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• W1492757902 endingPage "19446" @default.
• W1492757902 startingPage "19441" @default.
• W1492757902 abstract "Primary cultures of murine bone marrow macrophages (BMMs) were prepared from marrow cell suspensions. These cells expressed specific receptors that recognized the transformed conformation of human alpha 2-macroglobulin (alpha 2M) generated by reaction with CH3NH2. alpha 2M receptor expression was regulated by colony-stimulating factor-1 (CSF-1). The BMMs were deprived of CSF-1 for 6 h and then treated with different concentrations of the purified cytokine. After 18 h, binding of 125I-alpha 2M-CH3NH2 was examined at 4 degrees C. Analysis of the saturation isotherms and Scatchard transformations indicated that the KD was not affected by CSF-1 (1.9-2.4 nM), whereas the maximum specific radioligand binding capacity (Bmax) was increased from 5.6 x 10(4) receptors/cell in the absence of CSF-1 to 2.2 x 10(5) and 2.6 x 10(5) receptors/cell for BMMs treated with 1,000 and 10,000 units/ml CSF-1, respectively. The difference in total cellular protein after exposure to different levels of CSF-1 for 18 h was small (1.50-1.92 ng/cell) and not statistically significant. A 6-12-h lag phase was identified between the time of CSF-1 exposure and increased alpha 2M receptor expression. Cycloheximide completely blocked the increase in alpha 2M receptor expression when added simultaneously with the CSF-1; greater than 50% inhibition was observed when the cycloheximide was added up to 8 h later. The RNA synthesis inhibitors, actinomycin D and daunomycin, prevented increased alpha 2M receptor expression when added up to 4 h after the CSF-1, but had no effect at 8 h. At 37 degrees C, uptake and digestion of 125I-alpha 2M-CH3NH2 was increased in BMMs treated with 1,000 units/ml CSF-1 for 18 h compared with untreated cells. These studies demonstrate that CSF-1 increases the expression of alpha 2M receptors in BMMs through a pathway that requires new RNA and protein synthesis. We hypothesize that increased alpha 2M receptor expression may play an important role in cellular growth and differentiation." @default.
• W1492757902 created "2016-06-24" @default.
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• W1492757902 date "1990-11-01" @default.
• W1492757902 modified "2023-10-18" @default.
• W1492757902 title "Colony-stimulating factor-1 modulates alpha 2-macroglobulin receptor expression in murine bone marrow macrophages." @default.
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• W1492757902 doi "https://doi.org/10.1016/s0021-9258(17)45392-0" @default.
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• W1492757902 hasPublicationYear "1990" @default.
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