OXIDATIVE STRESS AND BIOCHEMICAL CHANGES INDUCED BY ...
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Keshta et al. World Journal of Pharmacy and Pharmaceutical Sciences
OXIDATIVE STRESS AND BIOCHEMICAL CHANGES INDUCED BY
THIAMETHOXAM AND ACETAMIPRID INSECTICIDES IN RATS
Akaber T. Keshta1*, Ahmed A. Hataba
2, Hala M. I. Mead
3 and Nouran M. El-Shafey
3
1Biochemistry Division, Chemistry Department, Faculty of Science, Zagazig University,
Egypt.
2Organic Chemistry Division, Chemistry Department, Faculty of Science, Zagazig
University, Egypt.
3Pest Physiology Department, Plant Protection Research Institute, Agricultural Research
Center, Egypt.
ABSTRACT
Thiamethoxam (THIA) and Acetamiprid (AC) are neonicotinoid
insecticides used for pest control. They have potential toxicity to
mammals. The present study aimed to determine the oxidative stress of
THIA and AC in plasma and investigate the effect of them on heart,
brain and testis tissues in rats. Male albino rats weighing 90-110 g
were used. They were divided into 3 groups: negative control, THIA
and AC groups. THIA group was received THIA insecticide and AC
group was received AC insecticide at 1/10 LD50 of both insecticides by
oral administration. Our results demonstrated that THIA and AC
induced antioxidant, biochemical and histopathological alterations at
tested periods 10, 20 and 30 days. They significantly increased the
levels of malondialdehyde (MDA) and nitric oxide (NO), but they significantly decreased the
activities of catalase (CAT) and superoxide dismutase (SOD) at 10, 20 and 30 days
respectively (p<0.001). They significantly elevated the concentrations of total cholesterol and
triglycerides (TG). Also, these insecticides significantly increased the activities of lactate
dehydrogenase (LDH) and creatine kinase (CK-MB), whereas they significantly reduced
acetylcholinesterase (AChE) activity and testosterone level at the same periods respectively
(p<0.001). Moreover, THIA and AC prompted several changes in histopathological
examinations of heart, brain and testis compared to negative control group. This study
concluded that THIA and AC could stimulate oxidative toxicity, cardiotoxicity, neurotoxicity
WORLD JOURNAL OF PHARMACY AND PHARMACEUTICAL SCIENCES
SJIF Impact Factor 6.041
Volume 5, Issue 6, 44-60 Research Article ISSN 2278 – 4357
*Corresponding Author
Dr. Akaber T. Keshta
Biochemistry Division,
Chemistry Department,
Faculty of Science,
Zagazig University,
Egypt.
Article Received on
14 March 2016,
Revised on 13 April 2016,
Accepted on 04 May 2016
DOI: 10.20959/wjpps20166-6837
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Keshta et al. World Journal of Pharmacy and Pharmaceutical Sciences
and reproductive toxicity. Furthermore, the toxic effects of THIA may be more than AC on
plasma, heart, brain and testis. So, neonicotinoids should be used in agriculture applications
for a planned system.
KEYWORDS: Thiamethoxam, Acetamiprid, rats, oxidative stress, biochemical changes,
histopathological changes.
INTRODUCTION
Neonicotinoids are neuro-active insecticides. Their chemical structure is linked to nicotine.
They are the most used class of insecticides in the world. These insecticides are divided into
two types: N-nitroguanidines (imidacloprid, thiamethoxam, dinotefuran and clothianidin) and
N-cyanoaminides (acetamiprid and thiacloprid). They bind to nicotinic acetylcholine
receptors (nAChRs) and affect on the initiation of the electrical signal in the postsynaptic
neuron in sucking pests. The presence of an electron-withdrawing group, like cyano or nitro
group, is a vital structural of these insecticides and proposes to contribute to their selectivity.
These insecticides display selective toxicity for insects rather than for mammals. This
selectivity is responsible for reducing neonicotinoid mammalian toxicity.[1]
Thiamethoxam (THIA) has a systemic action for crop protection. It is highly effective for
whiteflies, thrips and pests of cotton and fruits. THIA metabolism has shown that its ‘magic
nitro group’ is transformed to produce nitrosoguanidine, aminoguanidine, guanidine and urea
derivatives. The mode of action can be depended on cell necrosis, apoptosis and an increase
in cell replication rate.[2]
Acetamiprid (AC) is very operative for aphids, leafhopper and pests of leafy vegetables. The
selectivity of AC is due to the electronegative nature of nitroguanidine, nitromethylene and
nitroamine which bind with an exact subsite in nAChRs. The metabolites could be considered
as an inhibitor of inducible nitric oxide synthase (iNOS).[3]
Certain neonicotinoids are connected to oxidative stress by the generation of free radicals.[4]
Furthermore, these insecticides may be prompted adverse effects on many organs such as
brain[5]
, testis[6]
and heart.[7]
Rats are considered deadly pests causing extensive food losses
and rapid distribution of many diseases.[8]
According to this study, THIA and AC may produce oxidative stress in plasma. They could
prompt several changes in the biochemical parameters and the histopathological studies in
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heart, brain and testis tissues. Additionally, the bad effects of THIA may be more than AC on
plasma, heart, brain and testis in rats.
MATERIALS AND METHODS
Chemicals
Two used neonicotinoid insecticides: 1- Thiamethoxam insecticide (THIA) (PILOT 25%) is a
water soluble yellowish white crystalline powder. Its chemical name is: {3-[(2-chloro-5-
thiazolyl)methyl] tetrahydro-5-methyl-N-nitro-4H-1,3,5-oxadiazin-4-imine}. It was
purchased from ROTAM AGROCHEMICAL CO LTD-HONG KONG. 2- Acetamiprid
insecticide (AC) (MOSPILAN 20%) is a water soluble light blue fine powder without any
odor. Its chemical name is: ((E)-N1-[(6-chloro-3-pyridyl) methyl]-N2-cyano-N1-methyl
acetamidine). It was purchased from SUMITOMO CORPORATION SUMITOMO
CORPORATION under license of NIPPON SODA CO., LTD- TOKYO- JAPAN.
Determination of the median lethal dose (LD50) of AC
Acute toxicity study was determined according to the method of the Organization of
Economic Co-operation and Development guidelines by oral administration in male rats to
identify LD50 of AC.[9]
Animals and Experimental design
A total of 42 male Swiss adult albino rats weighing 90-110g were used in this study and
allowed one week for acclimatization prior to start of the experiment. They were housed in
the experimental animal house of the Faculty of Science, Zagazig University, Egypt. The
animals were maintained in the controlled environment of (temperature, humidity and light)
and fed on a commercial standard diet and tap water ad libitum.
The rats were divided into 3 groups as follows: 1- Negative control group: This group
comprised 6 rats. They were fed on normal diet and drunk normal water along period of the
experiment. 2- THIA group: This group comprised 18 rats. They were received THIA
insecticide orally at dose 156 mg/Kg body weight (1/10 oral LD50) dissolved in tap water
every day along 30 days.[10]
3- AC group: This group comprised 18 rats. They were received
AC insecticide orally at dose 100 mg/Kg body weight (1/10 oral LD50) dissolved in tap
water[11]
every day for 30 days.
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Sampling
The rats were scarified [2 rats from (negative control group) and 6 rats from (THIA and AC
groups) at 10, 20 and 30 days] after fasting 12 hours. Blood samples (serum and plasma)
were collected for antioxidant and biochemical studies at each period. Also, tissues (heart,
brain and testis) were collected for histopathological studies at each period.
Biochemical studies
Determination of MDA, NO, CAT and SOD assays
Plasma samples were prepared for malondialdehyde (MDA), nitric oxide (NO), catalase
(CAT) and superoxide Dismutase (SOD) assays according to the methods of Satoh[12]
,
Montgomery and Dymock[13]
, Aebi[14]
and Nishikimi et al.[15]
; respectively.
Determination of heart function tests
Serum samples were performed for heart function tests [lactate dehydrogenase (LDH) and
creatine kinase (CK-MB)] enzymes by using Bio-diagnostic kit methods according to the
methods of Pesce[16]
and Wu and Bowers[17]
; respectively.
Determination of total cholesterol and triglycerides
Serum samples were collected for total cholesterol and triglycerides (TG) tests by using Bio-
diagnostic kit methods according to the methods of Young[18]
and Stein[19]
; respectively.
Determination of AChE enzyme and testosterone ELISA
Acetylcholinesterase (AChE) and testosterone ELISA tests were estimated by using the
methods of Ellman et al.[20]
and Granoff and Abraham[21],
respectively in serum samples.
Histopathological examinations
Histopathological examinations were performed on the portion of the heart, brain and testis
tissues. The specimen were fixed in 10% formalin and embedded in paraffin wax. Heart,
brain and testis sections were cut at 5µm in thickness, stained with Hematoxylin and Eosin
(H&E.,) viewed light microscopy and examined histopathological changes according to
Lillie.[22]
Statistical analysis
The obtained data were evaluated by "SPSS" 14.0 for Microsoft Windows, SPSS Inc.[23]
The
values were expressed as mean±SD. The levels of markers were analyzed by one way
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analysis of variance (ANOVA) and Dunnett's tests then followed by least significant
difference (LSD).
RESULTS
Acute toxicity study
The acute toxicity was estimated to determine LD50 of AC. Our results indicated that a dose
up to 500 mg/kg was considered to be safe, where no mortality was observed. The results
found that LD50 of AC= 1000 mg/kg body weight. Also, the oral LD50 value of THIA
was1563mg/kg that previously was measured. So, the used dose was 100 mg/kg body weight
of AC and 156 mg/kg body weight of THIA (1/10 LD50 of THIA and AC) in this study.
Biochemical studies
Determination of MDA, NO, CAT and SOD in plasma
THIA and AC significantly increased the levels of MDA and NO compared to negative
control group 18.73±1.36 (nmol/ml) and 26.51±2.34 (µmol/ml), but they significantly
reduced the activities of CAT and SOD compared to negative control group 238.15 ±10.63
(U/L) and 269.65±12.22 (U/L) after 10, 20 and 30 days; respectively, (p<0.001).The
alterations of THIA group were more than AC group, [Table 1].
Table: 1. Effects of THIA and AC on malondialdehyde (MDA), nitric Oxide (NO) levels,
catalase (CAT) and superoxide dismutase (SOD) activities at 10, 20, 30 days.
Groups Parameters Negative control 10 days 20 days 30 days
THIA
MDA (nmol/ml) 18.73±1.36 38.13±1.09 c
61.43±4.49 c 112.95±10.2 4
c
NO (µmol/ml) 26.51±2.34 66.17±3.80 c 92.50±3.53
c 163.57±7.41
c
CAT (U/L) 238.15±10.63 190.87±9.16 c
127.95±3.75 c 97.88±4.23
c
SOD (U/L) 269.65±12.22 185.12±10.09 c 100.91±4.89
c 51.90±4.35
c
AC
MDA (nmol/ml) 18.73±1.36 41.18±3.02 c
72.31±5.61 c 93.67±4.11
c
NO (µmol/ml) 26.51±2.34 52.47±2.91 c
83.32±4.90 c 122.15±8.11
c
CAT (U/L) 238.15 ± 10.63 208.55 ± 6.94c
165.51 ± 10.72 c 101.38 ±2.33
c
SOD (U/L) 269.65±12.22 191.70±9.74 c 98.73±2.26
c 78.52±4.97
c
Data are expressed as mean±SD of rats for each group. P: Significant difference when
compared to negative control group. (N.S) Non-significant: (P>0.05); (a) Significant (P <
0.05); (b) highly significant (P < 0.01); (c) very highly significant: (P < 0.001).
Heart function tests
THIA and AC significantly elevated the activities of LDH and CK-MB enzymes compared to
negative control group 251.10±11.36 (U/L) and 101.73±6.79 (U/L) after 10, 20 and 30 days;
respectively, (p<0.001). The elevations of THIA group were more than AC group, [Table 2].
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Table 2. Effects of THIA and AC on lactate dehydrogenase (LDH) and creatine kinase
(CK-MB) activities at 10, 20, 30 days.
Groups Parameters Negative control 10 days 20 days 30 days
THIA LDH (U/L) 251.10±11.36 2611.00±248.19c 3217.17±88.13
c 4570.00±305.32
c
CK-MB (U/L) 101.73±6.79 219.57±4.65c 251.33± 20.57
c 467.4±23.36
c
AC LDH (U/L) 251.10 ±11.36 1719.50 ±117.53c 1945.83±34.40
c 2 886.00±52.51
c
CK-MB (U/L) 101.73±6.79 126.27±6.52b 158.83±4.58
c 201.80±10.39
c
Data are expressed as mean±SD of rats for each group. P: Significant difference when
compared to negative control group. (N.S) Non-significant: (P>0.05); (a) Significant (P <
0.05); (b) highly significant (P < 0.01); (c) very highly significant: (P < 0.001).
TG and total cholesterol
The concentrations of TG and total cholesterol were revealed a gradually significant increase
in treated groups compared to negative control group 62.38±4.29 (mg/dl) and 83.80±4.56
(mg/dl) after 10, 20 and 30 days; respectively, (p<0.001). The changes of THIA group were
more than AC group, [Table 3].
Table: 3 Effects of THIA and AC on triglycerides (TG) and total cholesterol
concentrations at 10, 20, 30 days.
Groups Parameters Negative
control 10 days 20 days 30 days
THIA TG (mg/dl) 62.38± 4.29 74.95±1.90
c 86.01±3.72
c 112.83 ±8.03
c
Total cholesterol (mg/dl) 83.80± 4.56 115.47±4.59c
137.31±4.48c
162.21±3.89c
AC TG (mg/dl) 62.38± 4.29 71.25±0.70
c 81.48 ± 1.30
c 86.75±1.78
c
Total cholesterol (mg/dl) 83.80± 4.56 95.62± 2.85c
112.78 ± 4.68c
150.87±5.72c
Data are expressed as mean±SD of rats for each group. P: Significant difference when
compared to negative control group. (N.S) Non-significant: (P>0.05); (a) Significant (P <
0.05); (b) highly significant (P < 0.01); (c) very highly significant: (P < 0.001).
AChE activity and Testosterone hormone
AChE activity and Testosterone level were shown a gradually significant reduction in treated
groups compared to negative control group 378.77 ±43.45 (U/L) and 3.48 ±0.39 (ng/ml) after
10, 20 and 30 days; respectively, (p<0.001). The reductions of THIA group were more than
AC group, [Table 4].
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Table: 4. Effects of THIA and AC on acetylcholinesterase (AChE) activity and
testosterone level at 10, 20, 30 days.
Groups Parameters Negative control 10 days 20 days 30 days
THIA AChE (U/L) 378.77±43.45 270.71±17.26
c 227.80±5.71
c 154.28±5.02
c
Testosterone (ng/ml) 3.48±0.39 1.48±0.30 c 0.44±0.09
c 0.14 ±0.80
c
AC AChE (U/L) 378.77±43.45 246.10±7.62
c 221.12±6.85
c 199.03±6.66
c
Testosterone (ng/ml) 3.48±0.39 2.48±0.23 c 1.55±0.24
c 0.85±0.11
c
Data are expressed as mean±SD of rats for each group. P: Significant difference when
compared to negative control group. (N.S) Non-significant: (P>0.05); (a) Significant (P <
0.05); (b) highly significant (P < 0.01); (c) very highly significant: (P < 0.001).
Histopathological examinations
The histopathological studies in different organs (heart, brain and testis) were illustrated at
figures [1 (A to G), 2 (A to G) and 3(A to G)] respectively at 10, 20 and 30 days.
The histopathological studies in different organs were approved by the biochemical analyses
at 10, 20 and 30 days in both treatments. There was a relation between the increase in extent
of the damages in different organs and the increase in periods of treatments of these
insecticides. The changes occurred in THIA group may be more than the changes occurred in
AC group in different tissues.
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Fig.1: Photomicrograph of histopathological examination in heart tissues in studied
groups. 1A): Negative control group showing normal structure: bundles of cardiac
muscles (B), stroma (S) and red blood cells (R) (H&E., X100). In THIA group, 1B):
after10 days showing small sized atrophic muscles (A). 1C): after 20 days showing
atrophic muscles (A) and area of hemorrhage (H). 1D): after 30 days showing large
areas of hemorrhage (H) and necrosis (N). In AC group, 1E): after 10 days showing
normal cardiac muscles (CM). 1F): after 20 days showing area of hemorrhage (H) and
atrophic muscles (A). 1G): after 30 days showing area of hemorrhage (H), atrophic
muscles (A) and small area of necrosis (N) (H&E., X200).
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Fig 2: Photomicrograph of histopathological examination in brain tissues (cerebrum
part) in studied groups. 2A): Negative control group showing neuronal cells (NC) and
neurofibrillary eosinophilic material (NE). In THIA group, 2B): after 10 days showing
separations of the brain tissue by areas of edema (E). 2C): after 20 days showing areas
of edema (E) and atrophic neurons (A). 2D): after 30 days showing large areas of edema
(E) and necrosis (N). In AC group, 2E): after 10 days showing mild areas of edema (E).
2F): after 20 days showing areas of atrophic neurons (A) and gliosis (G). 2G): after 30
days showing atrophic neurons (A) and large areas of edema (E). (H&E., X200).
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Fig.3: Photomicrograph of histopathological examination in testis tissues in studied
groups. 3A): negative control group showing seminiferous tubules lined by
spermatogenic layers: primary spermatocytes (P), secondary spermatocytes (SE),
sperms (S) and basement membrane (B) (H&E.,X 400). In THIA group, 3B): after 10
days showing mild normal seminiferous tubules. 3C): after 20 days showing sloughing
of spermatogenic cells (S) and reduced number of sperms (R). 3D): after 30 days
showing reduced number of spermatogenic layers (R), edema (E), disappear sperms in
some regions (D) and congestion (C). In AC group, 3E): after 10 days showing mild
normal seminiferous tubules. 3F): after 20 days showing areas of edema (E) and
reduced number of sperms (R). 3G): after 30 days showing sloughing of spermatogenic
cells (S), areas of edema (E), reduced number of sperms (R) and congestion (C) (H&E.,
X 200).
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DISCUSSION
Neonicotinoids undergo trans-epithelial absorption across intestinal cells resulting in their
toxicity when they accumulate within the body organs. They can be induced oxidative stress
by producing reactive oxygen species (ROS). The measurement of oxidative stress
biomarkers may be very important to study oxidative damage caused destruction of various
tissues.[24]
THIA, AC and their metabolites may be regarded as an agonist of nicotine (main
constituent of neonicotinoid) and iNOS. THIA and AC metabolized to 6-chloramphenicol
acid forming carbamidine inhibited iNOS.[25]
This study reported that THIA and AC caused a
significant increase in the levels of MDA, NO and a significant decrease in the activities of
CAT, SOD in plasma after 10, 20 and 30 days respectively (p<0.001) compared to negative
control group (Table1). Elevated nitric oxide (NO) and MDA levels might be caused tissue
damage by lipid peroxidation (LP) induction leading to disorganization of the membrane.
MDA is an important indicator of oxidative stress in cells.[26]
THIA and AC metabolites
produce superoxide anion and hydrogen peroxide induced depletion the antioxidants.
Moreover, nicotine may stimulate LP and NO production and drop in CAT and SOD
activities. SOD is responsible for catalyzing the conversion of the superoxide ion into water
and molecular oxygen. Also, CAT is an essential defense enzyme against oxygen species.[27]
Our results were agreement with many authors, Kapoor et al.[28]
who explained that
imidacloprid (IMI) reduced in SOD and CAT activities, but it increased MDA level in ovary
due to oxidative stress and caused the imbalance of hormones. Duzguner and Erdogan[29]
who
reported that IMI elevated NO production due to iNOS induction in liver and plasma. Also,
IMI raised MDA and LP levels because IMI acted on unsaturated fatty acids of phospholipid
components of membranes and produced tissue damage. EL-Gendy et al. [30]
who disagreed
with our results as IMI caused the elevations in CAT and SOD activities in liver attributed to
defense mechanisms against oxidative damage.
Heart could be pumped blood that provided the body with oxygen and removed metabolic
wastes. CK-MB and LDH are indicators to loss enzymes from the injured heart tissue to
blood when its membrane becomes rupture and they are the useful markers of myocardial
infarction.[31]
Both insecticides significantly elevated in the activities of LDH and CK-MB. Also, it caused
a significant increase in the concentrations of TG and total cholesterol after different periods
respectively (p<0.001) compared to negative control group (Table2, 3). The biochemical
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changes in secreted heart enzymes and synthetic capacity of cardiac cells can be confirmed
by histopathological analysis. THIA and AC induced atrophic cardiac muscles, hemorrhage
and necrosis in cardiac muscles (Fig.1 [A to G]). The elevations of total cholesterol and TG
are due to the accumulation of lipids in heart causing hyperlipidemia and irreversible damage
in it. Also, the rises of LDH and CK-MB enzymes reflect on the alterations permeability
fluids in cardiac muscle and cause edema. LDH, cholesterol and triglycerides may be linked
to cardiovascular risk factors. However, THIA and AC metabolites could generate ROS and
damage the myocardium tissues. Nicotine could release catecholamines and stimulate
lipolysis. It may induce cardiac edema and necrosis due to oxidative stress.[32]
Our results were in harmony, Park et al.[33]
who discussed that IMI increased LDH activity
and caused cardiac necrosis. Gokulakrisnan et al.[34]
who demonstrated that cigarette smoking
(contain nicotine) induced cardiac damage by the elevation in CK-MB activity due to LP and
protein oxidation. Goyal et al.[35]
who showed thiacloprid produced mild myocardial
hemorrhages and congestion due to metabolite toxicities, oxidative stress and endocrine
disorders. Shalaby et al.[36]
who described that THIA caused a rise in TG concentration after
5 and 10 days due to a shift in lipid metabolism.
Brain plays a critical role in the body’s sensitivity and response to stress. It is susceptible to
oxidative damage due to LP that damaged neural cells. Acetylcholinesterase (AChE) is a key
enzyme in detecting the neurotoxicity.[37]
The current results observed a significant reduction in AChE activity after different studied
periods respectively (p<0.001) compared to negative control group (Table 4). The
biochemical alteration in secreted brain enzyme and synthetic capacity of brain cells can be
confirmed by histopathological study. THIA and AC groups produced areas of edema,
atrophic neurons, area of necrosis in neural cells and gliosis after 10, 20 and 30 days (Fig.2
[A to G]). Neonicotinoids act on the central nAChRs and cause changes of the
phosphorylation state of AChE, nAChRs and choline action producing an imbalance in the
cholinergic neurotransmission. Also, the decline in AChE activity could be caused gliosis.
Nicotine could induce brain edema and brain inflammation.[38]
On a hand, our records were in
the same line with Rodrigues et al.[39]
who suggested that THIA dropped AChE activity after
1 week due to affecting on AChE or nAChRs.
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Testosterone hormone plays a key role in the growth of male reproductive tissues and
stimulates spermatogenesis in testis.[40]
THIA and AC caused a significant decrease in the
testosterone level compared to negative control group (p<0.001) respectively at tested periods
(Table4). This result approved by histological examination in testicular tissue and impaired of
its function of spermatogenesis. They induced sloughing of spermatogenic cells, reduced
number of sperms and spermatogenic layers in seminiferous tubules and loss sperms in some
regions (Fig.3 [A to G]). THIA, AC and their metabolites induced oxidative stress leading to
loss testicular and spermatogonia tissues.[41]
Nicotine may cause a decreasing in sperm
function. Also, nAchRs could be acted on these insecticides and suppressed gonadotropins
releasing that caused the hormonal imbalance of luteinizing hormone (LH) and follicle-
stimulating hormone (FSH) due to the fall in sperm production.[42]
Our study agreed with
Soujanya et al.[43]
who found that IMI prompted degeneration seminiferous tubules due to
oxidative stress and triggered a reduction in the testosterone level.
Nitro group is higher reactivity and stronger in electrophilicity than cyano group because it
reduced the stability of the benzene ring as result of its resonance structure: O=N+-O
-- and O
--
- N+=O. It may be resistant to oxidative degradation prompted mutagenicity. The lower
toxicity of AC can be attributed to its rapid metabolism and less bioaccumulative, while the
higher toxicity of THIA can be known as more bioaccumulative.[44]
According to these
results, the biochemical alterations were confirmed by histopathological alterations in
different organs at 10, 20 and 30 days.
CONCLUSION
According to our data, we found that THIA and AC may induce antioxidant alterations in
plasma. They could be neurotoxic, cardiotoxic and testicular toxic. The adverse effects of
THIA may be more than AC on plasma, heart, brain and testis. Use of these insecticides
should be under control to damage the pests with avoiding possible bad effects on the
environment.
ACKNOWLEDGEMENT
Authors are very much thankful to Chemistry department, Science Faculty, Zagazig
University, Egypt for providing the place of study.
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