1
|
Kagawa T, Sugama J, Nishizaki H, Moritoh Y, Watanabe M. An Exploratory Randomized Trial of SCO-792, an Enteropeptidase Inhibitor, in Patients With Type 2 Diabetes and Albuminuria. Kidney Int Rep 2022; 8:115-125. [PMID: 36644351 PMCID: PMC9831944 DOI: 10.1016/j.ekir.2022.10.006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2022] [Revised: 09/29/2022] [Accepted: 10/03/2022] [Indexed: 11/06/2022] Open
Abstract
Introduction Elevated plasma amino acid levels overload kidney function by increasing glomerular filtration rate (GFR). Inhibiting gut amino acid intake may have therapeutic benefits for patients with kidney dysfunction. For a prospective phase 2a trial, we carried out an exploratory evaluation of the safety and efficacy of SCO-792, an enteropeptidase inhibitor that blocks gut amino acid intake, in patients with type 2 diabetes mellitus (T2DM) and albuminuria. Methods Seventy-two patients with T2DM, a urine albumin-to-creatinine ratio (UACR) of 200-5000 mg/g, and an estimated GFR >30 ml/min per 1.73 m2 were included. Patients were randomly assigned (1:2:2) to the following groups and received treatment for 12 weeks: placebo (n = 15), SCO-792 500 mg once daily (SCO-792 QD; n = 29), or SCO-792 500 mg 3 times daily (SCO-792 3 times a day (TID); n = 28) by following a double-blind approach. We evaluated UACR changes from the baseline along with safety as the primary end points and other parameters as secondary or exploratory end points. Results SCO-792 was safe and well tolerated up to 1500 mg/day for 12 weeks. UACR changes from baseline were -14% (P = 0.4407), -27% (P = 0.0271), and -28% (P = 0.0211) in placebo, SCO-792 QD, and SCO-792 TID, respectively, whereas UACR changes in SCO-792 groups were not statistically significant compared with placebo. The hemoglobin A1c (HbA1c) levels from baseline, an exploratory end point, decreased in the SCO-792 TID group. Conclusion SCO-792 was safe and well tolerated for 12 weeks and may be associated with decreased UACR in patients with T2DM and albuminuria. Further clinical studies are essential to confirm our findings.
Collapse
Affiliation(s)
- Tomoya Kagawa
- Clinical Development Department, SCOHIA PHARMA, Inc., Kanagawa, Japan
| | - Jun Sugama
- Drug Discovery Laboratories, SCOHIA PHARMA, Inc., Kanagawa, Japan
| | | | - Yusuke Moritoh
- Drug Discovery Laboratories, SCOHIA PHARMA, Inc., Kanagawa, Japan,Business Development Department, SCOHIA PHARMA, Inc., Kanagawa, Japan,Correspondence: Yusuke Moritoh or Masanori Watanabe, SCOHIA PHARMA, Inc., 26-1, Muraoka-higashi 2-chome, Fujisawa, Kanagawa 251-8555, Japan.
| | | |
Collapse
|
2
|
Kobayashi A, Abe SI, Watanabe M, Moritoh Y. Liquid chromatography-mass spectrometry measurements of blood diphosphoinositol pentakisphosphate levels. J Chromatogr A 2022; 1681:463450. [DOI: 10.1016/j.chroma.2022.463450] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2022] [Revised: 08/10/2022] [Accepted: 08/24/2022] [Indexed: 10/15/2022]
|
3
|
Katayama Y, Kawata Y, Moritoh Y, Watanabe M. Dichloroacetate, a pyruvate dehydrogenase kinase inhibitor, ameliorates type 2 diabetes via reduced gluconeogenesis. Heliyon 2022; 8:e08889. [PMID: 35169648 PMCID: PMC8829582 DOI: 10.1016/j.heliyon.2022.e08889] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2021] [Revised: 11/18/2021] [Accepted: 01/30/2022] [Indexed: 11/15/2022] Open
Abstract
Aims Pyruvate dehydrogenase (PDH) catalyzes the decarboxylation of pyruvate to acetyl-CoA, which plays a key role in linking cytosolic glycolysis to mitochondria metabolism. PDH is physiologically inactivated by pyruvate dehydrogenase kinases (PDKs). Thus, activation of PDH via inhibiting PDK may lead to metabolic benefits. In the present study, we investigated the antidiabetic effect of PDK inhibition using dichloroacetate (DCA), a PDK inhibitor. Main methods We evaluated the effect of single dose of DCA on plasma metabolic parameters in normal rats. Next, we investigated the antidiabetic effect of DCA in diabetic ob/ob mice. In addition, we performed in vitro assays to understand the effect and mechanism of action of DCA on gluconeogenesis in mouse myoblast cell line C2C12 and rat hepatoma cell line FaO. Key findings In normal rats, a single dose of DCA decreased the plasma level of pyruvate, the product of glycolysis, and the plasma glucose level only in the fasting state. Meanwhile, a single dose of DCA lowered the plasma glucose level, and a three-week treatment decreased the fructosamine level in diabetic ob/ob mice. In vitro experiments demonstrated concentration-dependent suppression of lactate production in C2C12 myotubes. In addition, DCA suppressed glucose production from pyruvate and lactate in FaO hepatoma cells. Thus, DCA-mediated restricted supply of gluconeogenic substrates from the muscle to liver, and direct suppression of hepatic gluconeogenesis might have contributed to its glucose-lowering effect in the current models. Significance PDK inhibitor may be considered as a potential antidiabetic agent harboring inhibitory effect on gluconeogenesis.
Collapse
|
4
|
Nishizaki H, Matsuoka O, Kagawa T, Kobayashi A, Watanabe M, Moritoh Y. Erratum. SCO-267, a GPR40 Full Agonist, Stimulates Islet and Gut Hormone Secretion and Improves Glycemic Control in Humans. Diabetes 2021;70:2364-2376. Diabetes 2021; 71:db22er01b. [PMID: 34716201 PMCID: PMC8978616 DOI: 10.2337/db22-er01b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
|
5
|
Nishizaki H, Matsuoka O, Kagawa T, Kobayashi A, Watanabe M, Moritoh Y. SCO-267, a GPR40 Full Agonist, Stimulates Islet and Gut Hormone Secretion and Improves Glycemic Control in Humans. Diabetes 2021; 70:2364-2376. [PMID: 34321316 PMCID: PMC8571351 DOI: 10.2337/db21-0451] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/21/2021] [Accepted: 07/20/2021] [Indexed: 11/21/2022]
Abstract
SCO-267 is a full agonist of the free fatty acid receptor 1 (GPR40), which regulates the secretion of islet and gut hormones. In this phase 1 study, we aimed to evaluate the clinical profile of single and multiple once-daily oral administration of SCO-267 in healthy adults and patients with diabetes. Plasma SCO-267 concentration was seen to increase in a dose-dependent manner after administration, and its plasma exposure was maintained for 24 h. Repeated dose did not alter the pharmacokinetic profile of SCO-267 in healthy adults. SCO-267 was generally safe and well tolerated at all evaluated single and multiple doses. Single and repeated doses of SCO-267 stimulated the secretion of insulin, glucagon, glucagon-like peptide 1, glucose-dependent insulinotropic polypeptide, and peptide YY in healthy adults. Furthermore, a single dose of SCO-267 stimulated the secretion of these hormones, decreased fasting hyperglycemia, and improved glycemic control during an oral glucose tolerance test in patients with diabetes, without inducing hypoglycemia. This study is the first to demonstrate the clinical effects of a GPR40 full agonist. SCO-267 is safe and well tolerated and exhibits once-daily oral dosing potential. Its robust therapeutic effects on hormonal secretion and glycemic control make SCO-267 an attractive drug candidate for the treatment of diabetes.
Collapse
Affiliation(s)
| | - Osamu Matsuoka
- Medical Corporation Heishinkai ToCROM Clinic, Tokyo, Japan
| | | | | | | | | |
Collapse
|
6
|
Moritoh Y, Abe SI, Akiyama H, Kobayashi A, Koyama R, Hara R, Kasai S, Watanabe M. The enzymatic activity of inositol hexakisphosphate kinase controls circulating phosphate in mammals. Nat Commun 2021; 12:4847. [PMID: 34381031 PMCID: PMC8358040 DOI: 10.1038/s41467-021-24934-8] [Citation(s) in RCA: 35] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2020] [Accepted: 07/15/2021] [Indexed: 12/20/2022] Open
Abstract
Circulating phosphate levels are tightly controlled within a narrow range in mammals. By using a novel small-molecule inhibitor, we show that the enzymatic activity of inositol hexakisphosphate kinases (IP6K) is essential for phosphate regulation in vivo. IP6K inhibition suppressed XPR1, a phosphate exporter, thereby decreasing cellular phosphate export, which resulted in increased intracellular ATP levels. The in vivo inhibition of IP6K decreased plasma phosphate levels without inhibiting gut intake or kidney reuptake of phosphate, demonstrating a pivotal role of IP6K-regulated cellular phosphate export on circulating phosphate levels. IP6K inhibition-induced decrease in intracellular inositol pyrophosphate, an enzymatic product of IP6K, was correlated with phosphate changes. Chronic IP6K inhibition alleviated hyperphosphataemia, increased kidney ATP, and improved kidney functions in chronic kidney disease rats. Our results demonstrate that the enzymatic activity of IP6K regulates circulating phosphate and intracellular ATP and suggest that IP6K inhibition is a potential novel treatment strategy against hyperphosphataemia. Inositol hexakisphosphate kinase (IP6K) is involved in diverse cellular signalling pathways, but the physiological roles of IP6K in vivo remain unknown in mammals. Here, the authors show that the enzymatic activity of IP6K is essential for phosphate regulation in vivo.
Collapse
Affiliation(s)
| | - Shin-Ichi Abe
- Research Division, SCOHIA PHARMA Inc, Kanagawa, Japan
| | | | | | | | - Ryoma Hara
- Research Division, SCOHIA PHARMA Inc, Kanagawa, Japan
| | - Shizuo Kasai
- Research Division, SCOHIA PHARMA Inc, Kanagawa, Japan
| | | |
Collapse
|
7
|
Katayama Y, Sugama J, Suzuki T, Ishimura Y, Kobayashi A, Moritoh Y, Watanabe M. Enteropeptidase inhibitor SCO-792 effectively prevents kidney function decline and fibrosis in a rat model of chronic kidney disease. Nephrol Dial Transplant 2021; 36:631-640. [PMID: 33351150 PMCID: PMC8008362 DOI: 10.1093/ndt/gfaa349] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2020] [Accepted: 11/13/2020] [Indexed: 12/25/2022] Open
Abstract
Background Inhibiting enteropeptidase, a gut serine protease regulating protein digestion, suppresses food intake and ameliorates obesity and diabetes in mice. However, the effects of enteropeptidase inhibition on kidney parameters are largely unknown. Here, we evaluated the chronic effects of an enteropeptidase inhibitor, SCO-792, on kidney function, albuminuria and kidney pathology in spontaneously hypercholesterolaemic (SHC) rats, a rat chronic kidney disease (CKD) model. Methods SCO-792, an orally available enteropeptidase inhibitor, was administered [0.03% and 0.06% (w/w) in the diet] to 20-week-old SHC rats showing albuminuria and progressive decline in glomerular filtration rate (GFR) for five weeks. The effects of SCO-792 and the contribution of amino acids to these effects were evaluated. Results SCO-792 increased the faecal protein content, indicating that SCO-792 inhibited enteropeptidase in SHC rats. Chronic treatment with SCO-792 prevented GFR decline and suppressed albuminuria. Moreover, SCO-792 improved glomerulosclerosis and kidney fibrosis. Pair feeding with SCO-792 (0.06%) was less effective in preventing GFR decline, albuminuria and renal histological damage than SCO-792 treatment, indicating the enteropeptidase-inhibition-dependent therapeutic effects of SCO-792. SCO-792 did not affect the renal plasma flow, suggesting that its effect on GFR was mediated by an improvement in filtration fraction. Moreover, SCO-792 increased hydrogen sulphide production capacity, which has a role in tissue protection. Finally, methionine and cysteine supplementation to the diet abrogated SCO-792-induced therapeutic effects on albuminuria. Conclusions SCO-792-mediated inhibition of enteropeptidase potently prevented GFR decline, albuminuria and kidney fibrosis; hence, it may have therapeutic potential against CKD.
Collapse
Affiliation(s)
- Yuko Katayama
- Research Division, SCOHIA PHARMA, Inc., Kanagawa, Japan
| | - Jun Sugama
- Research Division, SCOHIA PHARMA, Inc., Kanagawa, Japan
| | | | | | | | | | | |
Collapse
|
8
|
Ookawara M, Koyama R, Watanabe K, Sasaki S, Watanabe M, Moritoh Y. I
dentification of a novel small‐molecule allosteric inhibitor of glucose transporter type 5 for treating fructose‐induced diseases. FASEB J 2021. [DOI: 10.1096/fasebj.2021.35.s1.00470] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
|
9
|
Koyama R, Ookawara M, Watanabe M, Moritoh Y. Chronic Exposure to SCO-267, an Allosteric GPR40 Full Agonist, Is Effective in Improving Glycemic Control in Rats. Mol Pharmacol 2021; 99:286-293. [PMID: 33547250 DOI: 10.1124/molpharm.120.000168] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2020] [Accepted: 01/15/2021] [Indexed: 11/22/2022] Open
Abstract
Full agonist-mediated activation of free fatty acid receptor 1 (FFAR1/GPR40) alleviates diabetes in rodents. Considering that diabetes is a chronic disease, assessment of treatment durability of chronic exposure to a GPR40 full agonist is pivotal for treating patients with diabetes. However, the physiologic significance of chronic in vitro and in vivo exposure to GPR40 full agonists is largely unclear. Here, we evaluated the in vitro and in vivo effects of chronic treatment with SCO-267, a GPR40 full agonist, on signal transduction and glucose control. In vitro experiments showed that SCO-267 is an allosteric full agonist for GPR40, which activates the Gα q, Gα s, and Gα 12/13 pathways and β-arrestin recruitment. The calcium signal response was largely sustained in GPR40-overexpressing CHO cells even after prolonged incubation with SCO-267. To evaluate the in vivo relevance of chronic exposure to GPR40 full agonists, SCO-267 (1 and 10 mg/kg) was administered once daily to neonatally streptozotocin-induced diabetic rats for 15-33 days, and glucose control was evaluated. After 15 days of dosing followed by the drug washout period, SCO-267 improved glucose tolerance, most likely by increasing insulin sensitivity in rats. After 33 days, repeated exposure to SCO-267 was highly effective in improving glucose tolerance in rats. Furthermore, chronic exposure to SCO-267 increased pancreatic insulin content. These results demonstrated that even after chronic exposure, SCO-267 effectively activates GPR40 in cells and rats, suggesting the clinical application of SCO-267 in treating chronic diseases including diabetes. SIGNIFICANCE STATEMENT: GPR40 is a validated therapeutic target for diabetes. This study showed that even after chronic exposure, SCO-267, an allosteric GPR40 full agonist, effectively activates GPR40 in cells and rats; these results suggest a durable efficacy of SCO-267 in patients.
Collapse
Affiliation(s)
- Ryokichi Koyama
- Research Division, SCOHIA PHARMA, Inc., Fujisawa, Kanagawa, Japan
| | - Mitsugi Ookawara
- Research Division, SCOHIA PHARMA, Inc., Fujisawa, Kanagawa, Japan
| | | | - Yusuke Moritoh
- Research Division, SCOHIA PHARMA, Inc., Fujisawa, Kanagawa, Japan
| |
Collapse
|
10
|
Sugama J, Katayama Y, Moritoh Y, Watanabe M. Enteropeptidase inhibition improves kidney function in a rat model of diabetic kidney disease. Diabetes Obes Metab 2021; 23:86-96. [PMID: 32893449 PMCID: PMC7756647 DOI: 10.1111/dom.14190] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/10/2020] [Revised: 08/10/2020] [Accepted: 08/31/2020] [Indexed: 12/13/2022]
Abstract
AIM To examine the effects of an enteropeptidase inhibitor, SCO-792, on kidney function in rats. MATERIALS AND METHODS The pharmacological effects of SCO-792 were evaluated in Wistar fatty (WF) rats, a rat model of diabetic kidney disease (DKD). RESULTS Oral administration of SCO-792 increased faecal protein content and improved glycaemic control in WF rats. SCO-792 elicited a rapid decrease in urine albumin-to-creatinine ratio (UACR). SCO-792 also normalized glomerular hyperfiltration and decreased fibrosis, inflammation and tubular injury markers in the kidneys. However, pioglitazone-induced glycaemic improvement had no effect on kidney variables. Dietary supplementation of amino acids (AAs), which bypass the action of enteropeptidase inhibition, mitigated the effect of SCO-792 on UACR reduction, suggesting a pivotal role for enteropeptidase. Furthermore, autophagy activity in the glomerulus, which is impaired in DKD, was elevated in SCO-792-treated rats. Finally, a therapeutically additive effect on UACR reduction was observed with a combination of SCO-792 with irbesartan, an angiotensin II receptor blocker. CONCLUSIONS This study is the first to demonstrate that enteropeptidase inhibition is effective in improving disease conditions in DKD. SCO-792-induced therapeutic efficacy is likely to be independent of glycaemic control and mediated by the regulation of AAs and autophagy. Taken together with a combination effect of irbesartan, SCO-792 may be a novel therapeutic option for patients with DKD.
Collapse
|
11
|
Sugama J, Moritoh Y, Yashiro H, Tsuchimori K, Watanabe M. Enteropeptidase inhibition improves obesity by modulating gut microbiota composition and enterobacterial metabolites in diet-induced obese mice. Pharmacol Res 2021; 163:105337. [PMID: 33276106 DOI: 10.1016/j.phrs.2020.105337] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/20/2020] [Revised: 11/05/2020] [Accepted: 11/25/2020] [Indexed: 12/19/2022]
Abstract
Enteropeptidase is a transmembrane serine protease localized in the lumen of the duodenum that acts as a key enzyme for protein digestion. SCO-792 is an orally available enteropeptidase inhibitor that has been reported to have therapeutic effects on obesity and diabetes in mice. However, the mechanism underlying the therapeutic effect of SCO-792 has not yet been fully elucidated. In this study, we evaluated the role of gut microbiota on SCO-792-induced body weight (BW) reduction in high-fat diet-induced obese (DIO) mice. Chronic administration of SCO-792 substantially decreased BW and food intake in DIO mice. While the pair-fed study uncovered food intake-independent mechanisms of BW reduction by SCO-792. Interestingly, antibiotics-induced microbiota elimination in the gut canceled SCO-792-induced BW reduction by nearly half without affecting the anorectic effect, indicating the involvement of gut microbiota in the anti-obesity mechanism that is independent of food intake reduction. Microbiome analysis revealed that SCO-792 altered the gut microbiota composition in DIO mice. Notably, it was found that the abundance of Firmicutes decreased while that of Verrucomicrobia increased at the phylum level. Increased abundance of Akkermansia muciniphila, a bacterium known to be useful for host metabolism, was observed in SCO-792-treated mice. Fecal metabolome analysis revealed increased amino acid levels, indicating gut enteropeptidase inhibition. In addition, SCO-792 was found to increase the level of short-chain fatty acids, including propionate, and bile acids in the feces, which all help maintain gut health and improve metabolism. Furthermore, it was found that SCO-792 induced the elevation of colonic immunoglobulin A (IgA) concentration, which may maintain the microbiota condition, in DIO mice. In conclusion, this study demonstrates the contribution of microbiota to SCO-792-induced BW reduction. Enteropeptidase-mediated regulation of microbiota, enterobacterial metabolites, and IgA in the gut may coordinately drive the therapeutic effects of SCO-792 in obesity.
Collapse
Affiliation(s)
- Jun Sugama
- Research and Development Division, SCOHIA PHARMA Inc., Kanagawa, Japan.
| | - Yusuke Moritoh
- Research and Development Division, SCOHIA PHARMA Inc., Kanagawa, Japan.
| | - Hiroaki Yashiro
- Pharmaceutical Research Division, Takeda Pharmaceutical Company Limited, Kanagawa, Japan
| | - Kazue Tsuchimori
- Pharmaceutical Research Division, Takeda Pharmaceutical Company Limited, Kanagawa, Japan
| | - Masanori Watanabe
- Research and Development Division, SCOHIA PHARMA Inc., Kanagawa, Japan.
| |
Collapse
|
12
|
Furukawa H, Miyamoto Y, Hirata Y, Watanabe K, Hitomi Y, Yoshitomi Y, Aida J, Noguchi N, Takakura N, Takami K, Miwatashi S, Hirozane Y, Hamada T, Ito R, Ookawara M, Moritoh Y, Watanabe M, Maekawa T. Design and Identification of a GPR40 Full Agonist ( SCO-267) Possessing a 2-Carbamoylphenyl Piperidine Moiety. J Med Chem 2020; 63:10352-10379. [PMID: 32900194 DOI: 10.1021/acs.jmedchem.0c00843] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
GPR40/FFAR1 is a G-protein-coupled receptor expressed in pancreatic β-cells and enteroendocrine cells. GPR40 activation stimulates secretions of insulin and incretin, both of which are the pivotal regulators of glycemic control. Therefore, a GPR40 agonist is an attractive target for the treatment of type 2 diabetes mellitus. Using the reported biaryl derivative 1, we shifted the hydrophobic moiety to the terminal aryl ring and replaced the central aryl ring with piperidine, generating 2-(4,4-dimethylpentyl)phenyl piperidine 4a, which had improved potency for GPR40 and high lipophilicity. We replaced the hydrophobic moiety with N-alkyl-N-aryl benzamides to lower the lipophilicity and restrict the N-alkyl moieties to the presumed lipophilic pocket using the intramolecular π-π stacking of cis-preferential N-alkyl-N-aryl benzamide. Among these, orally available (3S)-3-cyclopropyl-3-(2-((1-(2-((2,2-dimethylpropyl)(6-methylpyridin-2-yl)carbamoyl)-5-methoxyphenyl)piperidin-4-yl)methoxy)pyridin-4-yl)propanoic acid (SCO-267) effectively stimulated insulin secretion and GLP-1 release and ameliorated glucose tolerance in diabetic rats via GPR40 full agonism.
Collapse
Affiliation(s)
- Hideki Furukawa
- Research, Takeda Pharmaceutical Company, Ltd., Shonan Health Innovation Park, 26-1, Muraoka-Higashi 2-Chome, Fujisawa, Kanagawa 251-8555, Japan
| | - Yasufumi Miyamoto
- Research, Takeda Pharmaceutical Company, Ltd., Shonan Health Innovation Park, 26-1, Muraoka-Higashi 2-Chome, Fujisawa, Kanagawa 251-8555, Japan
| | - Yasuhiro Hirata
- Research, Takeda Pharmaceutical Company, Ltd., Shonan Health Innovation Park, 26-1, Muraoka-Higashi 2-Chome, Fujisawa, Kanagawa 251-8555, Japan
| | - Koji Watanabe
- Research Division, SCOHIA PHARMA Inc., Shonan Health Innovation Park, 26-1, Muraoka-Higashi 2-Chome, Fujisawa, Kanagawa 251-8555, Japan
| | - Yuko Hitomi
- Research, Takeda Pharmaceutical Company, Ltd., Shonan Health Innovation Park, 26-1, Muraoka-Higashi 2-Chome, Fujisawa, Kanagawa 251-8555, Japan
| | - Yayoi Yoshitomi
- Research, Takeda Pharmaceutical Company, Ltd., Shonan Health Innovation Park, 26-1, Muraoka-Higashi 2-Chome, Fujisawa, Kanagawa 251-8555, Japan
| | - Jumpei Aida
- Research, Takeda Pharmaceutical Company, Ltd., Shonan Health Innovation Park, 26-1, Muraoka-Higashi 2-Chome, Fujisawa, Kanagawa 251-8555, Japan
| | - Naoyoshi Noguchi
- Research Division, SCOHIA PHARMA Inc., Shonan Health Innovation Park, 26-1, Muraoka-Higashi 2-Chome, Fujisawa, Kanagawa 251-8555, Japan
| | - Nobuyuki Takakura
- Research, Takeda Pharmaceutical Company, Ltd., Shonan Health Innovation Park, 26-1, Muraoka-Higashi 2-Chome, Fujisawa, Kanagawa 251-8555, Japan
| | - Kazuaki Takami
- Research, Takeda Pharmaceutical Company, Ltd., Shonan Health Innovation Park, 26-1, Muraoka-Higashi 2-Chome, Fujisawa, Kanagawa 251-8555, Japan
| | - Seiji Miwatashi
- Research, Takeda Pharmaceutical Company, Ltd., Shonan Health Innovation Park, 26-1, Muraoka-Higashi 2-Chome, Fujisawa, Kanagawa 251-8555, Japan
| | - Yoshihiko Hirozane
- Research, Takeda Pharmaceutical Company, Ltd., Shonan Health Innovation Park, 26-1, Muraoka-Higashi 2-Chome, Fujisawa, Kanagawa 251-8555, Japan
| | - Teruki Hamada
- Research, Takeda Pharmaceutical Company, Ltd., Shonan Health Innovation Park, 26-1, Muraoka-Higashi 2-Chome, Fujisawa, Kanagawa 251-8555, Japan
| | - Ryo Ito
- Research, Takeda Pharmaceutical Company, Ltd., Shonan Health Innovation Park, 26-1, Muraoka-Higashi 2-Chome, Fujisawa, Kanagawa 251-8555, Japan
| | - Mitsugi Ookawara
- Research Division, SCOHIA PHARMA Inc., Shonan Health Innovation Park, 26-1, Muraoka-Higashi 2-Chome, Fujisawa, Kanagawa 251-8555, Japan
| | - Yusuke Moritoh
- Research Division, SCOHIA PHARMA Inc., Shonan Health Innovation Park, 26-1, Muraoka-Higashi 2-Chome, Fujisawa, Kanagawa 251-8555, Japan
| | - Masanori Watanabe
- Research Division, SCOHIA PHARMA Inc., Shonan Health Innovation Park, 26-1, Muraoka-Higashi 2-Chome, Fujisawa, Kanagawa 251-8555, Japan
| | - Tsuyoshi Maekawa
- Research Division, SCOHIA PHARMA Inc., Shonan Health Innovation Park, 26-1, Muraoka-Higashi 2-Chome, Fujisawa, Kanagawa 251-8555, Japan
| |
Collapse
|
13
|
Ookawara M, Matsuda K, Watanabe M, Moritoh Y. The GPR40 Full Agonist SCO-267 Improves Liver Parameters in a Mouse Model of Nonalcoholic Fatty Liver Disease without Affecting Glucose or Body Weight. J Pharmacol Exp Ther 2020; 375:21-27. [PMID: 32719069 DOI: 10.1124/jpet.120.000046] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2020] [Accepted: 07/21/2020] [Indexed: 12/14/2022] Open
Abstract
Full agonism of G-protein-coupled receptor 40 (GPR40)/free fatty acid 1 receptor improves glycemic control in diabetic rodents. However, the effects of GPR40 full agonism on liver parameters are largely unknown. In the present study, we examined the effects of a GPR40 full agonist, SCO-267, on liver parameters in a nondiabetic mouse model with early-stage nonalcoholic fatty liver disease (NAFLD). SCO-267 was orally administered to mice, which were fed a choline-deficient, l-amino acid-defined, high-fat diet (CDAHFD), a mouse model for NAFLD. An oral dose of SCO-267 increased levels of circulating glucagon and glucagon-like peptide-1 in CDAHFD-fed mice. In a chronic-dose experiment, effects of SCO-267 were compared with those of a dipeptidyl peptidase-4 inhibitor (alogliptin) and a sodium glucose cotransporter 2 inhibitor (dapagliflozin). SCO-267 decreased liver triglyceride content, weight, collagen content, and plasma alanine aminotransferase (ALT) levels without affecting food intake or glucose levels in CDAHFD-fed mice. Furthermore, SCO-267 decreased levels of liver thiobarbituric acid reactive substances (TBARS), markers of oxidative stress. Alogliptin and dapagliflozin had no effect on liver weight or levels of triglyceride, collagen, plasma ALT, and liver TBARS. SCO-267 elevated mRNA levels of molecules with roles in mitochondrial function and β-oxidation while inhibiting those with roles in lipogenesis, inflammation, reactive oxygen species generation, and fibrosis in the liver, all of which were less evident with alogliptin and dapagliflozin. This is the first study to show that the GPR40 full agonist SCO-267 improves liver parameters without affecting glucose or body weight in a mouse model of NAFLD. SIGNIFICANCE STATEMENT: Full agonism of GPR40/free fatty acid 1 receptor signaling stimulates islet and gut hormone secretions. The present study is the first to show the treatment effects of GPR40 full agonism on liver parameters in a mouse model for nonalcoholic fatty liver disease.
Collapse
|
14
|
Yashiro H, Hamagami K, Hiyoshi H, Sugama J, Tsuchimori K, Yamaguchi F, Moritoh Y, Sasaki M, Maekawa T, Yamada Y, Watanabe M. SCO-792, an enteropeptidase inhibitor, improves disease status of diabetes and obesity in mice. Diabetes Obes Metab 2019; 21:2228-2239. [PMID: 31144422 PMCID: PMC6771630 DOI: 10.1111/dom.13799] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/26/2019] [Revised: 05/22/2019] [Accepted: 05/28/2019] [Indexed: 12/23/2022]
Abstract
AIMS Enteropeptidase is a serine protease localized on the duodenal brush border that catalyzes the conversion of inactive trypsinogen into active trypsin, thereby regulating protein breakdown in the gut. We evaluated the effects of SCO-792, a novel enteropeptidase inhibitor, in mice. MATERIALS AND METHODS In vivo inhibition of enteropeptidase was evaluated via an oral protein challenge. Pharmacological effects were evaluated in normal mice, in diet-induced obese (DIO) mice and in obese and diabetic ob/ob mice. RESULTS A single oral administration of SCO-792 inhibited plasma branched-chain amino acids (BCAAs) in an oral protein challenge test in mice, indicating in vivo inhibition of enteropeptidase. Repeated treatment with SCO-792 induced reduction in food intake and decrease in body weight in DIO and ob/ob mice. Plasma FGF21 levels were increased in SCO-792-treated DIO mice, an observation that was probably independent of reduction in food intake. Hyperglycaemia was markedly improved in SCO-792-treated ob/ob mice. A hyperinsulinaemic-euglycaemic clamp study revealed improved muscle insulin sensitivity in SCO-792-treated ob/ob mice. SCO-792 also improved plasma and liver lipid profiles and decreased plasma alanine transaminase, suggesting a potential treatment for liver diseases. Dietary supplementation with essential amino acids attenuated the effect of SCO-792 on reduction in food intake and decrease in body weight in normal mice, suggesting a pivotal role for enteropeptidase in these biological phenomena. CONCLUSIONS SCO-792 inhibited enteropeptidase in vivo, reduced food intake, decreased body weight, increased insulin sensitivity, improved glucose and lipid control, and ameliorated liver parameters in mouse models with obesity and/or diabetes. SCO-792 may exhibit similar effects in patients.
Collapse
Affiliation(s)
- Hiroaki Yashiro
- Pharmaceutical Research DivisionTakeda Pharmaceutical Company LimitedKanagawaJapan
| | - Kenichi Hamagami
- Pharmaceutical Research DivisionTakeda Pharmaceutical Company LimitedKanagawaJapan
| | - Hideyuki Hiyoshi
- Pharmaceutical Research DivisionTakeda Pharmaceutical Company LimitedKanagawaJapan
| | - Jun Sugama
- Research and Development DivisionSCOHIA PHARMA, Inc.KanagawaJapan
| | - Kazue Tsuchimori
- Pharmaceutical Research DivisionTakeda Pharmaceutical Company LimitedKanagawaJapan
| | | | - Yusuke Moritoh
- Research and Development DivisionSCOHIA PHARMA, Inc.KanagawaJapan
| | - Minoru Sasaki
- Pharmaceutical Research DivisionTakeda Pharmaceutical Company LimitedKanagawaJapan
| | - Tsuyoshi Maekawa
- Research and Development DivisionSCOHIA PHARMA, Inc.KanagawaJapan
| | - Yukio Yamada
- Research and Development DivisionSCOHIA PHARMA, Inc.KanagawaJapan
| | | |
Collapse
|
15
|
Sasaki M, Miyahisa I, Itono S, Yashiro H, Hiyoshi H, Tsuchimori K, Hamagami K, Moritoh Y, Watanabe M, Tohyama K, Sasaki M, Sakamoto J, Kawamoto T. Discovery and characterization of a small-molecule enteropeptidase inhibitor, SCO-792. Pharmacol Res Perspect 2019; 7:e00517. [PMID: 31508234 PMCID: PMC6726858 DOI: 10.1002/prp2.517] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2019] [Revised: 07/19/2019] [Accepted: 07/26/2019] [Indexed: 12/11/2022] Open
Abstract
Enteropeptidase, localized into the duodenum brush border, is a key enzyme catalyzing the conversion of pancreatic trypsinogen proenzyme to active trypsin, thereby regulating protein digestion and energy homeostasis. We report the discovery and pharmacological profiles of SCO-792, a novel inhibitor of enteropeptidase. A screen employing fluorescence resonance energy transfer was performed to identify enteropeptidase inhibitors. Inhibitory profiles were determined by in vitro assays. To evaluate the in vivo inhibitory effect on protein digestion, an oral protein challenge test was performed in rats. Our screen identified a series of enteropeptidase inhibitors, and compound optimization resulted in identification of SCO-792, which inhibited enteropeptidase activity in vitro, with IC 50 values of 4.6 and 5.4 nmol/L in rats and humans, respectively. In vitro inhibition of enteropeptidase by SCO-792 was potentiated by increased incubation time, and the calculated Kinact/KI was 82 000/mol/L s. An in vitro dissociation assay showed that SCO-792 had a dissociation half-life of almost 14 hour, with a calculated koff rate of 0.047/hour, which suggested that SCO-792 is a reversible enteropeptidase inhibitor. In normal rats, a ≤4 hour prior oral dose of SCO-792 effectively inhibited plasma elevation of branched-chain amino acids in an oral protein challenge test, which indicated that SCO-792 effectively inhibited protein digestion in vivo. In conclusion, our new screen system identified SCO-792 as a potent and reversible inhibitor against enteropeptidase. SCO-792 slowly dissociated from enteropeptidase in vitro and inhibited protein digestion in vivo. Further study using SCO-792 could reveal the effects of inhibiting enteropeptidase on biological actions.
Collapse
Affiliation(s)
- Masako Sasaki
- ResearchTakeda Pharmaceutical Company LimitedFujisawaKanagawaJapan
| | - Ikuo Miyahisa
- ResearchTakeda Pharmaceutical Company LimitedFujisawaKanagawaJapan
| | - Sachiko Itono
- ResearchTakeda Pharmaceutical Company LimitedFujisawaKanagawaJapan
- Present address:
Axcelead Drug Discovery Partners, Inc.FujisawaKanagawaJapan
| | - Hiroaki Yashiro
- ResearchTakeda Pharmaceutical Company LimitedFujisawaKanagawaJapan
| | - Hideyuki Hiyoshi
- ResearchTakeda Pharmaceutical Company LimitedFujisawaKanagawaJapan
| | - Kazue Tsuchimori
- ResearchTakeda Pharmaceutical Company LimitedFujisawaKanagawaJapan
| | | | | | | | - Kimio Tohyama
- ResearchTakeda Pharmaceutical Company LimitedFujisawaKanagawaJapan
| | - Minoru Sasaki
- ResearchTakeda Pharmaceutical Company LimitedFujisawaKanagawaJapan
| | - Jun‐ichi Sakamoto
- ResearchTakeda Pharmaceutical Company LimitedFujisawaKanagawaJapan
- Present address:
Axcelead Drug Discovery Partners, Inc.FujisawaKanagawaJapan
| | - Tomohiro Kawamoto
- ResearchTakeda Pharmaceutical Company LimitedFujisawaKanagawaJapan
- Present address:
Axcelead Drug Discovery Partners, Inc.FujisawaKanagawaJapan
| |
Collapse
|
16
|
Ueno H, Ito R, Abe SI, Ookawara M, Miyashita H, Ogino H, Miyamoto Y, Yoshihara T, Kobayashi A, Tsujihata Y, Takeuchi K, Watanabe M, Yamada Y, Maekawa T, Nishigaki N, Moritoh Y. SCO-267, a GPR40 Full Agonist, Improves Glycemic and Body Weight Control in Rat Models of Diabetes and Obesity. J Pharmacol Exp Ther 2019; 370:172-181. [DOI: 10.1124/jpet.118.255885] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2018] [Accepted: 04/01/2019] [Indexed: 12/14/2022] Open
|
17
|
Ramracheya R, Chapman C, Chibalina M, Dou H, Miranda C, González A, Moritoh Y, Shigeto M, Zhang Q, Braun M, Clark A, Johnson PR, Rorsman P, Briant LJB. GLP-1 suppresses glucagon secretion in human pancreatic alpha-cells by inhibition of P/Q-type Ca 2+ channels. Physiol Rep 2018; 6:e13852. [PMID: 30187652 PMCID: PMC6125244 DOI: 10.14814/phy2.13852] [Citation(s) in RCA: 52] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2018] [Revised: 07/31/2018] [Accepted: 08/07/2018] [Indexed: 01/13/2023] Open
Abstract
Glucagon is the body's main hyperglycemic hormone, and its secretion is dysregulated in type 2 diabetes mellitus (T2DM). The incretin hormone glucagon-like peptide-1 (GLP-1) is released from the gut and is used in T2DM therapy. Uniquely, it both stimulates insulin and inhibits glucagon secretion and thereby lowers plasma glucose levels. In this study, we have investigated the action of GLP-1 on glucagon release from human pancreatic islets. Immunocytochemistry revealed that only <0.5% of the α-cells possess detectable GLP-1R immunoreactivity. Despite this, GLP-1 inhibited glucagon secretion by 50-70%. This was due to a direct effect on α-cells, rather than paracrine signaling, because the inhibition was not reversed by the insulin receptor antagonist S961 or the somatostatin receptor-2 antagonist CYN154806. The inhibitory effect of GLP-1 on glucagon secretion was prevented by the PKA-inhibitor Rp-cAMPS and mimicked by the adenylate cyclase activator forskolin. Electrophysiological measurements revealed that GLP-1 decreased action potential height and depolarized interspike membrane potential. Mathematical modeling suggests both effects could result from inhibition of P/Q-type Ca2+ channels. In agreement with this, GLP-1 and ω-agatoxin (a blocker of P/Q-type channels) inhibited glucagon secretion in islets depolarized by 70 mmol/L [K+ ]o , and these effects were not additive. Intracellular application of cAMP inhibited depolarization-evoked exocytosis in individual α-cells by a PKA-dependent (Rp-cAMPS-sensitive) mechanism. We propose that inhibition of glucagon secretion by GLP-1 involves activation of the few GLP-1 receptors present in the α-cell membrane. The resulting small elevation of cAMP leads to PKA-dependent inhibition of P/Q-type Ca2+ channels and suppression of glucagon exocytosis.
Collapse
Affiliation(s)
- Reshma Ramracheya
- Oxford Centre for Diabetes, Endocrinology and Metabolism, Radcliffe Department of MedicineUniversity of OxfordOxfordUnited Kingdom
| | - Caroline Chapman
- Oxford Centre for Diabetes, Endocrinology and Metabolism, Radcliffe Department of MedicineUniversity of OxfordOxfordUnited Kingdom
| | - Margarita Chibalina
- Oxford Centre for Diabetes, Endocrinology and Metabolism, Radcliffe Department of MedicineUniversity of OxfordOxfordUnited Kingdom
| | - Haiqiang Dou
- Institute of Neuroscience and PhysiologyMetabolic Research UnitUniversity of GöteborgGöteborgSweden
| | - Caroline Miranda
- Institute of Neuroscience and PhysiologyMetabolic Research UnitUniversity of GöteborgGöteborgSweden
| | - Alejandro González
- Oxford Centre for Diabetes, Endocrinology and Metabolism, Radcliffe Department of MedicineUniversity of OxfordOxfordUnited Kingdom
| | - Yusuke Moritoh
- Oxford Centre for Diabetes, Endocrinology and Metabolism, Radcliffe Department of MedicineUniversity of OxfordOxfordUnited Kingdom
| | - Makoto Shigeto
- Oxford Centre for Diabetes, Endocrinology and Metabolism, Radcliffe Department of MedicineUniversity of OxfordOxfordUnited Kingdom
| | - Quan Zhang
- Oxford Centre for Diabetes, Endocrinology and Metabolism, Radcliffe Department of MedicineUniversity of OxfordOxfordUnited Kingdom
| | - Matthias Braun
- Oxford Centre for Diabetes, Endocrinology and Metabolism, Radcliffe Department of MedicineUniversity of OxfordOxfordUnited Kingdom
| | - Anne Clark
- Oxford Centre for Diabetes, Endocrinology and Metabolism, Radcliffe Department of MedicineUniversity of OxfordOxfordUnited Kingdom
| | - Paul R. Johnson
- Nuffield Department of SurgeryUniversity of OxfordJohn Radcliffe HospitalOxfordUnited Kingdom
- NIHR Oxford Biomedical Research CentreOxfordUnited Kingdom
| | - Patrik Rorsman
- Oxford Centre for Diabetes, Endocrinology and Metabolism, Radcliffe Department of MedicineUniversity of OxfordOxfordUnited Kingdom
- Institute of Neuroscience and PhysiologyMetabolic Research UnitUniversity of GöteborgGöteborgSweden
- NIHR Oxford Biomedical Research CentreOxfordUnited Kingdom
| | - Linford J. B. Briant
- Oxford Centre for Diabetes, Endocrinology and Metabolism, Radcliffe Department of MedicineUniversity of OxfordOxfordUnited Kingdom
- Department of Computer ScienceUniversity of OxfordOxfordUnited Kingdom
| |
Collapse
|
18
|
Moritoh Y, Oka M, Yasuhara Y, Hozumi H, Iwachidow K, Fuse H, Tozawa R. Inositol Hexakisphosphate Kinase 3 Regulates Metabolism and Lifespan in Mice. Sci Rep 2016; 6:32072. [PMID: 27577108 PMCID: PMC5006000 DOI: 10.1038/srep32072] [Citation(s) in RCA: 49] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2016] [Accepted: 08/02/2016] [Indexed: 12/26/2022] Open
Abstract
Inositol hexakisphosphate kinase 3 (IP6K3) generates inositol pyrophosphates, which regulate diverse cellular functions. However, little is known about its own physiological role. Here, we show the roles of IP6K3 in metabolic regulation. We detected high levels of both mouse and human IP6K3 mRNA in myotubes and muscle tissues. In human myotubes, IP6K3 was upregulated by dexamethasone treatment, which is known to inhibit glucose metabolism. Furthermore, Ip6k3 expression was elevated under diabetic, fasting, and disuse conditions in mouse skeletal muscles. Ip6k3(-/-) mice demonstrated lower blood glucose, reduced circulating insulin, deceased fat mass, lower body weight, increased plasma lactate, enhanced glucose tolerance, lower glucose during an insulin tolerance test, and reduced muscle Pdk4 expression under normal diet conditions. Notably, Ip6k3 deletion extended animal lifespan with concomitant reduced phosphorylation of S6 ribosomal protein in the heart. In contrast, Ip6k3(-/-) mice showed unchanged skeletal muscle mass and no resistance to the effects of high fat diet. The current observations suggest novel roles of IP6K3 in cellular regulation, which impact metabolic control and lifespan.
Collapse
Affiliation(s)
- Yusuke Moritoh
- Cardiovascular and Metabolic Drug Discovery Unit, Pharmaceutical Research Division, Takeda Pharmaceutical Company Limited, Fujisawa, Japan
| | - Masahiro Oka
- Cardiovascular and Metabolic Drug Discovery Unit, Pharmaceutical Research Division, Takeda Pharmaceutical Company Limited, Fujisawa, Japan
| | - Yoshitaka Yasuhara
- Cardiovascular and Metabolic Drug Discovery Unit, Pharmaceutical Research Division, Takeda Pharmaceutical Company Limited, Fujisawa, Japan
| | - Hiroyuki Hozumi
- Cardiovascular and Metabolic Drug Discovery Unit, Pharmaceutical Research Division, Takeda Pharmaceutical Company Limited, Fujisawa, Japan
| | - Kimihiko Iwachidow
- Integrated Technology Research Laboratories, Pharmaceutical Research Division, Takeda Pharmaceutical Company Limited, Fujisawa, Japan
| | - Hiromitsu Fuse
- Integrated Technology Research Laboratories, Pharmaceutical Research Division, Takeda Pharmaceutical Company Limited, Fujisawa, Japan
| | - Ryuichi Tozawa
- Cardiovascular and Metabolic Drug Discovery Unit, Pharmaceutical Research Division, Takeda Pharmaceutical Company Limited, Fujisawa, Japan
| |
Collapse
|
19
|
Maezaki H, Banno Y, Miyamoto Y, Moritoh Y, Asakawa T, Kataoka O, Takeuchi K, Suzuki N, Ikedo K, Kosaka T, Sasaki M, Tsubotani S, Tani A, Funami M, Yamamoto Y, Tawada M, Aertgeerts K, Yano J, Oi S. Corrigendum to “Discovery of potent, selective, and orally bioavailable quinoline-based dipeptidyl peptidase IV inhibitors targeting Lys554” [Bioorg. Med. Chem. 19 (2011) 4482–4498]. Bioorg Med Chem 2011. [DOI: 10.1016/j.bmc.2011.07.025] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
|
20
|
Moritoh Y, Takeuchi K, Hazama M. Combination treatment with alogliptin and voglibose increases active GLP-1 circulation, prevents the development of diabetes and preserves pancreatic beta-cells in prediabetic db/db mice. Diabetes Obes Metab 2011. [PMID: 20151999 DOI: 10.1111/j.1463-1326.2009.01156] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
AIM Alogliptin, a dipeptidyl peptidase-4 (DPP-4) inhibitor, and voglibose, an alpha-glucosidase inhibitor, have different but complementary mechanisms of action on glucagon-like peptide-1 (GLP-1) regulation and glucose-lowering effects. The present study evaluated the chronic effects of combination treatment with alogliptin and voglibose in prediabetic db/db mice. METHODS Alogliptin (0.03%) and voglibose (0.001%) alone or in combination were administered in the diet to prediabetic db/db mice. RESULTS After 3 weeks, voglibose treatment increased GLP-1 secretion (voglibose alone, 1.6-fold; alogliptin plus voglibose, 1.5-fold), while it decreased plasma glucose-dependent insulinotropic polypeptide (GIP) (voglibose alone, -30%; alogliptin plus voglibose, -29%). Alogliptin, voglibose and combination treatment decreased plasma DPP-4 activity by 72, 15 and additively by 80%, respectively, and increased plasma active GLP-1 levels by 4.5-, 1.8- and synergistically by 9.1-fold respectively. Combination treatment increased plasma insulin by 3.6-fold (alogliptin alone, 1.3-fold; voglibose alone, 1.8-fold), decreased plasma glucagon by 30% (alogliptin alone, 11%; voglibose alone, 8%), and prevented the development of diabetes, much more effectively than either agent alone. After 4 weeks, alogliptin, voglibose and combination treatment increased pancreatic insulin content by 1.6-, 3.4- and synergistically by 8.5-fold respectively. Furthermore, combination treatment resulted in an increased expression of insulin, pancreatic and duodenal homeobox 1 (PDX1) and glucose transporter 2 (GLUT2), and maintenance of normal beta/alpha-cell distribution in the pancreatic islet. CONCLUSIONS Chronic treatment with alogliptin in combination with voglibose concurrently increased active GLP-1 circulation, increased insulin secretion, decreased glucagon secretion, prevented the onset of the disease, and preserved pancreatic beta-cells and islet structure in prediabetic db/db mice.
Collapse
Affiliation(s)
- Y Moritoh
- Pharmacology Research Laboratories, Pharmaceutical Research Division, Takeda Pharmaceutical Company Limited, Osaka, Japan.
| | | | | |
Collapse
|
21
|
Miyamoto Y, Banno Y, Yamashita T, Fujimoto T, Oi S, Moritoh Y, Asakawa T, Kataoka O, Yashiro H, Takeuchi K, Suzuki N, Ikedo K, Kosaka T, Tsubotani S, Tani A, Sasaki M, Funami M, Amano M, Yamamoto Y, Aertgeerts K, Yano J, Maezaki H. Discovery of a 3-Pyridylacetic Acid Derivative (TAK-100) as a Potent, Selective and Orally Active Dipeptidyl Peptidase IV (DPP-4) Inhibitor. J Med Chem 2011; 54:831-50. [DOI: 10.1021/jm101236h] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Yasufumi Miyamoto
- Pharmaceutical Research Division, Takeda Pharmaceutical Company Limited, 17-85, Jusohonmachi 2-Chome, Yodogawa-ku, Osaka 532-8686, Japan
| | - Yoshihiro Banno
- Pharmaceutical Research Division, Takeda Pharmaceutical Company Limited, 17-85, Jusohonmachi 2-Chome, Yodogawa-ku, Osaka 532-8686, Japan
| | - Tohru Yamashita
- Pharmaceutical Research Division, Takeda Pharmaceutical Company Limited, 17-85, Jusohonmachi 2-Chome, Yodogawa-ku, Osaka 532-8686, Japan
| | - Tatsuhiko Fujimoto
- Pharmaceutical Research Division, Takeda Pharmaceutical Company Limited, 17-85, Jusohonmachi 2-Chome, Yodogawa-ku, Osaka 532-8686, Japan
| | - Satoru Oi
- Pharmaceutical Research Division, Takeda Pharmaceutical Company Limited, 17-85, Jusohonmachi 2-Chome, Yodogawa-ku, Osaka 532-8686, Japan
| | - Yusuke Moritoh
- Pharmaceutical Research Division, Takeda Pharmaceutical Company Limited, 17-85, Jusohonmachi 2-Chome, Yodogawa-ku, Osaka 532-8686, Japan
| | - Tomoko Asakawa
- Pharmaceutical Research Division, Takeda Pharmaceutical Company Limited, 17-85, Jusohonmachi 2-Chome, Yodogawa-ku, Osaka 532-8686, Japan
| | - Osamu Kataoka
- Pharmaceutical Research Division, Takeda Pharmaceutical Company Limited, 17-85, Jusohonmachi 2-Chome, Yodogawa-ku, Osaka 532-8686, Japan
| | - Hiroaki Yashiro
- Pharmaceutical Research Division, Takeda Pharmaceutical Company Limited, 17-85, Jusohonmachi 2-Chome, Yodogawa-ku, Osaka 532-8686, Japan
| | - Koji Takeuchi
- Pharmaceutical Research Division, Takeda Pharmaceutical Company Limited, 17-85, Jusohonmachi 2-Chome, Yodogawa-ku, Osaka 532-8686, Japan
| | - Nobuhiro Suzuki
- Pharmaceutical Research Division, Takeda Pharmaceutical Company Limited, 17-85, Jusohonmachi 2-Chome, Yodogawa-ku, Osaka 532-8686, Japan
| | - Koji Ikedo
- Pharmaceutical Research Division, Takeda Pharmaceutical Company Limited, 17-85, Jusohonmachi 2-Chome, Yodogawa-ku, Osaka 532-8686, Japan
| | - Takuo Kosaka
- Pharmaceutical Research Division, Takeda Pharmaceutical Company Limited, 17-85, Jusohonmachi 2-Chome, Yodogawa-ku, Osaka 532-8686, Japan
| | - Shigetoshi Tsubotani
- Pharmaceutical Research Division, Takeda Pharmaceutical Company Limited, 17-85, Jusohonmachi 2-Chome, Yodogawa-ku, Osaka 532-8686, Japan
| | - Akiyoshi Tani
- Pharmaceutical Research Division, Takeda Pharmaceutical Company Limited, 17-85, Jusohonmachi 2-Chome, Yodogawa-ku, Osaka 532-8686, Japan
| | - Masako Sasaki
- Pharmaceutical Research Division, Takeda Pharmaceutical Company Limited, 17-85, Jusohonmachi 2-Chome, Yodogawa-ku, Osaka 532-8686, Japan
| | - Miyuki Funami
- Pharmaceutical Research Division, Takeda Pharmaceutical Company Limited, 17-85, Jusohonmachi 2-Chome, Yodogawa-ku, Osaka 532-8686, Japan
| | - Michiko Amano
- Pharmaceutical Research Division, Takeda Pharmaceutical Company Limited, 17-85, Jusohonmachi 2-Chome, Yodogawa-ku, Osaka 532-8686, Japan
| | - Yoshio Yamamoto
- Pharmaceutical Research Division, Takeda Pharmaceutical Company Limited, 17-85, Jusohonmachi 2-Chome, Yodogawa-ku, Osaka 532-8686, Japan
| | - Kathleen Aertgeerts
- Takeda San Diego, Inc., 10410, Science Center Drive, San Diego, California 92121, United States
| | - Jason Yano
- Takeda San Diego, Inc., 10410, Science Center Drive, San Diego, California 92121, United States
| | - Hironobu Maezaki
- Pharmaceutical Research Division, Takeda Pharmaceutical Company Limited, 17-85, Jusohonmachi 2-Chome, Yodogawa-ku, Osaka 532-8686, Japan
| |
Collapse
|
22
|
Miyamoto Y, Banno Y, Yamashita T, Fujimoto T, Oi S, Moritoh Y, Asakawa T, Kataoka O, Takeuchi K, Suzuki N, Ikedo K, Kosaka T, Tsubotani S, Tani A, Funami M, Amano M, Yamamoto Y, Aertgeerts K, Yano J, Maezaki H. Design and synthesis of 3-pyridylacetamide derivatives as dipeptidyl peptidase IV (DPP-4) inhibitors targeting a bidentate interaction with Arg125. Bioorg Med Chem 2011; 19:172-85. [DOI: 10.1016/j.bmc.2010.11.038] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2010] [Revised: 11/16/2010] [Accepted: 11/16/2010] [Indexed: 11/17/2022]
|
23
|
Miyazaki S, Taniguchi H, Moritoh Y, Tashiro F, Yamamoto T, Yamato E, Ikegami H, Ozato K, Miyazaki JI. Nuclear hormone retinoid X receptor (RXR) negatively regulates the glucose-stimulated insulin secretion of pancreatic ß-cells. Diabetes 2010; 59:2854-61. [PMID: 20798333 PMCID: PMC2963544 DOI: 10.2337/db09-1897] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
OBJECTIVE Retinoid X receptors (RXRs) are members of the nuclear hormone receptor superfamily and are thought to be key regulators in differentiation, cellular growth, and gene expression. Although several experiments using pancreatic β-cell lines have shown that the ligands of nuclear hormone receptors modulate insulin secretion, it is not clear whether RXRs have any role in insulin secretion. RESEARCH DESIGN AND METHODS To elucidate the function of RXRs in pancreatic β-cells, we generated a double-transgenic mouse in which a dominant-negative form of RXRβ was inducibly expressed in pancreatic β-cells using the Tet-On system. We also established a pancreatic β-cell line from an insulinoma caused by the β-cell-specific expression of simian virus 40 T antigen in the above transgenic mouse. RESULTS In the transgenic mouse, expression of the dominant-negative RXR enhanced the insulin secretion with high glucose stimulation. In the pancreatic β-cell line, the suppression of RXRs also enhanced glucose-stimulated insulin secretion at a high glucose concentration, while 9-cis-retinoic acid, an RXR agonist, repressed it. High-density oligonucleotide microarray analysis showed that expression of the dominant-negative RXR affected the expression levels of a number of genes, some of which have been implicated in the function and/or differentiation of β-cells. CONCLUSIONS These results suggest that endogenous RXR negatively regulates the glucose-stimulated insulin secretion. Given these findings, we propose that the modulation of endogenous RXR in β-cells may be a new therapeutic approach for improving impaired insulin secretion in type 2 diabetes.
Collapse
Affiliation(s)
- Satsuki Miyazaki
- Division of Stem Cell Regulation Research, Osaka University Graduate School of Medicine, Osaka, Japan
| | - Hidenori Taniguchi
- Division of Stem Cell Regulation Research, Osaka University Graduate School of Medicine, Osaka, Japan
| | - Yusuke Moritoh
- Division of Stem Cell Regulation Research, Osaka University Graduate School of Medicine, Osaka, Japan
| | - Fumi Tashiro
- Division of Stem Cell Regulation Research, Osaka University Graduate School of Medicine, Osaka, Japan
| | - Tsunehiko Yamamoto
- Division of Stem Cell Regulation Research, Osaka University Graduate School of Medicine, Osaka, Japan
| | - Eiji Yamato
- Division of Stem Cell Regulation Research, Osaka University Graduate School of Medicine, Osaka, Japan
| | - Hiroshi Ikegami
- Department of Endocrinology, Metabolism and Diabetes, Kinki University School of Medicine, Osaka, Japan
| | - Keiko Ozato
- Section on Molecular Genetics of Immunity, Laboratory of Molecular Growth Regulation, National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, Maryland
| | - Jun-ichi Miyazaki
- Division of Stem Cell Regulation Research, Osaka University Graduate School of Medicine, Osaka, Japan
- Corresponding author: Jun-ichi Miyazaki,
| |
Collapse
|
24
|
De Marinis YZ, Salehi A, Ward CE, Zhang Q, Abdulkader F, Bengtsson M, Braha O, Braun M, Ramracheya R, Amisten S, Habib AM, Moritoh Y, Zhang E, Reimann F, Rosengren A, Shibasaki T, Gribble F, Renström E, Seino S, Eliasson L, Rorsman P. GLP-1 inhibits and adrenaline stimulates glucagon release by differential modulation of N- and L-type Ca2+ channel-dependent exocytosis. Cell Metab 2010; 11:543-553. [PMID: 20519125 PMCID: PMC4310935 DOI: 10.1016/j.cmet.2010.04.007] [Citation(s) in RCA: 200] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/08/2009] [Revised: 02/03/2010] [Accepted: 04/07/2010] [Indexed: 12/30/2022]
Abstract
Glucagon secretion is inhibited by glucagon-like peptide-1 (GLP-1) and stimulated by adrenaline. These opposing effects on glucagon secretion are mimicked by low (1-10 nM) and high (10 muM) concentrations of forskolin, respectively. The expression of GLP-1 receptors in alpha cells is <0.2% of that in beta cells. The GLP-1-induced suppression of glucagon secretion is PKA dependent, is glucose independent, and does not involve paracrine effects mediated by insulin or somatostatin. GLP-1 is without much effect on alpha cell electrical activity but selectively inhibits N-type Ca(2+) channels and exocytosis. Adrenaline stimulates alpha cell electrical activity, increases [Ca(2+)](i), enhances L-type Ca(2+) channel activity, and accelerates exocytosis. The stimulatory effect is partially PKA independent and reduced in Epac2-deficient islets. We propose that GLP-1 inhibits glucagon secretion by PKA-dependent inhibition of the N-type Ca(2+) channels via a small increase in intracellular cAMP ([cAMP](i)). Adrenaline stimulates L-type Ca(2+) channel-dependent exocytosis by activation of the low-affinity cAMP sensor Epac2 via a large increase in [cAMP](i).
Collapse
Affiliation(s)
- Yang Z De Marinis
- Lund University Diabetes Centre, Department of Clinical Sciences, Clinical Research Centre, Lund University, SE20502 Malmö, Sweden
| | - Albert Salehi
- Lund University Diabetes Centre, Department of Clinical Sciences, Clinical Research Centre, Lund University, SE20502 Malmö, Sweden
| | - Caroline E Ward
- Oxford Centre for Diabetes, Endocrinology and Metabolism, University of Oxford, Churchill Hospital, Oxford OX3 7LJ, UK
| | - Quan Zhang
- Oxford Centre for Diabetes, Endocrinology and Metabolism, University of Oxford, Churchill Hospital, Oxford OX3 7LJ, UK
| | - Fernando Abdulkader
- Oxford Centre for Diabetes, Endocrinology and Metabolism, University of Oxford, Churchill Hospital, Oxford OX3 7LJ, UK
- Department of Physiology and Biophysics, Institute of Biomedical Sciences, University of São Paulo, 05508-00 São Paulo, Brazil
| | - Martin Bengtsson
- Oxford Centre for Diabetes, Endocrinology and Metabolism, University of Oxford, Churchill Hospital, Oxford OX3 7LJ, UK
| | - Orit Braha
- Oxford Centre for Diabetes, Endocrinology and Metabolism, University of Oxford, Churchill Hospital, Oxford OX3 7LJ, UK
| | - Matthias Braun
- Oxford Centre for Diabetes, Endocrinology and Metabolism, University of Oxford, Churchill Hospital, Oxford OX3 7LJ, UK
| | - Reshma Ramracheya
- Oxford Centre for Diabetes, Endocrinology and Metabolism, University of Oxford, Churchill Hospital, Oxford OX3 7LJ, UK
| | - Stefan Amisten
- Oxford Centre for Diabetes, Endocrinology and Metabolism, University of Oxford, Churchill Hospital, Oxford OX3 7LJ, UK
| | - Abdella M Habib
- Cambridge Institute for Medical Research, Addenbrooke’s Hospital, University of Cambridge, Cambridge CB2 0XY, UK
| | - Yusuke Moritoh
- Oxford Centre for Diabetes, Endocrinology and Metabolism, University of Oxford, Churchill Hospital, Oxford OX3 7LJ, UK
| | - Enming Zhang
- Lund University Diabetes Centre, Department of Clinical Sciences, Clinical Research Centre, Lund University, SE20502 Malmö, Sweden
| | - Frank Reimann
- Cambridge Institute for Medical Research, Addenbrooke’s Hospital, University of Cambridge, Cambridge CB2 0XY, UK
| | - Anders Rosengren
- Lund University Diabetes Centre, Department of Clinical Sciences, Clinical Research Centre, Lund University, SE20502 Malmö, Sweden
| | - Tadao Shibasaki
- Division of Cellular and Molecular Medicine, Department of Physiology and Cell Biology, Kobe University Graduate School of Medicine, 7-5-1 Kusunoki-cho, Chuo-ku, Kobe, Hyogo 650-0017, Japan
| | - Fiona Gribble
- Cambridge Institute for Medical Research, Addenbrooke’s Hospital, University of Cambridge, Cambridge CB2 0XY, UK
| | - Erik Renström
- Lund University Diabetes Centre, Department of Clinical Sciences, Clinical Research Centre, Lund University, SE20502 Malmö, Sweden
| | - Susumu Seino
- Division of Cellular and Molecular Medicine, Department of Physiology and Cell Biology, Kobe University Graduate School of Medicine, 7-5-1 Kusunoki-cho, Chuo-ku, Kobe, Hyogo 650-0017, Japan
| | - Lena Eliasson
- Lund University Diabetes Centre, Department of Clinical Sciences, Clinical Research Centre, Lund University, SE20502 Malmö, Sweden
| | - Patrik Rorsman
- Oxford Centre for Diabetes, Endocrinology and Metabolism, University of Oxford, Churchill Hospital, Oxford OX3 7LJ, UK
| |
Collapse
|
25
|
Moritoh Y, Takeuchi K, Hazama M. Combination treatment with alogliptin and voglibose increases active GLP-1 circulation, prevents the development of diabetes and preserves pancreatic beta-cells in prediabetic db/db mice. Diabetes Obes Metab 2010; 12:224-33. [PMID: 20151999 DOI: 10.1111/j.1463-1326.2009.01156.x] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
AIM Alogliptin, a dipeptidyl peptidase-4 (DPP-4) inhibitor, and voglibose, an alpha-glucosidase inhibitor, have different but complementary mechanisms of action on glucagon-like peptide-1 (GLP-1) regulation and glucose-lowering effects. The present study evaluated the chronic effects of combination treatment with alogliptin and voglibose in prediabetic db/db mice. METHODS Alogliptin (0.03%) and voglibose (0.001%) alone or in combination were administered in the diet to prediabetic db/db mice. RESULTS After 3 weeks, voglibose treatment increased GLP-1 secretion (voglibose alone, 1.6-fold; alogliptin plus voglibose, 1.5-fold), while it decreased plasma glucose-dependent insulinotropic polypeptide (GIP) (voglibose alone, -30%; alogliptin plus voglibose, -29%). Alogliptin, voglibose and combination treatment decreased plasma DPP-4 activity by 72, 15 and additively by 80%, respectively, and increased plasma active GLP-1 levels by 4.5-, 1.8- and synergistically by 9.1-fold respectively. Combination treatment increased plasma insulin by 3.6-fold (alogliptin alone, 1.3-fold; voglibose alone, 1.8-fold), decreased plasma glucagon by 30% (alogliptin alone, 11%; voglibose alone, 8%), and prevented the development of diabetes, much more effectively than either agent alone. After 4 weeks, alogliptin, voglibose and combination treatment increased pancreatic insulin content by 1.6-, 3.4- and synergistically by 8.5-fold respectively. Furthermore, combination treatment resulted in an increased expression of insulin, pancreatic and duodenal homeobox 1 (PDX1) and glucose transporter 2 (GLUT2), and maintenance of normal beta/alpha-cell distribution in the pancreatic islet. CONCLUSIONS Chronic treatment with alogliptin in combination with voglibose concurrently increased active GLP-1 circulation, increased insulin secretion, decreased glucagon secretion, prevented the onset of the disease, and preserved pancreatic beta-cells and islet structure in prediabetic db/db mice.
Collapse
Affiliation(s)
- Y Moritoh
- Pharmacology Research Laboratories, Pharmaceutical Research Division, Takeda Pharmaceutical Company Limited, Osaka, Japan.
| | | | | |
Collapse
|
26
|
Braun M, Ramracheya R, Amisten S, Bengtsson M, Moritoh Y, Zhang Q, Johnson PR, Rorsman P. Somatostatin release, electrical activity, membrane currents and exocytosis in human pancreatic delta cells. Diabetologia 2009; 52:1566-78. [PMID: 19440689 DOI: 10.1007/s00125-009-1382-z] [Citation(s) in RCA: 76] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/16/2008] [Accepted: 04/09/2009] [Indexed: 01/24/2023]
Abstract
AIMS/HYPOTHESIS The aim of this study was to characterise electrical activity, ion channels, exocytosis and somatostatin release in human delta cells/pancreatic islets. METHODS Glucose-stimulated somatostatin release was measured from intact human islets. Membrane potential, currents and changes in membrane capacitance (reflecting exocytosis) were recorded from individual human delta cells identified by immunocytochemistry. RESULTS Somatostatin secretion from human islets was stimulated by glucose and tolbutamide and inhibited by diazoxide. Human delta cells generated bursting or sporadic electrical activity, which was enhanced by tolbutamide but unaffected by glucose. Delta cells contained a tolbutamide-insensitive, Ba(2+)-sensitive inwardly rectifying K(+) current and two types of voltage-gated K(+) currents, sensitive to tetraethylammonium/stromatoxin (delayed rectifying, Kv2.1/2.2) and 4-aminopyridine (A current). Voltage-gated tetrodotoxin (TTX)-sensitive Na(+) currents contributed to the action potential upstroke but TTX had no effect on somatostatin release. Delta cells are equipped with Ca(2+) channels blocked by isradipine (L), omega-agatoxin (P/Q) and NNC 55-0396 (T). Blockade of any of these channels interferes with delta cell electrical activity and abolishes glucose-stimulated somatostatin release. Capacitance measurements revealed a slow component of depolarisation-evoked exocytosis sensitive to omega-agatoxin. CONCLUSIONS/INTERPRETATION Action potential firing in delta cells is modulated by ATP-sensitive K(+)-channel activity. The membrane potential is stabilised by Ba(2+)-sensitive inwardly rectifying K(+) channels. Voltage-gated L- and T-type Ca(2+) channels are required for electrical activity, whereas Na(+) currents and P/Q-type Ca(2+) channels contribute to (but are not necessary for) the upstroke of the action potential. Action potential repolarisation is mediated by A-type and Kv2.1/2.2 K(+) channels. Exocytosis is tightly linked to Ca(2+)-influx via P/Q-type Ca(2+) channels. Glucose stimulation of somatostatin secretion involves both K(ATP) channel-dependent and -independent processes.
Collapse
Affiliation(s)
- M Braun
- Oxford Centre for Diabetes, Endocrinology and Metabolism, Churchill Hospital, Oxford OX37 LJ, UK.
| | | | | | | | | | | | | | | |
Collapse
|
27
|
Asakawa T, Moritoh Y, Kataoka O, Suzuki N, Takeuchi K, Odaka H. A novel dipeptidyl peptidase-4 inhibitor, alogliptin (SYR-322), is effective in diabetic rats with sulfonylurea-induced secondary failure. Life Sci 2009; 85:122-6. [PMID: 19427871 DOI: 10.1016/j.lfs.2009.04.024] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2009] [Revised: 03/30/2009] [Accepted: 04/30/2009] [Indexed: 01/07/2023]
Abstract
AIMS Loss of efficacy over time or secondary failure occurs somewhat often and remains a major concern of sulfonylurea (SU) therapy. In this study, we investigated the benefits of alogliptin, an oral, potent and highly selective dipeptidyl peptidase-4 (DPP-4) inhibitor, in a rat model exhibiting SU secondary failure. MAIN METHODS Neonatally streptozotocin-induced diabetic rats (N-STZ-1.5 rats), a non-obese model of type 2 diabetes, were used in these studies. The effects of alogliptin on DPP-4 activity and glucagon-like peptide 1 (GLP-1) concentration were determined by measuring their levels in plasma. In addition, the effects of alogliptin on an oral glucose tolerance test were investigated by using an SU secondary failure model. KEY FINDINGS Alogliptin dose dependently suppressed plasma DPP-4 activity leading to an increase in the plasma active form of GLP-1 and improved glucose excursion in N-STZ-1.5 rats. Repeated administration of glibenclamide resulted in unresponsiveness or loss of glucose tolerance typical of secondary failure. In these rats, alogliptin exhibited significant improvement of glucose excursion with significant increase in insulin secretion. By contrast, glibenclamide and nateglinide had no effect on the glucose tolerance of these rats. SIGNIFICANCE The above findings suggest that alogliptin was effective at improving glucose tolerance and therefore overcoming SU induced secondary failure in N-STZ-1.5 rats.
Collapse
Affiliation(s)
- Tomoko Asakawa
- Pharmaceutical Research Laboratories I, Pharmaceutical Research Division, Takeda Pharmaceutical Company LTD., Osaka, Japan.
| | | | | | | | | | | |
Collapse
|
28
|
Moritoh Y, Takeuchi K, Asakawa T, Kataoka O, Odaka H. Combining a dipeptidyl peptidase-4 inhibitor, alogliptin, with pioglitazone improves glycaemic control, lipid profiles and beta-cell function in db/db mice. Br J Pharmacol 2009; 157:415-26. [PMID: 19371350 DOI: 10.1111/j.1476-5381.2009.00145.x] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
BACKGROUND AND PURPOSE Alogliptin, a highly selective dipeptidyl peptidase-4 (DPP-4) inhibitor, enhances incretin action and pioglitazone enhances hepatic and peripheral insulin actions. Here, we have evaluated the effects of combining these agents in diabetic mice. EXPERIMENTAL APPROACH Effects of short-term treatment with alogliptin alone (0.01%-0.1% in diet), and chronic combination treatment with alogliptin (0.03% in diet) and pioglitazone (0.0075% in diet) were evaluated in db/db mice exhibiting early stages of diabetes. KEY RESULTS Alogliptin inhibited plasma DPP-4 activity up to 84% and increased plasma active glucagon-like peptide-1 by 4.4- to 4.9-fold. Unexpectedly, alogliptin alone lacked clear efficacy for improving glucose levels. However, alogliptin in combination with pioglitazone clearly enhanced the effects of pioglitazone alone. After 3-4 weeks of treatment, combination treatment increased plasma insulin by 3.8-fold, decreased plasma glucagon by 41%, both of which were greater than each drug alone, and increased plasma adiponectin by 2.4-fold. In addition, combination treatment decreased glycosylated haemoglobin by 2.2%, plasma glucose by 52%, plasma triglycerides by 77% and non-esterified fatty acids by 48%, all of which were greater than each drug alone. Combination treatment also increased expression of insulin and pancreatic and duodenal homeobox 1 (PDX1), maintained normal beta-cell/alpha-cell distribution in islets and restored pancreatic insulin content to levels comparable to non-diabetic mice. CONCLUSIONS AND IMPLICATIONS These results indicate that combination treatment with alogliptin and pioglitazone at an early stage of diabetes improved metabolic profiles and indices that measure beta-cell function, and maintained islet structure in db/db mice, compared with either alogliptin or pioglitazone monotherapy.
Collapse
Affiliation(s)
- Y Moritoh
- Pharmacology Research Laboratories I, Pharmaceutical Research Division, Takeda Pharmaceutical Company Limited, Osaka 532-8686, Japan
| | | | | | | | | |
Collapse
|
29
|
Moritoh Y, Takeuchi K, Hazama M. Chronic administration of voglibose, an alpha-glucosidase inhibitor, increases active glucagon-like peptide-1 levels by increasing its secretion and decreasing dipeptidyl peptidase-4 activity in ob/ob mice. J Pharmacol Exp Ther 2009; 329:669-76. [PMID: 19208898 DOI: 10.1124/jpet.108.148056] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Administration of an alpha-glucosidase inhibitor, voglibose, increases the secretion of glucagon-like peptide (GLP)-1, a key modulator of pancreatic islet hormone secretion and glucose homeostasis. In the present study, novel mechanisms by which voglibose increases active GLP-1 circulation were evaluated. Voglibose (0.001 and 0.005%) was administered in the diet to ob/ob mice for 1 day or 3 to 4 weeks to determine effects on incretin profiles and plasma activity of dipeptidyl peptidase-4 (DPP-4), an enzyme responsible for GLP-1 degradation. Voglibose showed no direct inhibitory effect against DPP-4 in vitro (DPP-4 inhibitor alogliptin, IC(50) < 10 nM). Likewise, 1-day treatment with voglibose did not change plasma DPP-4 activity; however, it increased plasma active GLP-1 by 1.6- to 3.4-fold. After chronic treatment, voglibose stimulated GLP-1 secretion, as evidenced by the 1.3- to 1.5-fold increase in plasma active plus inactive amidated GLP-1 levels. Plasma DPP-4 activity was decreased unexpectedly by 40 to 51%, resulting from reduced plasma DPP-4 concentrations in voglibose-treated mice. Voglibose increased GLP-1 content by 1.5- to 1.6-fold and 1.4- to 1.6-fold in the lower intestine and colon, respectively. The increased GLP-1 content in the colon was associated with elevated expression of gut glucagon gene. Chronic treatment with voglibose resulted in 1.9- to 4.1-fold increase in active GLP-1 circulation, which was higher than 1-day treatment. A similar treatment with pioglitazone (0.03%), an insulin sensitizer, did not affect plasma DPP-4 activity or GLP-1 levels. These results suggest that increased GLP-1 secretion, decreased DPP-4 activity, and increased gut GLP-1 content may have contributed to increased active GLP-1 circulation after chronic treatment with voglibose in a glucose control-independent manner in ob/ob mice.
Collapse
Affiliation(s)
- Yusuke Moritoh
- Pharmacology Research Laboratories I, Pharmaceutical Research Division, Takeda Pharmaceutical Company Limited, Yodogawa-ku, Osaka, Japan.
| | | | | |
Collapse
|
30
|
Moritoh Y, Takeuchi K, Asakawa T, Kataoka O, Odaka H. The dipeptidyl peptidase-4 inhibitor alogliptin in combination with pioglitazone improves glycemic control, lipid profiles, and increases pancreatic insulin content in ob/ob mice. Eur J Pharmacol 2008; 602:448-54. [PMID: 19038243 DOI: 10.1016/j.ejphar.2008.11.017] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2008] [Revised: 10/22/2008] [Accepted: 11/10/2008] [Indexed: 02/08/2023]
Abstract
The combination of two agents with different but complementary mechanisms of action is a logical approach for treating patients with type 2 diabetes. Thus, we evaluated chronic combination therapy with alogliptin, a highly selective dipeptidyl peptidase-4 inhibitor that enhances the action of incretins, and pioglitazone, a thiazolidinedione that improves peripheral and hepatic insulin sensitivity. Studies were designed to investigate the chronic metabolic and pancreatic effects of alogliptin (0.03%) plus pioglitazone (0.003%) combination treatment in obese ob/ob mice. After 4-5 weeks of treatment, alogliptin significantly increased plasma active glucagon-like peptide-1 levels up to 4.1-fold and decreased plasma glucagon up to 25%, whereas pioglitazone significantly increased plasma adiponectin up to 1.3-fold. Combination treatment exhibited a complementary effect, increasing plasma insulin levels by 3.2-fold (alogliptin alone, 1.6-fold; pioglitazone alone, 1.5-fold) and decreasing glycosylated hemoglobin by 2.3% (alogliptin alone, 1.0%; pioglitazone alone, 1.5%), and non-fasting and fasting plasma glucose by 37% and 62% (alogliptin alone, 17% and 24%; pioglitazone alone, 30% and 45%), respectively. Combination treatment also decreased plasma triglycerides by 67% and non-esterified fatty acids by 25% (alogliptin alone, 24% and 11%; pioglitazone alone, 54% and 8%). Moreover, combination treatment increased pancreatic insulin content by 2.2-fold (alogliptin alone, 1.3-fold; pioglitazone alone, 1.6-fold), with no significant changes in body weight. These results indicate that combination treatment with alogliptin and pioglitazone improved glycemic control, lipid profiles and increased pancreatic insulin content in ob/ob mice by preventing incretin inactivation and improving insulin resistance. These results provide a strong argument for using alogliptin in combination with pioglitazone.
Collapse
Affiliation(s)
- Yusuke Moritoh
- Pharmacology Research Laboratories I, Pharmaceutical Research Division, Takeda Pharmaceutical Company Limited, Osaka, Japan
| | | | | | | | | |
Collapse
|
31
|
Tanaka Y, Moritoh Y, Miwa N. Age-dependent telomere-shortening is repressed by phosphorylated α-tocopherol together with cellular longevity and intracellular oxidative-stress reduction in human brain microvascular endotheliocytes. J Cell Biochem 2007; 102:689-703. [PMID: 17407150 DOI: 10.1002/jcb.21322] [Citation(s) in RCA: 58] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Cellular life-span of neonatal human brain microvascular endotheliocytes (HBME) was estimated by population doubling levels (PDLs) for serial subcultivations until spontaneous proliferation stoppage, and was 2.4-fold longer for continuous administration with the 6-O-phosphorylated derivative (TocP) of alpha-tocopherol (Toc), being bio-available owing to its water-solubility, or TocP plus 2-O-phosphorylated ascorbate (Asc2P), and 1.3-fold longer with Asc2P, at a dose of 150 microM, than for the non-administered control. Enlarged cell diameters indicative of cellular aging were repressed for TocP-administered cells as analyzed with a channelizer. Age-dependent shortening of telomeric DNA length (291 bp/PDL) was slowed markedly for TocP (165 bp/PDL) or TocP plus Asc2P, but slightly for Asc2P. Telomerase activity as assessed by the PCR-based TRAP method was detectable slightly at younger ages but no longer at middle ages for the non-administered cells, but, for TocP-administered cells, was intensely detected at younger ages and appreciably until middle ages. Intracellular TocP amounts were not changed age-dependently in contrast to a marked decrease in Toc which accrued from TocP esterolysis. This may be partly attributed to age-dependent changes in the lipid peroxidation product acrolein (ACR), which was abundant at older ages in non-administered cells, but scarcely in TocP-administered cells. Furthermore, intracellular reactive oxygen species (ROS) such as H(2)O(2) and hydroperoxides as detected using the redox indicator CDCFH-DA was less abundant in TocP-administered cells than in non-administered cells. Thus the telomeric-DNA retention, concurrently with retained telomerase activity, was shown to be correlated with cellular longevity, and may be supported by diminished oxidative stress, in hydrophobic microenvironment, which can be achieved by TocP rather than AscP.
Collapse
Affiliation(s)
- Yasufumi Tanaka
- Laboratory of Cell-Death Control BioTechnology, Faculty of Life and Environmental Sciences, Prefectural University of Hiroshima, Nanatsuka, Shobara, Hiroshima 727-0023, Japan
| | | | | |
Collapse
|
32
|
Abstract
Embryonic stem (ES) cells can differentiate into many cell types and are expected to be useful for tissue engineering. Recent reports have shown that ES cells can differentiate into insulin-producing cells in response to the transient expression of the pdx-1 gene, after the removal of feeder cells. To investigate the lineage of insulin-producing cells and their in vitro differentiation, we introduced the betageo gene, encoding a beta-galactosidase-neomycin phosphotransferase fusion protein under the control of the mouse insulin 2 promoter, into ES cells that had been adapted to feeder-free culture, and analyzed insulin gene expression during their in vitro differentiation. We also examined the expression of transcription factors that are related to the differentiation of the pancreas. X-gal staining analysis revealed beta-galactosidase-positive cells on the surface and in the center of the embryoid body that proliferated during differentiation. Glucose-responsive insulin-producing cells, derived from our feeder-free ES cells, expressed insulin 2, pdx-1, Pax4, and Isl1 and also the glucagon, somatostatin, and PP genes. Moreover, the genes encoding p48, amylase, and carboxypeptidase A were also expressed. These results suggest that ES cells can differentiate not only into endocrine cells but also into exocrine cells of the pancreas, without the initiation of pdx-1 expression.
Collapse
Affiliation(s)
- Yusuke Moritoh
- Division of Stem Cell Regulation Research, Osaka University Graduate School of Medicine, 2-2 Yamadaoka, Suita, Osaka 565-0871, Japan
| | | | | | | | | |
Collapse
|