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Int. J Diabetes & Metabolism (2005) 13: 18-23
18
Anti-hyperglycaemic and anti-dyslipidaemic effect of dietary supplement of
white Ocimum Sanctum Linnean before and after STZ-induced diabetes
mellitus
Thamolwan Suanarunsawat1* and Thanapat Songsak2
Physiology Unit, Department of Medical Sciences, Faculty of Sciences, Rangsit University, Paholyotin Rd.,Thailand,
120001Department of Pharmacognosy, Faculty of Pharmacy, Rangsit University, Paholyotin Rd.,Thailand, 120002
________________________________________________________________________________________________________
Abstract
This study was conducted to elucidate whether dietary treatment of white Ocimum sanctum Linnean. (OS) either before or after
streptozotocin (STZ) - induced diabetes has anti-hyperglycemic and anti-dyslipidaemic action. Two series of experiments were
performed. The first involved three groups of rats; one group was fed normal diet for 6 weeks, a second diabetic group received
normal diet and a third diabetic group received 2 % dietary OS from 3 weeks after induction of diabetes for a period of 3 weeks.
The second involved three groups of rats: one group was fed normal diet, a second group received or did not receive 2 % dietary
white OS before induction of diabetes. Fasting blood glucose was determined before and after induction of diabetes. At the end
of the study, arterial blood was collected to evaluate serum triglyceride, total cholesterol, HDL-cholesterol, LDL-cholesterol,
serum aspartate aminotransferase (AST), serum alanine aminotransferase (ALT) and creatinine. The results show that blood
glucose was not significantly altered after 3 weeks of dietary supplement of white OS in diabetic rats. In contrast, elevated blood
glucose after 3 weeks of diabetes was alleviated in diabetic rats pretreated with white OS. STZ-induced diabetes significantly
raised serum triglyceride, total cholesterol, LDL-cholesterol, AST, ALT and creatinine. White OS supplementation, either before
or after induction of diabetes, normalized lipid profile and creatinine and partially reduced an elevated serum AST and ALT. It
can be concluded that STZ-induced hyperglycaemia can be ameliorated by pretreatment with white OS. Dietary supplement with
OS either before or after diabetic induction reverses dyslipidaemia and renal glomerular filtration function, and partially protects
liver function.
Key words: diabetes mellitus, serum lipid, Ocimum sanctum Linnean.
Introduction
Diabetes mellitus (DM) is a serious metabolic disease which
has several complications including diabetic nephropathy,
diabetic neuropathy, coronary heart disease and hypertension.1
It has been estimated that by the year 2010, the prevalence of
DM worldwide will reach approximately 240 million.2
Patients with DM are more likely to develop and die from
microvascular and macrovascular complications than the non-
diabetic population.3 There is usually an association between
coronary heart disease or atherosclerosis and dyslipidaemia.4,5
Dyslipidaemia is a frequent complication of DM and is
characterized by low levels of HDL-cholesterol and high
levels of LDL-cholesterol and triglyceride. Several groups of
hypoglycaemic drugs are currently available to treat DM.
However, their toxic side effects and sometimes diminution in
response after prolonged use are problematic. Management of
______________________________
Correspondence to: Thamolwan Suanarunsawat, Physiology Unit,
Department of Medical Sciences, Faculty of Sciences, Rangsit University,
Praholyothin Rd., Thailand, 12000. Tel : 662-9972222 ext 1473, Fax : 662-
9972222 ext 1417, e-mail : thamolwa@rangsit.rsu.ac.th
DM to avoid these problems is still a major challenge. There
is an ongoing search for natural products with anti-
hyperglycaemic and anti-dyslipidaemic activities with
minimal side effects. There are several kinds of medicinal
plants in Thailand which have been reported to exert anti-
hyperglycaemic and/or anti-dyslipidaemic actions.6 Among
them, Ocimum sanctum Linnean. (OS) is very promising since
it is routinely used as a vegetable and also for the treatment of
DM by local people in various countries including India and
Thailand. Several studies have demonstrated that OS
possesses anti-hyperglycaemic and/or anti-dyslipidaemic
effect in normal and DM animals.7-10 Preliminary studies in
our laboratory have shown that white OS exerts hypoglycemic
action in normal rats whereas red OS was without this effect.
We have investigated whether supplementation of diet with
white OS can retard dyslipidaemia and hyperglycaemia in
diabetes.
Materials and methods
Animal preparation
Male Wistar rats weighing between 180-220 g from Animal
Center, Salaya Campus, Mahidol University, were used in the
Suanarunsawat & Songsak
19
Table 1: Changes in body weight, food intake and fasting blood glucose in rats fed with or without white Ocimum sanctum Linnean. (OS)
during the last three weeks of the study.
Before feeding with or without OS After feeding with or without OS
1 wk 3 wk 1 wk 3 wk
Body weight (g)
Group 1 200.00 ± 3.32 274.00 ± 5.05 300.86 ± 8.02** 351.14 ± 10.69***
Group II 212.57 ± 4.73 221.71 ± 6.55 233.14 ± 7.23* 231.14 ± 6.95*
Group III
180.86 ± 4.20 194.57 ± 4.48 196.57 ± 4.47 213.43 ± 6.19**
Food Intake (g/24 hr)
Group 1 20.57 ± 1.36 22.29 ± 2.28 22.29 ± 2.69 24.14 ± 1.35
Group II 35.00 ± 3.31 41.86 ± 2.62 43.71 ± 1.30 45.86 ± 1.10
Group III
35.28 ± 3.04 37.43 ± 2.24 37.86 ± 2.20 37.14 ± 2.99
Blood glucose (mg/dl)
Group 1 84.71 ± 3.01 99.00 ± 4.92 105.14 ± 4.05 100.43 ± 1.66
Group II 250.71 ± 19.20 318.14 ± 24.18 310.86 ± 25.20 357.28 ± 26.30
Group III
230.29 ± 28.47 279.28 ± 23.08 305.86 ± 27.82 326.00 ± 28.46
Values are shown as mean ± SEM.
group I = normal control rats , group II = diabetic rats fed normal diet, group III = diabetic rats fed with white Ocimum sanctum Linnean.
* significant difference comparing to the third week before white OS treatment (*P<05, **P<0.01, ***P<0.001).
Table 2: Changes in serum lipid profile, serum aspartate aminotransferase (AST), serum alanine aminotransferase (ALT) and serum creatinine
(Cr) in rats fed with or without white Ocimum sanctum Linnean. during the last three weeks of this study.
Group I Group II Group III
Triglyceride (mg/dl) 95.62 ± 11.49 219.02 ± 24.99* 108.98 ± 14.88 #
Total Cholesterol (mg/dl) 86.29 ± 8.48 208.27 ± 32.65*** 97.84 ± 6.52 #
HDL Cholesterol (mg/dl) 46.86 ± 5.79 39.36 ± 3.59 50.76 ± 3.51
LDL Cholesterol (mg/dl) 27.84 ± 1.97 41.76 ± 4.61* 27.56 ± 3.54#
AST(unit/L) 30.79 ± 2.16 57.50 ± 4.07* 45.79 ± 3.72a
ALT (unit/L) 23.00 ± 2.68 60.71 ± 3.83*** 44.29 ± 4.55#b
Cr (mg/dl) 1.04 ± 0.04 1.96 ± 0.18** 1.21 ± 0.08##
Data are presented as mean ± SEM
Abbreviations for each group are shown in table I
* significant difference comparing to group I (* P<0.05 , ** P<0.01 ,*** P<0.001).
# significant difference comparing to group II (# P< 0.05 , ## P<0.01 )
a ,b significant difference comparing to group I at P< 0.05 and P<0.01 respectively
study. Rats were housed in a 12-hr light-dark cycle at 25 ± 2
°C and fed normal rat food and tap water ad libitum. All
animals were cared for in accordance with the principles and
guidelines of the Institutional Animal Ethics Committee of
Rangsit University, which is under The National Council of
Thailand for Animal Care. Induction of diabetes was carried
out by intraperitoneal injection of STZ (Sigma, St Louis, MO,
USA) dissolved in citrate buffer pH 4.5 at a dose of 70 mg/kg
bodyweight. Two days after STZ injection blood glucose was
measured and only those rats with fasting blood glucose >170
mg/dl were included in the study
Preparation of white Ocimum sanctum Linnean
Fresh leaves of white OS obtained from The Ministry of
Public Health, Thailand, were washed in tap water and then
left to dry at room temperature for 2-3 days. The dried leaves
were then ground to fine powder in a mixer. The dried leaf
powder was then added to the diet to makeup 2 % of the diet.
Experimental design
Two series of experiments were performed.
Series I: The effect of dietary supplement of white OS on
blood glucose and serum lipid 3 weeks after induction of
diabetes
Three groups of 7 rats were used as follows:
Group I: Control rats fed with normal diet for 6 weeks. The
normal diet contained protein 23.5 %, fat 4.4 %, fibre 4.9 %,
mineral and vitamin 6.4 %, moisture 12 % and carbohydrate
46.8 % with added corn starch 2 %.
Group II: Diabetic rats fed with normal diet throughout 6
weeks.
Group III: Diabetic rats fed with normal diet for 3 weeks and
then switched to normal diet with 2 % white OS which
replaced the corn starch.
Body weight, food consumption and fasting blood glucose
were determined at the first and third week after the start of
Antihyperglycaemic and anti-dyslipidaemic effect of white Ocium Sanctum Linnean
20
Table 3 The alterations of body weight, food intake and fasting blood glucose in rats pretreated with or without white Ocimum sanctum
Linnean. (OS) for three weeks before diabetic induction.
Before induction of Diabetes After induction of Diabetes
1 wk 3 wk 1 wk 3 wk
Body weight (g)
Group A 200.00 ± 3.32 274.00 ± 5.05 300.86 ± 8.02** 351.14 ± 10.69***
Group B 193.83 ± 2.76 238.00 ± 1.89 231.003.68 232.67 ± 4.28
Group C
198.00 ± 5.93 249.67 ± 6.39 240.00 ± 7.90 245.67 ± 11.51
Food Intake (g/24 hr)
Group A 20.57 ± 1.36 22.29 ± 2.28 22.29 ± 2.69 24.14 ± 1.35
Group B 23.83 ± 1.19 28.00 ± 1.63 24.83 ± 2.36 48.83 ± 5.57**
Group C
27.00 ± 2.57 28.83 ± 2.55 24.33 ± 4.68 38.83 ± 1.14*
Blood glucose (mg/dl)
Group A 84.71 ± 3.01 99.00 ± 4.92 105.14 ± 4.05 100.43 ± 1.66
Group B 89.67 ± 1.64 90.83 ± 1.00 260.50 ± 14.37*** 336.33 ± 10.76***
Group C
85.67 ± 4.37 89.00 ± 1.17 211.83 ± 24.36** 243.67 ± 29.29**a
Values are given as mean ± SEM.
group A = normal control rats.
group B = diabetic rats without white Ocimum sanctum Linnean pretreatment
group C = diabetic rats with white Ocimum sanctum Linnean pretreatment and continued until end of experiment
* significant difference comparing to the third week before diabetic induction (*P<0.05 , **P<0.01, *** P<0.001)
a significant difference comparing to group B at the same period at P< 0.05
Table 4 Changes of serum lipid profile, serum aspartate aminotransferase (AST), serum alanine aminotransferase (ALT) and serum creatinine
(Cr) in rats pretreated with or without white Ocimum sanctum Linnean (OS) for 3 weeks before induction of diabetes.
Group A Group B Group C
Triglyceride (mg/dl) 95.62 ± 11.49 224.37 ± 17.97*** 114.49 ± 20.31##
Total Cholesterol (mg/dl) 86.29 ± 8.48 114.72 ± 5.60* 74.96 ± 6.79##
HDL Cholesterol (mg/dl) 46.86 ± 5.79 40.19 ± 2.07 39.08 ± 3.12
LDL Cholesterol (mg/dl) 27.84 ± 1.97 40.39 ± 1.23** 34.26 ± 2.06#
AST unit/L 30.79 ± 2.16 72.58 ± 3.22*** 40.29 ± 2.39####a
ALT (unit/L) 23.00 ± 2.68 63.17 ± 1.92 *** 38.57 ± 4.77 ####a
Cr (mg/dl) 1.04 ± 0.04 1.93 ± 0.25*** 0.88 ± 0.07##
Data are presented as mean ± SEM
Abbreviations for each group are shown in table 2
* significant difference comparing to group A (*P<0.05 , ** P<0.01, *** P<0.001)
#,##,### significant difference comparing to group B at P<0.05, P<0.01 and P<0.001 respectively.
a significant difference comparing to group A at P<0.05.
the study. After 1 and 3 weeks of either white OS or normal
diet treatment, body weight, food consumption and fasting
blood glucose were again measured. At the end of the
experiments rats were fasted overnight and then arterial blood
was collected from abdominal aorta to determine serum lipid
profile (triglyceride, cholesterol, HDL-cholesterol and LDL-
cholesterol). To determine whether dietary supplementation
with white OS affects liver and kidney function, serum
aspartate aminotransferase (AST), serum alanine
aminotransferase (ALT) and serum creatinine were measured.
Series II: Effect of pretreatment with white OS on blood
glucose and serum lipid in diabetic rats
Three groups of seven rats each were used as follows:
Group A: Control rats treated with normal diet for 6 weeks.
Group B: Rats were fed with normal diet for 3 weeks, and
then injected with STZ. Normal diet was supplied for
remainder of the study.
Group C: As for Group B except 2 % of white OS in diet was
provided both before and after induction of diabetes.
In order to prevent experimental error owing to STZ injection
in group B and C, only rats with fasting blood glucose >140
mg/dl were included in the study.
Body weight, food intake and fasting blood glucose were
determined at the first and third week after the beginning of
the experiment, and then again after 1 and 3 weeks of
diabetes. At the end of the experiment rats were fasted
Suanarunsawat & Songsak
21
overnight and blood was collected from the abdominal aorta
to determine serum lipid profile, AST, ALT and creatinine.
Biochemical assay
Fasting blood glucose was determined by blood glucose strip
(Medisense UK Ltd, Abbott Lab, UK). Serum lipid profile,
creatinine, AST and ALT were determined using an
enzymatic kit (Human, Gesellschaft Für Biochemica und
Diagnostica mbH, Germany)
Data and Statistical Analysis
Data are presented as mean ± SEM. The results were
analyzed for statistical significance by ANOVA using SPSS
version 10. Significant difference was accepted at the P <
0.05.
Results
Effect of dietary supplement of white OS on blood glucose
and serum lipid after 3 weeks of diabetes
Table 1 shows the changes in body weight, food intake and
fasting blood glucose in the rats before and after being fed
with either normal diet or diet with white OS after 3 weeks.
There was no significant change in food intake and blood
glucose in both groups of diabetic rats with or without white
OS. Also, no significant difference in blood glucose was noted
in both groups of diabetic rats with or without white OS.
Serum lipid profiles of rats with or without white OS during
the last 3 weeks are shown in Table 2. Triglyceride and total
cholesterol were significantly raised from 95.62 ± 11.49 and
86.29 ± 8.48 in normal control to 219.02 ± 24.99 (P < 0.05)
and 208.27 ± 32.65 mg/dl (P < 0.01), respectively in diabetic
rats fed normal diet. Three weeks of dietary supplementation
of white OS to diabetic rats returned the high level of both
triglyceride and cholesterol to a level that was not significant
by difference from normal control rats (108.98 ± 14.88 and
97.84 ± 6.52 mg/dl, respectively). HDL-cholesterol was
lowered in diabetic rats (39.36 ± 3.59) but the level was not
significant by difference from normal control rats (46.86 ±
5.79). White OS feeding to diabetic rats slightly raised HDL-
cholesterol but the magnitude was not statistically significant
by difference from normal diabetic rats. The elevation of
LDL-cholesterol in normal diabetic rats (41.76 ± 4.61 mg/dl)
was normalized after 3 weeks of white OS supplementation (P
<0.05). White OS supplementation alleviated an augmentation
of both serum AST and ALT but the level remained higher
than that of normal control rats. White OS feeding reduced an
elevation of serum creatinine in diabetic rats fed normal diet
(1.96 ± 0.18 mg/dl) to the level that was statistically not
significantly different from normal control rats (1.21 ± 0.08
mg/dl).
Effect of pretreatment of dietary white OS on blood glucose
and serum lipid in diabetic rats
The alterations of body weight, food intake and blood glucose
in rats pretreated with or without white OS before diabetic
induction are illustrated in Table 3. Although there was no
significant change in body weight there was an increased
food intake after the onset of diabetes. Blood glucose was
significantly raised from 90.83 ± 1.00 to 260.50 ± 14.37 mg/dl
(P < 0.001) and 89.00 ± 1.17 to 211.83 ± 24.36 mg/dl (P <
0.01) one week after STZ injection in rats pretreated with or
without white OS, respectively. There was only one rat from
each group of diabetic rats in which fasting blood glucose was
lower than 140 mg/dl after STZ injection and hence, was
excluded from the study. The magnitude of blood glucose
elevation after 1 week of STZ injection in rats pretreated with
white OS was slightly lower than that of another group but the
level was not statistically significantly different. Three weeks
after induction of diabetes, blood glucose in rats pretreated
with white OS was significantly lower than that of diabetic
rats without white OS treatment (P <0.05).
Similar to the first series of experiments, pretreatment with
white OS for 3 weeks before induction of diabetes reduced
the elevated levels of triglyceride, total cholesterol and LDL-
cholesterol to a level which was statistically not significantly
different from normal control rats (table 2). Pretreatment
with white OS for 3 weeks before induction of diabetes
alleviated an augmentation of AST, ALT and normalized
serum creatinine.
Discussion
Ocimum sanctum Linnean (OS) is a medicinal plant
distributed mainly in the tropical and subtropical regions
including Thailand. Besides being widely used as a vegetable
it has also been used as an indigenous medicine in several
other countries in Asia and Africa11, particularly for its
hypoglycaemic and anti-dyslipidaemic effects in diabetes.7-10
However, these effects were displayed only in very short-term
studies. However, DM is a chronic disease and most diabetic
patients do not know whether they are diabetic until
symptoms such as diuresis, polydipsia, polyphagia present
themselves.
Whether OS normalizes dyslipidaemia and/or hyperglycaemia
after longer periods of diabetes is not known. From the
present results, 3 weeks of dietary supplement with white OS
to the rats after induction of diabetes for 3 weeks, had no
significant effect on blood glucose. This experimental result
was quite different from other studies7,12 which showed a
glucose-lowering action of OS. This inconsistency of data
could be for a variety of reasons. The study of Vats et al12 and
Chattopadhyay and his colleagues7 orally fed diabetic rats
with the aqueous extract of OS leaves whereas dietary
supplement of crude OS leaves was used in our study. The
aqueous extract of OS may have much more active ingredients
than crude dry leaves. However, it is quite difficult to mix
extracts of OS into the diet since it was a thick paste and is
sticky in nature. Furthermore, daily oral feeding with the
aqueous extract of OS for 3 weeks was likely to be stressful to
the rats. Of particular interest is that oral feeding of the
aqueous extract of OS begun during an early period after STZ
Antihyperglycaemic and anti-dyslipidaemic effect of white Ocium Sanctum Linnean
22
or alloxan injection whereas it was given after induction of
diabetes for 3 weeks in the present study. Moreover it has
been shown that hypoglycemic activity of aqueous extract of
OS is different in rats with different degrees of
hyperglycaemia induced by STZ or alloxan injection. The
greater the degree of hyperglycaemia the lesser the
hypoglycemic effect of aqueous extract of OS.12,13 In this
study, the blood glucose level in diabetic rats before white OS
treatment was approximately 300 mg/dl whereas in other
studies it was 140-300 mg/dl. It has been suggested that the
anti-hyperglycaemic effect of OS is at least partially
dependent on insulin release from β–cells as shown by a
greater anti-hyperglycaemic activity in mild hyperglycaemia
and lower response in moderate hyperglycaemia.13 Prolonged
hyperglycaemia along with severe hyperglycaemia as
occurred in the present study, may be the cause of failure of
glucose lowering action of OS.
Though dietary supplementation of white OS after induction
of diabetes had no glucose lowering effect, it reduced
hyperglycaemia in rats pretreated with white OS. The reason
why pretreatment with white OS in diabetic rats resulted in
the reduction of hyperglycaemia and treatment with white OS
3 weeks after induction of DM is unclear. It may be that
pretreatment of white OS before induction of diabetes caused
a gradual accumulation of active ingredients which may have
been enough to act against STZ-induced β-cells causing
damage by increasing islet superoxide dismutase activity,14
and then alleviating hyperglycaemia after STZ injection.
One of the most critical complications of DM is
atherosclerosis and coronary heart disease which are the result
of abnormal lipid metabolism.4 It has been reported that the
lipid profile of DM is characterized by low levels of HDL-
cholesterol, and elevated LDL-cholesterol and triglyceride
levels.4,15 This combination is often termed diabetic
dyslipidaemia. LDL carries cholesterol from the liver to the
peripheral cells and smooth muscle cells of arteries. A rise in
LDL may cause deposition of cholesterol in arterial walls and
hence promote atherosclerosis and coronary heart disease. In
the present study, not only pre-treatment but also post-
treatment with white OS normalized dyslipidaemia in diabetic
rats. This observation indicates that dietary supplement of
white OS either before or after induction of diabetes may be
effective at preventing and/or ameliorating atherosclerosis and
coronary heart disease. It is interesting to note that dietary
supplementation with white OS exerted different effects on
blood glucose but showed the same effect on lipid profile.
This indicates that recovery of dyslipidaemia in diabetic rats
treated with white OS is independent of blood glucose levels
and that glucose lowering activity and anti-dyslipidemic
activity may be provided by different active ingredients in OS.
OS leaves have been reported to contain several chemicals
including ursolic acid, apigenin, luteolin, orientin,
moludistin.16 It is widely known that OS leaves are rich in
essential oils, particularly eugenol.17 Currently no
experimental data has clearly supported an anti-
hyperglycaemic and anti-dyslipidemic mechanism for white
OS. Moreover, it is not clear which of its constituents or
combination of these constituents are responsible for the anti-
hyperglycemic and anti-dyslipidaemic effects.
In the living system, the liver and kidney are highly sensitive
to toxic or foreign agents. It is widely known that renal
glomerular capillaries and hepatic cells damage are often
found in DM. To assess experimental liver damage, serum
AST and ALT, which are more abundant in liver, were
determined. It was observed that dietary supplementation
with white OS either before or after induction of diabetes
partially reversed elevated serum AST and ALT, implying
that the magnitude of hepatic cell damage was reduced.
Eugenol, a major essential oil in OS, may contribute to this
action since it has been shown that oral administration of
eugenol reduced iron-induced hepatic damage.18 Dietary
treatment of OS also normalized a high level of serum
creatinine in diabetic rats, indicating its protective effect on
renal glomerular filtration ability.
In summary, dietary supplementation with white OS for 3
weeks after 3 weeks of diabetes had no significant effect on
blood glucose. In contrast, pre-treatment with white OS for 3
weeks before induction of diabetes reduced STZ-induced
hyperglycaemia. Dietary treatment of white OS either before
or after induction of diabetes significantly reduced the
elevated serum lipid profile, serum enzyme AST, ALT and
creatinine. The findings from this study indicate that STZ-
induced hyperglycaemia can be ameliorated by pre-treatment
with white OS. Dyslipidaemia is normalized in diabetic rats
supplemented with white OS either before or after induction
of diabetes. White OS also partially protects hepatic cell
damage and reverses renal glomerular filtration dysfunction in
diabetic rats.
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