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. 2023 Aug;90(2):655-663.
doi: 10.1002/mrm.29649. Epub 2023 Mar 27.

Assessment of focal renal ischemia-reperfusion injury in a porcine model using hyperpolarized [1-13 C]pyruvate MRI

Uffe Kjaergaard  1 , Nikolaj Bøgh  1 , Esben Søvsø Szocska Hansen  1 , Rasmus Stilling Tougaard  1   2 , Lotte Bonde Bertelsen  1 , Rolf F Schulte  3 , Christoffer Laustsen  1
Affiliations

Assessment of focal renal ischemia-reperfusion injury in a porcine model using hyperpolarized [1-13 C]pyruvate MRI

Uffe Kjaergaard et al. Magn Reson Med. 2023 Aug.

Abstract

Purpose: Ischemic injury in the kidney is a common pathophysiological event associated with both acute kidney injury and chronic kidney disease; however, regional ischemia-reperfusion as seen in thromboembolic renal disease is often undetectable and thus subclinical. Here, we assessed the metabolic alterations following subclinical focal ischemia-reperfusion injury with hyperpolarized [1-13 C]pyruvate MRI in a porcine model.

Methods: Five pigs were subjected to 60 min of focal kidney ischemia. After 90 min of reperfusion, a multiparametric proton MRI protocol was performed on a clinical 3T scanner system. Metabolism was evaluated using 13 C MRI following infusion of hyperpolarized [1-13 C]pyruvate. Ratios of pyruvate to its detectable metabolites (lactate, bicarbonate, and alanine) were used to quantify metabolism.

Results: The focal ischemia-reperfusion injury resulted in injured areas with a mean size of 0.971 cm3 (±1.019). Compared with the contralateral kidney, the injured areas demonstrated restricted diffusion (1269 ± 83.59 × 10-6 mm2 /s vs. 1530 ± 52.73 × 10-6 mm2 /s; p = 0.006) and decreased perfusion (158.8 ± 29.4 mL/100 mL/min vs. 274 ± 63.1 mL/100 mL/min; p = 0.014). In the metabolic assessment, the injured areas displayed increased lactate/pyruvate ratios compared with the entire ipsilateral and the contralateral kidney (0.35 ± 0.13 vs. 0.27 ± 0.1 vs. 0.25 ± 0.1; p = 0.0086). Alanine/pyruvate ratio was unaltered, and we were unable to quantify bicarbonate due to low signal.

Conclusion: MRI with hyperpolarized [1-13 C]pyruvate in a clinical setup is capable of detecting the acute, subtle, focal metabolic changes following ischemia. This may prove to be a valuable future addition to the renal MRI suite.

Keywords: MRI; acute kidney injury; hyperpolarization; ischemia.

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References

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