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The Role of Nateglinide and Repaglinide, Derivatives of Meglitinide, in the Treatment of Type 2 Diabetes Mellitus

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The Role of Nateglinide and Repaglinide, Derivatives of Meglitinide, in the Treatment of Type 2 Diabetes Mellitus State of the art paper The role of nateglinide and repaglinide, derivatives of meglitinide, in the treatment of type 2 diabetes mellitus Rodolfo Guardado-Mendoza 1, Annamaria Prioletta 2 , Lilia M. Jiménez-Ceja 1, Aravind Sosale 3, Franco Folli 4 1Department of Medicine and Nutrition, Division of Health Sciences, University Corresponding author: of Guanajuato, México Franco Folli MD, PhD 2Diabetes Center, ACISMOM Associazione Cavalieri Italiani Sovrano Militare Ordine University of Texas Health Di Malta, Italy Science Center 3Diacon Hospital, Bangalore, India Department of Medicine 4Department of Medicine, Diabetes Division, University of Texas Health Science Center Diabetes Division at San Antonio, Texas, USA Mail Stop 7886–7703 Floyd Curl Drive-San Antonio Submitted: 13 November 2012 TX 78229-3900, USA Accepted: 31 January 2013 Phone: 210-567-4826. E-mail: [email protected] Arch Med Sci 2013; 9, 5: 936–943 DOI: 10.5114/aoms.2013.34991 Copyright © 2013 Termedia & Banach Abstract Type 2 diabetes mellitus (T2DM) is one of the most common chronic diseases worldwide, presenting a great challenge to the public health systems due to high morbidity and mortality, because of frequent micro-/macro-vascular com - plications. Many treatment options are now available, with different efficacy as well as mechanisms of action to improve deranged glucose metabolism. We review some of the available data on derivatives of meglitinide, namely nateglin - ide and repaglinide. These two compounds increase insulin secretion by a mech - anism similar to the one of sulfonylureas, but with a shorter half-life. Nateglinide and repaglinide, derivatives of meglitinides, have characteristic pharmacody - namic and pharmacokinetic properties that, together with their proposed mech - anism of action, make them useful for type 2 diabetes mellitus, especially when used in combination therapy. Key words: meglitinide, repaglinide, nateglinide, glycemic control, post-prandial glucose excursion, hypoglycemia. Data sources We performed a systematic Medline search (from September 2012 to December 1994), using the following search terms: • “meglitinide analogues” and/or “nateglinide” or “repaglinide”, • “repaglinide and sulfonylureas”, • “nateglinide and sulfonylureas”. Eighty-two papers considered relevant for the aim of this review were selected by the authors. When previous systematic reviews were incor - porated, we independently examined the individual studies to confirm or extend previous reviews’ findings. Chemical and pharmacodynamic properties The meglitinide analogues are insulinotropic agents, introduced in 1995 and approved for clinical use in adults with type 2 diabetes mellitus (T2DM) in 2000. They are secretagogue molecules with a more rapid anti-hyper - glycemic action and a shorter duration than sulfonylureas, thus providing The role of nateglinide and repaglinide, derivatives of meglitinide, in the treatment of type 2 diabetes mellitus better control of post-prandial hyperglycemia and shows a greater degree of specificity for SUR1 over reducing the risk of late hypoglycemia [1, 2]. SUR2, as compared with glibenclamide and re- paglinide. Also, the half-life of nateglinide on the Repaglinide receptor is approximately 2 s, much shorter when compared to that of repaglinide, which is ~3 min. Repaglinide was the first meglitinide analogue In addition, the dissociation from the receptor is approved for clinical use in adults with T2DM. estimated to be 90 times faster than that of Repaglinide is the S(+) enantiomer of 2-ethoxy- repaglinide, indicating a very short on-off effect of 4-(2-((3-methyl-1-(2-(1-piperidinyl) phenyl)-butyl) nateglinide on insulin release [8]. amino)-2-oxoethyl) benzoic acid with a molecular Foley et al. have demonstrated a sort of “glucose- weight of 452.6 Da. sensitizing property” of nateglinide in in vitro exper - The mechanism of action is similar to sulfony - iments on rat cells. In fact, unlike glibenclamide lureas, but repaglinide exhibits distinct pharmaco - β and repaglinide, the potency of nateglinide increas - logical properties in structure, binding profile, dura - es in the presence of glucose. The inhibition of KATP tion of action and mechanisms of excretion [3]. current is enhanced 16-fold when the glucose con - Like the sulfonylureas, the insulinotropic action centration is raised from 3 mmol/l to 16 mmol/l. of repaglinide is mediated via adenosine triphosphate Interestingly, the glibenclamide potency is much (ATP)-dependent potassium channels. Re paglinide reduced under these conditions, whereas the poten - stimulates insulin secretion by blocking ATP-depen - cy of repaglinide is enhanced 4-fold only, which dent potassium channels (KATP) of the pancreatic could explain the low incidence of hypoglycemia [8]. -cell, where inhibition of KATP channels results in β Moreover, pharmacodynamic studies in patients membrane depolarization and calcium influx through with T2DM have demonstrated that the adminis - voltage-gated calcium channels. These events lead tration of nateglinide (prior to meals) induces ear - to an increase in intracellular calcium and subse - ly phase insulin secretion and significantly reduces quent exocytosis of insulin-containing granules. post-prandial hyperglycemia in a dose-dependent The KATP channel is a hetero-octameric complex manner. Interestingly, insulin secretion was signif - of two different types of protein subunits: an in - icantly greater when nateglinide was taken before wardly rectifying K+ channel (KIR) subunit 6.x and a meal compared to nateglinide given in the fast - a sulfonylurea receptor (SUR). More than one iso - ed state or in response to just the meal [9]. form exists for both Kir6.x (Kir6.1, Kir6.2) and SUR (SUR1, SUR2A, SUR2B). Distinct isoforms and splice Pharmacokinetic properties variants of the SUR subunit are expressed in dif - ferent tissues and confer many of the pharmaco - Repaglinide logical properties to the KATP channel hetero-octamer. Repaglinide is rapidly absorbed after oral admin - The subunits that are predominantly expressed in istration. The peak plasma concentration is reached pancreatic -cells are Kir6.2 and SUR1 [4]. β 30-60 min after administration, plasma levels de - Repaglinide binds to the sulfonylurea receptor crease rapidly and the drug is eliminated within SUR1 and it seems to have also a separate distinct 4-6 h. Its absorption is not affected by food, the binding site on cells, as demonstrated in mouse β bioavailability is 63% and the half-life is ~1 h [10]. cells co-incubated with PPP (3-(3 hydroxyphenyl)- β Repaglinide has a small volume of distribution N-(1-propyl) piperidine), a pharmacological tool to and is highly bound (more than 98%) to plasma differentiate between the two different binding albumin. Repaglinide is metabolized by the liver sites [5]. Moreover, molecular studies have shown cytochrome P450 (CYP3A4) and eliminated rapidly that the binding site of repaglinide is different from throughout the biliary tract, without apparent accu - that of glibenclamide and nateglinide [6]. mulation in the plasma after a multiple dose [11]. Around 90% of the metabolites are excreted Nateglinide throughout the bile and only 8% can be traced in Nateglinide is a (N-[(trans-4-iso propylcyclohe - the urine. Only 2% of repaglinide is eliminated as xyl)-carbonyl]-D-phenylalanine A-4166) phenylala - unchanged and its metabolites are not biological - nine derivative. Like repaglinide, also nateglinide ly active and they do not have a blood glucose low - binds competitively to SURs, inhibiting KATP chan - ering effect. nels and stimulating insulin secretion, but the phar - In vitro studies have shown that substances which macodynamic properties of this molecule are inhibit the enzyme CYP3A4, such as ketoconazole, unique in several aspects [7]. anti-bacterial agents, steroids and cyclosporine, may Comparative preclinical studies in vitro indicate reduce metabolism and increase repaglinide con - that nateglinide inhibits KATP channels more rap - centration, while drugs which induce CYP3A4, such idly, and with a shorter duration of action, than as rifampicin, carbamazepine, and barbiturates, may glibenclamide, glimepiride and repaglinide, and accelerate repaglinide metabolism [11]. Arch Med Sci 5, October / 2013 937 Rodolfo Guardado-Mendoza, Annamaria Prioletta, Lilia M. Jiménez-Ceja, Aravind Sosale, Franco Folli Nateglinide secretion after meal ingestion and reduce post- prandial hyperglycemia [2]. Clinical trials of nateglin - Nat eglinide is rapidly absorbed after oral admin - ide and repaglinide have shown efficacy and safe - istration from the gastrointestinal tract in a dose- ty as monotherapy and in combination therapy in dependent manner and the bioavailability of the patients with T2DM. drug is approximately 72% [12]. The optimal time of The short-acting insulin secretagogues are well oral administration of nateglinide is before the meal; suited for patients with T2DM who would like to in fact absorption is more rapid when the drug is have a more flexible lifestyle and who have prob - administered 0-30 min before meals [13]. Peak plas - lems adhering to more rigid therapeutic regimes. ma concentrations are achieved within 1 h and the In fact, administering short-acting insulin secreta - half-life is 1.8 h because it is rapidly eliminated from gogues immediately prior to meals increases plasma. This short elimination half-life ensures no patient compliance and flexibility in calorie intake drug accumulation at any dose level. Nateglinide is and
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