Abstract
In the field of protein biology, immunology-based techniques are continuously evolving for the detection and quantification of individual protein levels, protein-protein interaction, and protein modifications in cells and tissues. The proximity ligation assay (PLA), a method of detection that combines immunologic and PCR-based approaches, was developed to overcome some of the drawbacks that are inherent with other detection methods. The PLA allows for very sensitive and discretely quantifiable measures of unmodified, native protein levels and protein-protein interaction/modification complexes in situ in both fixed tissues and cultured cells. We describe herein the PLA method and its applicability to quantify the effects of estrogen on expression of angioregulatory factors, e.g., endothelial nitric oxide synthase (eNOS) in the vasculature, vascular endothelial growth factor (VEGF) in the placenta, and melanocortin 2 receptor (MC2R)/accessory protein (MRAP) in the fetal adrenal of the nonhuman primate.
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