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Acarbose

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Acarbose
Haworth projection of acarbose
Ball-and-stick model of the acarbose molecule
Clinical data
Trade namesGlucobay, Precose, Prandase
Other names(2R,3R,4R,5S,6R)-5-{[(2R,3R,4R,5S,6R)-5- {[(2R,3R,4S,5S,6R)-3,4-dihydroxy-6-methyl- 5-{[(1S,4R,5S,6S)-4,5,6-trihydroxy-3- (hydroxymethyl)cyclohex-2-en-1-yl]amino} tetrahydro-2H-pyran-2-yl]oxy}-3,4-dihydroxy- 6-(hydroxymethyl)tetrahydro-2H-pyran-2-yl]oxy}- 6-(hydroxymethyl)tetrahydro-2H-pyran-2,3,4-triol
AHFS/Drugs.comMonograph
MedlinePlusa696015
License data
Pregnancy
category
  • AU: B3
Routes of
administration		By mouth
ATC code
Legal status
Legal status
Pharmacokinetic data
BioavailabilityExtremely low
MetabolismGastrointestinal tract
Elimination half-life2 hours
ExcretionKidney (less than 2%)
Identifiers
  • O-4,6-Dideoxy-4-[[(1S,4R,5S,6S)-4,5,6-trihydroxy-3-(hydroxymethyl)-2-cyclohexen-1-yl]amino]-α-D-glucopyranosyl-(1→4)-O-α-D-glucopyranosyl-(1→4)-D-glucopyranose
CAS Number
PubChem CID
IUPHAR/BPS
DrugBank
ChemSpider
UNII
KEGG
ChEMBL
CompTox Dashboard (EPA)
ECHA InfoCard100.054.555 Edit this at Wikidata
Chemical and physical data
FormulaC25H43NO18
Molar mass645.608 g·mol−1
3D model (JSmol)
  • O([C@H]1[C@H](O)[C@@H](O)[C@H](O)O[C@@H]1CO)[C@H]4O[C@@H]([C@@H](O[C@H]3O[C@H](C)[C@@H](N[C@H]2/C=C(/CO)[C@@H](O)[C@H](O)[C@H]2O)[C@H](O)[C@H]3O)[C@H](O)[C@H]4O)CO
  • InChI=1S/C25H43NO18/c1-6-11(26-8-2-7(3-27)12(30)15(33)13(8)31)14(32)19(37)24(40-6)43-22-10(5-29)42-25(20(38)17(22)35)44-21-9(4-28)41-23(39)18(36)16(21)34/h2,6,8-39H,3-5H2,1H3/t6-,8+,9-,10-,11-,12-,13+,14+,15+,16-,17-,18-,19-,20-,21-,22-,23-,24-,25-/m1/s1 checkY
  • Key:XUFXOAAUWZOOIT-SXARVLRPSA-N checkY
  (verify)

Acarbose (INN)[1][2] is an anti-diabetic drug used to treat diabetes mellitus type 2 and, in some countries, prediabetes. It is a generic sold in Europe and China as Glucobay (Bayer AG), in North America as Precose (Bayer Pharmaceuticals), and in Canada as Prandase (Bayer AG).

Acarbose is a starch blocker acting similarly to some raw herbs like cinnamon.[3] It works by inhibiting alpha glucosidase, an intestinal enzyme that releases glucose from larger carbohydrates such as starch and sucrose. It is composed of an acarviosin moiety with a maltose at the reducing terminus. It can be degraded by a number of gut bacteria.[4]

The intake of a single dose before a meal containing complex carbohydrates clearly suppresses the glucose spike and may decrease the postprandial hyperglycemia (higher than 140 mg/dL; >7.8 mmol/L) in patients with type II diabetes.[3]

Acarbose is cheap and popular in China, but not in the U.S. One physician explains that use in the U.S. is limited because it is not potent enough to justify the side effects of diarrhea and flatulence.[5] However, a large study concluded in 2013 that "acarbose is effective, safe and well tolerated in a large cohort of Asian patients with type 2 diabetes."[6] A possible explanation for the differing opinions is an observation that acarbose is significantly more effective in patients eating a relatively high-starch Eastern diet.[7]

Medical uses

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Dosing

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Since acarbose prevents the digestion of complex carbohydrates, the drug should be taken at the start of main meals (taken with first bite of meal).[8][9]

Formulation

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The benefits of alpha-glucosidase and alpha-amylase inhibitors on health were shown to be stronger when the powder is consumed orally dissolved in water as a beverage in comparison to its intake as ordinary hard gelatin capsules[9].

Efficacy

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In type II diabetic patients, acarbose averages an absolute decrease of 0.8 percentage points in HbA1c, which is a decrease of about 10% in typical HbA1c values in diabetes studies.[10] Individuals with higher baseline levels show higher reductions, about an 0.12% additional decrease for each point of baseline HbA1c.[10] Its effect on postprandial glucose, but not on HbA1c, scales with dose.[10] Among diabetic patients, acarbose may help reduce the damage done to blood vessels and kidneys by reducing glucose levels.[10]

A Cochrane systematic review assessed the effect of alpha-glucosidase inhibitors in people with prediabetes, defined as impaired glucose tolerance, impaired fasting blood glucose, elevated glycated hemoglobin A1c (HbA1c).[11] It was found that acarbose reduced the incidence of diabetes mellitus type 2 when compared to placebo, however there was no conclusive evidence that acarbose, when compared to diet and exercise, metformin, placebo, or no intervention, improved all-cause mortality, reduced or increased risk of cardiovascular mortality, serious or non-serious adverse events, non-fatal stroke, congestive heart failure, or non-fatal myocardial infarction.[11]

Several studies showed that glucosidase inhibitors and alpha-amylase inhibitors promote loss of visceral fat and waist by acting as calorie restriction mimetics (linked to its acarbose-like action).[12][3]

Combination therapy

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The combination of acarbose with metformin results in greater reductions of HbA1c, fasting blood glucose and post-prandial glucose than either agent alone.[13]

Adverse effects

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Since acarbose prevents the degradation of complex carbohydrates into glucose, some carbohydrate will remain in the intestine and be delivered to the colon. In the colon, bacteria digest (ferment) the complex carbohydrates, causing gastrointestinal side-effects such as flatulence (78% of patients) and diarrhea (14% of patients). Since these effects are dose-related, in general it is advised to start with a low dose and gradually increase the dose to the desired amount. One study found that gastrointestinal side effects decreased significantly (from 50% to 15%) over 24 weeks, even on constant dosing.[14] Sucrose is more likely to trigger GI side effects compared to starch.[10]

If a patient using acarbose has a bout of hypoglycemia, the patient must eat something containing monosaccharides, such as glucose tablets or gel (GlucoBurst, Insta-Glucose, Glutose, Level One) and a doctor should be called. Because acarbose blocks the breakdown of table sugar and other complex sugars, fruit juice or starchy foods will not effectively reverse a hypoglycemic episode in a patient taking acarbose.[15] Acarbose by itself carries minimal risk of hypoglycemia.[10]

Acarbose is associated with very rare elevated transaminases (19 out of 500,000).[10] Even rarer cases of hepatitis has been reported with acarbose use. It usually goes away when the medicine is stopped. Liver enzymes should be checked before and during use of this medicine as a precaution.[16] A 2016 meta-analysis confirms that alpha-glucosidase inhibitors, including acarbose, have a statistically significant link to elevated transaminase levels.[17]

Pharmacology

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Mechanism of action

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Acarbose inhibits enzymes (glycoside hydrolases) needed to digest carbohydrates, specifically, alpha-glucosidase enzymes in the brush border of the small intestines, and pancreatic alpha-amylase. It locks up the enzymes by mimicking the transition state of the substrate with its amine linkage.[18] However, bacterial alpha-amylases from gut microbiome are able to degrade acarbose.[19][20][21]

Pancreatic alpha-amylase hydrolyzes complex starches to oligosaccharides in the lumen of the small intestine, whereas the membrane-bound intestinal alpha-glucosidases hydrolyze oligosaccharides, trisaccharides, and disaccharides to glucose and other monosaccharides in the small intestine. Inhibition of these enzyme systems reduces the rate of digestion of complex carbohydrates. Less glucose is absorbed because the carbohydrates are not broken down into glucose molecules. In diabetic patients, the short-term effect of these drug therapies is to decrease current blood glucose levels; the long-term effect is a reduction in HbA1c level.[22]

Metabolism

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Acarbose degradation is the unique feature of glycoside hydrolases in gut microbiota, acarbose degrading glucosidase, which hydrolyze acarbose into an acarviosine-glucose and glucose.[21] Human enzymes do transform acarbose: the pancreatic alpha-amylase is able to perform a rearrangement reaction, moving the glucose unit in the "tail" maltose to the "head" of the molecule. Analog drugs with the "tail" glucose removed or flipped to an α(1-6) linkage resist this transformation.[18]

It has been reported that the maltogenic alpha-amylase from Thermus sp. IM6501 (ThMA) and a cyclodextrinase (CDase) from Streptococcus pyogenes could hydrolyse acarbose to glucose and acarviosine-glucose, ThMA can further hydrolyze acarviosine-glucose into acarviosin and glucose.[23][24] A cyclomaltodextrinase (CDase) from gut bacteria Lactobacillus plantarum degraded acarbose via two different modes of action to produce maltose and acarviosin, as well as glucose and acarviosine-glucose, suggest that acarbose resistance is caused by the human microbiome.[4] The microbiome-derived acarbose kinases are also specific to phosphorylate and inactivate acarbose.[25] The molecular modeling showed the interaction between gut bacterial acarbose degrading glucosidase and human α-amylase.[26]

secretion of gut bacterial enzymes inhibit acarbose.
Acarbose is degraded by different enzymes in the gut microbiome
Acarbose is degraded by different enzymes in the gut microbiome. secretion of gut bacterial enzymes inhibit acarbose.
Acarbose degradation by gut bacterial maltogenic amylase

Natural distribution

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In nature, acarbose is synthesized by soil bacteria Actinoplanes sp through its precursor valienamine.[27] And acarbose is also degraded by gut bacteria Lactobacillus plantarum and soil bacteria Thermus sp by acarbose degrading glucosidases.

In molecular biology

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Acarbose is described chemically as a pseudotetrasaccharide,[28] specifically a maltotetraose mimic inhibitor. As an inhibitor that mimics some natural substrates, it is useful for elucidating the structure of sugar-digesting enzymes, by binding into the same pocket.[29]

Research

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Most studies investigating alpha-glucosidase and alpha-amylase inhibitory activity use acarbose as reference[3][30].

In human T2DM patients, acarbose reduces total triglyceride levels.[31] Acarbose has a similar effect in non-T2DM patients with isolated familial hypertriglyceridemia.[10]

In smaller samples of healthy human volunteers, acarbose increases postprandial GLP-1 levels.[10]

In studies conducted by three independent laboratories by the US National Institute on Aging's intervention testing programme, acarbose was shown to extend the lifespan of female mice by 5% and of male mice by 22%.[32][33]

See also

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References

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  1. ^ Elks J, Ganellin CR, eds. (1990). The Dictionary of Drugs: Chemical Data: Chemical Data, Structures and Bibliographies. Springer. pp. 1–. doi:10.1007/978-1-4757-2085-3. ISBN 978-1-4757-2085-3.
  2. ^ "International Nonproprietary Names for Pharmaceutical Substances. Recommended International Nonproprietary Names (Rec. INN): List 19" (PDF). World Health Organization. 1979. Retrieved 9 November 2016.
  3. ^ a b c d Moreira, Fernanda Duarte; Reis, Caio Eduardo Gonçalves; Gallassi, Andrea Donatti; Moreira, Daniel Carneiro; Welker, Alexis Fonseca (2024-10-09). Dardari, Dured (ed.). "Suppression of the postprandial hyperglycemia in patients with type 2 diabetes by a raw medicinal herb powder is weakened when consumed in ordinary hard gelatin capsules: A randomized crossover clinical trial". PLoS One. 19 (10): e0311501. doi:10.1371/journal.pone.0311501. ISSN 1932-6203. PMC 11463819. PMID 39383145.
  4. ^ a b Jang MU, Kang HJ, Jeong CK, Kang Y, Park JE, Kim TJ (February 2018). "Functional expression and enzymatic characterization of Lactobacillus plantarum cyclomaltodextrinase catalyzing novel acarbose hydrolysis". Journal of Microbiology. 56 (2): 113–118. doi:10.1007/s12275-018-7551-3. PMID 29392561. S2CID 2660911.
  5. ^ Kresge N (21 November 2011). "China's Thirst for New Diabetes Drugs Threatens Bayer's Lead". Bloomberg Business Week. Archived from the original on 21 November 2011. Retrieved 15 April 2016.
  6. ^ Zhang W, Kim D, Philip E, Miyan Z, Barykina I, Schmidt B, Stein H (April 2013). "A multinational, observational study to investigate the efficacy, safety and tolerability of acarbose as add-on or monotherapy in a range of patients: the Gluco VIP study". Clinical Drug Investigation. 33 (4): 263–274. doi:10.1007/s40261-013-0063-3. PMID 23435929. S2CID 207483590.
  7. ^ Zhu Q, Tong Y, Wu T, Li J, Tong N (June 2013). "Comparison of the hypoglycemic effect of acarbose monotherapy in patients with type 2 diabetes mellitus consuming an Eastern or Western diet: a systematic meta-analysis". Clinical Therapeutics. 35 (6): 880–899. doi:10.1016/j.clinthera.2013.03.020. PMID 23602502.
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  18. ^ a b Li C, Begum A, Numao S, Park KH, Withers SG, Brayer GD (March 2005). "Acarbose rearrangement mechanism implied by the kinetic and structural analysis of human pancreatic alpha-amylase in complex with analogues and their elongated counterparts". Biochemistry. 44 (9): 3347–3357. doi:10.1021/bi048334e. PMID 15736945.
  19. ^ Park KH, Kim MJ, Lee HS, Han NS, Kim D, Robyt JF (December 1998). "Transglycosylation reactions of Bacillus stearothermophilus maltogenic amylase with acarbose and various acceptors". Carbohydrate Research. 313 (3–4): 235–246. doi:10.1016/S0008-6215(98)00276-6. PMID 10209866.
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  21. ^ a b Kim TJ, Kim MJ, Kim BC, Kim JC, Cheong TK, Kim JW, Park KH (April 1999). "Modes of action of acarbose hydrolysis and transglycosylation catalyzed by a thermostable maltogenic amylase, the gene for which was cloned from a Thermus strain". Applied and Environmental Microbiology. 65 (4): 1644–1651. Bibcode:1999ApEnM..65.1644K. doi:10.1128/AEM.65.4.1644-1651.1999. PMC 91232. PMID 10103262.
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  24. ^ Baek JS, Kim HY, Abbott TP, Moon TW, Lee SB, Park CS, Park KH (March 2003). "Acarviosine-simmondsin, a novel compound obtained from acarviosine-glucose and simmondsin by Thermus maltogenic amylase and its in vivo effect on food intake and hyperglycemia". Bioscience, Biotechnology, and Biochemistry. 67 (3): 532–539. doi:10.1271/bbb.67.532. PMID 12723600. S2CID 2813481.
  25. ^ Balaich J, Estrella M, Wu G, Jeffrey PD, Biswas A, Zhao L, et al. (December 2021). "The human microbiome encodes resistance to the antidiabetic drug acarbose". Nature. 600 (7887): 110–115. Bibcode:2021Natur.600..110B. doi:10.1038/s41586-021-04091-0. PMC 10258454. PMID 34819672. S2CID 244644880.
  26. ^ Park KH (2006). "Function and Tertiary- and Quaternary-structure of Cyclodextrin-hydrolyzing Enzymes (CDase), a Group of Multisubstrate Specific Enzymes Belonging to the α-Amylase Family". Journal of Applied Glycoscience. 53 (1): 35–44. doi:10.5458/jag.53.35. ISSN 1344-7882. S2CID 86894203.
  27. ^ Tsunoda T, Samadi A, Burade S, Mahmud T (June 2022). "Complete biosynthetic pathway to the antidiabetic drug acarbose". Nature Communications. 13 (1): 3455. Bibcode:2022NatCo..13.3455T. doi:10.1038/s41467-022-31232-4. PMC 9200736. PMID 35705566.
  28. ^ Bozonnet S, Jensen MT, Nielsen MM, Aghajari N, Jensen MH, Kramhøft B, et al. (October 2007). "The 'pair of sugar tongs' site on the non-catalytic domain C of barley alpha-amylase participates in substrate binding and activity". The FEBS Journal. 274 (19): 5055–5067. doi:10.1111/j.1742-4658.2007.06024.x. PMID 17803687. S2CID 25592455.
  29. ^ Miyazaki T, Park EY (June 2020). "Structure-function analysis of silkworm sucrose hydrolase uncovers the mechanism of substrate specificity in GH13 subfamily 17 exo-α-glucosidases". The Journal of Biological Chemistry. 295 (26): 8784–8797. doi:10.1074/jbc.RA120.013595. PMC 7324511. PMID 32381508.
  30. ^ Hayward, Nicholas J.; McDougall, Gordon J.; Farag, Sara; Allwood, J. William; Austin, Ceri; Campbell, Fiona; Horgan, Graham; Ranawana, Viren (2019-12). "Cinnamon Shows Antidiabetic Properties that Are Species-Specific: Effects on Enzyme Activity Inhibition and Starch Digestion". Plant Foods for Human Nutrition. 74 (4): 544–552. doi:10.1007/s11130-019-00760-8. ISSN 0921-9668. PMC 6900266. PMID 31372918. {{cite journal}}: Check date values in: |date= (help)CS1 maint: PMC format (link)
  31. ^ Yousefi M, Fateh ST, Nikbaf-Shandiz M, Gholami F, Rastgoo S, Bagher R, et al. (November 2023). "The effect of acarbose on lipid profiles in adults: a systematic review and meta-analysis of randomized clinical trials". BMC Pharmacology & Toxicology. 24 (1): 65. doi:10.1186/s40360-023-00706-6. PMC 10664642. PMID 37990256.
  32. ^ Harrison DE, Strong R, Allison DB, Ames BN, Astle CM, Atamna H, et al. (April 2014). "Acarbose, 17-α-estradiol, and nordihydroguaiaretic acid extend mouse lifespan preferentially in males". Aging Cell. 13 (2): 273–282. doi:10.1111/acel.12170. PMC 3954939. PMID 24245565.
  33. ^ Ladiges W, Liggitt D (2017). "Testing drug combinations to slow aging". Pathobiology of Aging & Age Related Diseases. 8 (1): 1407203. doi:10.1080/20010001.2017.1407203. PMC 5706479. PMID 29291036.
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