Extracellular pressure stimulates adhesion of sarcoma cells via activation of focal adhesion kinase and Akt

Background

The effect of extracellular pressure on adhesion and adhesiogenic focal adhesion kinase (FAK) and Akt signaling in sarcomas was investigated.

Methods

Human sarcoma cells (HT-1080 fibrosarcoma, KHOS-240S osteosarcoma, and A-673 rhabdomyosarcoma) were subjected to increased pressure followed by adhesion assay. Two cell lines were pretreated with the FAK inhibitor 1,2,4,5-benzenetetraamine tetrahydrochloride (Y15) or Akt IV inhibitor, followed by Western analysis for activated FAK and Akt. Parallel studies were conducted in cells from a resected human fibrous histiosarcoma.

Results

Pressure increased adhesion in all 3 sarcoma lines and primary histosarcoma cells by 7% to 18% (n = 6; P < .01 each). Pressure activated FAK and Akt (n = 5; P < .01). Inhibiting FAK or Akt inhibited FAK or Akt phosphorylation and the stimulation of adhesion by increased pressure (n = 5 each; P < .01 each).

Conclusions

Pressure increases sarcoma cell adhesiveness via Akt and FAK. Perioperative manipulation or forces in lymphatic or circulatory systems may potentiate local recurrence or distant metastasis.