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• W4386529464 abstract "Background The renin‐angiotensin system plays a crucial role in human physiology, and its main hormone, angiotensin, activates 2 G‐protein–coupled receptors, the angiotensin type‐1 and type‐2 receptors, in almost every organ. However, controversy exists about the location, distribution, and expression levels of these receptors. Concerns have been raised over the low sensitivity, low specificity, and large variability between lots of commercially available antibodies for angiotensin type‐1 and type‐2 receptors, which makes it difficult to reconciliate results of different studies. Here, we describe the first non–antibody‐based sensitive and specific targeted quantitative mass spectrometry assay for angiotensin receptors. Methods and Results Using a technique that allows targeted analysis of multiple peptides across multiple samples in a single mass spectrometry analysis, known as TOMAHAQ (triggered by offset, multiplexed, accurate mass, high resolution, and absolute quantification), we have identified and validated specific human tryptic peptides that permit identification and quantification of angiotensin type‐1 and type‐2 receptors in biological samples. Several peptide sequences are conserved in rodents, making these mass spectrometry assays amenable to both preclinical and clinical studies. We have used this method to quantify angiotensin type‐1 and type‐2 receptors in postmortem frontal cortex samples of older adults (n=28) with Alzheimer dementia. We correlated levels of angiotensin receptors to biomarkers classically linked to renin‐angiotensin system activation, including oxidative stress, inflammation, amyloid‐β load, and paired helical filament‐tau tangle burden. Conclusions These robust high‐throughput assays will not only catalyze novel mechanistic studies in the angiotensin research field but may also help to identify patients with an unbalanced angiotensin receptor distribution who would benefit from angiotensin receptor blocker treatment." @default.
• W4386529464 created "2023-09-09" @default.
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• W4386529464 date "2023-09-19" @default.
• W4386529464 modified "2023-10-16" @default.
• W4386529464 title "Decoding Angiotensin Receptors: TOMAHAQ‐Based Detection and Quantification of Angiotensin Type‐1 and Type‐2 Receptors" @default.
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• W4386529464 doi "https://doi.org/10.1161/jaha.123.030791" @default.
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• W4386529464 hasPublicationYear "2023" @default.
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