Chronic succinate exposure does not cause liver injury

Area of Science:

• Biochemistry
• Hepatology
• Metabolic Disorders

Background:

• Elevated circulating succinate is observed in patients with metabolic syndrome and liver dysfunction.
• Succinate is implicated in non-alcoholic fatty liver disease (NAFLD) pathogenesis through mechanisms involving succinate receptor-1 (SUCNR-1) and AMP-associated protein kinase (AMPK).
• Skeletal muscle is a significant endogenous source of succinate.

Purpose of the Study:

• To investigate the long-term effects of chronically elevated endogenous succinate on liver function and integrity.
• To determine if sustained high succinate levels, originating from skeletal muscle, induce liver injury.

Main Methods:

• Utilized a transgenic mouse model with muscle-specific ablation of succinate dehydrogenase (SDHC knockout).
• Assessed liver morphology macroscopically and histologically.
• Performed comprehensive liver function tests and analyzed serum biochemical markers.
• Measured oxygen consumption using high-resolution respirometry.

Main Results:

• Transgenic animals with elevated blood succinate showed no macroscopic or histological evidence of liver injury compared to wild-type controls.
• Liver function tests and serum biochemical markers did not indicate succinate-induced liver toxicity.
• Metabolic assessments did not reveal signs of liver dysfunction attributable to chronic succinate elevation.

Conclusions:

• Sustained, long-term endogenous elevation of blood succinate does not appear to cause conspicuous liver dysfunction.
• These findings challenge the direct causal role of chronically elevated succinate in liver injury in this model.
• Further research may be needed to elucidate the precise role of succinate in liver disease progression.