title: Potential ability of morphine to inhibit the adhesion, invasion and metastasis of metastatic colon 26-L5 carcinoma cells.
abstract: Morphine is frequently used for cancer patient's terminal medical care to relieve cancer pain. In the present study, we examined the inhibitory effect of morphine on experimental lung metastasis and invasion of colon 26-L5 cells. Morphine was found to significantly reduce the number of tumor colonies and the weight of the tumor-containing lung. Morphine inhibited the adhesion and migration of colon 26-L5 cells to extracellular matrix components and invasion into reconstituted basement membrane Matrigel, without affecting the cell proliferation in vitro. Notably, naloxone, an antagonist of morphine, abrogated morphine-induced inhibition of tumor cell adhesion, but did not affect the inhibitory effect on the production of matrix metalloproteinases (MMPs) from tumor cells. These results suggest that morphine inhibited the adhesive and invasive properties of tumor cells by different inhibitory mechanisms that involved the mediation of an opioid receptor.
mesh_terms: D000701:Analgesics, Opioid / Q000494:pharmacology*; D000818:Animals; D015153:Blotting, Western; D002448:Cell Adhesion / Q000187:drug effects*; D002465:Cell Movement / Q000187:drug effects*; D003094:Collagen; D003110:Colonic Neoplasms / Q000378:metabolism / Q000473:pathology / Q000517:prevention & control*; D004305:Dose-Response Relationship, Drug; D004338:Drug Combinations; D007797:Laminin / Q000494:pharmacology; D008175:Lung Neoplasms / Q000378:metabolism / Q000517:prevention & control* / Q000556:secondary; D008297:Male; D020782:Matrix Metalloproteinases / Q000378:metabolism; D051379:Mice; D008807:Mice, Inbred BALB C; D009020:Morphine / Q000494:pharmacology*; D009361:Neoplasm Invasiveness; D009368:Neoplasm Transplantation; D011509:Proteoglycans; D020133:Reverse Transcriptase Polymerase Chain Reaction; D014407:Tumor Cells, Cultured / Q000187:drug effects / Q000378:metabolism
chemical_list: D000701:Analgesics, Opioid; D004338:Drug Combinations; D007797:Laminin; D011509:Proteoglycans; C059485:matrigel; D009020:Morphine; D003094:Collagen; D020782:Matrix Metalloproteinases