, we reviewed a large cohort of patients with coeliac disease. PATIENTS AND METHODS: We correlated mode of presentation (classical, diarrhoea predominant or atypical/silent) with histology of duodenal biopsies and examined their trends over time. RESULTS: The cohort consisted of 499 adults, mean age 44.1 years, 68% females. The majority had silent coeliac disease (56%) and total villous atrophy (65%). There was no correlation of mode of presentation with the degree of villous atrophy (p=0.25). Sixty-eight percent of females and 58% of males had a severe villous atrophy (p=0.052). There was a significant trend over time for a greater proportion of patients presenting as atypical/silent coeliac disease and having partial villous atrophy, though the majority still had total villous atrophy. CONCLUSIONS: Among our patients the degree of villous atrophy in duodenal biopsies did not correlate with the mode of presentation, indicating that factors other than the degree of villous atrophy must account for diarrhoea in coeliac disease.  相似文献   

15.
血吸虫童虫是宿主免疫系统攻击的重要靶标,包括皮肤型、肺型和肝门型童虫。宿主分子对童虫生长发育具有重要作用。童虫生长发育机制包括免疫调节、信号转导、性别发育及凋亡等。肌动蛋白、组织蛋白酶、烯醇化酶和葡萄糖基转移酶等分子为血吸虫童虫生长发育的重要分子。本文对血吸虫童虫生长发育及其机制的研究进展做一综述。  相似文献   

16.
目的对临床分离的耐多药结核分枝杆菌相关基因的突变特征进行分析。方法对124例耐多药结核分枝杆菌以及50株敏感株的耐药相关基因(包括异烟肼inh A、kat G、oxyR-ahp C间隔区以及利福平rpo B)进行序列测定,分析其基因突变情况。结果异烟肼耐药inh A基因突变率为14.5%;kat G基因突变率为70.2%(87/124),主要位于315位;oxyR-ahp C间隔区突变率为15.3%;inh A、kat G两种基因同时突变率75.0%,三种基因同时突变率为89.5%。利福平rpo B基因突变的检出率高达95.2%,突变主要发生在531、526、516位点。结论我省耐多药菌异烟肼耐药相关基因最常见突变为kat G 315、inh A C-T(-15)、axyR-ahp C间隔区(-10)C-T,利福平为rpo B531、526、516。结合MDR-TB耐药相关基因的特征分析,可以建立一种快速、准确、特异的适合于我省的检测结核菌耐多药性的新方法。  相似文献   

17.
氯硝柳胺悬浮剂的毒性评价   总被引:2,自引:2,他引:2  
目的评价氯硝柳胺悬浮剂的毒性,为现场大规模应用灭螺提供依据。方法按照中华人民共和国国家标准GB 15670-1995《农药登记毒理学试验方法》和鱼类毒性试验方法进行。结果经口、经皮肤的LDso雌、雄性大鼠均>5 000 mg/kg,经呼吸道的LCso雌、雄性大鼠均>5 000mg/m3,该药经口、经皮肤、经呼吸道毒性均属微毒类药物;兔眼用药后,观察期内无不良反应,对眼无刺激性;皮肤用药后对皮肤无刺激性。与氯硝柳胺原药、氯硝柳胺乙醇胺盐原药和氯硝柳胺乙醇胺盐可湿性粉剂相比,氯硝柳胺悬浮剂对鱼急性毒性最低。结论氯硝柳胺悬浮剂属微毒类药物,对鱼的毒性低于其乙醇胺盐可湿性粉剂,适合于现场应用。  相似文献   

18.
The aim of the study was to assess the quality of life (QOL) and the psychological status of parents of children with juvenile chronic arthritis (JCA). The QOL, anxiety and depression of the parents of 28 children with JCA were evaluated and compared to those of the parents of 28 healthy children. Mothers of JCA children and mothers of healthy children reported similar QOL. The reported anxiety and depression levels were similar for mothers and fathers in both groups. The parents of children with pauciarticular-type JCA reported lower QOL and higher levels of anxiety and depression than the parents of children with other types, namely polyarticular and systemic JCA. These findings may be explained by the fact that the pauciarticular patients had shorter disease duration and were less frequently seen in the outpatient clinic. The QOL of mothers of children with JCA was found to be slightly impaired in the group of children with pauciarticular JCA. Future larger studies are needed to confirm these results, as the number of subjects in the three groups was rather low. Received: 26 September 2001 / Accepted: 8 February 2002  相似文献   

19.

Background

A 5-day in-patient study designed to assess the accuracy of the FreeStyle Navigator® Continuous Glucose Monitoring System revealed that the level of accuracy of the continuous sensor measurements was dependent on the rate of glucose change. When the absolute rate of change was less than 1 mg•dl−1•min−1 (75% of the time), the median absolute relative difference (ARD) was 8.5%, with 85% of all points falling within the A zone of the Clarke error grid. When the absolute rate of change was greater than 2 mg•dl−1•min−1 (8% of the time), the median ARD was 17.5%, with 59% of all points falling within the Clarke A zone.

Method

Numerical simulations were performed to investigate effects of the rate of change of glucose on sensor measurement error. This approach enabled physiologically relevant distributions of glucose values to be reordered to explore the effect of different glucose rate-of-change distributions on apparent sensor accuracy.

Results

The physiological lag between blood and interstitial fluid glucose levels is sufficient to account for the observed difference in sensor accuracy between periods of stable glucose and periods of rapidly changing glucose.

Conclusions

The role of physiological lag on the apparent decrease in sensor accuracy at high glucose rates of change has implications for clinical study design, regulatory review of continuous glucose sensors, and development of performance standards for this new technology. This work demonstrates the difficulty in comparing accuracy measures between different clinical studies and highlights the need for studies to include both relevant glucose distributions and relevant glucose rate-of-change distributions.  相似文献   

20.
The constancy of the hydrogen consuming flora of the human colon was studied in 15 healthy subjects via two measurements obtained 18 to 36 months apart. Hydrogen disappearance rate and the major products of H2-consuming bacteria, methane and sulfide, were measured during incubation of fecal homogenates with excess hydrogen and sulfate. In 11/15, the hydrogen consumption rate and the predominant hydrogen-consuming pathway (methanogenesis, sulfate reduction, or neither) remained constant. However, major shifts in these pathways were observed in four subjects, with two losing and two gaining the ability to produce methane. Methanogenesis was associated with the highest hydrogen consumption rate. This study demonstrates that clinically unrecognizable, major alterations of the colonic flora occur in healthy subjects. Understanding of the factors responsible for these alterations might allow for therapeutic manipulation of the colonic flora.Supported in part by the Department of Veterans Affairs and NIDDKD RO1 DK 13309-25.  相似文献   

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