Inhibition of cyclooxygenase-2 in experimental severe acute pancreatitis

Inibição da Ciclo-Oxigenase-2 na pancreatite aguda grave experimental

ORIGINAL RESEARCH

Inhibition of cyclooxygenase-2 in experimental severe acute pancreatitis

Inibição da Ciclo-Oxigenase-2 na pancreatite aguda grave experimental

José Luiz Jesus de Almeida; José Jukemura; Ana Maria Mendonça Coelho; Rosely Antunes Patzina; Marcel Cerqueira César Machado; José Eduardo Monteiro da Cunha

Department of Gastroenterology, Department of Surgery and Department of Pathology - University of São Paulo, Faculty of Medicine, São Paulo, Brazil. Email: [e-mail]

ABSTRACT

BACKGROUND: The standard treatment for acute pancreatitis (AP) is still based on supportive care. The search for a new drug that could change the natural history of the disease is a continuing challenge for many researchers. The aim of this study is to evaluate the effect of a cyclooxygenase-2 (COX-2) inhibitor on experimental AP in rats.

METHODS: The animals were divided into 2 groups: Group 1 (n = 30)—animals with taurocholate-induced AP treated with parecoxib (40 mg/kg). Group 2 (n = 30)—animals with taurocholate-induced AP that received saline. The COX-2 inhibitor (parecoxib) was injected immediately after AP induction, through the penis dorsal vein. The parameters evaluated were histology, serum levels of amylase, IL-6 and IL-10, and mortality rate.

RESULTS: The serum levels of IL-6 and IL-10 in the parecoxib-treated group were lower than the control group. The amylase serum levels and the mortality rate remained unchanged in the treated animals. Histologic morphology also was unaltered, except for fat necrosis, which was higher in parecoxib-treated rats.

CONCLUSION: Inhibition of Cox-2 decreases the systemic release of inflammatory cytokines, but has a poor effect on the direct pancreas injury caused by taurocholate.

Keywords: Acute pancreatitis, COX-2 inhibition, Parecoxib, Interleukins

RESUMO

INTRODUÇÃO: O tratamento padrão para a pancreatite aguda permanece baseado em medidas de suporte. A busca por uma droga que altere a história natural da doença ainda é um desafio para muitos pesquisadores. O objetivo deste estudo é avaliar o efeito de um inibidor da COX-2 na pancreatite aguda grave experimental (PA) em ratos.

MÉTODO: Os animais foram divididos em dois Grupos: Grupo 1 (n=30) - animais com PA induzida por taurocolato e tratados com parecoxib (40mg/Kg). Grupo 2 (n=30) - animais com PA induzida por taurocolato que receberam solução salina. O inibidor de COX-2 (parecoxib) foi injetado imediatamente após a indução, através da veia dorsal do pênis. Os parâmetros avaliados foram histologia, níveis séricos de amilase, IL-6 e IL-10 e taxa de mortalidade.

RESULTADOS: Os níveis séricos de IL-6 e IL-10 foram menores do que no grupo controle. Os níveis séricos de amilase e a taxa de mortalidade permaneceram inalteradas. A análise histológica também não mostraram alterações, exceto pela necrose gordurosa, que foi maior nos animais controle.

CONCLUSÃO: A inibição da COX-2 pode reduzir a liberação sistêmica de pelo menos duas citocinas, mas tem pouco efeito na lesão pancreática direta causada pelo taurocolato.

Unitermos: Pancreatite aguda, Inibição da COX-2, Parecoxib, Interleucinas

INTRODUCTION

Acute pancreatitis (AP) is an inflammatory condition of the pancreas characterized by abdominal pain and elevated pancreatic enzymes in the blood.¹ There are several etiologies for this disturbance,² but the exact pathophysiological mechanism is still not completely understood.

The disease involves a complex cascade of events.^2–5 It starts with intracellular activation of enzymes and the subsequent lesion of acinar cells, leading to a local and systemic inflammatory response.² Activation of complement and secondary release of C5a has a significant role in the recruitment of inflammatory cells.³ Activation of these cells provokes the release of proinflammatory cytokines, metabolites of arachidonic acids, and oxygen free radicals (OFRs), which may eliminate the antioxidant defenses of the cells.⁵ These substances interact with the microcirculation, increasing vascular permeability and inducing thrombosis and hemorrhage, ultimately leading to tissue necrosis.

The cyclooxygenase (COX) enzyme (also known as PGH syntase or PG endoperoxydase) catalyzes the limiting reaction of prostaglandin E₂ production.⁶ There are at least 2 isoforms of cyclooxygenases.⁷ The isoform known as COX-1 is constitutive (present in several healthy tissues, such as the kidneys and the gastrointestinal tract). It is believed that this isoform has a pivotal role in the protection and maintenance of mucosal integrity.⁸ The isoform COX-2 is inducible, and its detection in noninflamed tissues is controversial. It also appears to play a role in the course of inflammation .⁹ The expression of COX-2 is stimulated by proinflammatory cytokines, such as TNF-alpha and IL-1; it is inhibited by anti-inflammatory mediators, such as interleukin-10 (IL-10), IL-4, and by the transforming growth factor-beta (TGF-beta).^10,11

Zabel-Langhennig et al demonstrated that COX-2 mRNA as well as its serum level are elevated in the setting of AP.¹² This elevation is more pronounced in the early stages of the inflammatory process, when the enzyme acts as a proinflammatory agent. In the late stages of the disorder, COX-2 may have anti-inflammatory properties, although this still is matter of debate.¹³

Other studies have shown the beneficial effect of previous inhibition of COX-2 or the knock-out of its gene in experimental AP.^14–17 Song et al,¹⁶ using a model of experimental cerulein-induced AP, showed that pharmacological inhibition of COX-2 before AP induction resulted in the reduction of inflammatory mediators, in diminished neutrophil recruitment, and in improvement of pulmonary and pancreatic histologic lesions. However, the efficacy of COX-2 inhibition has not yet been evaluated in a clinical setting; moreover, some reports have shown an association of administration of COX-2 inhibitor and AP.^18–21

Taking this controversy into account, the aim of this study was to determine the effect of COX-2 inhibition on experimental taurocholate-induced AP.

MATERIALS AND METHODS

Sixty male Wistar rats, provided by the Medical Investigation Laboratory #37 (LIM-37) and managed according to Guide for Care and Use of Laboratory Animals (1996) were used. The study protocol was approved by Institutional Ethics Committee for animal use in research studies. The animals were housed in a room with a temperature of 23 ± 1ºC and a 12-hour light-dark cycle. The night before the experiment, food and water was offered ad libitum.

Rats were divided into 2 groups: Group I (n = 30): rats with taurocholate-induced AP that received a single dose of parecoxib (40 mg/kg) iv through the penis dorsal vein immediately after the induction of AP; Group II (n = 30): rats with taurocholate-induced AP that received a saline injection immediately after AP induction.

AP induction

We induced acute pancreatitis according to a previously reported procedure²² (Figure 1).

Sacrifice

After a 2-hour period, 10 rats of each group were re-anesthetized and underwent a new laparotomy in order to obtain blood samples (by cardiac puncture) and pancreatic tissue. The pancreata were removed and carefully dissected, freed of all adjacent fat and lymph nodes. The animals were sacrificed by exsanguination after this process.Histologic alterations and serum levels of IL-6, IL-10, and amylase were assessed.

The remaining 20 rats of each group were watched for a 72-hour period to determine the mortality rate.

Amylase and Interleukin Serum Levels

Blood samples were immediately centrifuged at 3000 g for 10 minutes at 0ºC, and the supernatant stored at -20ºC. In all rats, amylase serum levels were assessed by Bernfeld's method²³ as modified by Jamieson et al.²⁴

Serum IL-6 and IL-10 levels were determined by enzyme-linked immunoabsorbent assay (ELISA), using BioSource International Cytoscreen^TM kits (BioSource International, Camarillo, California, USA)

Histological Evaluation

Representative tissue samples collected from the duodenal (proximal) and splenic (distal) parts of the pancreas were fixed in 10% formalin for 24 h and embedded in paraffin. Five-micrometer-thick sections were stained with hematoxylin and eosin, and the degree of tissue damage was graded in a blinded fashion by a single pathologist, using an established scoring system.²⁵Statistical Analysis

Results are reported as mean + SE. Parametric data were evaluated by the Student t test. Nonparametric data were evaluated by the Mann-Whitney U test. To compare mortality rates, the Kaplan-Meier log-rank test was employed. Significant difference was declared when P < 0.05.

RESULTS

Serum levels of IL-6 and IL-10 were lower in rats that received the COX-2 inhibitor, (Figures 2 and 3). In contrast, the ratio of IL-6 to IL-10 was unaltered.

Histologic evaluation of edema, hemorrhage, and acinar necrosis did not show any difference between the two groups, but fat necrosis was worse in the parecoxib-treated rats (Table 1).

Serum levels of amylase and mortality rates remained unaltered (Figure 4).

DISCUSSION

The standard treatment of AP is still based on supportive care ²⁶. The search for new drugs that could alter the natural history of the disease is a continuing challenge for many researchers. Several substances have been tested in some studies in an attempt to block the effects of inflammatory mediators that have an established role in the pathogenesis of AP. The tested agents include antioxidants, antiplatelet aggregating factor (anti-PAF), nonspecific COX-inhibitors, H⁺K⁺ pump inhibitors, and somatostatine-analogues.^27-31 The drawback of these studies is that, in general, the treatment was carried out before the induction of AP, and although some of these substances may have brought some benefits in experimental AP models, application in the clinical setting is limited by the impossibility of predicting the occurrence of the disease. On the other hand, in the present study, the aim was to determine whether the activity of COX-2 is relevant to the progression of the disease. Therefore, the COX-2 inhibitor parecoxib was administered immediately after the onset of AP, which also does not directly relate to the real clinical scenario. Nevertheless, this has allowed us to highlight important findings about the role of COX-2 in the pathophysiology of the disease.

COX-2 is considered a proinflammatory enzyme that is expressed in the early phases of inflammation (neutrophil-dominated phase). Much is known about the proinflammatory role of COX-2 in a variety of acute and chronic inflammatory conditions, including arthritis, inflammatory bowel disease, and asthma, but very little is known regarding its potential role in acute pancreatitis. In a study using a cerulein model of severe AP, Song et al found that mRNA levels of pancreatic COX-2 rose within 15 minutes of the start of cerulein administration and that pancreatic COX-2 protein levels were increased within 4 h of cerulein administration.¹⁶ These observations suggest that COX-2 might play an important role in regulating the severity of cerulein-induced AP. However, the mechanisms by which COX-2 might promote inflammation in taurocholate-induced AP are not immediately obvious. We considered the possibility that COX-2 might cause direct damage to epithelial ductal cells and recruit inflammatory cells to the local tissue, leading to edema and hemorrhage. Cytokine production by these inflammatory cells probably involves activation of nuclear – factor kB (NF-kB).³² The proinflammatory effects of COX-2 in experimental AP may be multifactorial and involve, among other things, alterations in heat-shock proteins (HSPs), inducible NO synthase (iNOS) expression, and neutrophil function.

In the present study, we demonstrated that parecoxib, a second generation COX-2 inhibitor, infused immediately after AP induction, diminished serum levels of IL-6 and IL-10; however, there was no decrease of serum levels of amylase or any benefit regarding pancreatic histologic damage, and the survival rate remained unaltered. Therefore, we postulate that the pancreatic lesion established in the taurocholate model of AP may be impossible to revert and, perhaps, that treatment should be directed to the prevention of the systemic damage. In an analogue study, Alhan et al¹⁷ found that celecoxib (a first-generation COX-2 inhibitor), injected i.p. 6 hours after the induction of necrotizing AP, decreased myeloperoxidase (MPO) and malondialdehyde (MDA) levels in the pancreatic tissue. These authors concluded that celecoxib has an antioxidant effect, because there is no evidence that prostaglandins contribute to acinar cell injury. In addition, serum levels of IL-6 were also found to be reduced, and no differences in mortality rate were observed. In our study, the COX-2 inhibitor was injected intravenously immediately after AP induction. The dosage we employed was 4-fold higher than previously reported by other authors^14,16 The option for such a huge dosage was purely empiric, as an attempt to maintain very low levels of COX-2.

Considering the proinflammatory action of IL-6, the reduction of its blood levels after the onset of AP, could have, in theory, beneficial effect in the evolution of the disease, even hours after induction. However, this could not be demonstrated by histologic evaluation in the present investigation. The role of IL-6 on AP is complex and controversial.³³ Multiple studies have correlated the severity of the disease with IL-6 blood levels. Some of these studies have suggested that levels of IL-6 in patients with acute pancreatitis may be predictive of disease severity.^34-36 It has also been found that IL-6 is responsible for the synthesis of acute-phase proteins.³⁷

The cytokine IL-6, is thought to be induced, at least partially, by NF-kB activation. Slogoff et al, using a cerulein model of AP, showed that IL-6 levels were elevated in mice treated with COX-2 inhibitors, despite attenuated pancreatic inflammation and a decrease in NF-kB activation.³⁸ This finding suggests that the stimulus for IL-6 secretion remained intact, despite a lower NF-kB activity; however, it did not elucidate whether IL-6 is linked to the amelioration of AP in mice. In the present report, although serum levels of IL-6 were diminished, this was not associated with any benefit regarding the pancreatic histologic damage. On the other hand, in the report by Alhan et al,¹⁷ the lower level of IL-6 correlated with a lower level of MPO and MDA in the pancreatic tissue. This discrepancy observed among the 3 studies may be due to the differences in the experimental models as well as in the study designs.

Previous studies demonstrated that the kinetics of NF-kB activation after induction of cerulein-induced pancreatitis are biphasic; NF-kB is initially activated during the first 15 minutes after cerulein administration, peaks at 30 minutes, decreases during the next hour; a second peak occurs between 3 and 6 hours.³⁹ Considering these results, it is possible that the initial peak of NF-kB remains intact after COX-2 inhibition in the cerulein model, thus resulting in IL-6 release. Nevertheless, the kinetics of NF-kB activation and IL-6 release in taurocholate-induced AP is not clear.

Improved survival has been demonstrated in an experimental model of taurocholate-induced AP in rats treated with a NF-kB inhibitor, despite a lack of attenuation of histologic severity.⁴⁰ So, it is also possible that there is no correlation between Cox-2 and the NF-kB pathway in the early events of this experimental model.

With IL-10 being an anti-inflammatory cytokine⁴² and one of the major mediators of compensatory anti-inflammatory response syndrome,⁴³ the decrease in its level after parecoxib treatment was an unexpected finding in the present study. This could explain the unchanged histologic damage and survival rate. There are some possible explanations for this result. As previously mentioned, anti-inflammatory cytokines, such as IL-10, decrease cyclooxygenase-2 expression. Because COX-2 was already inhibited by parecoxib, it is possible that its serum levels were decreased since there was no stimulus for its increase. Perhaps the main reason for a compensatory anti-inflammatory response by IL-10 is the COX-2 activity itself. Another possibility is that the increase of IL-10 is coupled with an increase in IL-6 as a mechanism to keep the inflammatory response under control. The finding that the ratio of IL-6 to IL-10 was also unchanged suggests that the two cytokines decreased in a way directly proportional. Some studies have shown that increases in IL-10 concentration also follow a biphasic pattern (in the first days and about 10 days later).⁴⁴ However, the significance of elevated serum IL-10 levels in AP is unclear, as is its connection with the COX-2 pathway.

In conclusion, the treatment with a COX-2 inhibitor might lower serum levels of at least two cytokines, but there was no amelioration of the survival rate or histologic pancreatic damage. The potential benefits of this effect are still unclear; therefore, further investigation is needed to better elucidate how COX-2 inhibition might change the natural course of AP.

Note: the authors would like to express their gratitude for Sandra Aparecida Nassa Sampietre and Nilza Aparecida Trindade Molan. We are in debt with them.

Received for publication: December, 21, 2005.

Accepted for publication: April, 12, 2006.

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Publication Dates

• Publication in this collection
  16 Aug 2006
• Date of issue
  Aug 2006

History

• Received
  21 Dec 2005
• Accepted
  12 Apr 2006