Indan Journal of Medical Research Indan Journal of Medical Research Indan Journal of Medical Research Indan Journal of Medical Research
  Home About us Editorial board Search Ahead of print Current issue Archives Submit article Instructions Subscribe Contacts Login  
  Home Print this page Email this page Small font sizeDefault font sizeIncrease font size Users Online: 1979       

   Table of Contents      
COMMENTARY
Year : 2012  |  Volume : 136  |  Issue : 1  |  Page : 10-12

Green medicine as a harmonizing tool to antivenom therapy for the clinical management of snakebite: The road ahead


Department of Molecular Biology & Biotechnology, Tezpur University, Tezpur 784 028, Assam, India; School of Biological Sciences, University of Northern Colorado, Greeley, CO, USA

Date of Web Publication10-Aug-2012

Correspondence Address:
Ashis K Mukherjee
Department of Molecular Biology & Biotechnology, Tezpur University, Tezpur 784 028, Assam, India; School of Biological Sciences, University of Northern Colorado, Greeley, CO, USA

Login to access the Email id

Source of Support: None, Conflict of Interest: None


Rights and PermissionsRights and Permissions

How to cite this article:
Mukherjee AK. Green medicine as a harmonizing tool to antivenom therapy for the clinical management of snakebite: The road ahead. Indian J Med Res 2012;136:10-2

How to cite this URL:
Mukherjee AK. Green medicine as a harmonizing tool to antivenom therapy for the clinical management of snakebite: The road ahead. Indian J Med Res [serial online] 2012 [cited 2019 Dec 12];136:10-2. Available from: http://www.ijmr.org.in/text.asp?2012/136/1/10/99551

Snakebite is declared as a "Neglected Tropical Disease" by the World Health Organization. As a result, this may be considered as a matter of global health concern for the people in general and the rural communities of the developing countries in particular. The reasons for the dearth of true statistical data on epidemiology of snakebite, particularly from some of these countries are mainly due to the lack of properly co-ordinated epidemiological survey programme. Therefore, the published data on snakebite based on hospital records were biased and did not reflect the true magnitude of the problem. Snakebite data based on diverse methodologies show that global incidence of snakebite is around 5,400,000 bites per year leading to over 2,500,000 envenoming and around 125,000 fatal cases annually [1] . As a result, snake envenomation warrants urgent medical attention and must be considered as a severe health issue.

India has rich assortment of snake fauna, of which only 242 species have been identified including 57 poisonous or harmful species. The four major species of venomous snakes ubiquitous in India know as "Big four" are considered responsible for life-threatening envenomation around the country. These include- Indian cobra (Naja naja), the common krait (Bungarus caeruleus), the Russell's viper (Daboia russelii) and the sawscaled viper (Echis carinatus). Although many other species of venomous snakes, for example, Indian Banded Krait (Bungarus fasciatus), Naja kaouthia, N. oxiana, N. sagittifera, Echis sochureki, Hypnale hypnale, are also responsible for fatal and/or mild envenomation in different parts of India [2],[3] , yet less attention has been paid in the supervision of snakebite wreaked by these neglected species of venomous snakes.

Snake venom, which is produced in a specialized salivary gland of the venomous snakes known as venom gland, contains numerous enzymatic and non-enzymatic proteins and toxins responsible for imparting toxicity in victims post-envenomation. Activity and number of enzymes present in snake venom vary from venom to venom. Elapidae venoms are rich in phospholipases, phosphodiesterase, nucleotidase, ATPase and cholinesterase [2],[4] whereas Russell's viper and pit viper venoms contain proteases, coagulant, kinin-releasing and argininester hydrolyzing enzymes [5] . Many non-enzymatic toxins such as neurotoxin, cardiotoxin, myotoxin, and three-finger family of proteins present in snake venom also play an important role in venom toxicity.

The most effective and accepted therapy for snakebite patients is immediate administration of specific or polyvalent antivenom following envenomation. Unfortunately, this therapy carries an associated risk of anaphylaxis and serum reactions. Further, due to geographical variation in venom composition of snake, antivenom raised against the venom of a snake from a particular geographical origin may not be able to neutralize or prevent local effects of envenomation by snakes from other geographical locations [2],[4] . Scarcity of sufficient amount of quality venom from authorized venom dealers also poses a challenge for a reasonable amount of antivenom production to meet the national requirement. Another problem encountered with the antivenom therapy is its failure to neutralize the low molecular weight, less immunogenic toxic components of the venom which cause local haemorrhage, necrosis and tissue damage in snakebite victims. In short, due to complex interplay of economic, epidemiological, therapeutic efficacy and safety issues of antivenom, the mortality of snakebite remains incongruously high in the developing countries. This propels that this problem must be re-addressed.

From the ancient days, human beings have explored many plants as a source of medicine to cure diseases and various ailments. In fact, abundant plant species are used as folk medicine to treat poisonous snakebite all over the world. Ironically, in most of the cases these species are used without proper scientific validation. In India, about 50 such plants have been indexed [6] and many others (not included) have also been widely used against snakebite by villagers, snake charmers and traditional healers.

The limitations of antivenom therapy have prompted the scientists to explore the therapeutic use of natural products derived from plants or from other natural sources for the treatment of snakebite patients. However, questions have been raised on the validity of such treatments and, therefore, pharmacological reassessment of medicinal plants must be done very carefully and critically prior to their application as antidote for snakebite. During the recent years more attention has been paid to the ethnobotanical survey and pharmacological screening of medicinal plants traditionally used for the treatment of snakebite patients as well as isolation and characterization of active compounds possessing anti-ophidian property from natural resources.

A few of the well characterized active molecules from plants possessing antivenom activity and/or able to neutralize toxic enzymes of venoms include aristolochic acid from the medicinal plant Aristolochia radix[7] , 2-hydroxy-4-methoxy benzoic acid and lepuol acetate from Hemidesmus indicus R. Br [8] , AIPLI purified from methanolic leave extract of Neem, Azadiracta indica[9] , isoquinoline alkaloid from a herbaceous plant Cardiospermum halicacabum[10] , etc.

In this issue, Gomes et al[11] have demonstrated the efficacy of three synthetic herbal compounds viz. 2-hydroxy-4-methoxy benzoic acid (BA), p-anisic acid (PA) and salicylic acid (SA) in neutralizing the pathophysiological action of phospholipase A 2 (PLA 2 ) purified from Bungarus fasciatus (Indian Banded Krait). These compounds were found to neutralize the krait venom PLA 2 induced toxic effects with a variable extent [11] . However, the synthetic herbal compounds were found to be superior to the commercial polyvalent snake venom antiserum in neutralizing the toxic effect of tested PLA 2 . The authors have concluded that in case of banded krait envenomation the combination therapy with the right choice of herbal antagonist and commercial polyvalent snake venom antiserum may provide better management against this snakebite [11] .

Though many of the active plant constituents are promising contenders for the development of antivenom drug molecules in future, a single purified compound may not be sufficient to completely neutralize the toxic effect of snake venom. Therefore, pre-clinical studies to evaluate the antivenom activity of suitable herbal formulation(s) containing different combinations of these active molecules are essential. Moreover, considering the fact that plant derived secondary metabolites may not necessarily be benign molecules, assessment of bio-safety and in vivo toxicity of the anti-ophidian herbal formulation(s) must be addressed before advocating their safe therapeutic application in the clinical management of snakebite patients.

It is well understood now that development of green medicine for snakebite is a challenging task. Nonetheless, it is not an unworkable goal. To achieve this target, the scientists, clinicians, NGOs and government agencies must work coherently with a common objective to produce efficient and safe herbal medicine for snakebite treatment. Further studies should involve region-specific extensive ethnobotanical survey of our natural resources and creation of database of plants used as antidote for snakebite in ethno-medicinal practice. It is quite obvious that the high market demand of such plant derived medicines will build a pressure on our natural resources that might lead to the habitat loss, habitat degradation, and over harvesting of these medicinal plants resulting in a threat to our biodiversity. Hence, a well thought road map should be designed for the proper consumption as well as maintenance of our valuable natural resources. This in turn, will not only provide affordable and effective plant based curative molecule(s) for snakebite treatment but will preserve our indigenous knowledge as well.

 
   References Top

1.Kasturiratne A, Wickremasinghe A, de Silva N, Gunawardena NK, Pathmeswaran A, Premaratna R, et al. The global burden of snakebite: a literature analysis and modeling based on regional estimates of envenoming and deaths. PLoS Med 2008; 5 : 1591-604.  Back to cited text no. 1
    
2.Mukherjee AK, Maity CR. Biochemical composition, lethality and pathophysiology of venom from two cobras-Naja naja and N. kaouthia. Comp Biochem Physiol 2002; 131 : 125-32.  Back to cited text no. 2
[PUBMED]    
3.Simpson ID, Norris RL. Snakes of medical importance in India: Is the concept of the ''Big 4'' still relevant and useful? Wilderness Environ Med 2007; 18 : 2-9.   Back to cited text no. 3
[PUBMED]    
4.Mukherjee A, Maity, CR. The composition of Naja naja venom samples from three districts of West Bengal, eastern India. Comp Biochem Physiol 1998; 119A : 621-7.  Back to cited text no. 4
    
5.Mukherjee AK, Ghosal SK, Maity CR. Some biochemical properties of Russell's viper (Daboia russelli) venom from eastern India: correlation with clinico-pathological mani-festation in Russell's viper bite. Toxicon 2000; 38 : 163-75.  Back to cited text no. 5
    
6.Biswas K, Ghosh E. In: Bharatio Banoshadi. Kolkata: Calcutta University Press; 1977.  Back to cited text no. 6
    
7.Vishwanath BS, Kini RM, Gowda TV. Characterization of three edema-inducing phospholipase A 2 isoenzymes from Habu (Trimeresurus flavoviridis) venom and their interaction with the alkaloid aristolochic acid. Toxicon 1987; 25 : 501-15.  Back to cited text no. 7
[PUBMED]    
8.Alam MI, Gomes A. Adjuvant effects and antiserum action potentiation by a (herbal) compound 2-hydroxy-4-methoxy benzoic acid isolated from the root extract of the Indian medicinal plant "Sarsaparilla" (Hemidesmus indicus R. Br.). Toxicon 1998; 36 : 1423-31.  Back to cited text no. 8
    
9.Mukherjee AK, Doley R, Saikia D. Isolation of a snake venoms phospholipase A 2 (PLA 2 ) inhibitor (AIPLAI) from leaves of Azadirachta indica (Neem): mechanism of PLA 2 inhibition by AIPLAI in vitro condition. Toxicon 2008; 51 : 1548-53.  Back to cited text no. 9
    
10.Chandra DN, Prasanth GK, Singh N, Kumar S, Jithesh O, Sadasivan C, et al. Identification of a novel and potent inhibitor of phospholipase A 2 in a medicinal plant: Crystal structure at 1.93 Å and surface plasmon resonance analysis of phospholipase A 2 complexed with berberine. Biochim Biophys Acta 2011; 1814 : 657-63.  Back to cited text no. 10
[PUBMED]    
11.Gomes A, Bhattacharya S, Mukherjee S, Tsai IH, Gomes A. Inhibition of toxic actions of phospholipase A 2 isolated & characterized from the Indian Banded Krait (Bungarus fasciatus) venom by synthetic herbal compounds. Indian J Med Res 2012; 136 : 40-5.  Back to cited text no. 11
    




 

Top
 
 
  Search
 
    Similar in PUBMED
   Search Pubmed for
   Search in Google Scholar for
    Access Statistics
    Email Alert *
    Add to My List *
* Registration required (free)  

 
  In this article
    References

 Article Access Statistics
    Viewed892    
    Printed36    
    Emailed0    
    PDF Downloaded259    
    Comments [Add]    

Recommend this journal