Sorbitol dehydrogenase inhibitor protects the liver from ischemia/reperfusion-induced injury via elevated glycolytic flux and enhanced sirtuin 1 activity

  • Authors:
    • Changhe Zhang
    • Xiangcheng Li
    • Qinhong Liu
  • View Affiliations

  • Published online on: October 21, 2014     https://doi.org/10.3892/mmr.2014.2715
  • Pages: 283-288
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Abstract

Sorbitol dehydrogenase (SDH), a key enzyme of the polyol pathway, has recently been demonstrated to have an important role in mediating tissue ischemia/reperfusion (I/R) injury. The present study investigated how this enzyme may affect the ischemic liver and the mechanism underlying its effect. Firstly, C57BL/6 mice were subjected to oral administration of CP‑470,711 (5 mg/kg body weight/day for five days) and 70% hepatic I/R. Next the present study further investigated the changes in liver function, histology, inflammation, apoptosis and necrosis; the cytosolic adenosine triphosphate (ATP) and nictotinamide adenine dinucleotide [NAD(H)] contents and the protein level of caspase 3 and sirtuin 1 (SIRT1). The data demonstrated that sorbitol dehydrogenase inhibitor (SDI)‑administration significantly alleviated I/R‑induced liver injury, palliated histological changes and lowered the level of hepatocyte apoptosis and necrosis. In addition, SDI‑pretreatment in ischemic liver markedly maintained the cytosolic ATP and NAD(H) proportion, enhanced SIRT1 and suppressed the activation of caspase 3 at the protein level. The findings in the present study revealed that the flux through SDH may render the liver more vulnerable to I/R-induced injury and interventions targeting this enzyme may provide a novel adjunctive approach to protect from severe tissue injury following liver ischemia.

Introduction

Ischemia-reperfusion (I/R) injury is a common occurrence in liver surgery. Patients undergoing liver transplantation may encounter severe postoperative complications, namely primary liver dysfunction or non-function despite the long waiting lists and high rate of mortality in those awaiting a compatible donor (1). In addition, patients subjected to major hepatectomy also have a high risk of developing liver dysfunction, in which portal triad occlusion is routinely utilized to reduce blood loss (2). Among the multiple pathogeneses accounting for these complications, I/R induced injury is widely accepted as an important contributor (1,2).

Sorbitol dehydrogenase (SDH), a key enzyme in the polyol pathway, has traditionally been implicated in the development of vascular and neurological complications in diabetes. In this pathway, SDH converts sorbitol to fructose with the concomitant reduction of coenzyme nictotinamide adenine dinucleotide (NAD) to NADH (3). Previously, accumulating evidence has demonstrated the beneficial impact of a sorbitol dehydrogenase inhibitor (SDI) on ischemic tissue (35). The potential mechanisms underlying this effect have not been fully elucidated. In addition the role of SDH in the ischemic liver remains unclear. Therefore, the present study aimed to investigate how SDH may affect livers subjected to I/R insult and the mechanism underling its effect.

Materials and methods

Ethical approval

The present study was approved by the Nanjing Medical University Experimental Animal Department (no. NJMU-AEARIA-4001-20120401; Nanjing, Jiangsu, China) and closely followed the Guide for the Care and Use of Laboratory Animals published by the US National Institutes of Health (NIH publication no. 85-23, revised 1996).

Reagents

SDI (CP-470, 711) was obtained from Pfizer Global Research and Development (Groton, CT, USA). The NAD(H) and adenosine triphosphate (ATP) Quantification kits were purchased from BioVision (Milpitas, CA, USA). The Annexin V-fluorescein isothiocyanate (FITC)/propidium iodide (PI) apoptosis detection kit was purchased from BD Biosciences (Bedford, MA, USA). Interleukin (IL)-1β (catalogue no. MLB00C) and tumor necrosis factor (TNF)-α ELISA assay kits (catalogue no. DY410-05) were obtained from R&D Systems (Minneapolis, MN, USA). Primary monoclonal rabbit anti-caspase 3 and secondary monoclonal mouse anti-rabbit antibodies were purchased from Cell Signaling Technology, Inc. (Danvers, MA, USA). Primary monoclonal rabbit antibodies against SDH, SIRT1 and β-actin were purchased from Abcam (Cambridge, MA, USA). The bicinchoninic acid (BCA) protein assay kit were purchased from the Beyotime Institute of Biotechnology (Nanjing, China).

Animals and I/R protocol

Wild-type C57BL/6 male mice were obtained from the Chinese Academy of Sciences (Shanghai, China), maintained in 25±2°C under a 12 h dark/light cycle. The mice were randomized into three groups containing ten animals each: (i) The SDI group, administered CP-470,711 (5 mg/kg body weight/day) by gavage for five days and subjected to 70% liver I/R; (ii) the control group, treated with isoquant saline control and subjected to 70% liver I/R; (iii) the sham group received isoquant CP-470,711 by gavage and sham operation. The usage of CP-470,711 was determined with reference to previous studies (6,7). A total of 24 h following the last drug treatment, 50% of the animals from each group underwent 1 h of 70% hepatic ischemia as previously described (8) and ischemic liver lobes were harvested to examine the real-time intrahepatic energy status. The other five mice from each group were subjected to an additional 24 h of reperfusion to detect hepatic tissue impairment and changes in protein levels. The blood samples from mice that had undergone I/R were collected to investigate the levels of inflammatory markers. The animals were eventually sacrificed under deep anesthesia induced by peritoneal chlorali hydras (0.6 g/kg body weight).

Liver function test

The blood samples were immediately centrifuged at 2,000 × g to obtain serum following collection. The serum alanine aminotransferase (ALT) and aspartate aminotransferase (AST) were then automatically measured on the Aeroset autoanalyzer (Abbott Laboratories, Chicago, IL, USA) and reported in units per liter.

Detecting serum inflammatory markers

The serum levels of IL-1β and TNF-α were investigated in a 96-well microtitre plate using a commercial enzyme-linked immunosorbent assay kit according to the manufacturer’s instructions. The lower limits of IL-1β and TNF-α detection were 2.31 and 1.88 pg/ml, respectively.

Morphological observations

The histological sections stained with hematoxylin and eosin (H&E) were processed routinely. The degree of hepatic necrosis and inflammation was evaluated by an experienced pathologist using the Suzuki score, which evaluated the extent of congestion, vacuolization and necrosis on a four-point scale for a total score of 0–12 as previously described (9).

Flow cytometric analysis of the proportion of hepatocytes undergoing necrosis and apoptosis

Single-hepatocyte suspensions were prepared from the fresh liver using an enzymatic technique as previously described (10). Cells were exposed to 0.04% Trypan blue for 3 minutes and then observed under a light microscope. Trypan Blue exclusion demonstrated that the cell viability in all of the samples exceeded 89%. The degree of apoptosis and necrosis in the hepatocytes was quantified by flow cytometry using an Annexin V-FITC kit and FlowJo software (Tree Star Inc., Ashland, OR, USA) as previously described (11). The cell percentage in the upper right, upper left and lower right quadrants represented the proportions of late apoptotic, necrotic and early apoptotic cells, respectively. The total apoptosis ratio was then calculated by addingthe proportions of late and early apoptotic cells.

Measuring cytosolic ATP and NAD(H) contents

The hepatic contents of NAD(H) and the NAD/NADH ratio were determined using NAD+/NADH Quantification Kit (BioVision). Briefly, the liver samples were homogenized in extraction buffer and centrifuged at 12,000 × g for 5 min. The supernatant was filtered through 10-kDa Spin Columns (Catalogue no. 1997-25; BioVision) to remove the NADH-consuming enzyme NADase and was then measured according to the manufacturer’s instructions.

The ATP content in the hepatocytes was detected by a colorimetric method using a ATP Colorimetric/Fluorometric Assay kit (BioVision), which consumes ATP to generate glycerol 3-phosphate, according to the manufacturer’s instructions. To remove the innate ATP-consuming enzymes, the homogenized samples (10 mg) were filtered through the aforementioned spin column prior to being inoculated into 96-well plates. Measurements were performed according to the manufacturer’s instructions.

Immunoblotting assay

Total protein from the liver tissues following I/R insult were analyzed by immunoblotting as previously described (12). Prior to sample-loading, the BCA Protein Assay kit was conventionally used to determine the homogeneity of protein concentrations in different columns. The primary antibodies were used at the following concentrations: Anti-SDH (1:1,500), -caspase-3 (1:2,000), -SIRT1 (1:2,000) and -β-actin (1:2,500). The relative protein levels were determined using Image J software (NIH, Bethesda, MD, USA). β-actin served as a reference protein

Statistical analysis

Data are expressed as the mean ± standard deviation. Statistical analysis of the data was performed using the Duncan’s test with SPSS 16.0 software (SPSS, Inc., Chicago, IL, USA). P<0.05 was considered to indicate a statistically significant difference. All of the results were obtained from at least five independent experiments.

Results

SDI protects mouse liver against I/R-induced impairment

The transaminases ALT and AST are generated innately within hepatocytes and marked elevations in serum levels denote hepatocellular membrane leakage caused by inflammation and/or necrosis. In the present study, I/R markedly increased the serum transaminase levels, whereas SDI-pretreatment markedly ameliorated these changes (Fig. 1A).

IL-1β and TNF-α are widely accepted to be inflammatory markers and an increase in the serum level indicates a severe inflammatory reaction and tissue injury (13). As demonstrated in Fig. 1B, SDI administration markedly alleviated the I/R-mediated elevation in the serum level of IL-1β and TNF-α as compared with the control group.

SDI-pretreatment prevents the I/R-induced histological changes and improves hepatocyte fate

As direct causes of liver dysfunction following I/R, hepatic inflammation, apoptosis and necrosis were analyzed in the present study. As demonstrated in Fig. 2A, I/R insult significantly disrupted liver histology and contributed to significant necrosis in contrast to the sham group, where SDI markedly prevented the changes in hepatic histology. Consistently, the quantitative Suzuki score in the control group was also evidently higher than that in sham group and this trend was significantly mitigated by SDI treatment (Fig. 2B). In the flow cytometric analysis, the proportions of apoptotic and necrotic hepatocytes in the control group were higher than the sham group, while SDI significantly reverted these changes (Fig. 2C and D).

SDI reverses the I/R-mediated NAD/NADH imbalance and energy deficit

The coenzyme NAD(H) participates in the polyol and glycolysis pathways, the latter of which acts as a major ATP source in the ischemic liver (3,14,15). Therefore, the present study analyzed the NAD(H) and ATP content in the ischemic liver, intending to examine the possible causal association between SDI-administration, NAD(H) and ATP content. As demonstrated in Fig. 3A–C, SDI significantly alleviated the I/R-induced decrease in NAD and ATP content and reversed the NAD/NADH imbalance compared with the control group.

SDI enhances SIRT1 protein expression and inhibits caspase 3 in the liver following I/R

As an important cellular function regulator and an NAD-dependent enzyme, SIRT1 deacetylase was quantified by an immunoblotting assay (16). As demonstrated in Fig. 4A and B, I/R markedly suppressed SIRT1 at the protein level while SDI alleviated this change.

It is well-established that caspase 3 acts as a major and common executor in multiple apoptotic pathways when cells are exposed to cytotoxic stressors, including I/R (17,18). The level of cleaved caspase 3 was then measured using western blotting. As demonstrated in Fig. 4A and B, SDI markedly suppressed the I/R-induced activation of protein caspase 3 as compared with the control group.

Additionally, SDH protein was also quantified to assess the inhibition efficiency of SDI. In the present study, the sham and control groups exhibited a similar level of SDH protein, which was notably higher than that in the SDI group (Fig. 4A and B).

Discussion

In the present study, it was firstly demonstrated that SDI markedly alleviated liver I/R-induced impairment and improved hepatocyte fate. These findings are consistent with those of previous studies investigating other target organs (35). The changes in NAD(H) content and proportion were markedly ameliorated following SDI administration, providing evidence that these beneficial effects may be associated with the improved co-enzyme balance and resultant cellular metabolic and signaling adaptations.

Under hypoxic conditions, low levels of ATP are generated within the liver by glycolysis to sustain basic cellular function (14,15,19). In the glycolysis pathway, the key enzyme GAPDH exerts a catalytic function dependent upon the synchronous reduction of NAD to NADH, which denotes a competitive antagonistic correlation between SDH and GAPDH due to the limited quantity of NAD (20,21). Therefore, it is reasonable to hypothesize that inhibiting SDH may prevent this competition for substrate and enhance the glycolysis flux. This hypothesis has been widely validated by previous studies based on models of ischemic heart, brain and kidney injury. In these studies, the reduction in the levels of NAD and/or the NAD/NADH ratio was caused by niacin deficiency or poly (ADP-ribose) polymerase overactivation, which clearly aggravated tissue I/R injury. The ARI/SDI pretreatment or NAD/niacin repletion markedly reversed this phenomenon (35,2225). In the present study, pretreating ischemic mice with SDI also contributed to an evident elevation in the NAD/NADH ratio and ATP content. These results were consistent with the findings of previous studies (3,4,2224).

Hepatocyte inflammation, apoptosis and necrosis represent different extremes in a continuum of cellular responses to severe stressors (17,18). The major difference between them is that inflammation refers mainly to the reaction of cells to stimuli, while apoptosis and necrosis are cell death processes. However, apoptosis is an active, ATP-consuming event, while necrosis is passive, without ATP participation (13,18). In the present study, intracellular ATP content was significantly increased following SDI administration. This may explain why histology and flow cytometry in the SDI group primarily demonstrated inflammation and apoptosis, whereas the control group demonstrated evidence of apoptosis and necrosis.

Aside from GAPDH, SIRT1 deacetylase represents another NAD-dependent enzyme. SIRT1 is a member of the mammalian sirtuin family and widely participates in cellular death modulating activities, including mitochondrial function, poly (ADP-ribose) polymerase-1 (PARP-1) cytotoxicity and apoptotic effects (20,22,2629). Therefore, due to its roles in delaying aging and anti-apoptosis, SIRT1 is generally acknowledged to be a lifespan promoter, preventing cell death. In the present study, SIRT1 protein expression was suppressed by I/R injury, while SDI notably inhibited this trend. Limited by the scale of the study, the specific role of SIRT1 in the ischemic liver was not investigated. However, it is hypothesized that the elevated SIRT1 flux may contribute to reduced I/R-induced liver injury.

Accumulating evidence has suggested that NAD is a fundamental mediator of various biological processes (20). Apart from the aforementioned regulative activities, an appropriate proportion of NAD(H) is required to maintain mitochondrial function and cellular calcium homeostasis (3,20,3032). Furthermore, NAD also has a pivotal role in activating the PARP-1-dependent death pathway (22,25,33). Therefore, a paradoxical theme emerges: The SDI-induced NAD elevation may protect the ischemic liver through improved glycolysis and/or SIRT1 activities; conversely, increased cytosolic NAD content may contribute to elevated PARP-1-mediated hepatocyte apoptosis. Considering the variance in liver function, histology and hepatocyte fate, it was hypothesized that SDI predominantly exhibits a beneficial role in hepatic I/R injury. However, for potential clinical consideration, further, more comprehensive studies are required.

In conclusion, the present study demonstrated that SDI protects the liver against I/R-induced injury in terms of improved liver function, ameliorated histopathological changes and reduced levels of hepatic necrosis and apoptosis. This effect may be further associated with an elevated NAD/NADH ratio and resultant elevation in glycolysis flux and SIRT1 expression. The present study suggests that SDI may be used clinically to protect the liver from severe tissue impairment following I/R injury.

Acknowledgements

The present was fully financed by the National Natural Science Foundation of China (grant no. 81170415).

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Spandidos Publications style
Zhang C, Li X and Liu Q: Sorbitol dehydrogenase inhibitor protects the liver from ischemia/reperfusion-induced injury via elevated glycolytic flux and enhanced sirtuin 1 activity. Mol Med Rep 11: 283-288, 2015.
APA
Zhang, C., Li, X., & Liu, Q. (2015). Sorbitol dehydrogenase inhibitor protects the liver from ischemia/reperfusion-induced injury via elevated glycolytic flux and enhanced sirtuin 1 activity. Molecular Medicine Reports, 11, 283-288. https://doi.org/10.3892/mmr.2014.2715
MLA
Zhang, C., Li, X., Liu, Q."Sorbitol dehydrogenase inhibitor protects the liver from ischemia/reperfusion-induced injury via elevated glycolytic flux and enhanced sirtuin 1 activity". Molecular Medicine Reports 11.1 (2015): 283-288.
Chicago
Zhang, C., Li, X., Liu, Q."Sorbitol dehydrogenase inhibitor protects the liver from ischemia/reperfusion-induced injury via elevated glycolytic flux and enhanced sirtuin 1 activity". Molecular Medicine Reports 11, no. 1 (2015): 283-288. https://doi.org/10.3892/mmr.2014.2715