Research Article | Open Access

Nora Abdulaziz AL Jalaud

College of Science, Imam Abdulrahman Bin Faisal University, Dammam, Kingdom of Saudi Arabia.
J Pure Appl Microbiol, 2019, 13 (1): 465-473 | Article Number: 5448 | © The Author(s). 2019 

Received: 20/01/2019 Accepted: 02/03/2019 | Published: 27/03/2019

Diabetes mellitus has emerged as a pandemic affecting both the genders and all the age groups. This metabolic disorder is classically notorious to cause retinopathy, neuropathy, micro and macro vascular complications including brain damage, cardiac disorders and nephropathy and renders patients to develop various kinds of infections Ginger, Nigella sativa and Punica granatum are strong antioxidants and possess antimicrobial activity. While the Metformin is known to reduce the insulin resistance. In present study we examined the influence of Ginger, Nigella sativa, Punica granatum and Metformin on the prevention and treatment of bone damage and infections due to Diabetes Mellitus in STZ-induced diabetes in male Wistar albino rats. 40 rats were used in the study, and it was observed that all the studied substances prevented infections and bone damage at the same time, significant increase was found in the bone volume, strength, density, and length in comparison to diabetic rats.


Diabetes mellitus, Infection, Animal model, animicrobial activity.


Diabetes mellitus is a chronic metabolic condition that leads to a high plasma glucose levels1,2,3. Diabetes Mellitus primarily results from, defect in feed mechanism leading to disordered homeostasis, defect in the secretion of insulin or defective insulin resistance adjuvant to inadequate insulin secretion.

Type 2 diabetes mellitus is characterized by the inability of efficient insulin use, referred to as insulin resistance joined with an inability to secrete a ample amount of insulin to outcome the insulin resistance. T2DM usually leads to severe complications which involve the heart, blood vessels, eyes, kidneys, and nerves. It has also been observed that diabetes badly affects bone health.

DM is known to enhance and lengthen inflammation, that may add to enhanced bone breakdown. Diabetes Mellitus escalates osteoclast synthesis in a number of conditions including periodontal disease, fracture healing and osteoporosis4,5,6.

It was revealed that intraperitoneal administration of Nigella sativa (thymoquinone) significantly decreases hyperglycemia in STZ induced DM in the rats7.

It is widely known that, Metformin is the first-line pharmacotherapeutic agent for the pharmacological treatment of T2DM. It turns down the blood glucose levels, and that is due to decreasing hepatic gluconeogenesis and elevation of glucose intake by the skeletal muscle8,9.

It has been observed that metformin, an oral hypoglycemic agent and also an insulin sensitizer, ameliorates bone breakdown and rate of turnover. When treated with Metformin, T2 Diabetics have reduced risks of bone fracture10. The bone formation effects of metformin have been observed in cellular and experimental animals, mainly metformin augments bone formation and suppresses adipocyte differentiation in cultured rat model, marrow mesenchymal stem cells, most likely due to inhibition of PPARg, which is a nuclear receptor responsible for regulation off at and glucose metabolism11, metformin also stimulates trabecular bone synthesis by activation of AMPK signaling in osteoblastic cells, a leading intracellular pathway which senses energy deficiency12.

On the contrary, metformin straightly suppresses bilateral ovariectomy-induced bone damage in rats13 and osteoclastogenesis14, that is also demonstrated by a substantial decrease of serum bone resorption marker (-12.7%) in male diabetic patients using metformin15.

The effects of Thymoquinone on bone degradation, bone formation and bone healing as well as abnormalities related to bone has been reported in some fields. Thymoquinone (actie ingredient of Nigella Sativa) may be beneficial in osteogenesis16. Analysis of the physiological responses of Thymoquinone (Nigella Sativa) in the femoral defect animal model has shown continuous delivery of the drug and was successful in bone healing. It has been confirmed that the alveolar bone loss due to periodontitis reduces by gastric Thymoquinone when administered to rats. Thymoquinone (Nigella Sativa) also reduces the number of osteoclasts and increases osteoblastic activity17.

Moreover, it has been found that systemic use of Thymoquinone (TQ) in rats resulted in significant acceleration of bone development. Systemic administration of 10 mg/kg of TQ can boost bone synthesis and may prove to be good in preventing the relapse after the rapid maxillary expansion (RME) procedure. In consideration of potent antioxidant properties, Nigella Sativa (TQ) may prove to have a critical role in speedup bone formation. Nigella Sativa (TQ) reduces the ROS production and the consequent pro-inflammatory cytokines IL-1 and -6 and TNF-, cytokines that can add to the differentiation of osteoclast precursors and osteoclast activity leading to bone resorption18.

Infectious diseases are routinely found in patients who develops T2DM and are serious, causing significant increase in the morbidity and mortality. The higher prevalence of infections in diabetic patients is due to the increased blood glucose environment which favors immune disorder (e.g., destruction of neutrophil function, suppression of the antioxidant system, and humoral immunity), micro- and macro-angiopathies, neuropathy, reduction in the antimicrobial activity of urine, gastrointestinal and urinary disability, and frequent medical interventions in the patients. The infections affect all the organs and systems of a body. After all, majority of researchers conclude that there is clinical testimony pointing out to the greater incidence of infectious diseases among individuals suffering from Diabetes mellitus19,20,21.

Gingerols are one of the main ginger active components that cause inhibition of production of inflammation-causing prosta-glandins22. Possible effects of ginger which cause inhibition of hepatic phosphorylase is to decrease hepatic glycogenolysis and to increase activity of the enzymes that lead to progression of glycogenesis. Other probable effect of ginger may be suppression of the activity of hepatic glucose-6-phosphatase enzyme, that causes reduction in blood glucose levels23.

It has been found that ginger potential anti hyperglycemic that may also be due to its effects on serotonin receptors, in addition to increase in the pancreatic production of insulin from beta islets or release of bound insulin24.

Punica granatum L. (pomegranate) is a seasonal plant, which is widely spread as a source of conventional medicine25,26. The pomegranate fruit has medicinal effects like anti-inflammatory and antibacterial activities. The seed oil of pomegranate is rich in phytoestrogenic compounds and the fruit also contains in phenolic compounds with substantial anti-oxidant activity27.

Oxidative stress has an important role in the occurrence of complications in diabetes, especially type II DM28.

It has been found in several studies that Type II DM is linked with oxidative stress, which causes increased generation of free radicals, like superoxide radical, hydrogen peroxide, and hydroxyl radical, or reduced antioxidant immune mechanism29,30. The role of oxidative stress in the pathogenesis of DM is not only due to free radical production, but also due to non-enzymatic protein glycation, damaged antioxidant enzyme system and formation of peroxides31.

Free radicals are divided into reactive oxygen species (ROS), reactive Nitrogen species (RNS)32, and reactive chlorine species (RCS)33.

In some conditions, oxygen may be flowing in the cells when it generates reactive species which lead to necrosis and sequentially the cell end. RNS and RCS also cause oxidation by the proliferation of some tool which intrude with the normal physiological homeostasis in the cell34.

Materials and Methods

The present research was performed under  Research units of College of Science, Imam Abdulrahman Bin Faisal University, Dammam, Saudi Arabia  and Laboratory conditions at the department of Clinical Pharmacy, Faculty of Pharmacy, Northern Border University.

Acquirement of plant material
Ginger (Zingiber officinale), Seeds of Nigella sativa and Pomegranate (Punica granatum) were acquired from the regional market and the necessary preparations were done according to the research methodology.

Fourty adult Wistar albino male rats, of 8 weeks old and weighing 250±10g, were attained from the animal house of Faculty of Pharmacy, Northern Border University. Male rats were accommodated in temperature controlled rooms (25°C) with continuous moisture (40–70%) and 12h/12h light/ dark cycle before their use in experimental protocols.

All animals were looked upon according to the Principles of Laboratory Animal Care. The experimental protocol approval was got, according to the guide for the care and use of laboratory animals prepared by Deanship of Scientific Research, NBU.

All the Rats were nourished with standard diet and water. The daily input of animal water was checked at least once a week before the start of treatments in order to calculate the amount of water required per experimental animal.

Induction of Diabetes with STZ
The Type II DM was produced in the animals by a single intra peritoneal injection of streptozotocin (STZ, Sigma-Aldrich, St.Louis, MO, USA) in 0.1 M citrate buffer (pH 4.0) at a dose of 55 mg/kg body weight (Mahesh and Menon, 2004). Blood glucose levels and variance in body weight were checked regularly.

Ten groups of the Wistar male rats were made, each group having 4 animals, as follows:

Group 1: Control rats were given only 5cc Normal saline (0.9% NaCl).

Group2: Control rats were given ginger (100mg/kg/rat) daily.

Group 3: Control rats were given Nigella Sativa (80 mg/kg).

Group4: were given Metformin150 mg/kg/day.

Group 5: were given Punica 400 mg/kg/day.

Group 6: Diabetic control (55 mg/kg, single intra peritoneal injection of STZ).

Group 7: Diabetic group (55 mg/kg, single intra peritoneal injection of STZ) will receive 100 mg/kg/day ginger.

Group 8: Diabetic group (55 mg/kg, single intra peritoneal injection of STZ) Nigella Sativa 80 mg/kg/day.

Group 9: Diabetic group (55 mg/kg, single intra peritoneal injection of STZ) will receive Punica 400 mg/kg/day.

Group 10: Diabetic group (55 mg/kg, single intra peritoneal injection of STZ) will receive Metformin 150 mg/kg/day.

48 hrs after the induction of experimental diabetes mellitus, the experimental protocol was started.

Surgical procedure
At the end of 6th week (end of the treatment period, 24 hrs. after the last administration) the rats were sacrificed, after intra-peritoneal administration of sodium pentobarbital solution (40 mg/kg)as an anesthetic, and the long bones of limbs were taken. Immediately, from the control and experimental groups.

The weight of the bones for each group member was recorded. The animals were sacrificed by deep ether anesthesia. Disarticulation of fore and hind limbs from the axial skeleton was done with removal of soft tissue and fixation in 10% buffered formalin.

Microbiological examination of bone
After sacrifice, and removal of skin from long bones (Tibia), careful examination/inspection was done for any evidence of infection. The swabs were taken and cultured in Trypticase soy agar media (TSA), then incubated at 27°C for 72 hrs.

Histological Examination
Decalcification was done in 10% nitric acid (HNO3) and 10% formic acid (HCO2H) changes.

Following paraplast embedding, thick longitudinal sections of proximal 4 micron& distal long bone ends were cut with a rotary microtome.

The histological examination was done according to standard protocol.

Haemotoxylin and Eosin staining was performed. The results were analyzed statistically for evaluation of the significance.

Analysis of bone morphology, considered length, cross-sectional area, thickness, weight, volume, and density, were done according to Ahmad et al.35.


Statistical Analysis
Table (1) showed the bone parameters in different groups along the experiment days. Bone length was significantly increased in G7 (Zingiber officinale) and G8 (Nigella Sativa) versus G6 (diabetic control) but was significantly decreased in G9 (Punica granatum) versus G7. Bone thickness was significantly increased in G7, G8, G9 and G10 (Metformin) versus G6 and increased in G9 and G10 versus G7 and G8. Bone volume was significantly increased in G8 versus G6.

Table (1):
Comparison of the Bone Parameters in different studied groups at different days.

Bone length (mm)
Bone thickness (mm)
Bone weight


Bone volume(ml)
Bone density (g/ml)
G6 (STZ (Diabetic control)
G7 (STZ + Zing off 100 mg in Diabetic rats)
G8 (STZ + Nigella (80mg) in Diabetic rats)
1P=0.043; 2P=0.880
1P=0.014; 2P=0.780
1P=0.458; 2P=0.093
1P=0.037; 2P=0.180
1P=0.380; 2P=0.068
G9 (STZ + Punica (400 mg) in Diabetic rats)
1P=0.922; 2P=0.039; 3P=0.053
1P=0.001;2P=0.001; 3P=0.001
1P=0.597; 2P=0.139; 3P=0.829
1P=0.110; 2P=0.415; 3P=0.586
1P=0.588; 2P=0.130; 3P=0.732
G10 (STZ + metformin 150 mg)
1P=0.426; 2P=0.153; 3P=0.199; 4P=0.484
1P=0.001; 2P=0.001; 3P=0.001; 4P=0.412
1P=0.506; 2P=0.108; 3P=0.937; 4P=0.891
1P=0.110; 2P=0.415; 3P=0.586; 4P=1.000
1P=0.941; 2P=0.234; 3P=0.496; 4P=0.732

Data are expressed as mean +/- standard error. 1P: significance versus G6; 2P: significance versus G7; 3P: significance versus G8; 4P: significance versus G9; using OneWay ANOVA test (LSD).

Comparison of all bone length, thickness, weight, volume, anddensityin different studied groups, are shown in Figures (1), (2), (3), (4), and (5).

Fig. 1. Comparison of the bone length (mm) in different studied groups.

Fig. 2. Comparison of the bone thickness (mm) in different studied groups.

Fig. 3. Comparison of the bone weight (gram) in different studied groups.

Fig. 4. Comparison of the bone volume (ml) in different studied groups.

Fig. 5. Comparison of the bone density (gram/ml) in different studied groups.

Histopathology of Bone
All the Decalcified bone tissue of study groups shows normal lamellar bone morphology arranged in regular parallel arrays. Osteocytes are seen within small lacunae having a dark nucleus with normal appearance Figures (6), (7), (8), (9), and (10).

Fig. 6.Histopathology of decalcified bone of group 6 (Diabetic control).

Fig. 7.Histopathology of decalcified bone of group 7 (Ginger in diab.Group).

Fig. 8. Histopathology of decalcified bone of group 8 (Nigella in diab.Group).

Fig. 9. Histopathology of decalcified bone of group 9 (Punica in Diab.).

Fig. 10. Histopathology of decalcified bone of group 10 (Metformin in Diab. group).

Culture Observation
After bone swab culture, no bacterial growth was observed in all the studied groups.


The different substances studied in this study have been well documented for their wide variety of actions. Metformin reduces insulin resistance have been known to possess more than one mechanism of action. Ginger and Nigella Sativa also are known to possess various therapeutic effects, including a reduction in serum glucose, anti-inflammatory, antioxidant and antimicrobial, etc. In previous studies, these substances have been found effective in preventing diabetes induced complication, preventing the cell damage. Punica granatum have also been studied and is known to be rich in antioxidants which reduce oxidative stress. Reduction in oxidative stress is directly proportional to reduction in free radical formation and the prevention of cellular damage8,24,36,37.

In the present study, no bacterial growth was seen in the bones, in all the studied groups, at the same time in Metformin, Ginger, and Nigella sativa groups, a significant increase was found in bone length, volume and thickness.

All the substances studied, also have shown significant reduction in hyperglycemia.

In comparison to previous studies, the results of our study regarding Metformin protective effect on diabetes induced bone degradation, tally with the study conducted by38.

As Metformin reduced blood glucose levels, which behave as good culture media for bacterial growth, reductions that medium resulted in no growth of microorganisms which is a common phenomena seen in diabetes, indirectly reducing the risk for infections.

Streptozotocin-induced diabetic animals also show many of the complications seen inhuman diabetic patients, including enhanced susceptibility to infection and cardiovascular disease, retinopathy, changes in angiogenesis, delayed wound healing, diminished growth factor expression, and reduced bone synthesis39,40.

The relationship between diabetes and osteoporosis is complex.

These days osteoporosis is considered as a main outcome of Diabetes mellitus. DM can affect bone via several mechanisms like insulin deficiency, insulin resistance, hyperglycemia and atherosclerosis. However, the exact cause that is responsible for osteopenia in DM is yet to be known41. Insulin and insulin-like growth factors (IGF-1) may have some function to play in the pathogenesis of diabetic-induced bone loss due to their anabolic effects42.

The results of this study regarding Nigella Sativa, preventing the bone degradation are in conformity with the previous studies43,44. The current study results show that Nigella Sativa also increased the bone mass, strength, matrix, volume and length. This can be attributed to its being rich in antioxidants thereby causing a decrease in oxidative stress. Regarding prevention of infection in this study, it is well documented for the Nigella Sativa that it contains anti-bacterial, anti-viral and antifungal effects45,46,47.

In present study, Ginger i.e. Zingiber officinale, also was found to protect the bone from Diabetes induced damage and it has not merely protected the bone from damage and infections, but also increased the bone mass, density, volume and strength as well48.

Antibacterial effects of Ginger are well known, therefore, the prevention of infections can be attributed to this effect while having anti-inflammatory, anti-oxidant effects can hold responsible for increase in bone mass, volume, density and strength49. Results of our study are matching with the previously conducted studies50.

In current study, Punica granatum (Pomegranate) was also observed to prevent the Diabetes induced bone damage at the same time it also caused increases in Bone mass, density, volume and strength. All of these effects pertain to pomegranates being rich in antioxidants and the consequent prevention of free radical formation and reduction in oxidative stress. These results are found similar to the previous studies4,52.


Diabetes mellitus is notorious to cause complications in all the systems, including musculoskeletal system, leading to early occurrence of osteoporosis. Hyperglycemia due to decrease or dysfunctional Insulin works as a medium for bacterial growth. Osteomyelitis, an infection of bone is very difficult to treat. The best approach to counter the DM related complications is to prevent these.

The substances used in this study, directly (Nigella sativa and Ginger has anti-hyper glycemic effects and antibacterial activity) and indirectly (Punica granatum and Metformin causes decrease in blood glucose levels), prevented the infections.

At the same time all the studied groups having effects on oxidative stress (Punica-granatum and Metformin) and possessing anti-inflammatory effects as well (Nigella sativa and Ginger), not merely prevented the bone damage but also caused increases in bone volume, strength, matrix, length and density.

It is suggested that further investigations should be conducted for verification of the results of this study with different methodology and longer duration of study. However it is recommended that these substances should be considered as adjuvant therapy in the treatment of Diabetes mellitus and prevention of DM related infections and bone damage.



Conflict of Interest

The authors declare no conflict of interest.

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