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Antinociceptive and cytotoxic activities of an epiphytic medicinal orchid: Vanda tessellata Roxb.

BMC Complementary and Alternative Medicine volume 14, Article number: 464 (2014) Cite this article

Abstract

Background

Vanda tessellata (Orchidaceae) has been used in different sorts of ailments such as inflammations, rheumatism, dysentery, bronchitis, dyspepsia and fever in folk medicine. In this study we evaluated the antinociceptive and cytotoxic effect of methanol and aqueous extracts of V. tessellata leaf.

Methods

Oral administration of V. tessellata aqueous (VTA) and methanol (VTM) leaf extracts at 200 and 400 mg/kg body weight (bw) doses were assessed for antinociceptive activity in acetic acid-induced writhing test, hot plate test, and tail immersion test in mice. In this study we also screened for cytotoxicity of the extracts by the brine shrimp (Artemia salina) lethality assay.

Results

The extracts, at both doses, exhibited a significant (p < 0.05 - < 0.01) dose-dependent antinociceptive activity in hot plate and tail immersion test. The reaction time was increased to the thermal stimuli at 200 and 400 mg/kg doses up to 90 min. In acetic acid-induced writhing test, oral administration of VTA and VTM (200 and 400 mg/kg) also decreased the writhing significantly while compared to control. The dose 400 mg/kg showed maximum percentage of pain inhibition 42.37% and 45.08% for VTA and VTM respectively. Diclofenac sodium (10 mg/kg) and nalbuphine (10 mg/kg) were used as reference antinociceptive drugs. Very low cytotoxicity was observed on brine shrimps lethality assay.

Conclusions

The leaf extract has potential antinociceptive activity with minimum cytotoxicity. The present study supports the use of V. tessellata in different inflammatory disorders.

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Background

Most analgesic drugs such as NSAIDs, COX-2 inhibitors and opioids exhibit an extensive range of adverse effects including gastrointestinal disorders, kidney problems and other unwanted effects. Drug regulatory authorities have been imposed a boxed warning on the label of some COX-2 selective inhibitor for cardiovascular and gastrointestinal risks [1]. Similarly, addiction and misuse of opioids is a growing problem [2]. Analgesic choice is also determined by the type of pain, for example, traditional analgesics are less effective in neuropathic pain [3]. Therefore, advent for safe and effective analgesic drugs is still challenging for the researchers.

Nowadays, natural products as an alternative and complementary medicine to many ailments have been a major interest among researchers. In addition to documenting the traditional knowledge related to medicinal plants, scientific authentication of these medicinal plants has been an important path of recent research [4]. Vanda tessellata Roxb. (Orchidaceae), locally known as Rasna, has been used in folk medicine for its multifarious medicinal properties [5]. It is an epiphytic perennial herb, scandent by the stout and having simple or branching aerial roots distributed throughout Bangladesh, Indian subcontinent and Indochina. Leaves are succulent, 15–20 cm long, linear, recurved and complicate. Roots are alexiteric and antipyretic and useful in dyspepsia, bronchitis, diseases of the abdomen, bronchitis, piles, hiccough and tremors [6]. Externally the root is used in rheumatism and allied disorders and diseases of the nervous system. It is a great panacea for oligomenorrhea, amenorrhea and dysmenorrheal, as it augments uterine contractions. It is also remedy for secondary syphilis and scorpion sting. In addition, juice of the leaves is given in otitis and the paste as febrifuge. Unani practitioners hold it to be laxative and tonic to the liver. It is also used to treat boils on the scalp [7, 8]. V. tessellata leaves are used in folk medicine for the treatment of cough, edema, respiratory difficulties, poisoning of blood due to rheumatism, fever and paralysis in Bangladesh. Leaves of V. tessellata are macerated with ginger slices (rhizomes of Zingiber officinale Roscoe) and applied to affected areas and that application for a long time gives good results in paralysis and is satisfactory for rheumatic pain [9–11].

Experimentally, various pharmacological properties of V. tessellata have been reported, in particular anti-inflammatory [6, 12], antimicrobial [13], anticonvulsant [14, 15], wound healing [16], antioxidant [17], hepatoprotective [18], antidiarrheal [19], mast cell stabilization [20], cerebral anti-ischemic [21] and aphrodisiac [22, 23] properties. Phytochemical screening of the plant has revealed an alkaloid, a glucoside, tannins, β-sitosterol, γ-sitosterol and a long chain aliphatic compound, fatty oils, resins and colouring matters. Roots contain tetracosyl ferrulate and β-sitosterol-D-glucoside [7, 24]. Some bioactive compounds have been isolated from V. tessellata are 2,7,7-tri methyl bicyclo [2.2.1] heptanes [23], 17-β-hydroxy-14,20-epoxy-1-oxo-[22R]-3β-[O-β-d-glucopyranosyl]-5,24-withadienolide [25], and melianin [13].

The most frequent approach to species selection for phytochemical and/or pharmacological analysis is by reviewing the ethnobotanical literature [26]. In view of this evidence from the existing literatures showing that V. tessellata has variegated traditional uses against different sorts of diseases. Thus, the present study was aimed to investigate the antinociceptive and cytotoxic activities of methanol and aqueous extracts of Vanda tessellata leaf.

Methods

Plant material

Vanda tessellata leaves were collected from a rustic area (Dholia) of Feni district, Bangladesh and authenticated by the expert of Bangladesh Forest Research Institute, Chittagong, Bangladesh (Accession No. 4306) where a voucher specimen has been deposited for further reference.

Extract preparation

After washing and cutting the leaves into small parts, the leaves were air-dried in a shade and finally in a mechanical drier (Ecocell, MMM Group, Germany) at 55-60°C. The dried samples were ground to course powder with a mechanical grinder (NOWAKE, Japan). The powder (200 g) soaked in 800 ml methanol for a week at room temperature with occasional shaking and stirring on a shaker machine, and then filtered through a cotton plug followed by whatman filter paper No. 1. The solvent was evaporated under vacuum at room temperature to yield semisolid. To prepare aqueous extract the leaf powder (200 g) was soaked in distilled water (800 ml) overnight at room temperature and the solvent was filtered. The filtrate was distilled and concentrated under reduced pressure. The final yield was 1.6% w/w (VTM) and 1.2% w/w (VTA), respectively. The extracts were preserved in a refrigerator till further use.

Experimental animals

Swiss albino mice, weighing about 25–30 g, were collected from Jahangir Nagar University, Savar, Bangladesh. The animals were provided with standard laboratory food and distilled water ad libitum and maintained at natural day-night cycle having proper ventilation in the room. All the experiments were conducted in an isolated and noiseless condition. The study protocol was approved by the P&D Committee, Department of Pharmacy, International Islamic University Chittagong, Bangladesh (Pharm-P&D-37/07’12). The animals were acclimatized to laboratory condition for 10 days prior to experimentation.

Drugs and chemicals

Diclofenac Na (MERCK, Mumbai, India), nalbuphine (Square Pharmaceuticals Ltd., Bangladesh), formaldehyde (MERCK, Mumbai, India), and 0.9% NaCl saline solution (Popular Pharmaceuticals Ltd., Bangladesh) were used. All other reagents were of analytical grade.

Acute oral toxicity test

Acute oral toxicity test was carried out in accordance with the Organization for Economic Cooperation and Development (OECD) guidelines for testing of chemicals, 420 [27]. Swiss albino mice maintained under standard laboratory conditions were used for acute toxicity study. A total of three mice from each group received a single oral dose (5, 50, 300, and 2000 mg/kg bw of the extract. Animals were kept over-night fasting prior to administration. After administration of the extracts (VTA and VTM), food was withheld for further 3 to 4 h. The animals were then individually observed (with special attention during the first 4 h) for possible behavioral changes, allergic reactions (skin rash, itching), eyes and mucous membrane, and mortality for the next 72 h.

Photochemical screening

For preliminary phytochemical analysis the freshly prepared crude methanol extract of leaves were dissolved in suitable solvent and tested for the presence or absence of phytoconstituents such as reducing sugar, flavonoids, tannins, saponins, phytosterols and alkaloids by using standard phytochemical procedures [28].

Antinociceptive activity

Acetic acid-induced writhing test

For writhing test, 0.6% (v/v) acetic acid solution (10 mL/kg body weight) was injected intraperitoneally (i.p) to each mice of six groups (n = 5) and the number of writhing and stretching were counted over 20 min. Group I served as control received normal saline, Group II received diclofenac sodium (10 mg/kg) as a standard, group III-IV received V. tessellata aqueous extract (VTA), and group V-VI received V. tessellata methanol extract (VTM) at the dose of 200 and 400 mg/kg bw orally (p.o), respectively 30 min before acetic acid injection [29].

Hot plate method

The antinociceptive activity of the extracts was also measured by hot-plate method [30]. Mice were divided into six groups of five animals each. Group I treated as control (saline water 10 mg/kg), group II received standard drug (diclofenac sodium 10 mg/kg i.p), group III-IV received VTA and group V-VI received VTM (200 and 400 mg/kg bw p.o, respectively). The temperature of the hot-plate was maintained at 55 ± 1°C. The mice were placed in a 24 cm diameter glass cylinder on the heated surface and the time between placement and licking of the paws or jumping was recorded as the latency. A cut off time of 20s was followed to avoid any thermal injury to the paws and was defined as complete analgesia. The reaction time were recorded before (0 min) and after 15, 30, 45 and 60 min following administration of test samples or standard drug.

Tail immersion method

Animals were screened based on their reaction time at 3–5 sec when subjected to pain stimulus. Mice were divided into six groups of five animals each. Group I represented as control received normal saline and group III-IV received VTA and group V-VI received VTM (200 and 400 mg/kg bw p.o, respectively). Group II received the standard drug nalbuphine (10 mg/kg) subcutaneously (s.c). The animal withdrawing tails from hot water within 5 sec were selected for the study. The lower 3 cm portion of the tail of mice was dipped in a water bath (Le-Chatelier Thermostat, UK) maintaining at temperature of 55 ± 0.5°C. The time in second (s) for tail withdrawal from the water was taken as the reaction time and recoded by a stopwatch at before (0 min) and after 30, 60 and 90 min the administration of test samples. A maximum immersion time of 15 sec was maintained to prevent thermal injury to the animals [31].

In vitro cytotoxicity test

General toxicity of the extract was tested by the brine shrimp (Artemia salina) lethality assay [32]. Artificial sea water was prepared by dissolving 38 g of NaCl (3.8%) in 1000 ml of distilled water and was filtered off to obtain a clear solution. The dried cysts of the brine shrimps were hatched in artificial seawater with strong aeration for 48 hours. Methanol extract was dissolved in sea water with DMSO (not exceed 0.01%) and transferred to test tubes to obtain concentrations of 12.5, 25, 50, 100, 200 and 400 μg/ml in 5 ml artificial sea water with 20 nauplii in each test tube. Standard drug vincristine sulphate was used as positive control at concentrations of 5, 2.5, 1.25, 0.625, and 0.312 μg/ml. Control test tubes were subjected to DMSO in artificial seawater at the same concentration as in test tubes for test samples. After 24 h incubation at 25-30°C, the number of viable nauplii was counted using a magnifying glass. The percent (%) mortality was calculated using the following formula:

%Mortality= N t N 0 ×100

Where, Nt = Number of dead nauplii after 24 hrs of incubation, N0 = Number of total nauplii transferred (n = 20). The Median lethal concentration (LC50) was then determined.

Statistical analysis

The data was analyzed by one-way ANOVA followed by Dunnet’s test to estimate significant differences between the test and control groups with GraphPad Prism Data Editor for Windows, Version 5.0 (GraphPad software Inc., San Diego, CA). Values were expressed as mean ± Standard error for mean (± SEM). p < 0.05 - 0.01 were considered as statistically significant.

Results

Acute oral toxicity test

When a single dose of VTA and VTM was orally administered up to a concentration of 2000 mg/kg bw, no adverse effects and mortality were observed. From the acute oral toxicity test, it can be said that V. tessellate has low toxicity profile.

Phytochemical screening

Phytochemical screening of the leaves extract of V. tessellata confirmed the presence of flavonoids, phenolic compounds, tannins and saponins.

The acetic acid-induced writhing test

The effect of aqueous and methanol extract of V. tessellata leaves on acetic acid induced writhing test in mice was dose dependant (Table 1) and significantly (p < 0.05 – P < 0.01) decreased the number of writhing movements induced by the intraperitoneal administration of the acetic acid comparing with positive control. The highest inhibition of pain exhibited by higher dose 400 mg/kg of aqueous and methanol extract was 42.37% and 45.08% respectively while the standard drug, diclofenac Na, was 54.18% (10 mg/kg).

Table 1 Effect of aqueous and methanol extract of V. tessellata leaves in acetic acid-induced writhing test in mice
Full size table

Hot plate test

The reaction time of aqueous and methanol extract increased in dose dependant manner to the thermal stimuli. The results are shown in Table 2. The higher dose 400 mg/kg of aqueous and methanol extract was demonstrated the highest nociceptive inhibition of thermal stimulus. The maximum reaction time of aqueous and methanol extracts need for the response against thermal stimuli at higher dose was 13.39 ± 0.64 and 12.61 ± 0.32 seconds at 60 and 45 minutes respectively whereas the diclofenac Na (10 mg/kg) was 16.23 ± 1.66 seconds at 60 minutes (p < 0.01).

Table 2 Effect of aqueous and methanol extract of V. tessellata leaves in hot plate test
Full size table

Tail immersion test

The antinociceptive activity of leaves of V. tessellata exhibited in tail immersion test of all two doses significantly increased the latency period of hot water induced thermal stimuli in a dose dependant manner given in Table 3. The highest nociceptive inhibition of thermal stimuli of aqueous and methanol extract at a higher dose 400 mg/kg was 9.91 ± 0.88 and 9.15 ± 1.862 seconds respectively while the inhibition time of nalbuphine was 11.93 ± 1.04 at 10 mg/kg (p < 0.01).

Table 3 Effect of aqueous and methanol extract of V. tessellata leaves in tail immersion test
Full size table

The brine shrimp lethality assay

Cytotoxic effect of the extract is summarized in the Figure 1. The LC50 for methanol and aqueous extract of V. tessellata leaf were found to be 574.32 and 430.41 μg/mL respectively, and that of vincristine sulphate was 0.74 μg/ml.

Figure 1
figure1

Effects of various concentrations of V. tessellata leaves on the viability of brine shrimp nauplii after 24 hrs incubation. VTA = V. tessellata aqueous extract, VTM = V. tessellata methanol extract.

Full size image

Discussion

The present study evaluated the antinociceptive and cytotoxic effects for the first time of aqueous and methanol leaves extract of V. tessellata employing various experimental test models. The study of traditionally used plant species relieving pain should still be seen as a logical research strategy in the search for new analgesic drugs [33, 34].

The intraperitoneal administration of agents provokes a stereotyped behaviour characterised by abdominal contractions and twisting of the dorso-abdominal muscles. This is the advantageous method detecting effects produced by weak analgesics. Writhing test is a non-specific method for evaluation of pain [35]. In this model endogenous mediators such as bradykinin, serotonin and capsaicin generate pain which stimulate peripheral nociceptive neurons by increasing PGE2 and PGF2a [36, 37]. Administration of VTA and VTM exhibited significant (p < 0.05 - p < 0.01) and dose dependent reduction in abdominal contraction compared to control in acetic acid-induced writhing mice. At doses of 200 and 400 mg per kg body weight, the number of writhing, respectively, reduced by 30.77 and 42.37 for VTA, whereas 31.60, and 45.08% for VTM. A standard non-narcotic analgesic drug, diclofenac Na, showed 54.18% inhibition of writhing when administered to experimental animals at doses of 10 mg/kg bw. The extract of V. tessellata may act as an inhibitor of prostaglandin synthesis because the nociceptive mechanism of abdominal writhing induced by acetic acid involves the release of arachidonic acid metabolites via cyclooxygenase (COX), and prostaglandin biosynthesis [38]. Furthermore, different flavonoids also act as antinociceptive and anti-inflammatory agents due to their ability to inhibit arachidonic acid metabolism [39–41]. Preliminary phytochemical screening of V. tessellata qualitatively identified the presence of flavonoids, phenolic compounds, tannins and saponins. Therefore, flavonoids of the plant might be responsible for antinociceptive activity.

Nociceptive reactions towards thermal stimuli using mice investigate both peripheral and central activity for the detection of opioid analgesic as well as several types of analgesic drug from spinal origin [42–44]. The evaluation of VTA and VTM with the hot plate and tail immersion presented the effect of extract that increased the latency time both doses at 200 and 400 mg/kg after 15 and 30 minutes, respectively. The effect of VTA and VTM at 400 mg/kg doses at 60 and 90 min were significant (p < 0.05) in comparison to control while at dose 200 mg/kg showed fitful significant increase in latency. As the hot plate and tail immersion test is a central antinociceptive test, it proves that extract exerts an antinociceptive effect at least one central mechanisms. Therefore, the findings from chemically and thermally-induced nociceptive processes tested in this study shown by VTA and VTM suggest that the extract contains bioactive compound(s) with central and peripheral antinociceptive actions.

Cytotoxicity assay has been considered as pre-screening assay for antimicrobial, antitumor, antimalarial and insecticidal activities. Therefore it is suggested to be a convenient probe for the pharmacological activities of plant extracts [45, 46]. The brine shrimps lethality assay was used to assess the cytotoxicity of leaves of V. tessellata. The LC50 value for the crude extracts was found to be very high signifying that the extract is safe at the therapeutic doses.

Conclusions

Based on obtained results, it can be concluded that V. tessellata leaves possess significant and dose-dependent analgesic activity which was validated by various pain models in this study, and has low cytotoxicity. The results substantiate the ethnomedicinal use of V. tessellata to palliate pain disorders. The findings of present studies warrant further studies for isolation and identification of the responsible bioactive component(s) and to elucidate the mechanism(s) lying with these effects.

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Pre-publication history

  1. The pre-publication history for this paper can be accessed here:http://www.biomedcentral.com/1472-6882/14/464/prepub

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Acknowledgements

We are grateful to the Department of Pharmacy, International Islamic University Chittagong, Bangladesh for permission to use the facilities of Phytochemistry and Pharmacology laboratories for this research work.

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Affiliations

  1. Department of Pharmacy, Faculty of Science and Engineering, International Islamic University Chittagong, 154/A, College Road, Chittagong, 4203, Bangladesh

    M Anisuzzaman Chowdhury, M Masudur Rahman, Mohammed Riaz Hasan Chowdhury, M Josim Uddin & Mohammed Abu Sayeed

  2. Department of Pharmaceutical Chemistry, Faculty of Pharmacy, University of Dhaka, Dhaka, 1000, Bangladesh

    M Aslam Hossain

Authors
  1. M Anisuzzaman Chowdhury
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  2. M Masudur Rahman
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  3. Mohammed Riaz Hasan Chowdhury
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  4. M Josim Uddin
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  5. Mohammed Abu Sayeed
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  6. M Aslam Hossain
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Corresponding author

Correspondence to M Masudur Rahman.

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Competing interests

The authors declare that they have no competing interests.

Authors’ contributions

MAC collected the plant. MAC and MRHC designed and conducted the experiments under the supervision of MMR. MJU and MAS helped to carry out the assay and drafted the manuscript. MMR performed statistical analysis and drafted the manuscript. MAH helped to coordinate the biological assay and checked the final manuscript. All the authors read and approved the final manuscript.

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Chowdhury, M.A., Rahman, M.M., Chowdhury, M.R.H. et al. Antinociceptive and cytotoxic activities of an epiphytic medicinal orchid: Vanda tessellata Roxb.. BMC Complement Altern Med 14, 464 (2014). https://doi.org/10.1186/1472-6882-14-464

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Keywords

  • Antinociceptive
  • Analgesic
  • Tail immersion
  • hot plate
  • Cytotoxicity
  • Vanda tessellata

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