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Efecto de montelukast en un modelo de artritis gotosa inducido por cristales de monourato de sodio.

The effect of montelukast in a model of gouty arthritis induced by sodium monourate crystals Invest Clin 2011; 52(1): 15-22

INTRODUCTION

Gouty arthritis (GA) is a rheumatic condition characterized by hyperuricemia and sodium monourate crystal (SMU) deposits in one or some peripheral joints (1, 2). Once SMU crystals are deposited, joint tissues are colonized by neutrophils, monocytes/macrophages, platelets, and mast cells (3, 4). Recruitment and activation of neutrophils by SMU play a critical role in the pathogenesis and perpetuation of the acute gout (5).

Inflammatory cells secrete proinflammatory mediators and chemotactic agents such as leukotrienes (LT), tumoral necrosis factor (TNF), complement factor C5a, and interleukin 8 (IL-8) (3, 4, 6). Leukotrienes may be very relevant in this pathology, since LTB4 is the most potent chemotactic agent for neutrophils both, in vitro and in vivo (7). Consequently transendothelial migration occurs and more neutrophils colonize synovial tissues (8, 9). Non steroidal antinflammatory drugs (NSAIDS) are the first line therapy for this disease. Colchicine and steroids, local or systemic, are also used. This therapy is partially effective, but can induce adverse reactions and/or toxicity in aproximately 80% of patients. The mechanism of action involves inhibition of the cyclooxygenase enzyme, and blockade of the synthesis of prostaglandins (PG), but they have no effect in the lipooxygenase enzyme activity, responsible for the synthesis of LTs (10, 11), which are the most important inflammatory mediators in gouty arthritis (10). In inflammatory pathologies, such as bronchial asthma (12, 13) and allergic rhinitis (13, 14), in which LTs are known to play an essential role, different selective antagonists of cysteinyl LTs are shown to have a beneficial effect.

Since LTs are important inflammatory mediators in gouty arthritis (15 Rae) and drugs such as montelukast (Mk) act as a competitive inhibitor of LTs by joining selectively to LT receptors (16), especially to the LTD4 receptor, we sought to investigate the effect of montelukast in a model of experimental arthritis induced by SMU crystals deposits in the air pouch model in BALB/c mice (17).

METHODS

Animals

One hundred and five male BALB/c mice, 10 weeks old, on a regular diet, ad libitum, under strict conditions of hygiene and temperature (25-26 [degrees]C) were chosen for the experimental protocol. Surgical procedures and animal treatments were conducted in accordance with the Guide for the Care and Use of Laboratory Animals (FONACIT).

Experimental protocol

BALB/c mice were treated to produce an air pouch on their backs, by applying a subcutaneous injection of 5 mL of sterile air on day one, and 3 mL 3 days later (17). Thereafter, mice were distributed in five experimental groups (15 each) and two control groups (15 each). The experimental groups were designated as A, B, G, D, E, a positive control group for inflammation (F) and a negative control group (G). All the experimental groups received Mk and/or indomethacine (Indo), orally as follows: Mk 0.01 mg/Kg/w and 1 mg/Kg/w group A and group B respectively; Indo 2.5 mg/Kg/w group G; groups D and E received both drugs at same doses. Groups F and G received, buffer phosphate saline (PBS, Dako) orally, as control. One hour later, groups A-F were injected in the air pouch with 2 mL of SMU (5 mg/mL) prepared in PBS according to the Denko method (18). Group G received only PBS pH 7.2. Each animal group received an overdose of ether and was then sacrificed at 2, 6, 12 and 24 hours, to obtain samples for its analysis.

Sample collection and processing

The air pouch was washed with 2 mL PBS pH 7.2, plus 20 units of sodium heparine (Lilly[R]). Samples from all groups were obtained at 2 (n = 3), 6 (n = 4), 12 (n = 4) and 24 (n = 4) hours, and centrifuged at 1.200 rpm, at 25[degrees]C, for 5 minutes. The pellet was resuspended in 1 mL of PBS. Total and differential cellular counts were done using hematoxiline/eosine in a Neubauer chamber, with an optical microscope (400X).

Statistical analysis

Data are expressed as mean [+ or -] 2 SD (n = 4) and the Student's test was used to analyze the results. A P value of less than 0.05 was considered statistically significant.

RESULTS

Effect of Mk on the inflammatory exudate induced by SMU in the air pouch of experimental mice

The total cell number in the inflammatory exudates of SMU-treated mice progressively increased, reaching a value of 1,264,583 [+ or -] 434,771 cell/mL after 2 hours and a peak of 6,071,250 [+ or -] 1,043,857 cell/mL at 12 hours, followed by a decline to 3,795,000 [+ or -] 1,724,824 cell/mL at 24 hours. In the negative inflammatory control (-) the total cell number reached a peak of 200 [+ or -] 50 cel/mL. At doses of 0.01 and 1 mg/Kg/w, Mk significantly decreased the total cell number in inflammatory exudates (p < 0.05). When comparing both doses of Mk, it was found that Mk 1mg/Kg/w had a significantly greater effect than 0.01 mg/Kg/w, but only at 24 hours (Fig. 1). This reduction reached 46.5% and 47.8% at 2 hours; 78% and 69% at 6 hours; 82.1% and 86.9% at 12 hours and 73.1% and 87.5% at 24 hours, respectively. At the dose of 2.5 mg/Kg/w, Indo significantly decreased the total cell count at all times tested (p < 0.05) (Fig. 2). The inhibitory effect was 61.6% at 2 hours, 86.4 % at 6 hours, 87.4% at 12 hours and 86.7% at 24 hours (data not shown).

The combination of Mk (0.01 mg/Kg/w) plus Indo (2.5 mg/Kg), and Mk (1 mg/Kg/w) plus Indo (2.5 mg/Kg) showed a stronger inhibitory effect at 12 hours when comparing with Mk at either dose alone (Fig. 3). When Mk 0.01mg/Kg/w and Indo (2.5 mg/Kg) were used in combination the reduction reached 92.7 % and 94.6% (Fig. 3).

Effect of Mk and Indo on the differential cell count in the inflammatory exudate induced by SMU in the air pouch mice model

Fig. 4 shows the differential cell count of inflammatory exudates in the experimental groups at 12 hours. SMU-treated air pouch mice showed a total number of 6,071,250 cell/mL, with a predominance of polymorphonuclear cells (73%). In PBS-treated mice the total number of cells was 200,000/mL, with a predominance of mononuclear cells (68 %). At the doses 0.01 and 1 mg/Kg Mk significantly decreased in the total number of cells 1083 (17%) and 957 (7%), respectively, with a greater effect over the percentage of polymorphonuclear cells. Indo also modified the total number of cells but the most important effect was seen on mononuclear cells 39,463 (5%).

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DISCUSSION

The current drug therapy for GA is limited and is frequently accompanied by common adverse reactions (19). NSAIDS, which are the first line of choice therapy for GA, have a partial effect on the characteristic inflammatory response of this disease, perhaps due to their inability to block the synthesis of LTs (19). As relatively innocuous antagonists of LTs receptors are now available and have been proven beneficial in diverse inflammatory conditions (12-14) we sought to study the effect of Mk and compare it to that of Indo, the most commonly prescribed NSAID in gouty arthritis, using an experimental gouty arthritis model (air pouch) in BALB/c. SMU crystals can induce a rapid and intense inflammatory cellular infiltration, with a prominence of neutrophils in a subcutaneous cavity (air pouch), with a pattern similar to the inflammatory cell infiltrate seen in patients with acute gouty arthritis (20). Our results confirmed previous observations supporting the validity of this model (air pouch) to study this type of inflammation (7, 21).

The administration of Mk significantly reduced the cellular infiltrate induced by SMU crystals in the air pouch during both, the early and late phases of inflammation. It also modified the differential cellular count by significantly decreasing the percentage of polymorphonuclear cells. Our results may suggest that Mk mainly affects the influx of neutrophils, having only a partial effect on mononuclear cells. Doses as low as 0.01 mg/Kg/w of Mk were shown as effective as 1 mg/Kg/w, except at 24 hours. The inhibitory effect of Indo alone in the overall cell count was seen earlier and was slightly superior than that of Mk. Interestingly, unlike the effect of Mk, Indo showed a predominat effect on mononuclear rather than polymorphonuclear cells, that may be explained by the preferential blockade of the cyclooxygenase pathway that has a lesser effect on the chemotaxis of polymorphonuclear cells. When combined at optimal doses, both drugs showed an clear additive effect. Our results confirm that mediators derived from the cyclooxygenase and the lipooxygenase pathways participate in the inflammatory response of gouty arthritis.

Previous investigations (22) showed that LTB4 is the strongest LT triggering inflammation induced by SMU, by having a significant effect on the chemotaxis and activation of neutrophils (4, 23). In addition, LTB4 is known to induce the synthesis of pro-inflammatory cytokines such as IL-8, IL-1 y TNF-a (23-25). Mk is a selective antagonist of the LTD4 receptor, a pathway shown to play minor role gouty arthritis (26, 27), Therefore, it is possible that LTD4 may have a heretofore unknown role in acute gouty arthritis. Alternatively, Mk may act inhibiting the synthesis and/or the effect of LTB4 as recently suggested by the demonstration that antagonist of LT receptors are alosteric inhibitors of the 5-lipooxygenase enzyme (28).

In fact, in the study by Ramires et al. (28), and similar to findings reported in a zimosan rat model model of rheumatoid arthritis (29), it was shown that blocking the activity of LTs plays an important role in decreasing the inflammatory response induced by SMU crystals and zimosan. Our results suggest that antagonists of LT receptors, alone or in combination with NSAIDS, can be a potentially beneficial therapy in the control of acute GA.

Received: 07-12-2009. Accepted: 07-10-2010.

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Loida Ponce [1], Marjorie Arjona [1], Gustavo Blanco [1], Stuart Alvarez [1], Eduardo Arcila [1], Arnaldo Ortega [1], Dubelis Nunez [1], Julie Verzura [1], Robert Tovar [1], Sarah Bethencourt [1], Ricardo Riera [2], Sioly Mora-Orta [1] and Jose Corado [1].

[1] Unit of Investigation in Immunology (UNIVENIN), Department of Physiological Sciences, Faculty of Health Sciences, University of Carabobo, Barbula and

[2] Hospital "Dr Enrique Tejera", Rheumatology Department. Valencia, Venezuela.

Corresponding author: Jose Corado. Unit of Investigation in Immunology (UNIVENIN), Department of Physiological Sciences, Faculty of Health Sciences, University of Carabobo. P.O. Box 3798 Valencia 2002, Venezuela. Phone: 0058- Fax: 0058-02412184599. E-mail: jcorado@uc.edu.ve.
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Title Annotation:texto en ingles
Author:Ponce, Loida; Arjona, Marjorie; Blanco, Gustavo; Alvarez, Stuart; Arcila, Eduardo; Ortega, Arnaldo;
Publication:Investigacion Clinica
Date:Mar 1, 2011
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