Autocrine/paracrine erythropoietin signalling promotes JAK/STAT‐dependent proliferation of human cervical cancer cells

TV Lopez, TRJ Lappin, P Maxwell, Z Shi… - … journal of cancer, 2011 - Wiley Online Library
TV Lopez, TRJ Lappin, P Maxwell, Z Shi, R Lopez‐Marure, C Aguilar, L Rocha‐Zavaleta
International journal of cancer, 2011Wiley Online Library
Erythropoietin (Epo) regulates erythropoiesis by binding to its receptor (EpoR) and
promoting cell proliferation, differentiation and inhibition of apoptosis. Epo is widely used to
treat cervical cancer‐related anaemia. However, there are data suggesting that
administration of Epo is associated with an increment in recurrence rate, and decreased
disease‐free and overall survival. In the present study, we investigated the expression of
Epo and EpoR on cervical cancer cell lines. We observed that both EpoR and extracellular …
Abstract
Erythropoietin (Epo) regulates erythropoiesis by binding to its receptor (EpoR) and promoting cell proliferation, differentiation and inhibition of apoptosis. Epo is widely used to treat cervical cancer‐related anaemia. However, there are data suggesting that administration of Epo is associated with an increment in recurrence rate, and decreased disease‐free and overall survival. In the present study, we investigated the expression of Epo and EpoR on cervical cancer cell lines. We observed that both EpoR and extracellular Epo are constitutively expressed in cervical cancer cells. Inhibition of either Epo or EpoR expression with siRNA attenuated cell proliferation, whereas addition of exogenous Epo led to a significant increase in cell growth, both in vitro and in vivo. Epo‐induced proliferation was associated with the activation of JAK2, JAK3, STAT3 and STAT5 but not JAK1 and STAT1. Our results are consistent with the existence of a functional, endogenous Epo/EpoR system in cervical cancer with the capacity to activate the transduction of signals resulting in an increased proliferation potential.
Wiley Online Library