ABSTRACT
Oxidative stress is induced by various pesticides groups. Previous studies suggested that pesticide residues exert oxidative stress as a mechanism of their toxic actions in human or animal’s tissues. The ROS produced by metabolites of pesticides can induce disturbances in the oxidative homeostasis through abnormal redox state and depletion of antioxidant. Further, ROS may impair cellular proteins and DNA, and lead to cytolethality of the cells via disturbance of signaling pathways and inducing apoptosis pathway. Oxidative stress may be created by residues of and can induce multi reproductive organs dysfunction and male disability.
Keywords: Oxidative Stress; Pesticide Residues; Testicular Damage; Male Infertility
Definition of the Oxidative Stress
Oxidative stress creates a disturbance in the systemic activity of reactive oxygen species and in the biological system’s capability to deal with the reactive metabolites or to ameliorate the inducing impairment. Imbalance between the normal redox state of cells may induce hazard effects through the induction of peroxides and free radicals that impair the cell contents, including proteins, lipids, and DNA. Oxidative metabolism may induce basal oxidation, as well as strand breaks in DNA. Reactive oxygen species generated, e.g., O2 − (superoxide radical), OH (hydroxyl radical) and H2O2 (hydrogen peroxide) induced indirect basal damage. In addition, some reactive oxidative species serve as cellular messengers in redox signaling. Though, the normal mechanisms of cellular signaling may be disrupted by oxidative stress [1].
Many Pesticide Residues Have Been Reported to Induce Oxidative Stress in Living Systems
For instance, acetamiprid caused oxidative stress and mitochondrial damage in Leydig cells and increased malondialdehyde and nitric oxide levels in Leydig cells [2]; similarly, thiacloprid also increased oxidative stress [3]. Additionally, carbendazim [4] and chlorpyrifos have been shown to induce oxidative stress by increasing antioxidant enzyme activities and glutathione content and decreasing hydrogen peroxide and lipid peroxidation levels in the hypothalamus, testes and epididymis of treated rats [5]. Furthermore, a mixture of residues (cyhalothrin and imidacloprid) has been shown to induce testicular oxidative stress in adult albino Wistar male rats [6] and to increase testicular malondialdehyde, catalase, superoxide dismutase, and glutathione-Stransferase activities and to reduce testicular glutathione concentrations [7]. Moreover, profenofos has been shown to induce testicular toxicity in mature male rats [8]. Cypermethrin induced oxidative stress and spermatogonial germ cell apoptosis in rats [9]. Similarly, DDT induced testicular oxidative stress in adult rats and increased lipid peroxidation and metallothione in levels, superoxide dismutase catalase activity, and hydrogen peroxide production [10]. Diazinon has been shown to induce oxidative stress by reactive oxygen species, which may be the reason for sperm DNA fragmentation [11].
Dimethoate has been shown to increase the level of lipid
peroxidation and to decrease the activities of antioxidant enzymes
in the testes of rats [12]. Endosulfan isomers (α endosulfan, β
endosulfan and endosulfan sulfate) changed the levels of metabolites
involved in energy metabolism and oxidative stress, and these were
associated with an imbalance in sex sterol hormone synthesis [13].
Glyphosate, an herbicide residue, decreased glutathione levels
and superoxide dismutase activity in the testicular tissue of rats
[14]. Similarly, exposure to 2,4-dichlorophenoxyacetic acid has
been shown to induce oxidative stress and apoptosis in mouse
testes [15]. A mixture of glyphosate and zineb produced severe
oxidative stress in testicles by affecting the antioxidant contents
[16]. Hexa-chloro-cyclohexane elicited a significant decrease
in the activities of cytosolic superoxide dismutase and catalase
and ascorbic acid content together with an increase in the levels
of lipid peroxidation and hydrogen peroxide [17]. It has been
shown that imidacloprid reduced antioxidant activities, increased
malondialdehyde content and elevated protein oxidation product
levels, with severe histopathological alterations, in rat testes [18]. A
mixture of lambda-cyhalothrin and imidacloprid has been shown to
increase thiobarbituric acid reactive substance levels, to decrease
glutathione levels and to inhibit catalase and superoxide dismutase
in Wistar male rats [19].
This evidence shows the potential risk of male infertility. These
impairments testicular damage include the following:
a) Mitochondrial damage in Leydig cells caused by acetamiprid
[20], clothianidin [21], cypermethrin [22], carbendazim [23],
DDVP damage also is caused in Sertoli cells and germ cells of
male rats by 2,4-D [24] and carbofuran [25] and in testicular
tissues, reducing the diameter of the seminiferous tubules
and number of spermatogonia, primary and secondary
spermatocytes and spermatids, as caused by chlordane [26].
b) DNA damage in sperm cells in male mice has recently been
shown to be caused by chlorpyrifos [27], glyphosate. [28] α-
cypermethrin, and imidacloprid [29].
c) Oxidative damage of the testes and testicular tissues in male
rats caused by imidacloprid [30] and in the testes of lizards
[31]. Moreover, herbicide residues have been shown to create
similar effects were observed among farmers in rural area in
Malaysia [32]. These herbicides are glyphosate [33], and 2,4-D.
The exposure to chloropyrifos induces depletion in antioxidant
defense systems in the testes This effect may lead to disruption
in the functional integrity of cell organelles Figure 1 from
pervious ours.
d) Necrosis, edema and cellular damage in testicular tissues of
rats have been caused by dichlorvos [34].
e) Severe seminiferous tubule degeneration in rats has been
caused by dimethoate, malathion and hexachlorocyclohexane.
The prolonged exposure to mancozeb fungicide altered the
male rabbit’s reproductive abilities and inducing oxidative
stress in testicular homogenate. Disruption of the germinal
epithelium with vacuolization of Leydig cells and reduced
spermatogenic cells Figure 2 from pervious our work.
Conclusion
Several pesticide residues can create oxidative stress that may result in dysfunction in testicular cell organelles and altered male reproductive abilities. This evidence shows the potential risk of pesticide residues to induce male infertility.
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