POSSIBLE ROLE OF TRPV-1 AND AQPS IN THE REGULATION OF TROPHOBLAST CELL VOLUME

NORA MARTÍNEZ; JULIETA REPPETTI; CYNTIA ABÁN; GRACIELA MOYA; MARIANA FARINA; ALICIA E DAMIANO

Mar del Plata

Simposio; VI SLIMP - Latin American Symposium on Maternal-Fetal Interaction and Placenta and V LASRI - Latin American Symposium on Reproductive Immunology; 2015

Mammal cells have homeostatics mechanisms that maintain body-fluid osmolality near to 300 mOsm/kg through the intake or excretion of water and salts. This osmoregulation is vital to prevent changes in cell volume that results in an irreversible damage. Transient receptor potencial vanilloid type-1 (TRPV-1) is a cation channel that mediates Ca2+ influx in response to osmotic stress, acting like a hypertonicity sensor. Recently, we have described TRPV-1 in trophoblast cells. Aquaporins (AQPs) are a family of small integral membrane proteins that facilitate osmotically driven water transport. Although AQP1, AQP3 and AQP9 are highly expressed in trophoblast during early gestation, their role is still unknown. OBJECTIVE: To evaluate the contribution of AQPs and TRPV-1 in cell volume regulation of first trimester trophoblast and the consequences on the cell viability. METHODS: TRPV-1, AQP3 and AQP9 protein expressions were analyzed by Western blot and immunohistochemistry in first trimester human chorionic villi sample (CVS) and in Swan-71 cell line. The effect of hyperosmolarity on each protein expression was evaluated in Swan-71 before and after the inhibition of AQPs with HgCl2. Cell viability was analyzed by MTT assay and cleaved caspase-3 expression. RESULTS: TRPV-1, AQP3 and AQP9 expression was found in CVS and Swan-71 cells. After exposition to hyperosmolarity, we observed that the expression of the three proteins increased (p