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Enzymes of Earthworm as Indicators of Pesticide Pollution in Soil

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DOI: 10.4236/aer.2016.44011    1,734 Downloads   3,142 Views   Citations

ABSTRACT

The importance of the earthworms in the agricultural practices is well known. The increasing applications of pesticides and chemicals in the agricultural farms have adversely influenced the flora and fauna of the soil. Earthworms which immensely contribute in increasing the quality and fertility of agricultural soil are reported be worst hit organisms under such conditions. Recent reports have indicated growing interests among researchers to explore biochemical and molecular markers as indicators of accumulation of pollutants in the soil in general and pesticides in particular. The varying levels of several biomolecules in different parts of the earthworm have been reported which are indicative of sensitivity of the organisms to different xenobiotics. However, the existing information lacks the literature displaying stock of information regarding the impact of pesticides on the levels of some key enzymes regulating many crucial functions in the earthworm at one place. Keeping in view this issue, it was envisaged to bring out a mini review which illustrates updated information available on the impact of pesticides on the activities of certain key enzymes reported to be responsible for catalysing metabolic pathways concerning the neurotransmission system, energy metabolism, oxidative stress and amino acids metabolism in different body parts of the earthworms, a prospective bioindicators of pesticides contamination in the soil.

1. Introduction

It is of utmost importance to understand as how to achieve sustainable agriculture by knowing the impact of various contaminants in the soil as well as of different agricul- tural practices on soil ecosystems as such [1] . Now-a-days, the chemical compounds such as pesticides and fertilizers are frequently used and its excess use leads to soil, sur- face and ground water pollution that affect target organisms along with non-target or- ganisms like earthworms. Earthworms are frequently available in a broad range of soil and may deposit 60% - 80% of the total soil biomass [2] [3] . They are the indispensable species in the terrestrial ecosystem which significantly influence the various processes like soil formation, organic matter breakdown, decomposition activity and nutrient cy- cling mineralization [4] [5] .

The frequent applications of pesticides have been found to exert adverse effects on the soil development and its functioning in an ecosystem [5] . Earthworms act as bioindicator species for the ecotoxicological analysis of pesticide soil pollution [6] [7] [8] . According to a report, pesticides have detrimental effects on earthworm at various levels of organisation which involves change in the behaviour, defile metabolism and enzymatic functioning, enhance mortality, diminish fertility, hamper growth and reproduction [9] . In past and even recently, various reviews have been published on the toxic effects of pesticides on the earthworms [10] [11] .

A biomarker has been defined as a biochemical, cellular, physiological or behavioural alterations that can be evaluated through a portion of tissue or fluid samples or whole individual, for the assessment of exposure and/or impact from one or more toxicants [12] . The biochemical biomarkers are being utilized these days for the analysis of pollutant toxicity, metabolization and detoxification in earthworm [13] [14] which later can be used for the detection and assessment of contaminant that influence the environmental modifications [15] .

Biomarkers render evidence for the exposure or effect of pollutants on the fauna of soil which can be utilized for the assessment of pollution in environmental monitoring. Selection of biomarker is done on the basis of various criteria whether it is sensitive, acts in a dose-time dependent manner to the toxicant [16] , its biochemical memory and whether its erratic response due to natural variation is known that includes temperature, sex, age, weight [17] .

Earthworms play crucial role in soil ecosystem as it helps in maintaining soil structure and fertility [4] . They influence the organic matter dynamics, structure and microbial community [18] [19] [20] and hence are referred as Ecosystem engineers [21] . It has also been explained as how they enhance the soil porosity by modifying soil organic matter chemically as well as physically by mixing leaf litter with soil resulting in formation and stabilization of soil aggregates [22] [23] . Keeping in view the lack of information on the effect of xenobiotics on different biochemical and molecular indices of the earthworm, it has been endeavoured in the this mini review to present an updated information on the impact of pesticides and other xenobiotics on the enzymes from earthworms which could be of great use to those involved in soil remediation and sustainable agriculture.

2. Enzymes as Biomarkers in Earthworm

The utility of biomarkers in earthworm is gradually relevant for the assessment of impact of pesticide in soil organism. Various classes of enzymes are used as biomarkers due to their crucial role in the neurocholinergic transmission and in cell homeostasis preventing toxic action of chemicals [24] [25] [26] . Dimethoate, an organophosphate pesticide, has been reported to exert toxic effects on the profiles of protein and the cellular enzyme system as well as the testicular histomorphology of Eisenia kinneari [27] [28] [29] .

2.1. Acetylcholinesterase in Earthworms

Acetylcholinesterase (AChE) is considered as the main cholinesterase in earthworms [30] [31] . In few earthworm species, its activity is reported and biochemically characterised [32] . It is a significant enzyme that play crucial role in the transmission mecha- nism of nervous system. The neurotransmission takes place at cholinergic synapses by rapid hydrolysis of acetylcholine (neurotransmitter) to choline and acetate [33] . Or- ganophosphorus and carbamate pesticides mainly inhibit AChE. Pesticide particularly, organophosphorus inhibit the acitivity of enzyme by covalently phosphorylating the serine residue within the active site group.

It has been reported that the concentration of AChE activity was highest in the pre- clitellar part of earthworm and has important role in the functioning of dorsal brain present near prostomium [30] [34] . A time-dependent inhibition of AChE is found in Eisenia fetida, when exposed to two organophosphates, chlorpyriphos and azodrin, in the standardized paper contact test [35] [36] . The exposure of Eisenia fetida to carbamate pesticide, methiocarb, has been demonstrated to cause strong inhibition of AChE activity [37] [38] .

2.2. Gamma Amino Butyric Acid (GABA) Amino Tranferase

The GABA is a universal inhibitory neuromuscular transmitter in most of the invertebrates [39] . The site of action of this neurotransmitter is at both the neuromuscular junctions and within the ganglia. It is known that the major target of cypermethrin, class II-pyrethroids, is GABA that regulates the chloride channels [40] . According to a report, the open state of voltage gated chloride channels is suppressed and GABA de- pendent uptake of chloride ions is inhibited by cypermethrin [41] . This pesticide leads to generate neurotoxicity by modulating the levels of GABA. The results of a recent study have shown that this pesticide results into reduction in the GABA level [42] , which indicates that GABA may act as a sensitive biomarker to cypermethrin exposure in earthworms. The effect of cypermerthrin in brain of earthworm has been shown to be mediated via inhibition of activity of AChE involved in cholinergic neurotransmis- sion system.

2.3. Antioxidant Enzymes

The exposure to pesticides induces oxidative stress through generation of reactive oxygen species (ROS) [43] . The production of ROS leading to oxidative stress has gained importance and has generated great interest in the field of ecotoxicology [44] . Oxidative stress may be defined as the imbalance between the oxidative as well as the antioxidative indices in the living systems. Interaction of these ROS with the essential macromolecules such as DNA, protein and lipids may cause disturbance in the physiological processes [45] . Toxicity induced by pesticides involves lipid peroxidation [46] . The treatment of earthworms with the pesticides and heavy metals leads to the production of ROS (H2O2 and OH radicals) [47] . The cells are known to defend themselves from the oxidative damage using antioxidative enzymes and glutathione as they act as scavengers of ROS. The major enzymatic antioxidants in response to oxidative stress are: SOD, as catalase, glutathione peroxidase and glutathione reductase. In order to prevent the oxidative damage, SOD metabolizes the superoxide anion () into mo- lecular oxygen and H2O2, which is then deactivated by catalase. In cellular protection, glutathione reductase plays key role by reducing glutathione in the oxidised form (GSSG) to GSH (reduced and active form) [48] .

2.4. Glutathione-S-Transferase (GST)

Glutathione-S-Transferase (GST), a cytosolic enzyme, plays a crucial role in the detoxification and biotransformation of a number of electrophilic compounds by consumption of glutathione. The exposure of pesticides may lead to the alterations in the enzymatic activities that reflects the metabolic disturbances and cell damage in the specific tissues [31] [49] . Increased level of GST may result into better protection against toxic effects of pesticides and hence can be used as biomarker for monitoring pollution [50] . GSTs neutralise a wide range of pesticides and endogenous metabolic by-products through enzymatic f glutathione conjugation, glutathione-dependent peroxidase activity or isomerisation reactions [51] . The reports from different workers have shown the sensitivity of earthworm GST to the heavy metals and the pesticide exposure [52] [53] [54] [55] [56] . Earthworm, Lumbricus rubellus, possess a range of GSTs related to those from other taxa like nematodes and humans, with the evidence of tissue specific isoforms, activity, location, the ability to detoxify products of cellular toxicity and potential response to pollution [57] .

2.5. Gut Enzymes of Earthworm

The existing information indicate that the microflora dwelling in the gut of the earthworm and the enzymes present there in such as cellulase, amylase, endoglucanase, pectinase, acid phosphatase, alkaline phosphatase and nitrate reductase have the ability to degrade the complex organic molecules (cellulose, pectin, etc.) in soil to their relatively simpler forms. Exposure of worms to deltamethrin causes reduction in cellulase activity, while exposures to lindane increased its activity. These results indicate the harmful effect of deltamethrin and the inducing effects of lindane on the biochemical metabolism of earthworms [58] . The acute exposure with these two pesticides, however, has been found to be lethal to the earthworms [58] . The presence of high activity of cellulase in the posterior region of the gut of the earthworms helps in digestion of complex plant carbohydrates and generation of energy [59] . Assays of the enzymes amylase, cellulase, invertase and pectinase from the gut of E. eugeniae revealed that their production was reduced in the fipronil mixed with soil as compared to that of control [60] . The carboxylesterases (CbEs) are serine hydrolases and they are involved in the detoxi- fication of complex organic materials in soil. The CbE is secreted by earthworm in their gut lumen. In Lumbricus terrestris, chlorpyrifos (OP) has been shown to significantly inhibit the CbE activity [61] .

3. Enzymes of Carbohydrate Metabolism in Earthworms

3.1. Lactate Dehydrogenase (LDH)

The lactate dehydrogenase (LDH) is a key glycolytic enzyme that is found in almost all the tissues of the earthworms [62] [63] . This enzyme has been used as an indicator of exposure to stress [64] . To assess toxicity of any xenobiotics including the pesticides and the heavy metals as well as the diagnosis of cell, tissue and organ damage, LDH has been widely exploited in the vertebrates. However, in the invertebrate toxicity tests, the potential of this enzyme as indicator is rarely explored [65] [66] [67] .

3.2. Malate Dehydrogenase (MDH)

Malate is formed when cytosolic NADH is oxidised during reduction of oxaloacetate by the action of cytosolic MDH. Then, malate enters mitochondria by a carrier and is oxi- dised into oxaloacetate by the action of mitochondrial MDH. Malate is an important intermediate of TCA cycle. MDH catalyzes the interconversion of oxaloacetate to malate for energy requirements. In the present study, elevated levels of malate are ob- served in earthworms exposed to cypermethrin, in comparison to control earthworms. It may be due to the high energy requirement of earthworms under stress conditions caused by cypermethrin exposure [42] .

4. Enzymes of Amino Acid Metabolism in Earthworms

Exposure of deltamethrin in Metaphire posthuma has been shown to affect the glucose and nitrogen metabolism pathway by inhibition of chief enzymes involved in the pathway: glutamine synthatase, glutamic acid decarboxylase, Acyl CoA synthase [42] .

Scheme 1. A flow chart showing effect of soil pollutants on biochemical indices of the earthworms.

Table 1. Enzymes of earthworms as biomarkers of pesticide toxicity.

The list of different enzymes responding to the pesticide stress in the earthworms have been summarised in the Table 1. A flow chart showing effect of soil pollutants on varying biochemical indices of the earthworms is displayed in Scheme 1.

5. Conclusion

There is growing interest on the studies concerning to monitoring or evaluation of the impact of pesticides and heavy metals on the activities of some key enzymes from different tissues in the earthworms to exploit them as potential indicators of xenobiotics contamination in the soil. The information available regarding the impact of pesticides on different species of earthworm indicated that the pesticide induced alterations in the functions of some key enzymes regulating the neurotransmission system, energy me- tabolism, oxidative system and amino acid metabolism of the worm. It was observed

that these enzymes could serve as potential indicators of pesticide toxicity. However, still lot more is required to be done to find out more sensitive biomarkers from the earthworms to be used as specific indicator of the soil pollutants. The information may help farmers as well as the policy makers to formulate and manage better farming practices avoiding excess soil contamination with pesticides as it may significantly reduce

the earthworm population in soil.

NOTES

#Authors equally contributed.

Conflicts of Interest

The authors declare no conflicts of interest.

Cite this paper

Tiwari, R. , Singh, S. , Pandey, R. and Sharma, B. (2016) Enzymes of Earthworm as Indicators of Pesticide Pollution in Soil. Advances in Enzyme Research, 4, 113-124. doi: 10.4236/aer.2016.44011.

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