Gene/Protein Disease Symptom Drug Enzyme Compound
Pivot Concepts:   Target Concepts:
Query: UMLS:C0699790 (colon cancer)
 28,837 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

We performed radionuclide scanning after the intravenous injection of human IgG labeled with indium-111 in 128 patients with suspected focal sites of inflammation. Localization of 111In-labeled IgG correlated with clinical findings in 51 infected patients (21 with abdominal or pelvic infections, 11 with intravascular infections, 7 with pulmonary infections, and 12 with skeletal infections). Infecting organisms included gram-positive bacteria, gram-negative bacteria, Pneumocystis carinii, Mycoplasma pneumoniae, and Candida albicans. No focal localization of 111In-labeled IgG was observed in 63 patients without infection. There were five false negative results, and nine results were unusable. Serial scans were carried out in eight patients: continued localization correctly predicted relapse in six, and the absence of localization indicated resolution in two. To determine whether 111In-labeled IgG localization was specific for inflammation, we studied 16 patients with cancer. Focal localization occurred in 13 of these patients (5 with melanomas, 5 with gynecologic cancers, and 1 each with lymphoma, prostate cancer, and malignant fibrous histiocytoma). No localization was seen in patients with renal or colon cancer or metastatic medullary carcinoma of the thyroid. We conclude that 111In-labeled IgG imaging is effective for the detection of focal infection and that serial scans may be useful in assessing therapeutic efficacy. This technique may also be helpful in the evaluation of certain cancers.
 ...
PMID:111In-labeled nonspecific immunoglobulin scanning in the detection of focal infection. 281 44

We found that mycoplasma-infected cells have a higher ability to metastasize in vivo than non-mycoplasma-infected cells. To investigate this phenomenon, we obtained a monoclonal antibody, MAb 243-5, by immunization with Mycoplasma arginini-infected RPMI 4788 cells. This MAb recognized a mycoplasmal protein with an MW of 47 kDa and completely inhibited the experimental metastasis of M. arginini-infected RPMI 4788 cells using a nude mouse model. Using this MAb, we purified a molecule called Ag 243-5 and determined the N-terminal amino acid sequence and clarified the entire nucleotide sequence of the Ag 243-5 gene. PCR analysis showed the existence of a homologous gene in Mycoplasma hyorhinis. Four sequential injections of Ag 243-5 (30 micrograms/shot) promoted the experimental metastasis of non-mycoplasma-infected RPMI 4788 cells more than 10-fold using a nude mouse model. Ag 243-5 also promoted the experimental metastasis of the non-mycoplasma-infected mouse colon cancer cell line colon 26. This metastasis-promoting effect was neutralized by MAb 243-5.
 ...
PMID:Metastasis-promoting activity of a novel molecule, Ag 243-5, derived from mycoplasma, and the complete nucleotide sequence. 855 70

Infection with mycoplasma is a common problem in cell cultures, with Mycoplasma hyorhinis being the predominant species. Here we investigate the effect of M. hyorhinis infection on L-arginine metabolism, with focus on iNOS-mediated NO synthesis in murine keratinocytes and the human colon cancer cell line DLD-1. iNOS and arginase are L-arginine-metabolizing enzymes involved in the regulation of inflammatory processes, with NO contributing to innate immunity. In murine cells, M. hyorhinis infection enhances cytokine-induced iNOS expression and augments iNOS activity, whereas in the absence of cytokines it causes de novo induction of iNOS mRNA without subsequent translation into iNOS protein. In turn, arginase-1 mRNA expression is diminished in M. hyorhinis-infected murine keratinocytes, resulting in decreased arginase activity. One of the underlying upstream mechanisms is NF-kappaB activation. In contrast, in human cells neither iNOS mRNA nor protein expression is affected by M. hyorhinis infection, but NO synthesis is enhanced, which may be caused by increased L-arginine import. This demonstrates that infection with M. hyorhinis leads to different effects on gene regulation of the murine and human iNOS gene. Our study underlines the importance of routine checking of cell cultures for mycoplasma contamination, particularly in studies on NO-mediated effects or inflammatory processes.
 ...
PMID:Impact of Mycoplasma hyorhinis infection on L-arginine metabolism: differential regulation of the human and murine iNOS gene. 1621 77