Anti-AMOTL1 monoclonal antibody Made to order

Natural response to hypoxia critically depends on rapid stabilization of hypoxia-inducible factor (HIF). Under normoxic conditions, HIF-prolyl hydroxylases mark alpha-subunits of HIF for degradation, while hypoxia results in stabilization of HIF-alpha. Oxyquinoline derivatives suppress activity of HIF-prolyl hydroxylases leading to HIF activation in the cell. Here we show that 24-h incubation of BeWo b30 choriocarcinoma cells (a model of trophoblast in the placental barrier) with oxyquinoline derivative leads to a decrease in transepithelial electrical resistance (TEER) of the cell monolayer, while the permeability of the monolayer for FITC-dextran (70 kDa) remains unchanged. These findings suggest that the overall barrier function is preserved, while the structure of intercellular tight junctions can undergo minor changes. Using Affymetrix Human Transcriptome Array 2.0, we showed that the treatment with oxyquinoline derivative was followed by a decrease in the expression of claudins 6 and 7 (CLDN6, CLDN7), occludin (OCLN), contact adhesion molecule 3 (JAM3), and angiomotin-like protein 1 (AMOTL1).

Background: Angiogenesis in the alveolar septa is thought be a critical factor in pulmonary emphysema. Angiomotin-like protein 1 (AmotL1) is involved in angiogenesis via regulating endothelial cell function. However, the role of AmotL1 in the pathogenesis of pulmonary emphysema has not been elucidated. The objective of this study is to evaluate the expression of AmotL1 in lung tissues from a murine model with emphysema, as well as from patients with chronic obstructive pulmonary disease (COPD). Furthermore, we analyzed the regulation of AmotL1 expression by TNF-alpha and IFN-gamma in endothelial cells in vitro. Methods: Nrf2 knockout mice were exposed to cigarette smoke (CS) for 4 weeks, and the down-regulated genes affecting vascularity in the whole lung were identified by microarray analysis. This analysis revealed that the mRNA expression of AmotL1 decreased in response to CS when compared with air exposure. To confirm the protein levels that were indicated in the microarray data, we determined the expression of AmotL1 in lung tissues obtained from patients with COPD and also determined the expression of AmotL1, NR kappa B and I kappa B alpha in cultured normal human lung microvascular endothelial cells (HLMVECs) that were stimulated by TNF-alpha and IFN-gamma. Results: We found that the number of AmotL1-positive vessels decreased in the emphysema lungs compared with the normal and bronchial asthmatic lungs. IFN-gamma pretreatment diminished the TNF-alpha-induced AmotL1 in the cultured HLMVECs by blocking the degradation of I kappa B alpha. Conclusions: These results suggested that IFN-gamma exhibits anti-angiogenesis effects by regulating the expression of TNF-alpha-induced AmotL1 via NF kappa B in emphysema lungs.