The Selective Poly(ADP)ribose-polymerase 1 Inhibitor INO1001 Reduces Spinal Cord Injury During Porcine Aortic Cross-clamping-induced Ischemia/reperfusion Injury

Overview

Journal Intensive Care Med

Specialty Critical Care

Date 2007 Mar 16

PMID 17361386

Citations 11

Authors

Christian Maier

Angelika Scheuerle

Balazs Hauser

Hubert Schelzig

Csaba Szabo

Peter Radermacher

Jochen Kick

Affiliations

Soon will be listed here.

Abstract

Objective: It is well-established that poly(ADP)ribose-polymerase (PARP) assumes major importance during ischemic brain damage, and the selective PARP-1 inhibitor PJ34 reduced spinal cord damage in murine aortic occlusion-induced ischemia/reperfusion injury. We investigated the effect of the PARP-1 inhibitor INO1001 on aortic-occlusion-related porcine spinal cord injury.

Design And Setting: Prospective, randomized, controlled experimental study in an animal laboratory.

Patients And Participants: Ten anesthetized, mechanically ventilated, and instrumented pigs.

Interventions: Animals underwent 45 min of thoracic aortic cross-clamping after receiving vehicle (n=5) or intravenous INO1001 (n=5, total dose 4 mg/kg administered both before clamping and during reperfusion). During reperfusion continuous intravenous norepinephrine was incrementally adjusted to maintain blood pressure at or above 80% of the preclamping level. Plasma INO1001 levels were analyzed by HPLC. After 4[Symbol: see text]h of reperfusion spinal cord biopsy samples were analyzed for neuronal damage (hematoxyline-eosine and Nissl staining), expression of the cyclin-dependent kinase inhibitor genes p21 and p27 (immunohistochemistry), and apoptosis (terminal deoxynucleotidyl transferase mediated nick end labeling assay).

Measurements And Results: Plasma INO1001 levels were 0.8-2.3 and 0.30-0.76 mM before and after clamping, respectively. While 3-5% of the spinal cord neurons were irreversibly damaged in the INO1001 animals, the neuronal cell injury was three times higher in the control group. Neither p21 and p27 expression nor apoptosis showed any intergroup difference.

Conclusions: The selective PARP-1 inhibitor INO1001 markedly reduced aortic occlusion-induced spinal cord injury. Given the close correlation reported in the literature between morphological damage and impaired spinal cord function, INO1001 may improve spinal cord recovery after thoracic aortic cross-clamping.

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