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The use of cultured cells as a tool for research, precision medicine, biopharmacy, and biomanufacturing is constantly increasing. In parallel, the role of cell-cell and cell-substratum contacts in cell functioning is increasingly validated. Adhesion signalling plays a key role here. The activity of cell fate-regulating signalling molecules is an important factor in determining cell behaviour, as well as their response to treatment, depending on cell phenotypic status and location in the body. Three cellular state models (adherent, single cells in suspension, and aggregated cells) were compared for cell signalling, including focal adhesion (FAK), mitogen-activated (MAPK), as well as Akt protein kinases, and transcription factor cJun, by using lung adenocarcinoma A549, muscle-derived stem Myo, as well as primary lung cancer cell lines. Survival of both A549 and Myo cells was dependent on kinases Akt and ERK in detached conditions. Intercellular contacts in aggregates promoted activation of Akt and ERK, and cell survival. Loss of contacts with the substrate increased phosphorylation of MAP kinases JNK and p38, while decreased Akt phosphorylation by processes involving FAK. Unexpectedly, detachment increased phosphorylation of antiapoptotic kinase ERK in A549, while in Myo stem cells ERK phosphorylation was downregulated. JNK target transcription factor cJun protein level was markedly diminished by contacts between cells possibly involving mechanism of proteasomal degradation. Furthermore, studies revealed the opposite dependence of molecules of the same signalling pathway - phospho-cJun and phospho-JNK - on cell culture density. Differences in ERK activation under detachment conditions indicate that targeting of prosurvival kinases during anoikis should be different in different cells. Moreover, the outcome of JNK activation in cells may depend on the amount of cJun, which is determined by cell-cell contacts.
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