Animal Experimentation
Neuroprotective effect of wormwood against lead
exposure
O Kharoubi, M Slimani, A Aoues
Department of Biology, Faculty of Science, Laboratory of Biochemistry, University of Es-Senia, Oran, Algeria
ABSTRACT
Background: Lead poisoning is a potential factor in brain damage, neurochemical dysfunction and severe behavioral
problems. Considering this effect, our study was carried out to investigate the effects of wormwood to restore enzymes
activities, lipid peroxidation and behavioral changes induced by lead. Methods: Thirty Wistar rats were divided into five
groups (n = 6 in each group): three groups exposed to 750 ppm of lead acetate in the drinking water for 11 weeks and
two groups as control. Aqueous wormwood extract (200 mg/kg body weight) was administrated to intoxicated (Pb(-)+A.AB)
and control groups (A.AB) for four supplemental weeks. Activities of acetylcholinesterase (AchE), monoamine oxidase (MAO)
and thiobarbituric acid-reactive substances (TBARS) level were determined in the hypothalamus, hippocampus, cortex and
striatum of male rats and the grooming and locomotors activity were defined in all groups. Results: The intoxicated group
(Pb) has a significantly increased TBARS value compared with the control in all brain regions (P < 0.05) and, after treatment
with the wormwood extract, a significant reduction was noted. The enzyme activity decreased significantly (P < 0.05) in the
Pb group compared with the control, essentially for the hippocampus (AchE: -57%, MAO: -41%) and the striatum (AchE:
-43%, MAO: -51%). After wormwood extract administration, the AchE and MAO activity were significantly increased in
all brain regions compared with the Pb group (P < 0.05). The behavioral test (locomotors and grooming test) indicates a
significant hyperactivity in the Pb group compared with the control group. After treatment with wormwood extract, the Pb()+A.Ab indicates a lower activity compared with Pb. Conclusion: These data suggest that wormwood extract may play a
very useful role in reduction of the neurotoxicological damage induced by lead.
Key Words: Acetylcholinesterase, behavioral test, brain region, lead acetate, lipid peroxidation, monoamine oxidase
INTRODUCTION
Lead (Pb) is a highly neurotoxic agent that particularly affects
the developing central nervous system. Lead poisoning is a
potential factor in brain damage, mental impairment and severe
behavioral abnormalities, neuromuscular weakness, decreased
hearing, impaired cognitive functions in experimental animals
and coma.[1,2,3] Oxidative stress, oxidative damage to cellular
components and activation of the oxidant-sensitive transcription
Address for correspondence:
Dr. O Kharoubi, E-mail: omarkharoubi@yahoo.fr
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DOI:
10.4103/0974-2700.76834
82
factor could, in part, underlie some of the toxic effects of Pb.
The deleterious effects of Pb can involve both reactive oxygen
species (ROS) and reactive nitrogen species.
Experimental evidence suggests that cellular damage mediated
by free radicals can be involved in the pathology associated
with Pb intoxication.[3] In fact, the cerebral damage induced by
lead occurs preferentially in the cerebral cortex, cerebellum and
hippocampus.[4,5] The cognitive functions are localized in the
cerebral cortex while the cerebellum regulates the execution of
driving movements, whereas the hippocampus area is the site of
memory storage and was implicated in behavioral comportment.
Consequently, these anatomical sites are crucial by modulating
the emotive answer, memory and behavior, and exposure of the
young brain under development to lead can compromise a variety
of neurotransmitter systems.[2,4,5]
Recently, the clinical importance of herbal drugs has received
considerable attention. As many synthetic antioxidants have been
shown to have one or the other side-effects,[6] there has been
Journal of Emergencies, Trauma, and Shock I 4:1 I Jan - Mar 2011
Kharoubi, et al.: Protective effect of wormwood on neurotoxicity of lead
an upsurge of interest in the therapeutic potential of medicinal
plants as antioxidants in reducing free radical-induced tissue
injury.[7,8] Numerous plant products have been shown to have an
antioxidant activity and the antioxidant vitamins, flavonoids and
polyphenolic compounds of plant origin have been extensively
investigated as scavengers of free radicals and inhibitors of lipid
peroxidation.[9]
Excessive production of radical species plays an important
role in neuronal pathology resulting from excitotoxic insults
and therefore one plausible neuroprotective mechanism of
bioflavonoid is partly relevant to their metal chelating and
antioxidant properties. Bioflavonoids are claimed to exert
antimutagenic, neurotrophic and xenobiotic ameliorating and
membrane molecular stabilizing effects.[10]
Wormwood (Artemisia absinthium L.) has a high content of
nutrients and phytochemicals such as total phenolic compounds
and total flavonoids, suggesting that these compounds contribute
to the antioxidative activity.[11] Phenolic substances such as
flavonols, cinnamic acids, coumarins and caffeic acids or
chlorogenic acids are believed to have antioxidant properties that
may play an important role in protecting cells and any organ from
oxidative degeneration.[12,13] However, no study has reported the
effects of Artemisia absinthium L. on lead-induced neurotoxicity.
The deficits in learning and memory in Pb-exposed rodents
are accompanied by damage to neurons and changes in some
neurotransmitters, such as the cholinergic and catecholamine
neurotransmitter system are involved.[14,15] In this study, we
used behavioral and neurochemical experiments to determine
the protective effects of wormwood against the neurotoxicity
induced by lead.
METHODS
Preparation of wormwood plant extracts (A.Ab)
Whole plants of Artemisia absinthium L. were collected from
Mecheria, Algeria, in the month of May. The plant was
identified and authenticated at the Herbarium of Botany
Directorate in Es-Senia (Oran) University. Five hundred
grams of whole wormwood plants were extracted with 1.5 L
of distilled water by the method of continuous hot extraction
at 60°C twice for 30 min and the filtrate was lyophilized.
The residue collected (yield 75 g) was stored at -20°C. When
needed, the extract was dissolved in distilled water and used
in the investigation.
Animals and tissue preparation
In the experiment, a total of 30 male Wistar rats (18 intoxicated
rats, 12 normal rats) were used. The rats were housed five per
cage and had free access to food and water, except during
testing. They were exposed to a 14–10-h light–dark cycle and
the room temperature was controlled at 23 ± 2ºC. Animals
were first exposed to Pb at the age of 2 weeks, when they
weighed 40 ± 6 g.
Journal of Emergencies, Trauma, and Shock I 4:1 I Jan - Mar 2011
Experiments were performed during 15 weeks. The 30 Wistar
rats were divided into five groups according to:
In the first period:
a) Control: Rats received water during 11 weeks.
b) Pb group: Rats exposed to Pb (750 ppm, in the form of Pb
acetate in their drinking water ad libitum) for 11 weeks.
In the second period:
a) A.Ab group: After stopped intoxication, the control group
received A.Ab extracts at the dose of 200 mg/kg in drinking
water ad libitum for 4 weeks.
b) Pb(-) group: After 11 weeks, intoxication by lead was stopped
and the rats received water for four additional weeks.
c) Pb(-)+A.Ab groups: After intoxication, rats received A.Ab
extract at the dose of 200 mg/kg in their drinking water ad
libitum for 4 weeks.
Animals were sacrificed by cervical decapitation under
pentobarbital sodium anesthesia (60 mg/kg). The brain was
removed, washed with normal saline and all the extraneous
materials were removed before weighing. The brain was kept
at ice-cooled conditions all the time. The brain was dissected
using the method of Glowinski and Iversen[16] into four regions
of interest: hypothalamus, hippocampus, cerebral cortex and
striatum. Due to the small amount of tissue, tissue of three
littermates was pooled.
Brain cytosolic and mitochondrial fractions
The rat brain tissue was minced and homogenized in 500 μl of
buffer A (20 mM HEPES, pH 7.5, 50 mM KCl, 1 mM EDTA, 2
mM MgCl2, 220 mM mannitol, 68 mM sucrose, 1 mM leupeptin,
5 μg/ml pepstatin A, 5 μg/ml aprotonin, 0.5 mM PMSF). The
homogenate was subjected to differential centrifugation to collect
the supernatant (cytosolic fractions) and the pellets (enriched
mitochondria fractions). The cytosolic fractions were frozen at
-70°C until further analysis. Pellets containing mitochondria were
treated with the lysis buffer (1X PBS, 1% NP-40, 0.5% sodium
deoxycholate, 0.1% SDS, 250 mM sucrose, 20 mM Tris HCl, pH 7.4,
1 mM DTT and protease inhibitor) and were incubated on ice for
20 min. The lysate was centrifuged at 10,000 g at 30 min at 4°C and
the resulting supernatant was kept as the solubilized mitochondrialenriched fractions and stored at –70°C until further use.
Estimation of lipid peroxidation
Lipid peroxidation in the brain was estimated colorimetrically
by thiobarbituric acid reactive substances (TBARS) by the
method of Niehius and Samuelsson.[17] In brief, 0.1 ml of tissue
homogenate (Tris-HCl buffer, pH 7.5) was treated with 2 ml of
(1:1:1 ratio) TBA-TCA-HCl reagent (thiobarbituric acid 0.37%,
0.25 N HCl and 15% TCA) and placed in a water bath for 15
min and cooled. The absorbance of the clear supernatant was
measured against the reference blank at 535 nm.
Estimation of monoamine oxidase and
acetylcholinesterase activity in the brain
The activity of estimation of monoamine oxidase (MAO) was
83
Kharoubi, et al.: Protective effect of wormwood on neurotoxicity of lead
estimated by the method of Green and Haughton.[18] The assay
mixture containing 1.0 ml of semicarbazide hydrochloride (0.05
M, pH 7.4), 1.6 ml of phosphate buffer (0.2 M, pH 7.4) and 0.4
ml of mitochondrial fraction was incubated for 20 min at 37°C
in a water bath with a shaking device. The reaction was started
by adding 0.5 ml of tyramine hydrochloride (0.1 M, pH 7.4) and,
after 30 min of incubation, the reaction was stopped by adding
1.0 ml of 0.5 N acetic acid and kept in a boiling water bath for 30
min. The contents were centrifuged for 10 min at 1000× g and,
to 2.0 ml of the supernatant, 2.0 ml of 2,4-dinitriphenylhydrazine
(0.5 mg/ml in 2N HCl) was added. After keeping at room
temperature for 15 min, 5 ml of benzene was added. The tubes
were vortexed and the aqueous layer was discarded. The benzene
layer was washed with 4 ml of distilled water followed by the
addition of 4 ml of 0.1N NaOH solution and the contents of the
tubes were mixed thoroughly. The benzene layer was discarded
and the NaOH layer was allowed to stand at room temperature
for 1 h. The absorbance of the samples was measured at 425
nm. The activity of MAO was calculated using a molar extinction
coefficient of 9,500 and expressed as micromoles of p-hydroxy
phenyl acetaldehyde formed per milligram of protein.
The activity of acetylcholinesterase (AchE) was estimated
by the Ellman et al.[19] method. This method is based on the
measurement of the rate of thiocholine production in the
hydrolysis of the substrate acetylcholine. Thiocholine, when
reacting with dithiobisnitrobenzoic acid (DTNB), produces a
yellow color, which can be measured photometrically. In the
reaction mixture, 0.4 ml of synaptosome fractions (average
protein content, 0.2–0.4 mg/ml) and 2.6 ml of 0.1 M phosphate
buffer, pH 8.0 (containing 0.749 g KH2PO4, 16.820 g Na2HPO4
2H2O and 1,000 ml water) were incubated for 30 min at 37ºC
under continuous stirring. The samples were moved into
photometer cells and 100 μl 5.5-dithiobis-2-nitrobenzoic acid
(DTNB) was added. Twenty microliters of the substrate and
0.075 M acetylcholine iodide were added into the photometer
cells. The absorbance was measured at 412 nm after 1 min and
5 min. The enzyme activity is expressed as µmol of substrate
hydrolyzed/min/mg of protein.
Neurobehavioral studies
Locomotors activity was evaluated in the open-field test. The
open-field behavior of rats was assessed in a box measuring 90
cm x 90 cm x 30 cm, subdivided into 19 equal squares by black
lines. Immediately after this, the rat was placed in the center of
the open-field, the movements of the rat were scored and the
grooming activity (scratching, fur licking, nose washing) was
recorded during the 5-min session for 30 min.
Statistics
The mean ± SEM values were calculated for each group to
determine the significance of the intergroup difference. Each
parameter was analyzed separately using the one-way analysis of
variance (ANOVA) test. To determine the difference between
the groups, Student’s “t”-test was used. P-values <0.05 were
considered to be significant.
84
RESULTS
A significant increased in blood and urinary lead concentration
(respectively, PbB and PbU) was noted between the Pb group
(PbU = 6.94 ± 1.7 µg/day, PbB = 55.62 ± 6.30 µg/dl) compared
with the control (P < 0.05). After stopped intoxication and
treatment by wormwood, the level of lead in the Pb(-)+A.
Ab group was significantly decreased compared with the Pb(-)
group by -46.2% in PbB. The TBARS levels are significantly
increased in the Pb group compared with the control group by
+182%, +50%, 142% and 114% in the hippocampus, striatum,
cortex and hypothalamus, respectively. After wormwood extract
administration, a significant reduction (P < 0.05) was noted
in Pb(-)+A.Ab compared with Pb(-); however, this remains
increased compared with the control by +25%, +19%, +28%,
+49% and +40% in all regions previously cited [Figure 1].
The activity of AchE was significantly reduced in all brain regions
in the intoxicated group vs. the control group after 11 weeks of
intoxication (P < 0.05), and by -57% in the hippocampus, -43%
in the striatum, -18% in the cortex and -11% in the hypothalamus,
respectively. After 4 weeks of stopped intoxication, a maximum
reduced activity was noted in the hippocampus of the Pb(-)
group (-77%) (P < 0.05). Administration of wormwood extract
indicates a clear significant improvement in the Pb(-)+A.Ab
group compared with the Pb group (hippocampus +41%;
striatum +37%; cortex +10% and no difference in hypothalamus,
respectively) [Figure 2].
We observed a significant decrease (P < 0.05) in the MAO
activity in different cerebral areas in the Pb group compared with
the control group in the hippocampus: -41%; in the striatum:
-51%; in the cortex: -28%; and in the hypothalamus: -29%.
After treatment with wormwood extract, the Pb(-)+A.Ab group
indicated a significant increase (P < 0.05) in MAO activity in all
brain regions compared with the Pb group, by +10%, +47%,
+18% and +24% in the hippocampus, striatum, cortex and
hypothalamus, respectively [Figure 3].
Chronic exposures to lead significantly increase the total general
behavior, which included locomotor activity (control 15 ± 2.1 vs.
Pb group 21 ± 2.8) and grooming (control 0.9 ± 0.4 vs. Pb group
1.8 ± 0.5). After aqueous wormwood extract administration for
4 weeks, a significant difference score was observed (P < 0.05)
between the Pb(-)+A.Ab and the Pb group in all tests, by -24.7% in
the locomotor activity and -51.3% in the grooming test [Figure 4].
DISCUSSION
In this study, the effects of aqueous wormwood extract on leadinduced locomotors and grooming impairment and changes in
some enzyme activities in different regions of the brain and lipid
peroxidation were investigated. The prevention of lead-induced
neurotoxic injury by wormwood extract is reported here for the
first time. Exposure to lead during early development has been
implicated in lasting behavioral abnormalities and cognitive
Journal of Emergencies, Trauma, and Shock I 4:1 I Jan - Mar 2011
Kharoubi, et al.: Protective effect of wormwood on neurotoxicity of lead
a
b
6
nmol/mg protein
*
*#
3
#
#
nmol/mg protein
4
*
*
#
#
2
0
Control
Pb
A.Ab
at 11-we e ks
Pb(-)
Pb(-) + A.Ab
0
Control
at 4-we e ks
Pb
A.Ab
Pb(-)
at 11-we e ks
d
c
4
6
*
*
3
*#
#
nmol/mg protein
*
nmol/mg protein
Pb(-) + A.Ab
at 4-we e ks
*
*#
2
#
0
0
Control
Pb
A.Ab
at 11-we e ks
Pb(-)
Control
Pb(-) + A.Ab
Pb
A.Ab
Pb(-)
at 11-we e ks
at 4-we e ks
Pb(-) + A.Ab
at 4-we e ks
Figure 1: Brain thiobarbituric acid-reactive substances levels in all groups treated and untreated groups with wormwood extract. (a)
Hippocampus, (b) striatum, (c) cortex and (d) hypothalamus. Values are mean ± SE (n = 6). *P <0.05, Pb group, A.Ab group, Pb(-) group and Pb(-)
+A.Ab group were compared vs. control. #P <0.05, A.Ab group, Pb(-) group and Pb(-)+A.Ab group are compared vs. Pb group (Student’s “t”-test)
a
b
1,6
#
*#
0,3
*
*
mmol/min/mg protein
nmol/min/mg protein
0,6
#
*#
0,8
0
0
Control
Pb
A.Ab
at 11-we e ks
Pb(-)
Pb(-) + A.Ab
Control
at 4-we e ks
Pb
#
#
*
0,2
0
Control
at 11-we e ks
Pb
A.Ab
Pb(-)
Pb(-) + A.Ab
at 4-we e ks
d
Pb(-)
at 4-we e ks
Pb(-) + A.Ab
#
0,4
mmol/min/mg protein
0,4
A.Ab
at 11-we e ks
c
mmol/min/mg protein
*#
*
*
0,2
0
Control
at 11-we e ks
Pb
A.Ab
Pb(-)
Pb(-) + A.Ab
at 4-we e ks
Figure 2: Brain acetylcholinesterase activity in all treated and untreated groups by wormwood extract. (a) Hippocampus, (b) striatum,
(c) cortex and (d) hypothalamus. Values are mean ± SE (n = 6). *P <0.05, Pb group, A.Ab group, Pb(-) group and Pb(-) +A.Ab group
were compared vs. control. #P <0.05, A.Ab group, Pb(-) group and Pb(-)+A.Ab group are compared vs. Pb group (Student’s “t”-test)
Journal of Emergencies, Trauma, and Shock I 4:1 I Jan - Mar 2011
85
Kharoubi, et al.: Protective effect of wormwood on neurotoxicity of lead
b
a
4
*#
*#
*
*
4
#
nmol /min/mg protein
nmol /min/mg protein
8
*#
*
0
0
Control
Pb
A.Ab
at 11-we e ks
Pb(-)
Control
Pb(-) + A.Ab
Pb(-) + A.Ab
#
nmol/min/mg protein
*#
*
*
*#
A.Ab
at 11-we e ks
Pb(-)
*#
*
2
0
Pb
Pb(-)
at 4-we e ks
4
#
Control
A.Ab
d
c
6
Pb
at 11-we e ks
at 4-we e ks
12
nmol/min/mg protein
*
2
0
Pb(-) + A.Ab
Control
at 4-we e ks
Pb
A.Ab
Pb(-)
at 11-we e ks
Pb(-) + A.Ab
at 4-we e ks
Figure 3: Brain monoamine oxidase activity in all treated and untreated groups by wormwood extract. (a) Hippocampus, (b) striatum,
(c) cortex and (d) hypothalamus. Values are mean ± SE (n = 6). *P <0.05, Pb group, A.Ab group, Pb(-) group and Pb(-) +A.Ab group
were compared vs. control. #P <0.05, A.Ab group, Pb(-) group and Pb(-)+A.Ab group are compared vs. Pb group (Student’s “t”-test)
Grooming
Grooming
4
Score
Score
4
2
0
5
10
15
20
25
30
2
0
Time
5
Locomotors activity
15
20
25
30
Tim e
Locomotors activity
30
40
Score
Score
10
15
0
5
10
15
20
25
30
Tim e
20
0
5
10
15
20
25
30
Tim e
Figure 4: Locomotors and grooming test in all treated and untreated groups
86
Journal of Emergencies, Trauma, and Shock I 4:1 I Jan - Mar 2011
Kharoubi, et al.: Protective effect of wormwood on neurotoxicity of lead
deficits in experimental animals.[3,20] Besides, the present work
showed that administration of lead to rats for 11 weeks induced
locomotor hyperactivity. Other studies demonstrated the same
results in rats treated with lead during the post-natal period.[21]
The hyperactivity found in the present study could be explained
by the lead effect on the dopaminergic system and glutamatergic
transmission on the level of NMDA receptor (N-métyl-Daspartate).[14]
It is demonstrated that metal accumulation is associated with high
levels of lipid peroxidation in different regions of the brain, such
as hippocampus and cerebellum.[22] The vulnerability of neuronal
membrane oxidative stress and cellular peroxidation induced by
lead is due to the presence of a relatively high concentration of
fatty acids that are readily oxidizable. In addition, production of
ROS and alteration of homeostasis in vivo may be major factors
in the severity of lead poisoning.
Pb-exposed rats are consistent with dysfunction of cholinergic
innervations.[23] The involvement of the cholinergic system has
been implicated by the observations that early lead exposure
results in a significant reduction in high-affinity choline uptake in
mouse forebrain synaptosomes[24] and a depressed acetylcholine
turnover in rat brain.[25] However, these changes in the cholinergic
ways could be associated with the peroxydative damage caused
on the neuronal membrane.[26]
We observed that administration of lead acetate significantly
decreased the MAO activity in various cerebral areas. The work
undertaken by Devi et al.[5] showed that lead administration
modifies the aminergic system by reducting the activity of
mitochondrial MAO and tyrosin hydroxylase. The effects
observed during exposure to the high Pb levels on MAO and
catecholamines at the cerebral level are not a direct consequence
of the intoxication by lead but a resultant of the inhibiting effect
of the cholinergic system.[27] The reduction in the activity of
MAOs in the various cerebral areas, during the exposure to lead,
can be due to the cellular damage[28] and with the high affinity of
Pb to sulfhydryl group of these enzymes.[29]
In addition, we observed that administration of the aqueous
extract of wormwood has a clear improvement in the various
behavioral tests compared with rats exposed to lead. In the
same way, we recorded that administration of plant extract after
stopped poison induced a re-establishment of the enzymatic
activities (AchE and MAO) and significantly reduced the TBARS
values in the various cerebral structures compared with the Pb
groups. The prophylactic effectiveness of this extract can be
allotted to its antioxidant action and/or its chelating capacity due
primarily to the action of sulfhydryl groups. These results agree
with the fact that the natural compounds rich in antioxidants
involve a considerable improvement in the enzyme activity
and reduce oxidative stress,[30] which plays a significant role in
the toxicity inversion of lead by forming inert complexes and
inhibiting its toxicity on the dopaminergique neurons.[31]
Journal of Emergencies, Trauma, and Shock I 4:1 I Jan - Mar 2011
CONCLUSION
In conclusion, lead exposure induced a significant behavioral
alteration as well as neurochemical alteration in different brain
regions in rats exposed to Pb. Moreover, Artemisia absinthium L.
prevents neurotoxicity induced by lead by decreasing the lipid
peroxidation, modifying locomotor behaviors and grooming and
restoring enzyme activities involved in the regulation of some
neurotransmitters.
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How to cite this article: Kharoubi O, Slimani M, Aoues A.
Neuroprotective effect of wormwood against lead exposure. J Emerg
Trauma Shock 2011;4:82-8.
Received: 02.12.09. Accepted: 06.09.10.
Source of Support: Nil. Conflict of Interest: None declared.
Journal of Emergencies, Trauma, and Shock I 4:1 I Jan - Mar 2011
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