Hypoxia stimulates invasion and migration of human cervical cancer cell lines HeLa/SiHa through the Rab11 trafficking of integrin αvβ3/FAK/PI3K pathway-mediated Rac1 activation
Hypoxia plays a key role in tumour cell survival, invasion, and metastasis. An increasing number of studies have attemptedto characterize the tumour response to hypoxia and to identify predictive markers of disease. Here we show that hypoxiaincreases tumour cell invasion and migration by the modulation of Rab11, an important molecule for vesicular trafficking.In our study, we found that Rab11, together with the activation of Rac1, could stimulate invasion and migration of cervicalcancer cell lines HeLa/SiHa in hypoxia. Activation of Rac1 activity by hypoxia seems to be central to carcinoma invasion.We also found that these effects could be related to the integrin αvβ3. In addition, we studied the molecular pathway for thisprocess. Our results showed that in cervical cancer cell lines HeLa/SiHa, Rac1 activation in hypoxia could stimulateinvasion and migration, and this process was mediated by integrin αvβ3-mediated FAK and PI3K phosphorylation.Furthermore, hypoxia induced a dramatic increase in αvβ3 integrin surface expression, and this increase is dependent onRab11. In conclusion, our study might provide a new mechanism for the effect of hypoxia on stimulating cervicalcarcinoma invasion.