Ringer's lactate improves liver recovery in a murine model of acetaminophen toxicity
© Yang et al; licensee BioMed Central Ltd. 2011
Received: 4 January 2011
Accepted: 15 November 2011
Published: 15 November 2011
Acetaminophen (APAP) overdose induces massive hepatocyte necrosis. Liver regeneration is a vital process for survival after a toxic insult. Since hepatocytes are mostly in a quiescent state (G0), the regeneration process requires the priming of hepatocytes by cytokines such as TNF-α and IL-6. Ringer's lactate solution (RLS) has been shown to increase serum TNF-α and IL-6 in patients and experimental animals; in addition, RLS also provides lactate, which can be used as an alternative metabolic fuel to meet the higher energy demand by liver regeneration. Therefore, we tested whether RLS therapy improves liver recovery after APAP overdose.
C57BL/6 male mice were intraperitoneally injected with a single dose of APAP (300 mg/kg dissolved in 1 mL sterile saline). Following 2 hrs of APAP challenge, the mice were given 1 mL RLS or Saline treatment every 12 hours for a total of 72 hours.
72 hrs after APAP challenge, compared to saline-treated group, RLS treatment significantly lowered serum transaminases (ALT/AST) and improved liver recovery seen in histopathology. This beneficial effect was associated with increased hepatic tissue TNF-α concentration, enhanced hepatic NF-κB DNA binding and increased expression of cell cycle protein cyclin D1, three important factors in liver regeneration.
RLS improves liver recovery from APAP hepatotoxicity.
Acetaminophen toxicity is the leading cause of drug-induced acute liver failure (ALF) in the US and Europe ; however the underlying mechanisms of APAP-induced acute liver injury (ALI) are still not clear. The toxic response to APAP is triggered by a highly reactive metabolite, N-acetyl-p-benzoquinone imine (NAPQI), which reacts with and depletes glutathione (GSH), after which, it forms covalent adducts and initiates mitochondrial oxidative stress [2, 3]. This increases the membrane permeability transition and causes the collapse of the mitochondrial membrane potential, which resultantly diminishes the mitochondrial capacity to synthesize ATP , and ATP depletion leads to massive necrosis of the hepatocyte, a characteristic feature of APAP hepatotoxicity .
Liver regeneration is a vital process for survival after a toxic insult [6, 7]. Regeneration ensures the replacement of necrotic cells and the full recovery of organ function. Since hepatocytes are mostly in a quiescent state (G0), the regeneration process requires entry into the highly regulated cell cycle . The first step of this process is the priming of hepatocytes by cytokines such as TNF-α and IL-6 [9, 10], which makes cells more responsive to growth factors . The exposure to growth factors such as hepatocyte growth factor results in the expression of cell cycle proteins . The induction of cyclin D1 is the most reliable marker for cell cycle (G 1 phase) progression in hepatocytes . Once hepatocytes express cyclin D1, they have passed the G1 restriction point and are committed to DNA replication .
Many factors can influence liver regeneration. TNF-α and IL-6 are important pro-regenerative cytokines, which can prime hepatocytes to facilitate liver regeneration . IL-8 and MIP-2, the CXC (CXC motif, the two N-terminal cysteines of CXC chemokines are separated by one amino acid, represented in this name with an "X") pro-inflammatory cytokines, are able to enhance hepatocyte regeneration in acute liver injury induced by APAP even when the treatment is delayed . Currently, NF- κB is thought to play a major role in the initiation of liver regeneration after cell or tissue loss (such as by hepatotectomy) . In addition, nutrients and metabolic status can also influence regeneration, because APAP induces massive hepatocytes necrosis. After the loss of a large number of parenchymal cells, the metabolic work of surviving hepatocytes is increased and more ATP is needed for maintaining homeostasis and regeneration .
Ringer's lactate solution (RLS), a frequently used resuscitative fluid, has been shown to increase serum IL-6, IL-8 [12, 13] and TNF-α [13, 14] in patients and experimental animals; in addition, RLS can provide lactate as an alternative metabolic fuel [15–21]. "Lactic acid" was thought to be responsible for tissue damage, and as a consequence, lactate is frequently considered to be a "toxic" compound. These concepts are now being reexamined as metabolic evidence has emerged in favor of lactate reassessment [22, 23]. Lactate provides a satisfactory alternative to glucose as the primary energy in brain tissue during recovery from hypoxia [24, 25], and lactate infusion can improve the recovery of neuron damage following brain injury . Moreover, lactate improves cardiac efficiency during shock, and it has recently been shown that lactate deprivation during shock impairs heart metabolism . Such evidence indicates that lactate can be used as an energy substrate and resuscitative fluid to improve liver recovery from APAP-induced hepatotoxicity.
Based on this information, we hypothesize that RLS might improve liver recovery in ALI induced by APAP. To evaluate this idea, ALI was induced in mice by APAP i.p. injection, and the mice were observed over a 72-h period.
All chemicals were purchased from Sigma-Aldrich Chemical Co. (St. Louis, MO, USA) unless otherwise noted.
This research protocol complied with the regulations regarding the care and use of experimental animals published by the National Institutes of Health and was approved by the Institutional Animal Use and Care Committee of the University of Pittsburgh Medical School (Ref: 0609054A). Male C57BL/6 mice weighing 20-25 g (Jackson Laboratories, Bar Harbor, ME) were used and maintained at the University of Pittsburgh Animal Research Center with a 12-hour light-dark cycle and free access to standard laboratory food and water. The animals were fasted over night prior to the experiments.
In the first pilot experiment, 9 mice were intraperitoneally (i.p.) injected with a single dose of APAP (300 mg/kg dissolved in 1 mL sterile saline) and randomized into the RLS group (n = 3), the saline group (n = 3) and the APAP alone group (n = 3). 3 mice injected with saline not containing APAP served as a control group. Following 2 hrs of APAP challenge, each group was empirically given the following treatments every 12 hours for a total of 72 hrs: 0.6 mL RLS for the RLS group, 0.6 mL saline for the Saline group and 0.6 mL saline for the control group (without APAP challenge), no further treatment for APAP alone group. 72 hrs after APAP administration, RLS-treated mice demonstrated significantly lower serum AST than the saline treatment; the saline group had the similar levels of serum ALT/AST as compared with the APAP alone group, suggesting that saline therapy does not have therapeutic effect on APAP-induced ALI. Since no side effect was observed in the RLS group and serum ALT was not markedly reduced by RLS therapy (with a dosage of 0.6 mL), we increased RLS dose from 0.6 mL to 1 mL in the following experiments.
In the second pilot experiment, ALI was induced by a single dose of APAP (300 mg/kg dissolved in 1 mL sterile saline) administered by intraperitoneal (i.p.) injection. APAP challenged mice were then randomized into the RLS (n = 5) group and the Saline group (n = 5). 5 mice injected with saline not containing APAP served as a control group. 2 hrs after APAP administration, each group was given the following treatments every 12 hours for a total of 48 hrs: 1 mL RLS for the RLS group, 1 mL saline for the Saline group and 1 mL saline for the control group (without APAP challenge). 48 hrs after APAP challenge, compared to the saline therapy, RLS treatment statistically decreased serum AST (p < 0.05), however, RLS therapy did not statistically reduce serum ALT concentrations (p > 0.05), therefore, we extended the treatment from 48 h to 72 h in the following experiments.
In the first experiment, ALI was induced by a single dose of APAP (300 mg/kg dissolved in 1 mL sterile saline) administered by i.p. injection. APAP challenged mice were then randomized into the RLS (n = 7) group and the Saline group (n = 7). 6 mice injected with saline not containing APAP served as a control group. 2 hrs after APAP administration, each group was given the following treatments every 12 hours for a total of 72 hrs: 1 mL RLS for the RLS group, 1 mL saline for the Saline group and 1 mL saline for the control group (without APAP challenge). 72 hours after APAP injection, all surviving mice (1 mouse died in each of RLS and Saline groups) in each group were anesthetized with sodium pentobarbital (90 mg/kg i.p.), and the following procedures were performed: 1) blood was aspirated from the heart for the subsequent measurements of aspartate aminotransferase (AST) and alanine aminotransferase (ALT); 2) left lobe of liver was harvested for pathology (HE staining); 3) right lobe of liver was harvested and frozen for following measurements: hepatic NF-κB DNA binding by EMSA; hepatic tissue cyclin D1 expression by Western blot.
In the second experiment, separate 3 groups of mice were treated the same as above except the treatment period was 24 hrs (n = 6 for each group).
Serum aminotransferase measurements
Serum levels of AST and ALT were measured at 37°C with a commercially available kit (Sigma Diagnostic).
Consecutive sections (5 μm) from paraffin-embedded liver were prepared for hematoxylin-eosin staining. The percent of necrosis was estimated by evaluating the number of microscopic fields with necrosis compared with the entire cross section. In general, necrosis was estimated at low power (x100); questionable areas were evaluated at higher magnification (x200 or x400). The pathologist evaluated all histological sections in a blinded fashion. Inflammatory cell infiltration results were scored semi-quantitatively by averaging the number of inflammatory cells per microscopic field at a magnification of 200×. Five fields were evaluated per tissue sample, and six animals in each group were examined.
Hepatic tissue TNF-α and IL-6 concentrations
To prepare protein extract, we homogenized murine tissue samples with T-PER (Pierce, Rockford, IL), using a 1: 20 ratio of tissue-to-sample preparation reagent, as directed by the manufacturer's instruction. The samples were centrifuged at 10,000 g for 5 min to pellet tissue debris. The supernatant was collected and frozen at -80°C. Protein concentration was determined using a commercially available Bradford assay (Bio-Rad, Hercules, CA). The supernatant was assayed for TNF-α and IL-6 using ELISA kits from R&D Systems (Minneapolis, MN, USA) according to the manufacturer's instructions. The levels were expressed as pg per mg of protein.
Serum TNF-α and IL-6 concentrations
Blood (1000 μL) was obtained by cardiac puncture and the serum was collected and stored frozen at -80°C until assayed for IL-6 and TNF-α using ELISA kits from R&D Systems (Minneapolis, MN, USA) according to the manufacturer's instructions.
Neutrophils infiltration was measured at 72 hours by determining myeloperoxidase (MPO) activity in liver tissue homogenates as previously described  and was used as an index of neutrophils infiltration in all groups. The MPO levels were expressed as units per gram of tissue (U/g)
NF-κB activation was determined by EMSA, as previously described . The gels were dried and exposed to Biomax film (Kodak, Rochester, NY) at -70°C overnight with use of an intensifying screen. Bands were scanned at a NucleoVision imaging workstation and quantified with GelExpert release 3.5. Data expressed as Mean ± SEM (n = 6 per condition).
Liver protein was extracted as previously described . Equivalent amounts of protein were boiled in sample buffer and separated on 7.5% pre-cast SDS-polyacrylamide gels (Bio-Rad) and transferred to nylon membranes. Membranes were then probed with a specific antibody against cyclin D1 (Cell signaling Technology, Lexington, KY) protein, visualized with an Enhanced Chemiluminescence substrate (ECL, Amersham Pharmacia Biotech) and exposed to X-ray film according to the manufacturer's instructions.
Proliferating cell nuclear antigen (PCNA) staining
Sections from mouse liver following APAP challenge were prepared and processed for immunohistochemistry using PCNA staining kits from Invitrogen (Camarillo, CA, USA) according to the manufacturer's instructions.
Results are presented as means ± SEM. Continuous data were analyzed using student's t-test or analysis of variance followed by Fisher's LSD test. P values < 0.05 were considered significant. Summary statistics are presented for densitometry results from studies using western blot for cyclin D1 expression but these results were not subjected to statistical analysis since the method employed was only semi-quantitative (n = 6).
Serum ALT/AST at 24 h, 48 h and 72 h time points
Hepatic tissue TNF-α and IL-6
TNF-α and IL-6 are important pro-regenerative cytokines, which can prime hepatocytes at early time point to facilitate liver regeneration, therefore, 24 h time point hepatic tissue TNF-α and IL-6 concentrations were measured. 24 hrs after APAP injection, liver tissue TNF-α levels in the control group and the saline group were undetectable, hepatic tissue TNF- α concentration in the RLS group was 102.2 ± 14 pg/1 mg protein (n = 6). Hepatic tissue IL-6 concentration in the control group was 1800 ± 325 pg/1 mg protein, and this level was not significantly changed in the RLS group or the Saline group (p > 0.05).
Serum TNF-α and IL-6 concentrations
Hepatic tissue MPO level
Tissue MPO activity was determined as an index of neutrophils infiltration after APAP injection in liver. Liver MPO activity values for the control group were 4.2 ± 0.22 U/g.
Hepatic NF-κB DNA binding
Hepatic cyclin D1 expression
Hepatic PCNA expression
The purpose of this study was to test the hypothesis that RLS treatment improves liver recovery in ALI induced by APAP. The major and the novel findings of this investigation are: (a) RLS-treated mice demonstrate decreased serum ALT and AST and improved liver recovery 72 hrs after APAP administration; (b) the beneficial effect is associated with an augmented NF-κB DNA binding; and (c) RLS-treated mice demonstrate significantly increased expression of cell cycle protein cyclin D1 in liver tissue.
In this study, after RLS treatment, hepatic inflammatory cell infiltration was not reduced as seen in histopathology; neutrophils infiltration was not decreased by measuring MPO activity in total liver extracts. These data indicate that improved liver recovery by RLS therapy is not via changing hepatic inflammatory cells infiltration.
To elucidate the molecular basis of liver recovery in RLS-treated mice, we investigated its effect on the NF-κB signaling pathway because activation of NF-κB is linked strongly not only to the inflammatory response , but also to liver regeneration . In addition, NF- κB is currently thought to play a major role in the initiation of liver regeneration after cell or tissue loss (such as partial hepatectomy) [8, 10]. NF- κB activation also induces increased expression of survival genes, including BCLXL and A1 . Our data suggested that RLS treatment is associated with a beneficial response characterized by activation of NF-κB. Although NF-κB activation modulates inflammation , it is also known to protect hepatocytes from cell death, and inhibition of NF-κB after partial hepatectomy results in massive hepatocyte apoptosis, worsens liver injury and decreases survival . Enhanced NF-κB activation is also seen in mice that are protected from hepatic I/R following blockade of the receptor for advanced glycation end products . There is evidence suggesting that the impact of APAP toxicity ensues, at least in part, by dramatic modulation of inflammatory and/or regeneration programs . It is possible that in RLS treated mice subjected to APAP overdose, enhanced NF-κB activation diverts intracellular pathways from those associated with inflammation and cell death to mechanisms linked to recruitment and activation of pro-regenerative programs, therefore, activation of NF-κB by RLS treatment might facilitate regeneration in this ALI induced by APAP.
Massive hepatocyte necrosis is the predominant feature of APAP-induced acute liver injury. Tissue repair is an important determinant of final outcome of toxicant-induced injury , and cyclin D1 is an important cell cycle protein. In current investigation, our western blot data showed that RLS treatment markedly increased the level of cyclin D1 in the APAP challenged liver tissue. The change in cyclin D1 expression was associated with decreased serum AST and improved liver regeneration in RLS -treated mice receiving APAP, suggesting that RLS therapy likely facilitates cyclin D1-mediated regeneration pathway, and the increased cyclin D1 expression might be modulated by enhanced NF-κB DNA binding .
RLS-treated mice demonstrated lower serum ALT/AST and improved liver recovery at the 72 h time point. This could be due to the increased pro-regenerative cytokine TNF-α, at an early time point by RLS therapy and increased TNF-α, might prime hepatocytes for regeneration. RLS therapy also provides lactate as an alternative metabolic fuel [16–21] to meet the increased energy demand for regeneration after the massive necrosis induced by APAP. Taken together, the increase in pro-regenerative cytokine and in fuel supply might hasten the process of liver recovery from APAP overdose.
In this study, the number of PCNA positive cells was large, and the vast majority of PCNA positive cells were inflammatory cells, this is different from the other studies which have shown hepatocytes at bordering area of necrosis express PCNA during injury progression [37, 38]. There are two possibilities for this phenomenon: (1) The specificity and the sensitivity of the first antibody to PCNA might markedly influence the results, because the other two studies used monoclonal antibody to PCNA from DakoCytomation (Carpinteria, CA, USA) and Abcam, (Cambridge, MA), our PCNA staining kit was purchased from Invitrogen (Camarillo, CA, USA). (2) Animal species might also influence the results, because 24 hrs after APAP administration, PCNA expression was apparent in B6C3F1 mice  and B6J129 SVF2 mice , however, PCNA staining was negative or occasional in C57/BL6 mice in our study at 24 h time point, and our result was consistent with another study  in which BrdU (5-bromo-2-deoxyuridine) immunohistochemistry was performed to detect hepatocyte regeneration in C57/BL6 mice.
Currently NAC, a glutathione precursor, is the antidote for APAP overdose . However, this antidotal therapy is effective for early-presenting patients, and is less effective for late-presenting patients [39, 40], additional therapies are needed. Treatment with RLS would serve as an adjuvant to NAC therapy. Further experiments designed to compare the two therapies are needed in the future.
Since RLS treatment is able to improve liver recovery from APAP overdose in which massive necrosis of the hepatocyte is a characteristic feature, it is possible that RLS therapy may improve hepatic regeneration following liver surgery (such as partial hepatectomy). Further study is needed to confirm this idea in the future.
RLS treatment improves liver recovery after APAP overdose and RLS may present a novel therapy to treat APAP hepatotoxicity.
acute liver injury
ringer's lactate solution
nuclear factor κB
receptor for advanced glycation end products
electrophoretic mobility shift assays
This study was partly supported by funding from the Department of Critical Care Medicine, University of Pittsburgh and Finnish Sigrid juselius Foundation.
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