Formalin-induced Paw Edema Model Research Articles

Evaluation of the anti-inflammatory activity of dipyridamole in acute and chronic experimental models in albino rats

Background: Cyclic nucleotides, particularly cyclic AMP, have an important regulatory role in a variety of inflammatory processes. The concentration of cAMP can be influenced by either inhibition of phosphodiesterase enzyme or by activating adenylate cyclase enzyme. The present study was undertaken to evaluate the anti-inflammatory activity of dipyridamole a selective (PDE6) phosphodiesterase inhibitor; on acute and chronic experimental models in albino rats. Methods: Anti-inflammatory activity was evaluated by using carrageenan-induced rat hind paw oedema model for assessing acute anti-inflammatory activity. The normal paw volume (0 hour) and the volume of injected paw (3 hour) were measured by using plethysmometer. Assessment of chronic anti-inflammatory activity was carried out using formalin-induced rat paw edema model. The paw volume was measured at 0 hour and on 7 th day after injection of formalin by using plethysmometer. The results obtained were compared with the control and the standard anti-inflammatory drug, indomethacin. Results: The results indicated that dipyridamole has anti-inflammatory action in both acute and chronic inflammatory models. But statistically significant anti-inflammatory action was seen only with the chronic inflammatory model (0.11±0.05 units, p=0.02). Anti-inflammatory activity could be due to inhibition of inflammatory cells and mediators especially histamine, leukotrienes and eicosanoids. Conclusions: Selective phosphodiesterase inhibitors could be a source of valuable anti-inflammatory drugs, in addition to currently available steroidal and non-steroidal anti-inflammatory agents.

Pharmacological Evaluation ofTrichilia connaroidesBark for Analgesic and Anti-inflammatory activity in Experimental Animal Models

The present study was designed to evaluate the analgesic and anti-inflammatory activity of “Trichilia connaroides” bark using different animal models. Analgesic activity was evaluated by using various two animal models namely, Writing Test using acetic acid in mice and Hot Plate Method. The degree of analgesic activity was determined by the number of wriths was recorded for each animal in Writing Test using acetic acid in mice model and the delay in reaction time for of each animal when place in hot plate maintained at 55±0.10c is recorded in Hot Plate Method. Anti-inflammatory activity was evaluated using Formalin induced paw edema model, Croton oil ear edema in rats. Trichilia connaroides bark ethanolic extracts produced significant analgesic activity in both Hot plate and acetic acid induced writhing models in mice. In hot plate method percentage increase in reaction time was determined where as in acetic acid induced writhing model percentage decrease in writhings was determined. Evaluation of anti inflammatory activity was done by Formalin induced paw edema model, Croton oil ear edema model. In Formalin induced paw edema model mean change in paw volume and percentage protection were calculated. In croton oil ear edema model the difference between untreated ear and treated ear were determined which indicated degree of inflammatory edema. The study revealed that the “Trichilia connaroides”bark possess a significant analgesic and anti-inflammatory activity.

Modulatory Role of Morphine and Gabapentin as Anti-inflammatory Agents Alone and on Coadministration with Diclofenac in Rat Paw Edema

Objective: To evaluate the anti- inflammatory effects of Morphine and Gabapentin alone and as adjuvant with diclofenac by using formalin induced paw edema model. Methods: After acclimatization of one week, adult Sprague-Dawley rats were divided into two groups: control and treatment (n=6). Treatment group received diclofenac (10 mg/kg), gabapentin (150 mg/kg), morphine (15 mg/kg), gabapentin (150 mg/kg) + diclofenac (10 mg/kg) and morphine (15 mg/kg) + diclofenac (10 mg/kg), respectively. Paw edema was produced by injecting 0.2ml of 2% formalin subcutaneously on the dorsal surface of right hind paw. Animals received drug treatment 30 minutes before injection of formalin and paw volume was measured at 0, 30, 60, 120 and 240 minutes after formalin challenge with help of mercury plethysmometer. Results: Both morphine and gabapentin alone and in combination with diclofenac caused a significant reduction (p< 0.01) in rat paw edema when compared to group given saline only. Reduction in paw edema with gabapentin and diclofenac was significantly superior when compared with either drug alone. Conclusions: Combination of gabapentin and diclofenac showed synergistic anti-inflammatory effect as compared to either drug alone or combination of morphine + diclofenac groups.

Evaluation of Anti-diabetic and Anti-inflammatory activities of ethanolic extract of whole plant ofInula racemosa

The present study was designed to evaluate the antidiabetic and anti-inflammatory activity of ethanolic extract of whole plant of “Inula racemosa” using different animal models. Antidiabetic activity was evaluated by using various two animal models. The alloxan induced diabetes method and streptozocin induced diabetes method along with biochemical parameters like SALP, SGPT, SGOT, Triglycerides, Total proteins were employed to investigate antidiabetic potential of Inula racemosa. Anti-inflammatory activity was evaluated using formalin induced paw edema model and croton oil ear edema model. Carrageenan induced paw edema model uses change in paw volume of control, test, and standard respectively to find out percentage inhibition of edema. The study revealed that the whole plant of “Inula racemosa” possess a significant anti-diabetic and anti-inflammatory activity.

Nano-proniosomes enhancing the transdermal delivery of mefenamic acid

Mefenamic acid (MA) is a BCS II class NSAID drug. It is available only in the form of tablets, capsules, and pediatric suspensions. Oral administration of MA is associated with severe gastrointestinal side effects. The aim of this study was to develop a convenient and low-cost transdermal drug delivery system for MA using proniosome as a novel carrier without the addition of penetration enhancers. The formulation factors, such as the presence of cholesterol, types of lecithin, and surfactants were investigated for their influence on the entrapment efficiency, rate of hydration, vesicle size, and zeta potential, in vitro drug release and skin permeation in order to optimize the proniosomal formulations with the minimum dose of the drug. Furthermore, the in vivo anti-inflammatory effect was evaluated on a formalin-induced rat paw edema model. The results showed that the type of surfactants had higher impact on the entrapment efficiency than the type of lecithins, with the highest in Span 80 (82.84%). The release of MA from Span 80 proniosomal gel was significantly affected by the type of lecithin used. The addition of cholesterol significantly increased both the drug release and the skin permeation flux of MA. Zeta potential showed a stable A4 noisomal suspension. DSC revealed the molecular dispersion of MA into the loaded proniosomes. In vivo study of the treatment group with MA proniosome gel showed a significant inhibition of rat paw edema compared with the same gel without the drug (control). The results of this study suggest that proniosomes are promising nano vesicular carriers and safe alternatives to enhance the transdermal delivery of MA.

Synthesis of Some 4,5-Dihydrothieno[3,2-e][1,2,4]Triazolo[4,3-a] Pyrimi-dine-2-Carboxamides as Anti-Inflammatory and Analgesic Agents

A new series 4,5-dihydrothieno[3,2-e][1,2,4]triazolo[4,3-a]pyrimidine-2-carboxamide was synthesized. Twenty one newly synthesized compounds were investigated for their anti-inflammatory and analgesic activity using acute and subacute formalin-induced paw edema models and diclofenac Na as a reference. The acute toxicity (ALD50) and ulcerogenic effects of the active compounds were also determined. The thienotriazolopyrimidines 10a, 10c and 11c were found to exhibit remarkable anti-inflammatory activity at both models in addition to good analgesic activity with a delayed onset of action. Moreover, the active compounds showed high GI safety level and are well tolerated by experimental animals with high safety margin (ALD50 > 0.4 g/kg). Docking study using Molecular Operating Environment (MOE) version 2008.10 into COX-2 has been made for derivatives of highest anti-inflammatory activity.

Anti-inflammatory effects of Urtica pilulifera l. seeds extracts in the rat

Urtica pilulifera l. seeds extracts (Decocted and Methanolic extracts) have anti-inflammatory effects. In an experimental-interventional study, Anti-inflammatory effects of Urtica pilulifera l. (UPL), a Traditional Iranian Medicine (TIM) plant, were examined with formalin-induced hind paw edema model in the rat. Sodium salicylate (S.S) injection (300 mg/kg; IP) was used as a positive control group and was put to comparison with methanolic extract of UPL (20 mg/kg; IP), three doses of decocted extract of UPL (20, 40 and 80 mg/kg; IP) and a group of distilled water (6 ml/kg; IP). The differences were estimated by means of one-way ANOVA followed by LSD test for acute anti-inflammatory studies (One hour after formalin injection), and by means of Student's unpaired t-test for the chronic studies (Day one to day seven edema surveys). In Acute anti-inflammatory studies, two doses of decocted UPL extract (40 mg/kg and 80 mg/kg) and S.S group had anti-inflammatory effects (p-value

Anti-inflammatory activity of aqueous extract of Mirabilis jalapa Linn. leaves.

Background:Theobjective of the present study was to evaluate the anti-inflammatory activity of aqueous extract of Mirabilis jalapa Linn. (MJL)(Nyctaginaceae) leaves for scientific validation of the folklore claim of the plant. The leaves are used as traditional folk medicine in the south of Brazil to treat inflammatory and painful diseases. Cosmetic or dermo-pharmaceutical compositions containing MJL are claimed to be useful against inflammation and dry skin. Methods:Aqueous extract of the leaves was prepared by cold maceration.Results:The anti-inflammatory activity was evaluated using carrageenan and formalin-induced paw edema models in Wistar albino rats. The anti-inflammatory activity was found to be dose dependent in carrageenan-induced paw edema model. The aqueous extract has shown significant (P < 0.05) inhibition of paw oedema, 37.5% and 54.0% on 4 th hour at the doses of 200 and 400 mg/kg, respectively. Similar pattern of paw edema inhibition was seen in formalin-induced paw edema model. The maximum percentage inhibition in paw edema was 32.9% and 43.0% on 4 th day at the doses of 200 and 400 mg/kg, respectively.Conclusion:The results of present study demonstrate that aqueous extract of the leaves possess significant (P < 0.05) anti-inflammatory potential.

Free radical scavenging and anti-inflammatory properties of Lagerstroemia speciosa (L)

The in vitro antioxidant activity of the successive extracts (ethyl acetate, ethanol, methanol and water) of the leaves of Lagerstroemia speciosa L. (Lythraceae) were studied by examining their superoxide, hydroxyl ion scavenging and by measuring lipid peroxidation. The ethyl acetate and ethanol extracts were found to possess greater antioxidant property than the methanol and water extracts. Anti-inflammatory activity of the ethyl acetate and ethanol extracts were examined using the carrageenan-induced acute inflammation and formalin-induced (chronic) paw edema models. In acute and chronic inflammation models, the ethyl acetate extract reduced the paw edema significantly in a dose-dependent manner. Whereas, ethanol extract did not show dose-dependent activity. This results suggests that the anti-inflammatory activity is possibly attributed to its free radical scavenging activity. It was found that ethyl acetate extract reduced the inflammation more significantly than the ethanol extract.

Synthesis, characterization, and antiinflammatory activity of Naproxen complexes with rare earth (III)

RE(III) complexes of Naproxen(HNap) have been synthesized and characterized by elemental analyses, conductance measurements, solubilities, thermal analysis, infrared, proton magnetic resonance, and electronic spectral data. The elemental analyses reveal the presence of 1:3 (metal:ligand) stoichiometry and the IR spectra suggest the carboxylate group of HNap functions, as a bridging ligand to coordinate to RE(III) ions. The electronic spectra recorded in solid exhibit only slight shifts in visible regions, on which β, δ and b 1 2 of covalent parameters have been calculated. Formalin-induced rat paw edema and croton oil-induced rat ear edema inflammatory models were chosen to examine the antiinflammatory activity of Nd(III) complex, which ascertained enhanced antiinflammatory activity relative to the ligand.