Abstract：
:Human recombinant interleukin 1 alpha (IL-1 alpha) and IL-1 beta inhibited the replication of the mammary tumor cell line, MDA-MB-415; stimulated division in the colon carcinoma, SW-48; and had no effect on the growth of the milk mammary line, HBL-100. Inhibition of growth was reflected in a significant decrease in DNA synthesis accompanying a transient increase in RNA synthesis. Specific binding of 125I-labeled recombinant IL-1 beta by MDA-MB-415 and SW-48 reached a maximum by 2 h of incubation, and an equivalent amount was bound by each cell type. Binding was inhibited in a dose-dependent manner by unlabeled IL-1 alpha or IL-1 beta. Scatchard plot analysis revealed that MDA-MB-415 cells expressed approximately 700 binding sites with an apparent dissociation constant of 8.8 x 10(-10) M. Reversibility of growth inhibition was independent of dose or time of incubation, but DNA synthesis did not return to control values. Flow cytometric analysis of DNA content showed that growth inhibition was cell cycle phase nonspecific with a slight reduction in the proportion of cells in S phase. The major conclusion from these studies was that inhibition or stimulation of malignant cell growth by IL-1 was related to the presence of receptor sites.
journal_name
Cancer Resjournal_title
Cancer researchauthors
Gaffney EV,Koch G,Tsai SC,Loucks T,Lingenfelter SEsubject
Has Abstractpub_date
1988-10-01 00:00:00pages
5455-9issue
19eissn
0008-5472issn
1538-7445journal_volume
48pub_type
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