IFIBIO HOUSSAY   25014
INSTITUTO DE FISIOLOGIA Y BIOFISICA BERNARDO HOUSSAY
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Participation of endocannabinoids in placental apoptosis
Autor/es:
ABAN CYNTIA; MARTINEZ, NORA; CAROU, C; TRIGUBO, D; LEGUIZAMON GUSTAVO; FRANCHI ANA; DAMIANO ALICIA E; FARINA MARIANA
Lugar:
Mar del Plata
Reunión:
Simposio; VI LatinAmerican Symposium on Maternal-Fetal Interaction & Placenta; 2015
Institución organizadora:
Placenta Association of the Americas- Grupo Latinoamericano de placenta
Resumen:
Apoptosis is an important process that plays a major role in the physiological development of human placenta. It was observed that an aberrant cell turnover including an increased apoptosis are implicated in pathogenesis of many disorders of pregnancy. Hypoxia inducible Factors (HIFs) act as key regulators of trophoblast invasion and differentiation through regulation of the expression of different genes. The catalitical HIF1α subunit is expressed in human placentas and can also induce genes involved in cell death. Endocannabinoids (ECs) are bioactive lipids implicated in placental physiology that exert their effect by the activation of cannabinoid receptors CB1 and CB2. ECs, together with their receptors are part of the Endocannabinoid System (ES) and could induce apoptosis in different cell types including cytotrophoblast cells. Previously, we demonstrated that ES is present in human term placenta. OBJECTIVE: To investigate the participation of ECs in human placental apoptosis generated by HIF1α. METHODS: Explants obtained from normal placentas (n=8) were cultured with Cobalt chloride (CoCl2, hypoxia-mimetic agent), Met-AEA (a stable EC agonist) and/or AM251 (CB1 antagonist). Explants viability was evaluated by MTT assay. Cleaved caspase-3, Bax and Bcl-2 protein expression and caspase-3 activity were determined as apoptotic parameters. RESULTS: CoCl2 treatment induced a decrease in the viability of the placental tissue. Instead, co-incubation with AM251 blocked this effect. Incubation with CoCl2 or Met-AEA increased caspase 3 cleaved (active form) expression. Additionally, we detected an increase in Bax/Bcl-2 ratio and caspase 3 activity. The expression and enzymatic activity of these proteins diminished after co-incubation with AM251 (p