Gene/Protein Disease Symptom Drug Enzyme Compound
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Query: UMLS:C0677930 (primary tumor)
 20,210 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

In some human tumors, reduced or defective MHC class I surface expression has been attributed to functional deficiencies of the genes of the antigen-processing machinery, the proteasome subunits low molecular weight (LMP)-2 and LMP-7, as well as the peptide transporters associated with antigen processing (TAP)-1 and TAP-2. Using normal epithelial kidney cells (MZ1851NN) and renal cell carcinoma cell lines established from the primary tumor (MZ1851RC) and a lymph node metastasis (MZ1851LN) of the same patient, we investigated whether the modulation of MHC class I antigens, TAP and LMP molecules, occurs during transformation and subsequent progression. The mRNA and protein expression of MHC class I heavy and light chain TAP and LMP was strongly reduced in MZ1851RC when compared to the corresponding normal kidney cells MZ1851NN, and this suppression was even more pronounced in the metastatic cell line MZ1851LN. In addition, the activity of the TAP molecules, as measured by peptide translocation assays, was also markedly diminished in MZ1851RC compared to MZ1851NN cells and was further down-regulated in cells of the metastatic lesion. MHC class I surface expression was enhanced by either culturing MZ1851RC and MZ1851LN cells at 26 degrees C instead of 37 degrees C or by incubation of both cell lines with class I-specific binding peptides, whereas MHC class I surface expression of MZ1851NN cells was not affected under these culture conditions. IFN-alpha and in particular IFN-gamma treatment enhances the steady-state mRNA and/or protein levels of TAP, LMP, and MHC class I genes of MZ1851 cell lines but had no additional effect on the stability of MCH class I surface expression. These data indicate that malignant transformation and subsequent in vivo selection of renal tubular cells can lead to the recovery of carcinoma cells that show stable expression of an immune escape phenotype. Deficiencies associated with this phenotype involve all levels of the MHC class I-restricted antigen presentation machinery, are at least partially reversible by IFN treatment, and are even more pronounced in cells that had acquired metastatic potential.
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PMID:Analysis of the major histocompatibility complex class I antigen presentation machinery in normal and malignant renal cells: evidence for deficiencies associated with transformation and progression. 862 Apr 89

A newborn baby boy was diagnosed with the mixed form of congenital mesoblastic nephroma (CMN) representing both classic and cellular histology features in the renal tumor. Additionally, the patient had skin and bone lesions consistent with multifocal involvement of a generalized infantile fibromatosis (IFS). Both skin and bone lesions were distinctly different from CMN and did not represent metastasis. The primary tumor cell line (MCH-MN-1), established from the resected right kidney tumor, had a diploid DNA content. Cytogenetic studies revealed deletion on the long arm of chromosome 3 (q21q24) and duplication on the short arm of chromosome 11 (p15). MCH-MN-1 cells expressed ETV6-NTRK3 gene fusion transcripts, characteristic of cellular and mixed forms of CMNs. The cells had high p21 and low Bax mRNA expression in the reverse transcriptase-polymerase chain reaction (RT-PCR) assay. The high level of proliferative marker (Ki67) mRNA expression correlated well with the pluripotent nature of MCH-MN-1 in tissue culture (cell doubling time = 12.4 h). Our results showed that MCH-MN-1 might be a good model cell line for investigations on mesoblastic nephroma.
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PMID:Cytogenetic and molecular characterization of a congenital mesoblastic nephroma. 1144 43