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Grashei M, Wodtke P, Skinner JG, Sühnel S, Setzer N, Metzler T, Gulde S, Park M, Witt D, Mohr H, Hundshammer C, Strittmatter N, Pellegata NS, Steiger K, Schilling F. Simultaneous magnetic resonance imaging of pH, perfusion and renal filtration using hyperpolarized 13C-labelled Z-OMPD. Nat Commun 2023; 14:5060. [PMID: 37604826 PMCID: PMC10442412 DOI: 10.1038/s41467-023-40747-3] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2022] [Accepted: 08/09/2023] [Indexed: 08/23/2023] Open
Abstract
pH alterations are a hallmark of many pathologies including cancer and kidney disease. Here, we introduce [1,5-13C2]Z-OMPD as a hyperpolarized extracellular pH and perfusion sensor for MRI which allows to generate a multiparametric fingerprint of renal disease status and to detect local tumor acidification. Exceptional long T1 of two minutes at 1 T, high pH sensitivity of up to 1.9 ppm per pH unit and suitability of using the C1-label as internal frequency reference enables pH imaging in vivo of three pH compartments in healthy rat kidneys. Spectrally selective targeting of both 13C-resonances enables simultaneous imaging of perfusion and filtration in 3D and pH in 2D within one minute to quantify renal blood flow, glomerular filtration rates and renal pH in healthy and hydronephrotic kidneys with superior sensitivity compared to clinical routine methods. Imaging multiple biomarkers within a single session renders [1,5-13C2]Z-OMPD a promising new hyperpolarized agent for oncology and nephrology.
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Affiliation(s)
- Martin Grashei
- Department of Nuclear Medicine, TUM School of Medicine, Klinikum rechts der Isar, Technical University of Munich, D-81675, Munich, Germany
| | - Pascal Wodtke
- Department of Nuclear Medicine, TUM School of Medicine, Klinikum rechts der Isar, Technical University of Munich, D-81675, Munich, Germany
| | - Jason G Skinner
- Department of Nuclear Medicine, TUM School of Medicine, Klinikum rechts der Isar, Technical University of Munich, D-81675, Munich, Germany
| | - Sandra Sühnel
- Department of Nuclear Medicine, TUM School of Medicine, Klinikum rechts der Isar, Technical University of Munich, D-81675, Munich, Germany
| | - Nadine Setzer
- Department of Nuclear Medicine, TUM School of Medicine, Klinikum rechts der Isar, Technical University of Munich, D-81675, Munich, Germany
| | - Thomas Metzler
- Comparative Experimental Pathology (CEP), Institute of Pathology, School of Medicine, Technical University of Munich, D-81675, Munich, Germany
| | - Sebastian Gulde
- Institute for Diabetes and Cancer, Helmholtz Zentrum München, D-85764, Neuherberg, Germany
| | - Mihyun Park
- Department of Biosciences, TUM School of Natural Sciences, Technical University of Munich, D-85748, Garching, Germany
| | - Daniela Witt
- Department of Biosciences, TUM School of Natural Sciences, Technical University of Munich, D-85748, Garching, Germany
| | - Hermine Mohr
- Institute for Diabetes and Cancer, Helmholtz Zentrum München, D-85764, Neuherberg, Germany
| | - Christian Hundshammer
- Department of Nuclear Medicine, TUM School of Medicine, Klinikum rechts der Isar, Technical University of Munich, D-81675, Munich, Germany
| | - Nicole Strittmatter
- Department of Biosciences, TUM School of Natural Sciences, Technical University of Munich, D-85748, Garching, Germany
| | - Natalia S Pellegata
- Institute for Diabetes and Cancer, Helmholtz Zentrum München, D-85764, Neuherberg, Germany
- Department of Biology and Biotechnology, University of Pavia, I-27100, Pavia, Italy
| | - Katja Steiger
- Comparative Experimental Pathology (CEP), Institute of Pathology, School of Medicine, Technical University of Munich, D-81675, Munich, Germany
| | - Franz Schilling
- Department of Nuclear Medicine, TUM School of Medicine, Klinikum rechts der Isar, Technical University of Munich, D-81675, Munich, Germany.
- Munich Institute of Biomedical Engineering, Technical University of Munich, D-85748, Garching, Germany.
- German Cancer Consortium (DKTK), Partner Site Munich and German Cancer Research Center (DKFZ), D-69120, Heidelberg, Germany.
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Dal Canton A, Stanziale R, Corradi A, Andreucci VE, Migone L. Effects of acute ureteral obstruction on glomerular hemodynamics in rat kidney. Kidney Int 1977; 12:403-11. [PMID: 609190 DOI: 10.1038/ki.1977.131] [Citation(s) in RCA: 60] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
In order to study the effects of acute ureteral obstruction on glomerular hemodynamics, glomerular hydrostatic capillary pressure (PG), pressure in the first-order peritubular capillaries (EAP), and intratubular pressure (PT) were directly measured in superficial nephrons on Munich-Wistar rats by micropuncture with a servo-nulling device, in control conditions and one to two hours after ureteral ligation. Single nephron filtration fraction (SNFF) was calculated from arterial and peritubular blood protein concentration. SNGFR was measured by conventional micropuncture techniques in control conditions and was calculated from efferent arteriole blood flow (EABF) and SNFF during ureteral obstruction. EABF was obtained by timed complete collection of blood from superficial efferent arterioles. Afferent arteriole blood flow (AABF) and resistance of afferent (Ra) and efferent arterioles (Re) were calculated from conventional equations. Ureteral obstruction markedly increased PT from 12.9 +/- 1.4 to 36.8 +/- 6.1 (SD) mm Hg. The fall in SNGFR (from 23.3 +/- 6.4 to 17.9 +/- 5.2 [SD] nl/min) was blunted by the rise in PG (from 45.5 +/- 3.6 to 59.3 +/- 4.0 [SD] mm Hg) and AABF (from 130.0 +/- 59.1 to 144.2 +/- 69.0 [SD] nl/min), secondary to a fall in Ra. These results demonstrate that SNGFR is maintained early after complete ureteral obstruction because of afferent arteriole dilatation.
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