Resumo

NOVOA-HERRAN, SANDRA SUSANA  e  SANCHEZ-GOMEZ, MYRIAM. IGF-II Stimulates MMP-9 and MMP-2 Activity in a Human Trophoblast Model. Acta biol.Colomb. [online]. 2011, vol.16, n.1, pp.121-132. ISSN 0120-548X.

Invasion of the uterus by first trimester placental extravillous trophoblast (EVT) cells depends on matrix metalloproteinase (MMPs) secretion to degrade the extracellular matrix; among these, MMP-2 and MMP-9 gelatinases play a pivotal role. The aim of this work was to determine the effect of ligands of the insulin-like growth factor system (IGF) on gelatinase activity in HTR8/Svneo cells, a well-established invasive extravillous trophoblast cell line. By zymography assay, we found that treatment with 10 nM IGF-II stimulates proMMP-9 and proMMP-2 activity with a peak at 24 hours, whereas higher IGF-II doses showed an inhibitory effect on the protease activity. Additionally, IGF-II stimulation resulted in the activation of two other gelatinases, with MW around 52 kDa, which remain to be identified. Neither insulin nor IGF-I were able to stimulate the activity of gelatinases at the time and doses utilized in this study. These results support the potential role of the IGF system in the regulation of cell invasion and malignant growth.

Palavras-chave : trophoblast; invasion; IGF; MMP; activity.

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