title: Interleukin 1 increases collagen type IV production by murine mammary epithelial cells.
abstract: The effects of human interleukin 1 (IL 1) on collagen type IV production by normal mouse mammary epithelial cells were examined. Human IL 1 was derived from the culture media of peripheral blood monocytes or placental cells that were stimulated with silica. Although crude culture media of silica-stimulated monocytes or placental cells had no enhancing activity for type IV collagen production, IL 1-containing fractions obtained by Sephacryl S-200 gel chromatography and isoelectrofocusing from such media possessed considerable activity. To confirm the effects of IL 1 on collagen production, human monocyte-derived IL 1 was highly purified by sequential isoelectrofocusing, anion-exchange (AX 300), high-performance liquid chromatography (HPLC), and HPLC gel filtration (TSK 3000). The same HPLC gel filtration fractions contained both an activity that stimulated collagen synthesis by mammary cells and thymocyte growth-promoting activity. These activities of IL 1 differed from a number of other factors, such as epidermal growth factor and another factor produced by placental cells that stimulated type IV collagen production but not thymocyte proliferation. In fact, IL 1 induced 100-fold less collagen type IV production by mammary epithelial cells than was needed to induce thymocyte proliferation. Our data suggest that IL 1-like molecules, which reportedly are produced by many tissue cell types, may therefore play a role in promoting a basement membrane formation at stromal-epithelial boundaries.
mesh_terms: D000818:Animals; D002478:Cells, Cultured; D003094:Collagen / Q000096:biosynthesis*; D004306:Dose-Response Relationship, Immunologic; D004848:Epithelium / Q000378:metabolism; D005260:Female; D006801:Humans; D007375:Interleukin-1 / Q000302:isolation & purification / Q000502:physiology*; D008321:Mammary Glands, Animal / Q000166:cytology*; D051379:Mice; D008809:Mice, Inbred C3H; D009000:Monocytes / Q000378:metabolism; D010920:Placenta / Q000166:cytology / Q000378:metabolism
chemical_list: D007375:Interleukin-1; D003094:Collagen