Evaluation of antiproliferative and anti-inflammatory activities of methanol extract and its fractions from the Mediterranean sponge
© Dellai et al.; licensee BioMed Central Ltd. 2012
Received: 8 March 2012
Accepted: 15 May 2012
Published: 15 May 2012
Without doubt, natural products have been, and still are, the cornerstone of the health care armamentarium. Of all natural sources, the marine environment is clearly the last great frontier for pharmaceutical and medical research.
This work progresses in the direction of identifying component(s) from the Mediterranean sponge, Spongia officinalis with pharmacological activities. In the present study we investigated the efficacy of methanol extract and its semi-purified fractions (F2, F3) from Spongia officinalis for their in vivo anti-inflammatory activity using the carrageenan-induced paw edema in rats and their in vitro antiproliferative effects by their potential cytotoxic activity using the MTT colorimetric method and clonogenic inhibition against three human cancer cell lines (A549, lung cell carcinoma, HCT15, colon cell carcinoma and MCF7, breast adenocarcinoma).
The fractions F2 and F3 showed interesting anti-inflammatory and antiproliferative activities in a dose dependent manner.
The present study indicates that the methanolic extrac and its fractions from Spongia officinalis are a significant source of compounds with the antiproliferative and anti-inflammatory activities, and this may be useful for developing potential chemopreventive substances.
KeywordsSpongia officinalis Anti-inflammatory activity Antiproliferative activity
A variety of ingredients of traditional medicines and herbs are being widely investigated in several parts of the world to analyze their potential as therapeutic agents [1–3]. Since the few last decades, marine environment have been recognized to be a rich sources of bioactive metabolites with varied biological and pharmacological activities [4, 5]. The most interesting phyla with respect to pharmacological active marine compounds include bacteria, fungi, algae, soft corals and gorgonians, sea hares and nudibranchs, bryozoans, tunicates and especially sponges . Marine sponges have been considered as a gold mine during the past few decades with respect to the diversity of their secondary metabolites and continue to provide novel natural products with a remarkable chemical diversity. At present, there are a number of compounds from marine origin which are under investigation and/or are being developed as new pharmaceuticals on anticancer therapies [7, 8]. A number of compounds possess antispasmodic, antimalarial, antifungal, antifouling, insecticidal, antiviral , antibacterial  and anti-inflammatory activities . The objective of the present study was to evaluate the potency of methanol extract and its semi-purified fractions (F2, F3) from Spongia officinalis for inhibiting inflammation induced by carrageenan and for growth and clonogenic inhibiting of three human cancer cell lines A549, HCT15 and MCF7 with the aim of identifying novel molecules with interesting and potentially useful pharmacological activities.
Materials and methods
Sample collection and preparation of the methanol extract
The marine sponge, Spongia officinalis was collected from the Mediterranean Sea, in various areas of the coastal region of Monastir (Tunisia), in July 2010, at a depth between 2 and 5 meters. The collected samples were cleaned by rising with sea water and distilled water and transported in cool box to the laboratory where they are kept in a freezer (−20°C). Identification of specimen was carried out in the National Institute of Marine Sciences and Technologies, Salamboo, Tunisia.
The samples were defrosted, macerated in distilled water and then air dried at 30°C and finely powdered. 600 g of finely powdered sponge material were packed in small bags (5x10 cm) of Whatman filter paper No. 1 and all bags were sealed and soaked in a methanol bath three times, steeping for 48 h. The methanol extracts were combined and evaporated under vacuum at low temperature (<40°C) and then stored at −20°C until use.
Purification of the methanol extract
In order to localize the active fraction, methanol extract of Spongia officinalis was purified, using C18 cartridges (Sep-pack, Supelco), by gradient elution with methanol–water mixture (0%, 50% and 80% methanol) to give 3 fractions (F1, F2 and F3). Methanol solvent was removed from fractions recuperated using rotating evaporator at 35°C and distilled water was then added to the residues and the aqueous phases were lyophilized. The powdered fractions were stored at −20°C until use.
Methanol extract, F2 and F3 fractions were diluted to the desired final concentration immediately prior manipulation.
For the anti-inflammatory evaluation of the methanol extract and its semi-purified fractions (F2, F3), adult Wistar rats (150-180 g) of both sex, provided from Pasteur institute (Tunis, Tunisia) were used. All animals were fed a standard diet ad libitum and allowed free access to drinking water. Animals fasted overnight before any experiments. Housing conditions and in vivo experiments were approved according to the guidelines established by the European Union on Animal care (CEE Council 86/609) .
Carrageenan induced rat paw edema
The human tumor cell lines A549 (lung cell carcinoma), HCT15 (colon cell carcinoma) and MCF7 (breast adenocarcinoma) were obtained from the American Type Culture Collection (ATCC, Manassas, VA). Cells were routinely grown with DMEM supplemented with 10% fetal calf serum and 1% penicillin/streptomycin, all obtained from Biochrom AG (Berlin, Germany). They were grown on Flasks (Nunc, Denmark) at 37°C in a humidified atmosphere containing 5% CO2. Cells were replicated every 4–5 days and the medium changed once in-between.
The potential effects on cell viability were investigated according to previously reported conditions [13, 14], using the MTT assay [3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl tetrazolium bromide, Sigma-Aldrich Chimie, Saint-Quentin-Fallavier, France] as an indicator of metabolically active cells .
Known number of A549, HCT15 or MCF7 cells (103) were transferred into 96-well plates (Nunc, Denmark) in a volume of 200 μl of culture medium and incubated for 24 h before addition of test compounds. Cells were then exposed for 24 h at 37°C to known concentrations of the methanol extract or fractions to be tested. After drug exposure, the cells were washed with phosphate-buffered saline and then reincubated in fresh culture medium for a further 48 h, then the culture medium was removed and 200 μl of MTT reagent (diluted in culture medium, 0.5 mg/ml) was added. Following incubation for 4 h, the MTT/medium was removed and DMSO (200 μl) was added to dissolve the formazan crystals. Absorbance of the colored solution was measured on a microplate photometre (Bio-Tek Instruments) using a test wavelength of 570 nm and a reference wavelength of 630 nm. Results were evaluated by comparing the absorbance of the treated cells with the absorbance of wells containing cell treated by the solvent control. Conventionally, cell viability was estimated to be 100% in the solvent control. All experiments were performed at least twice in triplicate. The concentration of substance required for 50% growth inhibition (IC50) was estimated according to the method described by Dellai .
Clonogenic inhibition assay
The clonogenic inhibition assay was performed as described previously by Nicolas et al.  with some modifications. Known number of A549, HCT15 or MCF7 cells (2.104) were transferred into six-well plates (Becton Dickinson Labware, USA) in a volume of 2 ml of culture medium and incubated for 24 h before addition of test compounds. Cells were then exposed for 24 h at 37°C to known concentrations of the compound to be tested. After drug exposure, the cells were washed with phosphate-buffered saline and subsequently re-plated in appropriate dilution in triplicate to assess clonogenic ability. After incubation for 14 days, each plate was stained with crystal violet and colonies were counted with a “colony counter pen”. The surviving fraction was calculated as the ratio of the number of colonies formed after treatment to the product of the number of cells plated and the plating efficiency. The IC50 value is the concentration of the drug which is capable of bringing about 50% inhibition of colony formation.
For all our experiments, a one-way ANOVA was used to analyze the differences between groups, followed by a Duncan’s test with a threshold of significance of p < 0.01 and p < 0.001 to detect specific differences, using a statistical software package (STATISTICA edition 99 Maisons-Alfor- France). We used this post hoc test or multiple comparison tests, to determine the significant differences between a single control group mean and the remaining treatment group means in an analysis of variance setting.
Evaluation of anti-inflammatory activity
Anti-inflammatory effect of the intraperitoneal administration of methanol extract and its semi-purified fractions (F2-F3) of Spongia officinalis in Carrageenan-induced rat paw edema test
Treatment Dose (mg/kg)
Edema inhibition (%)
ASL (Reference drug)
Evaluation of antiproliferative activity against tumor cell lines
In vitro growth inhibitory activity of the semi-purified fractions, F2 and F3, of Spongia officinalis: against the three human tumor cell lines A549 (lung cell carcinoma), HCT15 (colon cell carcinoma) and MCF7 (breast adenocarcinoma)
In vitro colony inhibitory activity of the semi-purified fractions, F2 and F3, of Spongia officinalis against three human tumor cell lines: A549 (lung cell carcinoma), HCT15 (colon cell carcinoma) and MCF7 (breast adenocarcinoma)
Both F2 and F3 semi-purified fractions of Spongia officinalis showed, in vitro, significant antiproliferative activities. The IC50 values clearly indicated that the semi-purified fraction F3 had a much more potent effect, on the three human tumor cell lines tested, than F2. In term of cell line sensitivity, different responses were observed against the three human tumor cell lines, and no effect was observed on HCT15 cells with the semi purified F2.
Carrageenan rat paw edema assay is one of the most commonly used assays to assess anti-inflammatory activity of marine natural products from sponges [10, 19]. Carrageenan rat paw edema test produced an acute inflammation that results from the sequential action of several mediators. Histamine and serotonin were mainly released during first 1.5 h after carrageenan injection, kinin was released until 2.5 h and at the last step inflammation was continued until 5 h by prostaglandins [20–22]. The anti-inflammatory activity of the methanol extract and its semi-purified fractions suggest that they could interfere with some of the mediators, by inhibiting their productions or antagonize their actions. Anti-inflammatory drugs such as aspirin and other NSAIDs act by downregulating prostanoids synthesis. Prostanoids are potent biologically active arachidonic acid derived lipid mediators that are intimately involved in inflammation and cancer . In addition to their anti-inflammatory activity, Spongia have also cytotoxic properties. Related agents, such as macrolide , furanoditerpene , polyketide , alkaloid, sesterterpene, triterpene, furanoterpene [10, 27, 28], diterpene , sesquiterpene and nucleoside , have already been isolated from other species of the genus Spongia.
The functional tests to predict the response of tumors to cytotoxic drugs comprise the MTT reduction and clonogenic assay. The MTT colorimetric assay [15, 17] is based on the ability of metabolically active cells to convert the pale yellow MTT to a blue formazan product, which is quantifiable spectrophotometrically and the clonogenic assay or colony formation assay is an in vitro cell survival assay based on the ability of a single cell to grow into a colony. The colony is defined to consist of at least 50 cells. This clonogenic assay has been used in the ensuing decades for a large variety of studies with many types of cells. The assay detect all cells that have retained the capacity for producing a large number of progeny after treatments that can cause cell reproductive death as a result of damage to chromosomes, apoptosis .
In the current study, both F2 and F3 fractions of the Mediterranean sponge, Spongia officinalis showed, in vitro, a significant antiproliferative activity against three human cancer cell lines A549, HCT15 and MCF7. The IC50 values clearly indicated that the semi-purified fraction F3 had a much more potent effect on the three human tumor cell lines than F2 and should be tested on several other cancer cell lines.
All these findings support the need for further investigations to clarify the features underlying the anti-inflammatory and the antiproliferative potential of these fractions. Biochemical and molecular studies carried out using the fraction in different animal models to establish their therapeutic efficacy, and subjected to HPLC and LC&MS analyses to identify and characterize the efficacious bioactive compound(s) in Spongia officinalis.
The authors acknowledge the “Ministry of Higher Education, Scientific Research and Technology, Tunisia”.
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