Microanalysis of Brain Angiotensin Peptides Using Ultrasensitive Capillary Electrophoresis Trapped Ion Mobility Mass Spectrometry

Authors

Kellen DeLaney, Department of Chemistry & Biochemistry, University of Maryland, 8051 Regents Drive, College Park, Maryland 20742, United States.
Dashuang Jia, Department of Chemistry & Biochemistry, University of Maryland, 8051 Regents Drive, College Park, Maryland 20742, United States.
Laxmi Iyer, Department of Pharmacology & Physiology, School of Medicine and Health Sciences, The George Washington University, Washington, D.C. 20037, United States.
Zhe Yu, Department of Pharmacology & Physiology, School of Medicine and Health Sciences, The George Washington University, Washington, D.C. 20037, United States.
Sam B. Choi, Department of Chemistry & Biochemistry, University of Maryland, 8051 Regents Drive, College Park, Maryland 20742, United States.
Paul J. Marvar, Department of Pharmacology & Physiology, School of Medicine and Health Sciences, The George Washington University, Washington, D.C. 20037, United States.
Peter Nemes, Department of Chemistry & Biochemistry, University of Maryland, 8051 Regents Drive, College Park, Maryland 20742, United States.

Document Type

Journal Article

Publication Date

6-28-2022

Journal

Analytical chemistry

Volume

94

Issue

25

DOI

10.1021/acs.analchem.2c01062

Abstract

While the role of the renin-angiotensin system (RAS) in peripheral circulation is well characterized, we still lack an in-depth understanding of its role within the brain. This knowledge gap is sustained by lacking technologies for trace-level angiotensin detection throughout tissues, such as the brain. To provide a bridging solution, we enhanced capillary electrophoresis (CE) nanoflow electrospray ionization (ESI) with large-volume sample stacking and employed trapped ion mobility time-of-flight (timsTOF) tandem HRMS detection. A dynamic pH junction helped stack approximately 10 times more of the sample than optimal using the field-amplified reference. In conjunction, the efficiency of ion generation was maximized by a cone-jet nanospray on a low sheath-flow tapered-tip nano-electrospray emitter. The platform provided additional peptide-dependent information, the collision cross section, to filter chemical noise and improve sequence identification and detection limits. The lower limit of detection reached sub-picomolar or ∼30 zmol (∼18,000 copies) level. All nine targeted angiotensin peptides in mouse tissue samples were detectable and quantifiable from the paraventricular nucleus (PVN) of the hypothalamus even after removal of circulatory blood components (perfusion). We anticipate CE-ESI with timsTOF HRMS to be broadly applicable for the ultrasensitive detection of brain peptidomes in pursuit of a better understanding of the brain.

APA Citation

DeLaney, Kellen; Jia, Dashuang; Iyer, Laxmi; Yu, Zhe; Choi, Sam B.; Marvar, Paul J.; and Nemes, Peter, "Microanalysis of Brain Angiotensin Peptides Using Ultrasensitive Capillary Electrophoresis Trapped Ion Mobility Mass Spectrometry" (2022). GW Authored Works. Paper 1061.
https://hsrc.himmelfarb.gwu.edu/gwhpubs/1061

Department

Pharmacology and Physiology