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Journal of Obesity & Weight Loss Therapy
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Long-Term Effects of Ipragliflozin on Adipose Tissue in Japanese Patients with Obese Type 2 Diabetes

Nishio SI1,2*, Sekido T1, Ohkubo Y1,2, Takahashi T3, Oiwa A1, Kaneko A1 and Komatsu M1

1Division of Diabetes, Endocrinology and Metabolism, Department of Internal Medicine, Shinshu University School of Medicine, Matsumoto, Japan

2Research Center for Next Generation Medicine, Shinshu University School of Medicine, Matsumoto 390-8621, Japan

3Shinshu University Hospital, Department of Nursing, Matsumoto 390-8621, Japan

Corresponding Author:
Shin-ichi Nishio, M.D, Ph.D
Division of Diabetes, Endocrinology and Metabolism
Department of Internal Medicine, Shinshu University School of Medicine
3-1-1 Asahi, Matsumoto, 390-8621 Japan
Tel: +81-263-37-2686
E-mail: [email protected]

Received Date: August 04, 2017; Accepted Date: August 11, 2017; Published Date: August 18, 2017

Citation: Nishio SI, Sekido T, Ohkubo Y, Takahashi T, Oiwa A, et al. (2017) Long-Term Effects of Ipragliflozin on Adipose Tissue in Japanese Patients with Obese Type 2 Diabetes. J Obes Weight Loss Ther 7:345. doi:10.4172/2165-7904.1000345

Copyright: © 2017 Nishio SI, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

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Abstract

A long-term effect of ipragliflozin on adipose tissue mass reduction by ipragliflozin in Japanese patients with obese type2 diabetes (mean BMI 35.1 ± 1.1 kg/m2) was investigated. 17 of 20 participants completed this study. Ipragliflozin was administered (50 mg/day) once daily for 12 months. At 0, 3, 6 and 12 months, visceral and subcutaneous adipose tissue area was determined by two different bioelectrical impedance methods, and blood samples for HbA1c, renal function, lipids and liver function obtained, and body weight and blood pressure recorded. The primary endpoint was decrease in body fat mass. Secondary endpoints included changes in body weight and the laboratory data. Visceral fat area (cm2, mean ± SD) at 0, 3, 6 and 12 months was 166.0 ± 49.7, 149.7 ± 46.1, 149.7 ± 42.4 and 148.5 ± 40.2, respectively: the value at 3 months was significantly lower than baseline (P=0.027). Subcutaneous fat at the corresponding time points was 359.3 ± 110.5, 316.6± 87.1, 326.8 ± 87.2 and 325.9 ± 90.4, respectively: the values at each post treatment period were significantly less than the baseline (P=0.003, 0.018 and 0.036 for the three points, respectively). Body weight was significantly reduced by 12 months (P=0.045). Serum alanine aminotransferase, aspartate aminotransferase, and γ-glutamyl transpeptidase levels decreased significantly. There was no significant correlation between serum hepatobiliary enzyme levels and γ-body weight or visceral fat. But γ-GTP was correlated with subcutaneous fat (Spearman’s P=0.004). During 1 year-interval, ipragliflozin significantly reduced subcutaneous adipose tissue and serum hepatobiliary enzyme levels, and may be useful in patients with obese diabetes.

Keywords

SGLT2 inhibitor; Ipragliflozin; Visceral fat; γ-glutamyl transpeptidase; Subcutaneous fat

Introduction

Body fat reduction by sodium-glucose co-transporter 2 (SGLT2) inhibitors has been observed for up to 1 year in Caucasian patients [1]. In Japanese patients, SGLT2 inhibitor-associated body fat reduction has been examined only in short-term (≤6 months) studies [2]. Therefore, we investigated long-term effects of SGLT2 inhibitor on body fat and liver function in Japanese patients with obese type2 diabetes (T2D). Obesity rates are increasing worldwide, with elevated risk of T2D, high blood pressure, dyslipidemia, and cardiovascular disease. In Japan, the mean body mass indexes (BMI) of men and elderly women are increasing [3], and obesity is becoming a major public health problem. No drugs for treating obesity were available until recently in Japan. The SGLT2 inhibitor, ipragliflozin (Astellas Pharma, Tokyo, Japan and Kotobuki Pharmaceutical, Nagano, Japan), a drug approved for T2D treatment in Japan, was reported to induce weight loss [4,5]. SGLT2 inhibitors improve glycemia in T2D patients by enhancing urinary glucose excretion via blocking its reabsorption in the renal proximal tubules and reduce body weight due to urinary calorie loss [6,7]. Therefore, they may have an anti-obesity effect. The observed body weight decrease may be attributed to visceral adipose tissue lipolysis and enhanced lipid metabolism [8]. Ipragliflozin reduced body fat in rats [9], and clinical reports indicated visceral fat reduction by ipragliflozin in Asian people. Ipragliflozin significantly decreased visceral adipose tissue in 4-week observation in 25 Japanese T2D patients [10]. Visceral fat area was significantly reduced in 6- month observation of 64 diabetic patients [2]. However, obesity is difficult to treat as many subjects regain weight after temporary weight loss [11-15]. Any study on body weights, the longer, the better. Nonetheless, there have been no long-term (12-month) surveys of SGLT2 inhibitors in obese T2D patients in Japan. Here, we examined long-term effects of ipragliflozin in obese T2D patients and evaluated the influence of ipragliflozin on liver function by monitoring changes in serum hepatobiliary enzyme levels.

Materials and Methods

The study population consisted of 20 patients with obese T2D presenting to Shinshu University Hospital outpatient clinic due to obesity between August 2015 and January 2017. Inclusion criteria were age 20-65 years old, HbA1c > 6.2%, BMI > 25 kg/m2, and estimated glomerular filtration rate (eGFR) > 60 mL/min/1.73 m2 (Table 1). Subjects with unstable diabetic retinopathy, serious hepatic dysfunction, renal failure, heart complications, and pregnancy were excluded. In Japan, BMI≥25 kg/m2 and ≥35 kg/m2 are defined as obesity and severe obesity, respectively. Participants average BMI (± SD) was 35.1 ± 1.1 kg/m2 and 13 patients were severely obese. Diet therapy, exercise therapy, and/or treatment with any anti-diabetic drugs other than SGLT2 inhibitors were continued (Table 2). No changes in anti-diabetic drug regimens were allowed during the observation period unless deemed necessary to prevent hypo/ hyperglycemia. Oral ipragliflozin administration (50 mg once daily) was continued for 12 months in 17 cases. The following variables were monitored before and at 3, 6, and 12 months after commencement of ipragliflozin treatment: HbA1c, body weight, BMI, estimated visceral fat area, estimated subcutaneous fat area, systolic blood pressure, diastolic blood pressure, serum aspartate aminotransferase (AST), alanine aminotransferase (ALT), γ-glutamyl transpeptidase (γ-GTP), blood urea nitrogen, creatinine, uric acid, glomerular filtration rate (eGFR), and serum levels of low-density lipoprotein cholesterol (LDLC), high-density lipoprotein cholesterol (HDL-C), and triglyceride (TG). Patients received diet and nutritional guidance before and at least once after initiation of ipragliflozin treatment. This study conformed to the Declaration of Helsinki, received approval from our university ethics committee (Study no. 3049), and subjects provided written informed consent before participation.

Age (year) 47.1 ± 2.5
Sex (male/female) 10-Oct
Duration (year) 9.8 ± 1.6
Body weight (kg) 97.6 ± 15.2
BMI (kg/m2) 35.1 ± 1.1
Blood pressure (mmHg) 134 ± 14/85 ± 11
VAT (cm2) 166.0 ± 49.7
SAT (cm2) 359.3 ± 110.5
HbA1c (%) 7.7 ± 1.3

Table 1: Participant characteristics. The values are expressed as means ± SD. BMI, Body Mass Index; VAT, Visceral Adipose Tissue; SAT, Subcutaneous Adipose Tissue; HbA1c, Glycated Hemoglobin.

BG 16 cases (80%)
SU  8 cases (40%)
Pioglitazone  4 cases (20%)
DPP-4 inhibitors 10 cases (50%)
Glinides  1 case (5%)
α-Glucosidase inhibitors  3 cases (15%)
Insulin  7 cases (35%)
GLP-1R agonists  3 cases (15%)
No concomitant drugs  2 cases (10%)

Table 2: Anti-diabetic drugs other than SGLT2 inhibitors used in combination. BG, Biguanide, SU, Sulfonylurea, DPP-4, Dipeptidyl Peptidase-4; GLP-1R, Glucagon-like Peptide-1 receptor.

The primary endpoint was change in adipose tissue measured by two different bioelectrical impedance methods with a Dual Scan (HDS 2000, Omron, and Kyoto, Japan). Secondary endpoints included changes in body weight, HbA1c, blood pressure, liver and renal function and lipid profile.

Statistical Analysis

Data were analyzed by paired t test. Microsoft Excel 2013 and SPSS ver. 22.0 for Windows (IBM Japan, Tokyo, Japan) were used for statistical analyses. All P-values for comparison before and after administration were subjected to Bonferroni adjustment. Relationships between changes in adipose tissue and hepatobiliary enzymes were assessed using Spearman’s rank correlation coefficients. In all analyses P < 0.05 was taken to indicate statistical significance.

Results

Twenty T2D patients were enrolled in this study. Three subjects dropped out: one failed to be evaluated for urinary tract infections, and the other two discontinued ipragliflozin due to development of eruptions within 1 week after administration. Seventeen subjects completed the full protocol and were included in statistical analyses. Table 3 shows changes in test items every 3 months during ipragliflozin treatment.

    Before   Month 3 P- value   Month 6 P-value   Month 12 P-value
  n (M0) n   (M0 vs M3) n   (M0 vs M6) n   (M0 vs M12)
BW (kg) 17 97.6 ± 15.2 17 94.1 ± 14.1 0.006 17 93.4 ± 14.1 0.003 17 93.8 ± 13.4 0.045
Visceral fat area (cm2) 17 166.0 ± 49.7 16 149.7 ± 46.1 0.027 14 149.7 ± 42.4 0.121 17 148.5 ± 40.2 0.19
Subcutaneous fat are (cm2) 17 359.3 ± 110.5 16 316.6 ± 87.1 0.003 14 326.8 ± 87.2 0.018 17 325.9 ± 90.4 0.036
Systolic blood pressure (mmHg) 17 134 ± 14 16 132 ± 12 0.672 16 131 ± 17 >0.999 17 132 ± 16 >0.999
Diastolic blood pressure (mmHg) 17 85 ± 11 16 82 ± 14 >0.999 16 80 ± 14 0.867 17 81 ± 9 0.498
HbA1c (%) 17 7.7 ± 1.3 17 7.1 ± 1.1 0.099 17 7.2 ± 1.2 0.03 17 7.2 ± 1.3 0.387
AST (IU/L) 17 36 ± 20 15 29 ± 14 0.021 15 23 ± 8 0.003 17 23 ± 8 0.015
ALT (IU/L) 17 53 ± 33 15 38 ± 23 0.024 15 28 ± 11 0.006 17 29 ± 16 0.015
γGTP (IU/L) 17 61 ± 46 15 46 ± 30 0.047 15 40 ± 25 0.021 17 39 ± 26 0.043
BUN (mg/dL) 17 15.1 ± 3.5 16 16 ± 4.0 0.516 16 17.4 ± 4.1 0.054 17 17.3 ± 5.6 0.231
Cr (mg/dL) 17 0.78 ± 0.13 16 0.79 ± 0.14 >0.999 16 0.77 ± 0.13 >0.999 17 0.80 ± 0.14 0.834
eGFR (mL/min/1.73 m2) 17 77 ± 18 16 76 ± 18 >0.999 16 77 ± 20 >0.999 17 77 ± 19 >0.999
UA (mg/dL) 17 6.4 ± 0.1.4 15 5.7 ± 1.4 0.396 13 5.1 ± 1.1 0.03 16 5.5 ± 1.4 0.165
HDL-C (mg/dL) 17 43 ± 8.7 15 47 ± 10 0.708 15 49 ± 13 0.018 13 50 ± 13 0.456
LDL-C (mg/dL) 17 111 ± 23 15 107 ± 25 0.662 14 105 ± 24 >0.999 13 107 ± 26 >0.999
TG (mg/dL) 17 258 ± 200 16 239 ± 185 0.538 15 211 ± 148 0.294 13 185 ± 123 0.078

Table 3: Changes in various items every 3 months with administration of ipragliflozin. The values are expressed as means ± SD. BMI: Body Mass Index; HbA1c: Glycated Hemoglobin; AST: Aspartate Aminotransferase; ALT: Alanine Aminotransferase, γ-GTP: γ-Glutamyl Transferase, BUN: blood urea nitrogen; Cr: Creatinine; eGFR: Estimated Glomerular Filtration rate; UA: Uric Acid, LDL-C: Low-Density Lipoprotein Cholesterol, HDL-C: High-Density Lipoprotein Cholesterol, TG: Triglyceride.

Estimated mean subcutaneous adipose tissue (± SD) decreased significantly from 359.3 (± 110.5) cm2 to 316.6 (± 87.1) cm2 at 3 months (P=0.003), 326.8 (± 87.2) cm2 at 6 months (P=0.018), and 325.9 (± 90.4) cm2 at 12 months (P=0.036) (Figure 1). Mean visceral adipose tissue (± SD) decreased at 3 months (166.0 (± 49.7) cm2 to 149.7 (± 46.1) cm2; P=0.027), but after 6 months there was no significant difference (Figure 2). Mean body weight decreased over the observation period (Figure 3), with a significant decrease at 12 months (97.8 (± 15.9) kg to 93.8 (± 13.4) kg, P=0.045).

obesity-weight-loss-therapy-body-weight

Figure 1: Changes in body weight. The data show the mean values of body weight at 0, 3, 6, and 12 months (thin gray lines indicate individual data). P-values: 0 vs. 1 months, 0 vs. 3 months, 0 vs. 6 months, and 0 vs. 12 months (Bonferroni adgustment (n=17).

obesity-weight-loss-therapy-visceral-adipose-tissue

Figure 2: Changes in visceral adipose tissue. The data show the mean values of visceral adipose tissue at 0, 3, 6, and 12 months (thin gray lines indicate individual data). P-values: 0 vs 3 months, 0 vs. 6 months, and 0 vs. 12 months (Bonferroni adgustment) (n=17). N.S: Not significant.

obesity-weight-loss-therapy-subcutaneous

Figure 3: Changes in subcutaneous adipose tissue. The data show the mean values of subcutaneous adipose tissue at 0, 3, 6, and 12 months (thin gray lines indicate individual data). P-values: 0 vs. 3 months, 0 vs 6 months, and 0 vs 12 months (Bonferroni adgustment) (n=17).

Systolic and diastolic blood pressures tended to decrease during the treatment period (not significant).

Mean HbA1c (± SD) level improved, and decreased significantly from 7.7% (± 1.3) % at baseline to 7.2% (± 1.2) % at 6 months (P=0.032); there was no significant difference at 12 months (Table 3). Blood urea nitrogen and creatinine showed no significant changes (Table 3). Mean uric acid (± SD) level decreased significantly from 6.4 (± 4.0) mg/dL at baseline to 5.1 ± (1.1) mg/dL at 6 months (P=0.030); however, there was no significant difference at 12 months. eGFR remained unchanged during the 12 months of treatment, it tended to increase during the treatment period, but the differences were not statistically significant. AST, ALT, and γ-GTP levels at the end of treatment were significantly decreased compared to baseline (Figure 4). Serum LDL-C and TG levels tended to decrease, while serum HDLC tended to increase, but the differences were not significant. There were no correlations between changes in ALT or AST levels and those in visceral adipose tissue (Figure 5A, 5B) and subcutaneous adipose tissue (Figure 5D, 5E). Change in γ-GTP levels was not related to those in visceral adipose tissue (Figure 5C), but correlated with change in subcutaneous adipose tissue volume (Spearman’s=0.664, P=0.004) (Figure 5F).

obesity-weight-loss-therapy-Bonferroni-adjustment

Figure 4: Change in ALT, AST, and γ-GTP. P-values: 0 vs. 3 months (n=15), 0 vs. 6 months (n=15), and 0 vs. 12 months (n=17) (Bonferroni adjustment).

obesity-weight-loss-therapy-serum-ALT

Figure 5: A) Correlation between changes in serum ALT levels and visceral adipose tissue (n=17). B) Correlation between changes in serum AST levels and the visceral adipose tissue (n=17). C) Correlation between changes in serum γ-GTP levels and the visceral adipose tissue (n=17). D) Correlation between changes in serum ALT levels and subcutaneous adipose tissue (n=17). E) Correlation between changes in serum AST levels and subcutaneous adipose tissue (n=17). F) Correlation with change in subcutaneous adipose tissue volume.

Discussion

Long-term studies of the effects of SGLT 2 inhibitor on body weight and body fat loss have been reported in Caucasians [1,16], but there have been no such studies in Japan. We clearly demonstrated longterm body fat reduction by SGLT2 inhibitor (ipragliflozin) treatment in Japanese T2D patients. Ipragliflozin reduced body weight in Japanese patients with obese T2D (average BMI ≥ 30 kg/m2), with no rebound as long as regular dietary guidance continued and lasted for > 1 year. Ipragliflozin reduced both visceral and subcutaneous fat up to 3 months, but decreased subcutaneous fat mainly after 6 months. Ipragliflozin lowered hepatobiliary enzyme levels after 12 months, which was not correlated with body weight loss or visceral fat reduction, while decreases in γ-GTP were correlated with subcutaneous fat reduction.

Oral SGLT2 inhibitor administration reduces body weight. Weight loss was reported with oral dapagliflozin administration [12] and with short-term (10 days) ipragliflozin treatment [4]. Japanese subjects given oral ipragliflozin showed body weight reduction of 3.3% in 16 weeks [10]. In our study, 12-month ipragliflozin administration resulted in weight loss of 3.6%. The mean BMI in Yamamoto et al. cohort [10] was 28.9 kg/m2, while that in our study was 35.1 kg/m2. Moreover 65% of subjects in our study were severely obese. Nevertheless, there was no difference in the weight reduction effect, suggesting that ipragliflozin is also effective in severely obese patients.

SGLT2 inhibitors were reported to reduce visceral fat and weight. Here, visceral fat was reduced by 7.8% in 3 months, which was similar to the previous report of 8.2% reduction by 16 weeks of 50 mg ipragliflozin [10]. A visceral fat loss trend was recognized after 6 months but was not significant. Visceral fat reduction by 8.1% with 300 mg of canagliflozin for 52 weeks was reported [1]. The lack of significant difference in our study was probably due to the small sample size. Subcutaneous fat decreased at all-time points. Body weight decrease may be attributed to visceral fat tissue lipolysis due to SGLT2 inhibitor induced enhancement in lipid metabolism [8]. Longterm empagliflozin treatment significantly reduced weight of subcutaneous but not visceral fat in rats [15]. They concluded that the decrease in body weight of rats treated with SGLT2 inhibitor was due to a decrease in subcutaneous rather than visceral fat, and suggested that body weight decrease may be due to visceral fat adipocyte hypertrophy and reduction of oxidative stress. Our results were consistent with this previous study. Detailed analyses of body fat content contributing to weight loss in humans are necessary.

In general, improvements in blood pressure and both carbohydrate and lipid metabolism are associated with diet therapy and can maintain weight loss of at least 3% [17]. Reduction of visceral fat is associated with decreases in metabolic risk factors [18]. Our results suggested that ipragliflozin may be an effective anti-obesity drug for obese patients, including those with severe obesity, in Japan.

Canagliflozin improved liver dysfunction in patients with T2D, assessed by monitoring serum AST, ALT, and γ-GTP levels [15]. Ogawa et al. reported that ipragliflozin improved liver function in clinical and basic research [19]. They showed that mouse liver weight and retroperitoneal fat mass were negatively correlated in mice. Our results indicated that hepatobiliary enzyme improvement was not correlated with decreases in visceral fat at any time point. Ogawa reported that liver fat decreased and posterior peritoneal adipose tissue in visceral fat increased in mice treated with ipragliflozin. It is impossible to distinguish between liver fat and other visceral fat by dual scan, which represents a limitation of our study.

Contrary to our expectations, changes in serum levels of GTP associated with ipragliflozin treatment were correlated with rate of subcutaneous fat decrease after 12 months. Further analysis of the relationship between subcutaneous fat and hepatobiliary enzyme levels is necessary.

Limitation

This study had several limitations. First the sample size was small. Second, patients using drugs that affect lipid metabolism (insulin, pioglitazone, and GLP1 analogs) were included. Third, this was a single-arm study. However, the number of participants met the minimum requirement for a prospective observational study, and concurrent use of anti-diabetic drugs is inevitable in clinical practice.

We will continue clinical research using image analysis, increase the number of subjects, and focus on the relationship between liver function and SGLT2 inhibitors.

Conclusion

Where proper dietary and nutritional guidance are provided, administration of the SGLT 2 inhibitor, ipragliflozin, induced weight loss and subcutaneous fat reduction over 12 months. Furthermore, ipragliflozin also improved liver function in obese patients, which was correlated with decrease of subcutaneous fat.

Acknowledgments

S.N. designed and performed the research, and wrote the manuscript. T.S performed the research, and wrote the manuscript. Y.T. performed the research. Y.O. contributed to data analysis. A.O. and A.K. contributed to discussion. M.K. reviewed and edited the manuscript. Authors thank Dr. Toru Aizawa for invaluable comments.

Disclosure Statement

S.N. has received research funding from Astellas Pharma Inc., AstraZeneca, Eli Lilly, MSD, and Takeda Pharmaceutical Co., Ltd. M.K. has received research funding from Takeda Pharmaceutical Co., Ltd., Ono Pharmaceutical Co., Ltd., Novartis Pharma, Sumitomo Dainippon Pharma, Mitsubishi Tanabe Pharma, Sanofi, Eli Lilly, Novo Nordisk, Kissei Pharmaceutical Co., Ltd., and MSD.

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