Gene/Protein Disease Symptom Drug Enzyme Compound
Pivot Concepts:   Target Concepts:
Query: UNIPROT:P15088 (mast cell)
 14,925 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Rat peritoneal mast cells (RPMC) and rat basophilic leukemia (RBL) cells are representative of connective tissue-type (CTMC) and mucosal-type (MMC) mast cells, respectively. Using polyethylene glycol, we have fused RPMC with 6-thioguanine resistant, HAT (hypoxanthine, aminopterin, thymidine) sensitive RBL-CA10.7 or RBL-CK2 cells, yielding several hybrid rat mast cell lines (HRMC). The hybridomas exhibited different size and cytoplasmic granularity when compared with parental cell lines. Analysis of both high (Fc epsilon RI) and low affinity (Fc epsilon RL) receptors for IgE revealed that the hybrid lines had more variable receptor patterns than the parent lines. Three hybridoma lines were chosen for further study. Differential histochemical staining with alcian blue and safranin O dyes indicated the hybrids to be predominantly of the MMC type: however, a few cells of one of these uncloned hybridomas were found to be of the CTMC type. Attempts to isolate the CTMC hybridomas yielded one culture which was predominantly of the CTMC phenotype and in a number of other cultures, cells were found expressing simultaneously both the CTMC and the MMC phenotype. After 3 weeks in culture, however, all hybridomas, including those which were cloned further, expressed only the MMC histochemical phenotype. This was found to correlate with the presence of rat mast cell protease II (RMCPII) and the absence of RMCPI in all hybridomas, as detected by Western blot analysis. In addition, the histamine content of all cells was significantly lower than that of the parent RPMC. Most hybrid mast cells expressed both Fc epsilon RI and Fc epsilon RL which in some cases exhibited significant variations in the Mr. These results indicate that somatic cell hybrids expressing the MMC and CTMC phenotype can be produced by the fusion of RBL and RPMC. The CTMC phenotype, however, is unstable, and possible reasons for this are discussed.
 ...
PMID:Establishment and characterization of hybrid rat mast cells. 182 10

Twelve continuous rat tissue cultured mast cell (MC) lines were established by prolonged culture of rat peritoneal MC in the absence of added factors or feeder layers. Two of these lines, RCMC1 and RCMC2, have been briefly described previously, seven others are now also described. Both RCMC1 and RCMC2 lack a marker chromosomes present on RBL-CA10.7 cells. All lines were found to express the phenotype of mucosal MC as defined by alcian blue-positive and safranin O-negative staining, the presence of rat MC protease II and a low histamine content. When analyzed for high-(Fc epsilon RI) and low-affinity (Fc epsilon RL) receptors for IgE, the various lines yielded a variety of receptor patterns. Northern blot analysis of the RNA of RCMC1, RCMC2 and RBL-CA10.7 revealed that all three cell lines contained the same mRNA species for the alpha, beta and gamma subunits for Fc epsilon RI previously found in another rat basophilic leukemia cell line. Quantitation of the relative amounts of alpha, beta and gamma mRNA did not correlate with the expression of the relative amounts of Fc epsilon RI(alpha) in these cells. The relative amounts of mRNA for all these subunits of RCMC2 were equal or higher than those of RCMC1, suggesting that the low expression of Fc epsilon RI(alpha) on the former was a consequence of post-transcriptional events. Analysis of a RCMC1 clone over a 6-month period revealed changes in the expression of both Fc epsilon RI(alpha) and Fc epsilon RL.
 ...
PMID:Characterization of rat tissue cultured mast cells. 213 80