INDUCED COAGULATION AS A COMPLICATION OF INFLAMMATORY REACTIONS IN MICE TREATED WITH MONOSODIUM GLUTAMATE
HTML Full TextINDUCED COAGULATION AS A COMPLICATION OF INFLAMMATORY REACTIONS IN MICE TREATED WITH MONOSODIUM GLUTAMATE
Gehan M. Badr * 1, 2 and Abdulmohsen I. Algefare 1
Department of Biological Sciences 1, Faculty of Science, King Faisal University, Kingdom of Saudi Arabia.
Department of Zoology 2, Faculty of Science, Ain Shams University, Egypt.
ABSTRACT: Monosodium glutamate (MSG) is a familiar food additive processed to enhance the taste. This work was carried out to investigate the effect of MSG on platelets profile and indices of thrombus formation together with the detection of some plasma inflammatory markers. The study used adult male mice divided into five groups: a control group and four groups treated with different doses of MSG (2, 4, 8 and 16 mg/kg, respectively for 30 days, orally). The mice treated with 8 and 16 mg/kg of MSG resulted in significant high levels of plasma inflammatory markers such as tumor necrosis factor-α (TNF-α), interleukin-6 (IL-6) and C-reactive protein (CRP). Also, thrombocytosis, significant increase in fibrinogen (FIG) concentration, low values of prothrombin time (PT) and the associated international normalized ratio (INR) compared to the control group. Our study suggests that MSG initiates inflammatory reactions, which may induce thrombocytosis and coagulation complication in mice model.
Keywords: |
Monosodium glutamate, Inflammation, Coagulation complication, Mice
INTRODUCTION: Nowadays, monosodium glutamate (MSG) is one of the world’s most widely flavor enhancer. When it is added to food in relatively small quantities, the palatability of this food increases 1, 2. Although MSG consumption is believed to be safe, The Joint FAO/WHO Expert Committee on Food Additives (JECFA) did not specify the acceptable daily intake for glutamic acid and its salts 3. The current work targeted the assessment of the risk of oral administration of MSG on coagulation hemostasis along with inflammatory response in mice model.
Several empirical studies correlate long consumption of MSG with a series of unwanted symptoms. Moreover, it caused some toxic effects and increased the oxidative stress in liver, heart and erythrocytes, kidney and nervous system 1, 4, 5, 6. Also, the oral ingestion of MSG to rats or mice results in a condition of inflammatory blood vessels, oxidative stress in many tissues, referred to hyperlipidemia, hypolipoproteinemia, and hyperglycemia and causes the condition of atherosclerosis 6, 7, 8, 9. Thrombocytosis has been associated with the risk of thrombotic and hemorrhagic events.
Findings among patients with mild thrombocytosis suggested that high normal platelet count is associated with the occurrence of thrombotic events 10. Thrombocytosis may be a reactive process (secondary thrombocytosis), which is a secondary to a variety of acute and chronic clinical conditions including acute infection or inflammation, response to exercise and acute blood loss 11, 12. MSG has a significant increase in the number of platelets; thrombocytosis, bleeding time and clotting time in rats 13. The Effect of MSG showed cessation of bleeding and accelerate the thick fibrin formation at wound tissue of rat-tail. Also, MSG shortens thrombin time and prolongs euglobulin lysis times which signify antifibrinolytic effects; it was reported to stop bleeding and constrict blood vessels by administration locally 14, 15.
MATERIAL AND METHODS:
Animals: The present study use (60) adult male albino mice, weighing (50±5 g). Animals housed in environmentally controlled conditions (temperature of 22±2 ºC) with a 12 h light/dark cycle and had free access to commercial rodent pellets and water ad libitum. The Experimental Animal Ethics by the National Institutes of Health Guide for Care and Use of Laboratory Animals (NIH Publication No. 85-23, revised 1996).
Experimental Design: Mice divided into 5 groups (n= 12) as follows: First control group (mice treated with oral distilled water). Second to fifth treated groups (mice treated with oral doses of MSG (2 mg/kg b wt.); MSG (4 mg/kg b wt.); MSG (8 mg/kg b wt.) and MSG (16 mg/kg b wt.), respectively. All treatments for 30 consecutive days.
Chemicals: Monosodium glutamate (L-Glutamic acid monosodium salt). Empirical Formula C5H8NNaO4. × H2O. The salt of the current study purchased from local markets in Saudi Arabia called Aji-no moto.
ELISA Cytokines: Estimation of plasma TNF-α (Cat. no. 88-7324-22), the sensitivity of TNF-α was 8 pg/ml; plasma IL-6 (Cat. no. EM2IL6) were calculated from standard curves, the sensitivity of IL-6 was 7 pg/ml and plasma CRP (Cat. no. EPX01A-26045-901). All the mouse ELISA kits used according to the manufacturer’s instructions; Thermo Fisher Scientific Company.
Platelets Profile: Platelets counts, MPV, PDW, and PCT profiles obtained, as a part of complete blood count profiles according to the manufacturer’s instructions by using automated hematology analyzer (SysmaxKX 21, Germany) is a double capillary instrument. Samples were analyzed.
Coagulation Profile: 200 µl of blood was collected into a citrated (blue-top) tube containing (3.2% sodium citrate) to measure PT and INR by using a coagulation analyzer through the conventional procedures used for human blood coagulation analysis 16. Quantitative estimation of plasma fibrinogen antigen by total ELISA kit Catalog no. IMFBGNKT, Innovate Research Company.
Statistical Analysis: Reported values represent mean ± SE. The statistical analysis evaluated by one-way ANOVA. Once a significant F test obtained, LSD comparisons performed to assess the significance of differences among various treatment groups. Statistical Processor System Support "SPSS" for Windows software, Release 21.0 (SPSS, Chicago, IL) was used.
RESULTS AND DISCUSSION: Recently, several empirical studies reported that inflammation and coagulation complications are intricately linked, which significantly associated with morbidity and mortality. The current new approach may be a link between the MSG-induced inflammatory response and the development of coagulation complications in mice models.
TABLE 1: EFFECT OF MSG TREATMENTS ON PRO-INFLAMMATORY CYTOKINES
Groups / Parameter | Control | 2 MSG | 4 MSG | 8 MSG | 16 MSG |
TNF-alpha (Pg/ml) | 245.0 ± 0.62 | 287.00 ± 0.86* | 309.42 ± 0.79*a | 440.38 ± 2.84*ab | 631.93 ± 2.60*abc |
CRP (Pg/ml) | 2.07 ± 0.00 | 2.09 ± 0.01* | 3.01 ± 0.04*a | 5.41 ± 0.03*ab | 8.36 ± 0.03*abc |
IL-6 (Pg/ml) | 412.92 ± 1.39 | 414.94 ± 0.68* | 563.59 ± 0.99*a | 656.35 ± 7.02*ab | 944.33 ± 5.02*abc |
Data expressed as Mean ± SE. (n=12). One Way analysis performed between groups with LSD post hoc test with significance level 0.05. Significant indicated by an asterisk (*) as compared to control, (a) as compared to 2 MSG group, (b) as compared to 4 MSG group, (c) as compared 8 MSG group
Data in Table 1 presented a significant increase in the proinflammatory cytokines (CRP and TNF) as well as interleukin-6 (IL-6) in all treated groups as compared to control group. 8 and 16 MSG results showed a significant increase in the pro-inflammatory cytokines values as compared to all groups corresponding values. Results of 16 MSG group recorded a significant increase in the measured cytokines and interleukin-6 values as compared to the corresponding values 8 MSG group. As well as 4 MSG showed a significant increase in data as compared to 2 MSG value.
A significant increase in plasma TNF, IL-6, and CRP in mice treated with 8 and 16 mg/kg of MSG confirming the inflammatory effects of MSG which in line with previous studies 8, 9. On the other hand, 2 and 4 mg/kg doses didn’t affect significantly these cytokines. As the increasing level of plasma TNF-α, is the best pro-inflammatory cytokine released at the site of inflammation, also, TNF-α promotes a procoagulant state by inhibiting synthesis of the anticoagulant protein and stimulating thrombin and fibrin formation. IL-6 has linked to the activation of coagulation in mice model. Also, a high level of plasma IL-6 increase the transcription of procoagulant proteins or decrease the transcription of anticoagulant proteins. CRP; the transcriptional target of IL-6 is linked to ischemic cardiovascular complications 17, 18, 19. Inflammation stimulates the unbalance between pro and anticoagulant properties of endothelium, increases the fiber density and resists the fibrinolysis in patients with acute coronary syndromes 20.
During inflammation, platelets release micro-particles containing tissue factor for a localized induction of the coagulation cascade 21. Several animal studies revealed those inflammatory diseases such as inflammatory bowel disease (IBD) associated with elevated TNF-α, IL-6 and IL-1beta; the pro-inflammatory cytokines that enhanced thrombus development 22.
TABLE 2: EFFECT OF MSG TREATMENTS ON PLATELETS PROFILE
Groups / Parameter | Control | 2MSG | 4 MSG | 8 MSG | 16 MSG |
Platelets count 103/µL | 508.40 ± 3.25 | 512.20 ± 3.86 | 518.50 ± 6.51 | 1139.00 ± 11.12*ab | 1623.40 ± 9.31* abc |
MPV (fl) | 6.56 ± 0.02 | 6.66 ± 0.04 | 6.59 ±0.06 | 7.76 ± 0.05*ab | 7.72 ± 0.14*ab |
PDW (fl) | 8.14 ± 0.03 | 8.21 ± 0.01 | 8.21 ± 0.03 | 8.30 ± 0.03*ab | 8.40 ± 0.03*abc |
PCT % | 6.55 ± 0.02 | 6.54 ± 0.02 | 6.52 ± 0.04 | 13.1 ± 0.16 *ab | 16.6 ± 0.07 *abc |
Data expressed as Mean ± SE. (n=12). One Way analysis performed between groups with LSD post hoc test with significance level 0.05. Significant indicated by an asterisk (*) as compared to control, (a) as compared to 2 MSG group, (b) as compared to 4 MSG group, (c) as compared 8 MSG group.
Platelets profiles have a central role in the process of inflammation; they are correlated with the activation of the coagulation system during inflammatory reactions and thrombotic diseases 23. Data in Table 2 showed a significant increase in platelets count, MPV, PDW and PCT% in groups treated with MSG at doses 8 and 16 mg/kg b. wt for 30 consecutive days as compared to control values and other treated groups. The data showed a significant increase in platelets count, PDW and PCT% in 16 MSG group as compared to 8 MSG group while recorded not statistically differences in MPV. Meanwhile, mice were treated with 2, and 4 mg/kg showed healthy compared to the control group in all the previous parameters. These data agree with Ajibola et al., 13 platelets, MPV, PDW, and PCT have been shown to have diagnostic value in certain inflammatory diseases, such as inflammatory bowel diseases, atherosclerosis 24, 25. On the other hand, Lin et al. reported that MPV is a predictive indicator in patients with portal vein thrombosis 26. The present data in mice treated with oral 8 and 16 mg/kg showed the type of thrombocytosis that is in agreement with previous studies of secondary thrombocytosis in the setting of systemic disorders due to inflammation or acute blood 27, 28, 29.
Moreover, thrombocytosis may be related to increasing levels of circulating cytokines, in particular, interleukin IL 6; the proinflammatory cytokine is known to regulate promote megakaryocytopoiesis in-vitro and raises platelet counts in-vivo 30. In hemostasis, platelet production is tightly regulated by the hormone thrombopoietin (TPO), which regulates nearly all stages of the megakaryocytopoiesis and this explains that alteration in megakaryocytes and platelets production leading to thrombocytopenia or thrombocytosis 31, 32. Increasing the level of interleukin-6 induce the expression of TPO in hepatocytes. TPO mainly regulates the homeostatic production of platelets and the TPO receptor (MPL)/JAK2 axis 33. 32. The present data agreed with Chu et al., 34 who reported that MPV is associated with high-grade inflammation owing to the presence of the large platelets in circulation. In addition, MPV is found to be associated with cytokines (thrombopoietin, interleukin-6, and interleukin-3) that regulate the production of larger platelets and promote megakaryocyte production 19. Our results showed a significant increase in PDW and PCT in groups 8 and 16 mg/kg compared to control group; the results are in line with the previous reports, which resulted that MPV and PDW usually affected in the same direction 35. On the other hand, conflicting results showed there is no direct relationship between MPV and PDW 36, 37. The current results demonstrated a high percentage of PCT; the volume occupied by platelets in the blood.
TABLE 3: EFFECT OF MSG TREATMENTS ON COAGULATION PROFILE
Groups / Parameter | Control | 2MSG | 4 MSG | 8MSG | 16 MSG |
Fibrinogen (ng/ml) | 250.38 ± 0.03 | 264.04 ± 1.9* | 266.48 ± 1.63* | 351.17 ± 3.54*ab | 523.59 ± 4.80*abc |
PT (sec) | 8.31 ± 0.04 | 8.28 ± 0.07 | 8.38 ± 0.13 | 5.36 ± 0.16*ab | 3.25 ± 0.45*abc |
INR | 0.91 ± 0.00 | 0.92 ± 0.00 | 0.91 ± 0.01 | 0.69 ± 0.01*ab | 0.38 ± 0.02*abc |
Data expressed as Mean ± SE. (n=12). One Way analysis performed between groups with LSD post hoc test with significance level 0.05. Significant indicated by an asterisk (*) as compared to control, (a) as compared to 2 MSG group, (b) as compared to 4 MSG group, (c) as compared 8 MSG group.
The marker for the extrinsic coagulation pathway measured by calculating the prothrombin ratio along with the international normalized ratio. Data in Table 3 showed a significant increase in fibrinogen concentration in all treated groups as compared to control value. While revealed a significant decrease in PT and associated INR in 16 MSG group as well as 8 MSG group as compared to control and all other treated groups. The results of our study showed the onset of thrombosis in mice treated with 8 or 16 mg/kg MSG through significant elevating in fibrinogen concentration and the decrease the PT and associated INR. Fibrinogen (factor I) is an acute-phase protein that it may be elevated during tissue and vascular inflammation. Fibrinogen is the substrate of thrombin which converted it to fibrin in the coagulation cascade provides the fibrin-based blood clot 38, 39. Elevation fibrinogen concentration discussed previously as fibrinogen released from mega-karyocytes and linked to inflammation 40. Also, elevated plasma fibrinogen is indicator factor for thromboembolism or atherosclerosis 41.
CONCLUSION: The risk for thrombus formation at high doses of MSG (8 and 16 mg/kg) in mice model may be correlated with inflammation, thus it needs more research to be done to be fully investigated.
ACKNOWLEDGEMENT: The authors gratefully acknowledge the Deanship of the Scientific Research, King Faisal University, Saudi Arabia.
CONFLICT OF INTEREST: The authors declared no conflicts of interest.
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How to cite this article:
Badr GM and Algefare AI: Induced coagulation as a complication of inflammatory reactions in mice treated with monosodium glutamate. Int J Pharm Sci & Res 2019; 10(3): 1121-25. doi: 10.13040/IJPSR.0975-8232.10(3).1121-25.
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Article Information
18
1133-1137
571
961
English
IJPSR
G. M. Badr * and A. I. Algefare
Department of Biological Sciences, Faculty of Science, King Faisal University, Kingdom of Saudi Arabia.
gmahmoud@kfu.edu.sa
02 July 2018
20 September 2018
22 September 2018
10.13040/IJPSR.0975-8232.10(3).1121-25
01 March 2019