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Current Research Journal of Biological Sciences 4(2): 123-129, 2012
ISSN: 2041-0778
© Maxwell Scientific Organization, 2012
Submitted: September 29, 2011 Accepted: November 04, 2011 Published: March 10, 2012
Corresponding Author: F.A. Dawud, Department of Human physiology Ahmadu Bello University, Zaria Nigeria, Tel.:
+2347037701824. 123
Ameliorative Effects of Vitamin C and Zinc in Alloxan-induced Diabetes and
Oxidative Stress in Wistar Rats
1F.A. Dawud, 1E.D. Eze, 1A.A. Ardja, 1A. S. Isa, 1A. Jimoh, 2M. Bashiru and 1I.S. Malgwi
1Department of Human Physiology, Ahmadu Bello University, Zaria, Nigeria
2Department of Biochemistry, Ahmadu Bello University, Zaria, Nigeria
Abstract: This study was undertaken to evaluate the ameliorative effects of vitamin C and zinc on blood
glucose levels and lipid peroxidation in Alloxan-induced diabetic Wistar rats. Diabetes was induced in animals
by intraperitoneal injection of Alloxan monohydrate (150 mg/kg b w). Diabetic rats were randomly divided into
three groups (n = 5): Rats in group I were given 1ml of distilled water and served as the control. Rats in group
II and group III were administered 100 50 mg/kg b w of vitamin C and zinc respectively. The regimens were
given once daily for seven days. Blood samples collected from the animals at the end of the treatment period
and assayed for malonaldehyde (MDA) as index of lipid peroxidation. The study showed that there was a
significant (p<0.05) decrease in the blood glucose levels of 206.40±33.71, 115.80±14.75, 204.20±55.93 and
125.80±25.44, 118.0±9.55, 123.60±31.71, with Vitamin C 100 mg/kg and zinc 50 mg/kg respectively when
compared to control group. Alloxan induced group showed an increased concentration of Malondialdehyde
(MDA) of 3.16±0.98. However, there was a significant reduction (p<0.05) in Malondialdehyde concentration
in the group that received 50 mg/kg b w of zinc, while no significant change (p>0.05) was observed in the
group that were administered 100 mg/kg b w of vitamin C when compared to the diabetic control group. The
present study has shown that vitamin C and zinc had a beneficial effect on Alloxan induced hyperglycemia and
oxidative stress as evidenced by decreased malondialdehyde (MDA) concentration.
Key words: Alloxan, diabetes mellitus, malondialdehyde, oxidative stress, vitamin C, zinc
INTRODUCTION
Diabetes Mellitus (DM) is a major health problem
worldwide in recent time, and Asia and Africa are the
most viable area where the disease is feared to rise 2-3
folds (Jamkhande et al., 2010) it is a metabolic disorder
characterized by hyperglycemia and insufficiency of
secretion or action of endogenous insulin (Maritim et al.,
2002) the sustained hyperglycemia attacks both
microvessels throughout the body and leads to various
complications like blindness, neuropathy, end stage
kidney disease, liver damage and cardiovascular events
(Tea and Henrik, 2009). Increased oxidative stress is a
widely accepted participant in the development and
progression of diabetic tissue damage and induced
changes in the activities of antioxidant enzymes in various
tissues (Ceriello, 2000; Ahmed, 2005a, b). In diabetes
mellitus, oxidative stress seems mainly to be due to an
increased production of free radicals and/or a sharp
reduction of antioxidant defenses (Low et al., 1997;
Giugliano et al., 1996). Free radical production caused by
hyperglycemia may occur via at least four different
routes:
CIncreased glycolysis
CIntercellular activation of sorbitol pathway
CAuto-oxidation of glucose nonenzymatic protein
glycation (Vaag et al., 1992; Williamson et al., 1993;
Wolff et al., 1991; Ceriello et al., 1992).
Vitamin C (ascorbic acid) is a water-soluble
micronutrient required for multiple biological functions
(Halliwell, 2001). It is found intra- and extracellularly as
ascorbate, and is well absorbed from the gastrointestinal
tract (Chihuailaf et al., 2002; Woollard et al., 2002;
Asiley et al., 2004). Vitamin C is a natural antioxidant
that prevents the increase production of free radicals
induced by oxidative damage to lipids and lipoproteins in
various cellular compartments and tissues (Sies et al.,
1992). It has been shown to react directly with superoxide
hydroxyl radicals, and singlet oxygen (Hemila et al.,
1985; Bielski, 1982; Bodannes and Chan, 1999). The
antioxidant function of vitamin C is related to its
reversible oxidation and reduction characteristics. Thus,
vitamin C may particularly prevent certain types of
hepatic cellular damage (McDowell, 1989; Parola et al.,
1992; Sies et al., 1992; Burtis and Ashwood, 1994)
Zinc is the second most abundant trace element in the
body (Zhou et al., 2007). It is contained in hundreds of
enzymes and is involved in numerous aspect of cellular
metabolism. It is required for the catalytic activity of
Curr. Res. J. Bio. Sci., 4(2): 123-129, 2012
124
approximately hundred enzymes (Sandstead, 1994).
Numerous aspect of cellular metabolism are zinc
dependent (Institute of Medicine, Food and Nutrition
Board, 2001), and in even more protein domains,
particularly in a number of cellular processes, including
cellular proliferation and differentiation (Franco et al.,
2009). Zinc plays an important role in the structure and
function of biological membranes (Bettger and O’Dell,
1993). Zinc has been shown to have an antioxidant
potential through the non-enzymatic stabilization of
biomembrane and biostructures. The protective effects of
zinc could be attributed to its ability to reduce collagen
accumulation in liver and also it exert critical
physiological role in regulating the structure and function
of cells (Sidhu et al., 2004). Apart from being an essential
component of the antioxidant enzyme, superoxide
dismutase, zinc also antagonizes the catalytic properties
of the redox activity transition metals iron and copper in
promoting the formation of hydroxyl from hydrogen
peroxide and superoxide in Fenton reactions (Powell,
2000). Zinc also induces the expression of cystein rich
antioxidant protein metallothionein (Dhawan and Goel,
1995). And metallothionein plays a role in the
detoxification of heavy metals and stabilize membrane
(Vallee and Falchuk, 1993). Zinc is an important
component of the body’s antioxidant system and play a
role in retarding the oxidative processes particularly
related to diabetes mellitus. Specifically, Zinc is required
for the adequate formation and function of the antioxidant
enzyme copper-zinc superoxide dismutase (CuZnSOD),
and various metallothioneins (Disilvestro, 2000).
Zinc is suspected as having a significant role in
normal insulin metabolism. This includes the ability to
regulate insulin receptor intracellular events that
determine glucose tolerance and the ability to support
normal pancreatic reaction to a glucose load (Chausmer,
1998; Faure et al., 1995). Since the complications of
diabetes may be mediated, at least in part, through
oxidative stress, which potentially affect the heart,
vascular system, kidney, retina and peripheral nerves; zinc
play a key role in the cellular antioxidative defense
(Arthur, 1998; Bonnefont-Rousselot, 2004).
Therefore,this study was aimed at evaluating the
ameliorative effects of vitamin C and zinc on blood
glucose levels and oxidative stress in Alloxan-induced
diabetic Wistar rats.
MATERIALS AND METHODS
Chemicals and drugs used: This study was conducted in
the Department of Human Physiology, Faculty of
Medicine, Ahmadu Bello University Zaria, Kaduna state
in Northern Nigeria in the month of August, 2011. All
chemicals and drugs used were of analytical grade.
Alloxan was purchased from (Sigma chemical Company
St. Louis U.S.A.). A digital glucometer (Accu-Chek
Advantage, Roche Diagnostic, Germany) was used for the
determination of the blood glucose levels of the animals.
Each tablet of ascorbic acid (100 mg; Med Vit C® ,Dol-
Med Laboratories Limited,Lagos, Nigeria was
reconstituted to 100 mg/mL suspension, just prior to its
daily administration. Zinc gluconate tablet (50 mg/tablet,
Nature field U.S.A) was obtained from a pharmaceutical
store in Zaria, Nigeria. They were reconstituted in
distilled water prior to daily administration.
Animal care and management: A total of thirty (30)
apparently healthy Wistar albino rats of both sexes
between the ages of 8-10 weeks old and weighing
between 150-200 g were used for the study. The animals
were kept in well aerated laboratory cages in the
Department of Human physiology animal house and were
allowed to acclimatize to the laboratory environment for
a period of 2weeks before the commencement of the
experiment. They were maintained on standard animal
feeds and drinking water ad libitum.
Induction of experimental diabetes mellitus: The
animals were fasted for 16-18 h with free access to water
prior to the induction of diabetes. Diabetes was induced
by single intraperitoneal injection of Alloxan
monohydrate (Sigma St. Louis, U.S.A.) at a dose of 150
mg/kg b w dissolved in 0.9% cold normal saline solution
into 16-18 h fasted rats (Katsumata et al., 1999). Since
Alloxan is capable of producing fatal hypoglycemia as a
result of massive pancreatic insulin release, rats were
treated with 20% glucose solution orally after 6 h. The
rats were then kept for the next 24 h on 5% glucose
solution bottles in their cages to prevent hypoglycemic
(Dhandapani et al., 2002)..
Experimental design: After 72 h of Alloxan treatment,
blood was collected from tail vein of the rats. Rats having
fasting blood glucose level greater than 200 mg/dL were
considered as diabetic (Stanley and Venugopal, 2001).
After induction of diabetes the diabetic animals were
randomly divided into different group as follows:
CGroup 1: Normal rats and received distilled water
orally
CGroup 2: Diabetic untreated Wistar rats and were
given 1 mL of distilled water orally daily.
CGroup 3: Diabetic treated 100 mg/kg body weight of
Vitamin C orally daily
CGroup 4: Diabetic and received 50 mg/kg body
weight of Zinc orally daily
Determination of blood glucose levels: All blood
samples were collected from the tail vein of the rats at
intervals of 0, 1, 3, 5 and 7 day. Fasting blood glucose
levels were determined by using glucose oxidase method
Curr. Res. J. Bio. Sci., 4(2): 123-129, 2012
125
0
50
100
150
200
250
300
350
400
450
Day 0 Day 1 Day 3 Day 5 Day 7
Period of treatment
B
lood
G
lucose level (
m
g/dl)
Normal control
Diabetic control Diabetic + Vit.C
Diabetic + Zinc
0
Groups treated
Normal control
Diabetic control
Diabetic + Vit.C
(100 mg/kg)
Diabetic + Zinc
(50 mg/kg)
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
Mean seru
m
concentration of
Malondialdehyde (mmol/L)
(Beach and Turner, 1958) using a digital glucometer
(Accu-Chek Advantage, Roche Diagnostic, Germany) and
the results were expressed in the unit of mg/dL (Rheney
and Kirk, 2000).
Evaluation of serum malonaldehyde concentration:
Blood samples were drawn from the heart of the animals
via cardiac puncture and collected in centrifuge tubes and
were allowed to clot and the serum separated by
centrifugation using Denley BS400 centrifuge (England)
at 3000 rpm for 10 min and the supernatant (serum)
collected. Lipid peroxidation as evidenced by formation
of TBARS was measured by the modified method of
Niehaus and Samuelson (1968) and described by Akanji
et al. (2009). Briefly, The following reagents were mixed;
TBA (0.37%, i.e., 0.37 g/100 mL), TCA (15%) and HCL,
the working reagent was obtained. The serum (0.15 mL)
added to working reagent (0.2 mL) in each centrifuge
tube. Tubes were placed in water bath at 90 degree for 60
min (1 hour). They were removed to room temperature
and centrifuged at 3000 rmp for 5 min. The supernatant
was decanted and absorbance read at 535 nm. Absorbance
was read against a blank (containing 0.15 mL distilled
water instead of serum).
Statistical analysis: Blood glucose and serum
malondialdehyde levels were expressed in mg/dL and
mmol/L as mean±SEM. The data were statistically
analyzed using ANOVA with multiple comparisons
versus control group (Duncan et al., 1997). The value of
p<0.05 was taken as significant.
RESULTS
Effects of vitamin C and zinc on blood glucose levels in
alloxan-induced diabetic wistar rats: The Mean blood
glucose levels on day 0 indicates the fasting blood glucose
before the commencement of treatment. The oral
administration of 100 mg/kg body weight of vitamin C
showed no statistically significant change (p>0.05) on
blood glucose level after day 1, when compared to the
diabetic control group. Also, in the group treated with 50
mg/kg body weight of zinc there was also no statistically
significant difference (p>0.05) on blood glucose level
after day 1 when compared to the control group. While
after day 3 there was a significant decrease (p<0.05) on
the blood levels in the diabetic group administered with
100 mg/kg body weight of vitamin C and 50 mg/kg body
weight of Zinc when compared to the control group. In
addition, there was a statistically significant change
(p<0.05) on the blood glucose level in the groups treated
with 100 mg/kg body weight of vitamin C and 50 mg/kg
body weight of zinc after day 5 and day 7 as shown in
Fig. 1.
Fig. 1: Effects of vitamin C and zinc on blood glucose levels of
alloxan-induced diabetic wistar rats. (Bars represent
mean±SEM) (n = 5) for each group. Values are
statistically significant compared to control group at a:
p<0.05; ns: not significant
Fig. 2: Effect of vitamin C and zinc on malondialdehyde
concentration of alloxan-induced diabetic wistar rats.
(Bars represent mean±SEM) (n = 5) for each group.
Values are statistically significant compared to control
group at a: p<0.05; ns: not significant
Effect of vitamin C and vinc serum malondialdehyde
concentration in alloxan-induced diabetic wistar rats:
The study showed that there was no statistically
significant change (p>0.05) on the serum concentration of
MDA in the group treated with Vitamin C (100 mg/kg b
w) as compared to the diabetic control group. However,
there was a statistically significant change (p<0.05) on the
serum level of MDA in the group that was administered
with Zinc (50 mg/kg b w) when compared to diabetic
control group as shown in Fig. 2.
DISCUSSION
Diabetes mellitus is a metabolic disorder in the
endocrine. This dreadful disease is found in all parts of
the world and is becoming a serious threat to mankind
(Edwin et al., 2008). It has now become an epidemic with
Curr. Res. J. Bio. Sci., 4(2): 123-129, 2012
126
a worldwide incidence of 5% in the general population.
The number of adults with diabetes mellitus in the world
will rise from 135 million in 1995 to 300 million in the
year 2025 (Torben, 2002). Diabetes is a chronic metabolic
disorder involving carbohydrate, proteins and fat
characterized by hyperglycemia and insufficiency
secretion or action of endogenous insulin (Devlin, 1997;
Barar, 2002). Although the etiology of this disease is not
well defined, viral infection, autoimmune disease, and
environmental factors have been implicated (Shewade
et al., 2001). Pancreas is the primary organ involved in
sensing the organism’s dietary and energetic states via
glucose concentration in the blood and in response to
elevated blood glucose, insulin is secreted. Alloxan is one
of the usual substances used for the induction of diabetes
mellitus apart from streptozotocin. Alloxan has a
destructive effect on the beta-cells of the pancreas (Prince
and Menon, 2000; Jelodar et al., 2003). Alloxan and the
product of its reduction, dialuric acid, establish a redox
cycle with the formation of superoxide radicals. These
radicals undergo dismutation to hydrogen peroxide with
simultaneous massive increase in cystolic calcium
concentration, which causes rapid destruction of
pancreatic beta-cells of Islets of Langerhans thereby
inducing hyperglycemia (Grover et al., 2000; Szudelski,
2001). Insulin deficiency leads to various metabolic
alterations in the animals such as increased blood glucose,
total cholesterol, alkaline phophatase and transaminases
(Begum and Shanmudnaram, 1978). Therefore, alloxan
induced diabetes represent a good model for the study of
insulin dependent diabetes mellitus. Increased oxidative
stress is a widely accepted participant in the development
and progression of diabetes mellitus and its complications
(Baynes and Thorpe, 1990; Baynes, 1991; Ceriello, 2000).
In diabetes mellitus, oxidative stress seems mainly to be
due to increased production of free radicals and/or a sharp
reduction of antioxidant defenses (Ahmed, 2005a, b).
Oxygen derived free radicals have been implicated in the
pathology of various disease states, including diabetes
mellitus (Giugliano et al., 1996). Free radical production
caused by hyperglycemia occurs at least via four different
routes viz: auto-oxidation of glucose, increased
glycolysis, intracellular activation of sorbitol (polyol)
pathway and non enzymatic protein glycation (Ceriello
et al., 1992). Vitamin C is a water soluble antioxidant that
was firstly isolated and characterized by (Sato et al.,
1979). It is found intra-and extracellular as ascorbate
(Chihuailaf et al., 2002). Vitamin C is a natural
antioxidant that prevents the increased production of free
radicals induced by oxidative damage to lipids and
lipoproteins in various cellular compartments and tissues
as found in diabetes mellitus (Sies et al., 1992).
Zinc is the most abundant trace elements in the body
(Zhou et al., 2007). It contained in hundreds of enzymes
and even more protein domains participating in a number
of cellular processes, including cellular proliferation,
differentiation and apoptosis (Franco et al., 2009). It is
ubiquitous in subcellular metabolism and is an essential
component of catalytic site(s) of at least one enzyme in
every enzyme classification (Coyle et al., 2002). The
antioxidant effect of zinc has been well documented
(Moustafa, 2004). Apart from being an essential
component of the antioxidant enzyme, superoxide
dismutase, zinc also antagonizes the catalytic properties
of the redox active transition iron and copper in
promoting the formation of hydroxyl from hydrogen
peroxide and superoxide in Fenton reactions (Powell,
2000). Zinc also induces the expression of cystein-rich
antioxidant protein, metallothionein (Dhawan and Goel,
1995). The liver is an important insulin-dependent tissue,
which plays a pivotal role in glucose and lipid
homeostasis and is severely affected during diabetes
mellitus (Seifter and England, 1982).
The present study showed that blood glucose level
was increased in alloxan-induced animals, since alloxan
causes a massive reduction in insulin release, by the
destruction of beta-cells of Islet of Langerhans and hence,
inducing hyperglycemia (Ravikumar et al., 2010). And
also, there was increased serum concentration of
molandialdehyde (aldehydic products of lipid
peroxidation) which is a biomarker of intensed lipid
peroxidation and also indirect evidence high free radical
production in diabetes (Maritim et al., 2003). Oral
administration of antioxidant micronutrients and vitamins
(Vitamin C100 mg/kg and zinc 50 mg/kg) resulted in a
significant decrease in the levels of blood glucose and
serum concentration of MDA. Low levels of plasma
vitamin C are known to occur in several conditions of
increased oxidative stress such as diabetes mellitus
(Evans, 2000; Polidori et al., 2001; Jaruga et al., 2002).
Zinc has been reported to play a key role in the regulation
of insulin production in pancreatic tissue. Therefore, it
seems reasonable that any change in body zinc status
could affect production, storage and secretion of insulin.
Several reasons have been adduced that abnormal zinc
metabolism could play a role in the pathogenesis of
diabetes mellitus, which is accompanied by severe
oxidative stress (especially lipid peroxidation) as result of
an increased oxygen free radical production (Feillet-
coudray et al., 1999; Zine kachrid and Naima, 2007). Free
radicals have been reported in the pathogenesis of
diabetes mellitus as a result of their severe cytotoxic
effects, such as lipid peroxidation and protein
denaturation of the cell membrane followed by alteration
of the membrane receptor and fluidity properties (Gupta
and Chari, 2005). Zinc is one of the important micro
elements among magnesium, copper, manganese needed
for the beta-cells (Mohommed et al., 2006; Edwin et al.,
2008). Therefore, dietary supplementation with the
antioxidants (vitamin C and Zinc) has been suggested as
a possible means of controlling diabetes and its
Curr. Res. J. Bio. Sci., 4(2): 123-129, 2012
127
complications as well as damage to lipids by oxygen
radicals (Trancrede et al., 1983; Martinek, 1964). Marvin
et al. (1985) reported that supplementation of vitamin E
might alter insulin receptors in muscle or adipose tissue
by increasing membrane motility. In addition, vitamin E
may enhance glucose uptake by the diaphragm. This
therefore, may be possible mechanism for the reduction of
blood glucose vitamin C observed in this present study.
Furthermore, zinc induces the production of
metallothionein, an effective scavenger of hydroxyl
radicals (Sahin and Kucuk, 2003). While vitamin C is a
scavenger of free oxygen radicals which are toxic by-
product of many metabolic process in streptozotocin-
induced diabetes (Gupta and Chari, 2005; Manea et al.,
2004). Therefore, the decrease in the level of blood
glucose observed in this present study may be attributed
the antioxidant effects of vitamin C and zinc on these free
radicals.
CONCLUSION
In conclusion, the present study have revealed that
oral administration of vitamin C (100 mg/kg b w) and
Zinc (50 mg/kg b w) reduced blood glucose levels and
lipoperoxides formation as evidenced by reduction in the
serum concentration of malondialdehyde in alloxan-
induced hyperglycemia in Wistar rats.
ACKNOWLEDGMENT
The authors of this research study wish to
acknowledge the technical assistance of Mallam Bashiru
M. of the Department of Biochemistry Ahmadu Bello
University, Zaria, Nigeria.
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