نتایج جستجو برای: ht29
تعداد نتایج: 3169 فیلتر نتایج به سال:
چکیده زمینه و هدف: امروزه باکتری‌های پروبیوتیک مانند لاکتوباسیلوس‌ها به عنوان یکی از عوامل پیشگیری کننده از ابتلا به بسیاری از بیماری‌ها از جمله سرطان شناخته شده‌اند. هدف از این مطالعه بررسی اثرات سمیت سلولی عصاره باکتری بومی‌پروبیوتیک لاکتوباسیلوس کازئی PTCC 1608 بر روی رده سلولی سرطان کولون(HT29) و آنالیز بیان ژنهای آپوپتوزی Bax و Bcl2 بود. روش بررسی: در این مطالعه تجربی، ابتدا عصاره سلولی ...
Background and Objectives: The extensive use of chemical drugs for the treatment and control of chronic and infectious diseases as well as colorectal cancer, has led to an increased demand for natural and safe drugs and preservatives. Therefore, this study aimed to evaluate the presence of functional groups of constituents, total phenol and flavonoids content, radical scavenging potential, and ...
Goblet cell depletion occurs in various forms of colitis, but its mechanism is unknown. We have investigated two linked hypotheses: (i) that bacterial peptides, such as formyl-methionyl-leucyl-phenylalanine (fMLP), interact with epithelial cells inducing the release of chemokines, including interleukin-8 (IL-8), which in turn leads to the recruitment of neutrophils which release mucin secretago...
Mutants of human adenovirus 5 (Ad5) with enhanced oncolytic activity were isolated by using a procedure termed bioselection. Two mutants, ONYX-201 and ONYX-203, were plaque purified from a pool of randomly mutagenized Ad5 that was repeatedly passaged in the human colorectal cancer cell line HT29, and they were subsequently characterized. ONYX-201 and ONYX-203 replicated more rapidly in HT29 cel...
BACKGROUND The vasoactive peptide endothelin 1 (ET-1) acts via two receptors, endothelin receptors A (ET(A)) and B (ET(B)). ET-1 is overexpressed by human cancers in vivo and in vitro and may be mitogenic for cancer cells. METHOD To elucidate if ET-1 is a growth regulator the following were investigated in human colorectal cancer cell lines (LIM1215 and HT29): ET-1 production by ELISA; ET rec...
OBJECTIVES Gastrointestinal disorders caused by Salmonella enterica serovar Enteritidis (SesE) are a significant health problem around the globe. Probiotic bacteria have been shown to have positive effects on the immune responses. Lactobacillus acidophilus was examined for its capability to influence the innate immune response of HT29 intestinal epithelial cells towards SesE. The purpose of thi...
Gastric and enteric Helicobacter species have been associated with malignant and inflammatory diseases of the stomach, liver, gall bladder and intestine. Matrix metalloproteinases (MMPs) participate in degradation of extracellular matrix, which allows bacteria to come in contact with and interact with the cells. Enhanced level of MMPs facilitates metastasis and cell invasion of tumor cells by r...
Cell proliferation and differentiation are influenced by environmental factors, including the extracellular pH. We recently showed, using an ex vivo organ culture system of human mucosal Barrett's esophageal biopsies, that acid has a highly variable effect on cell proliferation and differentiation depending on the pattern of acid exposure. Study of the mechanisms underlying these dynamic effect...
The activation of protein kinases C (PKCs) is an essential step in integrin-dependent cell adhesion and spreading. In this report we examined the effect of the phorbol ester PMA, a PKC activator, on adhesion, spreading and migration of a colon carcinoma cell line, HT29-D4. Treatment with PMA increased the rate of cell spreading and induced the migration of these cells towards purified matrix pr...
سابقه و هدف: امروزه تحقیقات در زمینه نانوذرات برای استفاده تشخیصی و درمان سرطان روبه افزایش است. در این مطالعه سمیت نانوذرات نقره سنتز شده با عصاره گیاه آرتمیزیا روی رده های سلولی سرطان کولون (HT29) و نرمال HEK293 ارزیابی گردید. مواد و روش ها: در این مطالعه سنتز سبز نانوذرات نقره توسط عصاره گیاه آرتمیزیا تورنفورتیانا انجام گرفت. سپس، نانوذرات نقره با روش های طیفسنجی مرئی فرابنفش(UV-vis) ،...
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