Phytotherapy for Peptic-ulcer: An overview on important Indian herbal plants having flavonoid as antiulcer activity.
DOI:
https://doi.org/10.14719/pst.1350Keywords:
Peptic ulcer, Herbal plants, Gastroprotective, Flavonoids, Mechanism of actionAbstract
Peptic ulcers are described by erosions of the gastrointestinal mucosa that can reach the muscular layer. Peptic ulcers are a widespread health condition that affects millions of individuals and has a high recurrence rate. “No gastric acid, no peptic ulcer” is a flawed assumption. Excessive gastric acid secretion is only one factor in the pathogenesis of peptic ulcer disease. Their etiology is multifactorial and develops when the balance of offensive and protective components is disrupted. Its treatment faces great difficulties due to the limited effectiveness and severe side effects of the currently available drugs. Natural products such as herbal plants and their isolated compounds have been widely used in experimental models of peptic ulcers. Flavonoids strengthened defensive factors had cytoprotective and rehabilitative actions. Flavonoids are among the molecules of greatest interest in biological assays due to their anti-inflammatory, antioxidant properties. The present study is a literature review of herbal plants having flavonoid that have been reported to show peptic ulcer activity in experimental models using the divergent mechanism of action.
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References
Malfertheiner P, Chan FK, McColl KE. Peptic ulcer disease. The lancet. 2009 Oct 24;374(9699):1449-61. https://doi.org/10.1016/S0140-6736(09)60938-7
Umamaheswari M, Asokkumar K, Rathidevi R, Sivashanmugam A, Subhadradevi V, Ravi TJJoe. Antiulcer and in vitro antioxidant activities of Jasminum grandiflorum L. J. ethnopharmacol.2007;110: 464-70 https://doi.org/10.1016/j.jep.2006.10.017
R.M.N. McSween, K. Whaley, Muir’s Textbook of Pathology, 13th Ed, (ELBS Arnold, London, 1992) pp. 695-96.
Vyawahare N, Deshmukh V, Gadkari M, Kagathara V. Plants with antiulcer activity. Pharmacogn Rev. 2009;3(5):118.
Fox M, Barr C, Nolan S, Lomer M, Anggiansah A, Wong T. The effects of dietary fat and calorie density on esophageal acid exposure and reflux symptoms. Clinical Gastroenterology and Hepatology. 2007 Apr 1;5(4):439-44. https://doi.org/10.1016/j.cgh.2006.12.013
Waxman I, Gardner JD, Jensen RT, Maton PN. Peptic ulcer perforation as the presentation of Zollinger-Ellison syndrome. Digestive diseases and sciences. 1991 Jan 1;36(1):19-24. https://doi.org/10.1007/BF01300081
Bhowmik D, Chiranjib TK, Pankaj KS. Recent trends of treatment and medication peptic ulcerative disorder. Int J Pharm Tech Research. 2010;2(1):970-80.
Hunt RH, Tytgat Guido N J.Basic Mechanisms to Clinical Cure 1996. london(UK): Kluwer academic publisher ; 1996DOI: 10.1007/978-94-009-1792-7
Soll AH, Weinstein WM, Kurata J, McCarthy, DJAoim. Nonsteroidal anti-inflammatory drugs and peptic ulcer disease. Ann. Intern. Med.1991;114:307-19. https://doi.org/10.7326/0003-4819-114-4-307
De Vries AC, Kuipers EJ. Helicobacter pylori infection and nonmalignant diseases. Helicobacter. 2010; 15:29-33. https://doi.org/10.1111/j.1523-5378.2010.00775.x
Calam, J.; Baron, J. H. Pathophysiology of duodenal and gastric ulcer and gastric cancer. Brit Med J. 2001, 323, 980–983. [Google Scholar]
Zimmerman TW, Problems associated with medical treatment of peptic ulcer disease. The Am. J. Med. 1984; 77:51-56. PMID: 6095662
Tarnawski, A. Cytoprotective Drugs. Drug Invest 2, 1–6 (1990). https://doi.org/10.1007/BF03259169
Howden CW, Jones DB, Peace KE, Burget DW, Hunt RH. The treatment of gastric ulcer with antisecretory drugs. Dig. Dis. and Sci. 1988 ;33:619-24.
https://doi.org/10.1007/BF01798367
K.D. Tripathi, Essentials of Medical Pharmacology, 5th Ed, (Jaypee Brothers Medical Publishers (P) Ltd, New Delhi, 2003) pp.589-95.
Morrissey JF, Barreras RF. Drug therapy. Antacid therapy. N Engl J Med. 1974 Mar 7;290(10):550-4. doi: 10.1056/NEJM197403072901007. PMID: 4359481.
Kuna L, Jakab J, Smolic R, Raguz-Lucic N, Vcev A, Smolic M. Peptic ulcer disease: a brief review of conventional therapy and herbal treatment options. J. of clinical med. 2019; 8:179. https://doi.org/10.3390/jcm8020179
Fintelmann V. Modern phytotherapy and its uses in gastrointestinal conditions. Planta medica. 1991 Oct;57(S 1):S48-52.DOI: 10.1055/s-2006-960229
Borrelli F, Izzo AA. The plant kingdom as a source of anti?ulcer remedies. Phytotherapy Research: An International Journal Devoted to Pharmacological and Toxicological Evaluation of Natural Product Derivatives. 2000 Dec;14(8):581-91. https://doi.org/10.1002/1099-1573(200012)14:8<581
Chelladurai PK, Ramalingam R. Myristica malabarica: A comprehensive review. J Pharmacogn Phytochem. 2017;6(2):255-8.
Banerjee D, Maity B, Bauri AK, Bandyopadhyay SK, Chattopadhyay S. Gastroprotective properties of Myristica malabarica against indometacin-induced stomach ulceration: a mechanistic exploration. J Pharm Pharmacol. 2007 Nov;59(11):1555-65.https://doi.org/10.1211/jpp.59.11.0014.
Nagaratna A, Hegde PL. A comprehensive review on Parnabeeja [Bryophyllum pinnatum (Lam.) Oken]. J med plants stud. 2015;3(5):166-71.
Radwan-Prag?owska J, Janus ?, Pi?tkowski M, Sierakowska A, Galek T, Szajna E, Bogda? D, Tupaj M. Fungal Chitosan-Derived Biomaterials Modified with Kalanchoe pinnata as Potential Hemostatic Agents—Development and Characterization. Polymers. 2021 Jan;13(8):1300. https://doi.org/10.3390/polym13081300
Kamboj A, Saluja A. Bryophyllum pinnatum (Lam.) Kurz.: Phytochemical and pharmacological profile: A review. Pharmacogn Rev. 2009 Jul 1;3(6):364. Available Online : www.phcogrev.com
Dwivedi V, Tripathi S. Review study on potential activity of Piper betle. J PharmacognPhytochem. 2014;3(4):93-8.
Bhattacharya S, Banerjee D, Bauri AK, Chattopadhyay S, Bandyopadhyay SK. Healing property of the Piper betel phenol, allylpyrocatechol against indomethacin-induced stomach ulceration and mechanism of action. World J Gastroenterol: WJG. 2007 Jul 21;13(27):3705. doi: 10.3748/wjg.v13.i27.3705 [PMID: 17659730]
Alok S, Jain SK, Verma A, Kumar M, Mahor A, Sabharwal M. Plant profile, phytochemistry and pharmacology of Asparagus racemosus (Shatavari): A review.Asian Pac J Trop Dis. 2013 Apr 1;3(3):242-51. https://doi.org/10.1016/S2222-1808(13)60049-3
Bhatnagar M, Sisodia SS. Antisecretory and antiulcer activity of Asparagus racemosusWilld. against indomethacin plus pyloric ligation-induced gastric ulcer in rats. J. Herb. Pharmacother. 2006 Jan 1;6(1):13-20.https://doi.org/10.1080/J157v06n01_02
Arulmozhi S, Mazumder PM, Ashok P, Narayanan LS. Pharmacological activities of AlstoniascholarisLinn.(Apocynaceae)-A review. Pharmacog Reviews. 2007;1(1).
Chavan GM, Ranalkar MD, Bagul SK, Patil SG, Patil SA, Pawar SP. Evaluation of Anti-ulcer Activity of leaves of AlstoniaScholaris [L] R Br by using Pylorus Ligation Method. Journal of Seybold Report ISSN.(1533):9211
Mayilsamy M, Rajendran A. Ethnomedicinal plants used by paliyar tribals in Dindigul district of Tamil Nadu, India.Int J Sci Innovs Disc. 2013;3(1):146-52.
Shree GK, Parvathi S, Ramkumar PS, Priya SS. Pharmacological and phytochemical evaluation of anti-ulcerogenic potential of Solanum nigrum. Int J Pharm Sci Res. 2012 Aug 1;3(8):2837.DOI: http://dx.doi.org/10.13040/IJPSR.0975-8232.3(8).2837-40
Rajvaidhya S, Nagori BP, Singh GK, Dubey BK, Desai P, Jain S. A review on Acacia Arabica-an Indian medicinal plant. International Journal of pharmaceutical sciences and research. 2012 Jul 1;3(7):1995. http://dx.doi.org/10.13040/IJPSR.0975-8232.3(7).1995-05
Helal OK, Yousef MM, Elnaa M. Possible protective effect of gum arabic on experimentally induced gastric ulcer in adult male albino rats: a histological and immunohistochemical study. Egypt. J. Histol. 2011 Sep 1;34(3):546-550.
doi: 10.1097/EHX.0000399971.18980.f6
Shabbir A. Rhus coriaria linn, a plant of medicinal, nutritional and industrial importance: a review. J Anim Plant Sci. 2012 Jan 1;22(2):505-12.
Ahmad H, Wadud A, Jahan N, Khazir M, Sofi G. Evaluation of anti-ulcer activity of hydro alcoholic extract of Post Sumaq (Rhus coriaria Linn.) in Ethanol induced Gastric ulcer in experimental rats.Int J Res Med Sci. 2013;1(10):7-12.
Available online at: www.isca.in, www.isca.me
Grover JK, Yadav SP. Pharmacological actions and potential uses of Momordica charantia: a review. Journal of ethnopharmacology. 2004 Jul 1;93(1):123-32. https://doi.org/10.1016/j.jep.2004.03.035
Rao NV, Venu K, Sowmya U, Gangadi JR, Anirudh K. Evaluation of antiulcer activity of Momordica charantia in rats. Int J Pharm Biol Sci. 2011;1(1):1-6.
Govindarajan R, Vijayakumar M, Singh M, Rao CV, Shirwaikar A, Rawat AK, Pushpangadan P. Antiulcer and antimicrobial activity of Anogeissus latifolia. J Ethnopharmacol. 2006 Jun 15;106(1):57-61.https://doi.org/10.1016/j.jep.2005.12.002
Hiruma-Lima CA, Calvo TR, Rodrigues CM, Andrade FD, Vilegas W, Brito AR. Antiulcerogenic activity of Alchorneacastaneaefolia: effects on somatostatin, gastrin and prostaglandin. J Ethnopharmacol. 2006 Mar 8;104(1-2):215-24.
https://doi.org/10.1016/j.jep.2005.09.007
Gorelick J, Bernstein N. Elicitation: An underutilized tool in the development of medicinal plants as a source of therapeutic secondary metabolites. Advances in agronomy. 2014 Jan 1;124:201-30.https://doi.org/10.1016/B978-0-12-800138-7.00005-X
de Barros M, Da Silva LM, Boeing T, Somensi LB, Cury BJ, de Moura Burci L, Santin JR, de Andrade SF, Delle Monache F, Cechinel-Filho V. Pharmacological reports about gastroprotective effects of methanolic extract from leaves of Solidago chilensis (Brazilian arnica) and its components quercitrin and afzelin in rodents.NaunynSchmiedebergs Arch Pharmacol. 2016 Apr 1;389(4):403-17. DOI. https://doi.org/10.1007/s00210-015-1208-0
Martin MJ, Marhuenda E, Perez-Guerrero C, Franco JM. Antiulcer effect of naringin on gastric lesions induced by ethanol in rats. Pharmacology. 1994;49(3):144-50.doi:10.1159/000139228
Yamahara J, Mochizuki M, Fujimura H, Takaishi Y, Yoshida M, Tomimatsu T, Tamai Y. Antiulcer action of Sophora flavescens root and an active constituent. I. J ethnopharmacol. 1990 May 1;29(2):173-7. doi:10.1016/0378-8741(90)90053-V.
Calderon-Montan˜o JM, Burgos-Moron E, Perez-Guerrero C, Lopez-Lazaro M. 2011. A review on the dietary flavonoid kaempferol. Mini Rev Med Chem. 11:298–34. https://doi.org/10.2174/138955711795305335
De La Lastra CA, Martin MJ, Marhuenda E. Gastric anti?ulcer activity of silymarin, a lipoxygenase inhibitor, in rats. JpharmPharmacol. 1992 Nov;44(11):929-31.doi:10.1111/j.2042-7158.1992.tb03239.x.
Carvalho AC, Guedes MM, de Souza AL, Trevisan MT, Lima AF, Santos FA, Rao VS. Gastroprotective effect of mangiferin, a xanthonoid from Mangifera indica, against gastric injury induced by ethanol and indomethacin in rodents. Planta medica. 2007 Oct;73(13):1372-6. DOI: 10.1055/s-2007-993751.
Bighetti AE, Antonio MA, Kohn LK, Rehder VL, Foglio MA, Possenti A, Vilela L, Carvalho JE. Antiulcerogenic activity of a crude hydroalcoholic extract and coumarin isolated from Mikania laevigata Schultz Bip. Phytomedicine. 2005 Jan 10;12(1-2):72-7.
https://doi.org/10.1016/j.phymed.2003.09.006
da Silva MA, Oliveira AP, Sannomiya M, Sano PT, Varanda EA, Vilegas W, dos Santos LC. Flavonoids and a naphthopyranone from Eriocaulon ligulatum and their mutagenic activity. Chem Pharm Bull . 2007 Nov 1;55(11):1635-9. doi:10.1023/B:DDAS.0000020490.34220.6d.
Prabha P, Karpagam T, Varalakshmi B, Packiavathy AS. Indigenous anti-ulcer activity of Musa sapientum on peptic ulcer. Pharmacognosy Res. 2011 Oct;3(4):232.
doi: 10.4103/0974-8490.89742
Ribeiro AR, do Nascimento Valença JD, da Silva Santos J, Boeing T, da Silva LM, de Andrade SF, Albuquerque-Júnior RL, Thomazzi SM. The effects of baicalein on gastric mucosal ulcerations in mice: Protective pathways and anti-secretory mechanisms. Ch Chem Biol Interact. 2016 Dec 25;260:33-41. https://doi.org/10.1016/j.cbi.2016.10.016
Abdelwahab SI, Mohan S, Abdulla MA, Sukari MA, Abdul AB, Taha MM, Syam S, Ahmad S, Lee KH. The methanolic extract of Boesenbergia rotunda (L.) Mansf. and its major compound pinostrobin induces anti-ulcerogenic property in vivo: possible involvement of indirect antioxidant action. J Ethnopharmacol. 2011 Sep 2;137(2):963-70. https://doi.org/10.1016/j.jep.2011.07.010
Repetto MG, Llesuy SF. Antioxidant properties of natural compounds used in popular medicine for gastric ulcers. Braz J Med Biol Res. 2002 May;35(5):523-34. DOI:10.1590/S0100-879X2002000500003
La Casa C, Villegas I, De La Lastra CA, Motilva V, Calero MM. Evidence for protective and antioxidant properties of rutin, a natural flavone, against ethanol induced gastric lesions. J Ethnopharmacol. 2000 Jul 1;71(1-2):45-53.https://doi.org/10.1016/S0378-8741(99)00174-9
Dai XP, Li JB, Liu ZQ, Ding X, Huang CH, Zhou B. Effect of Jianweiyuyang granule on gastric ulcer recurrence and expression of VEGF mRNA in the healing process of gastric ulcer in rats. World J Gastroenterol.2005 Sep 21;11(35):5480. doi: 10.3748/wjg.v11.i35.5480
Melese E, Asres K, Asad M, Engidawork E. Evaluation of the antipeptic ulcer activity of the leaf extract of Plantago lanceolata L. in rodents.Phytother Res. 2011 Aug;25(8):1174-80. https://doi.org/10.1002/ptr.3411
Feldman M. Suppression of acid secretion in peptic ulcer disease. J Clin Gastroenterol. 1995 Jan 1;20:S1-6. DOI: 10.1097/00004836-199506001-00002. PMID: 7673607.
Dharmani P, Kuchibhotla VK, Maurya R, Srivastava S, Sharma S, Palit G. Evaluation of anti-ulcerogenic and ulcer-healing properties of Ocimum sanctum Linn. J Ethnopharmacol. 2004 Aug 1;93(2-3):197-206. DOI: 10.1016/j.jep.2004.02.029
Wang CH, Wang YH, Zhou Y. Clinical and experimental study on effect of Chinese herbal drugs on producing prostaglandin in gastric mucosa.Chin jintegr trad West med. 1994 Sep 1;14(9):528-30. [PMID: 7865999]
Cheng CL, Guo JS, Luk J, Koo MW. The healing effects of Centella extract and asiaticoside on acetic acid induced gastric ulcers in rats. Life sciences. 2004 Mar 19;74(18):2237-49. DOI: 10.1016/j.lfs.2003.09.055
Pereira IT, Burci LM, da Silva LM, Baggio CH, Heller M, Micke GA, Pizzolatti MG, Marques MC, de Paula Werner MF. Antiulcer effect of bark extract of Tabebuia avellanedae: activation of cell proliferation in gastric mucosa during the healing process.Phytother Res. 2013 Jul;27(7):1067-73. DOI: 10.1002/ptr.4835.
Xu X, Xie B, Pan S, Liu L, Wang Y, Chen C. Effects of sea buckthorn procyanidins on healing of acetic acid-induced lesions in the rat stomach. Asia Pac J Clin Nutr. 2007 Jan 1;16(suppl 1):234-8.
Malfertheiner P. The intriguing relationship of Helicobacter pylori infection and acid secretion in peptic ulcer disease and gastric cancer. Dig Dis. 2011;29(5):459-64. DOI: 10.1159/000332213
Miller MJ, MacNaughton WK, Zhang XJ, Thompson JH, Charbonnet RM, Bobrowski P, Lao J, Trentacosti AM, Sandoval M. Treatment of gastric ulcers and diarrhea with the Amazonian herbal medicine sangre de grado. Am J PhysiolGastrointest Liver Physiol. 2000 Jul 1;279(1):G192-200.https://doi.org/10.1152/ajpgi.2000.279.1.G192
Venables CW. Mucus, pepsin, and peptic ulcer. Gut. 1986 Mar;27(3):233.DOI: 10.1136/gut.27.3.233
Allen A, Flemstro?m G. Gastroduodenal mucus bicarbonate barrier: protection against acid and pepsin. Am J Physiol Cell Physiol. 2005 Jan;288(1):C1-9.
https://doi.org/10.1152/ajpcell.00102.2004
Ito M, Ban A, Ishihara M. Anti-ulcer effects of chitin and chitosan, healthy foods, in rats.Jpn J Pharmacol. 2000;82(3):218-25. DOI: 10.1254/jjp.82.218
Allen A, Pearson JP, Blackburn A, Coan RM, Hutton DA, Mall AS. Pepsins and the mucus barrier in peptic ulcer disease.Scand J Gastroenterol Suppl. 1988 Jan 1;23(sup146):50-7. DOI: 10.3109/00365528809099130
Ge Y, Cui JC, Zhou RL, Chen YX, Sun L, Ling FM, Chen LL. Clinical and experimental study on separately decocted and mingly decocted jianweishu granule. Chin J Integr Trad West Med. 2002 Sep 1;8(3):199. https://doi.org/10.1007/BF02934309.
Bi WP, Man HB, Man MQ. Efficacy and safety of herbal medicines in treating gastric ulcer: a review. World Journal of Gastroenterology: WJG. 2014 Dec 7;20(45):17020.
Cesarone MR, Laurora G, Ricci A, Belcaro G, Pomante P, Candiani C, Leon M, Nicolaides AN. Acute effects of hydroxyethylrutosides on capillary filtration in normal volunteers, patients with venous hypertension and in patients with diabetic microangiopathy (a dose comparison study). VASA. Zeitschrift fur Gefasskrankheiten. 1992 Jan 1;21(1):76-80.
Attaguile G, Caruso A, Pennisi G, Savoca F. Gastroprotective effect of aqueous extract of Cistus incanus L. in rats. Pharmaco res. 1995 Jan 1;31(1):29-32.https://doi.org/10.1016/1043-6618(95)80043-3
Beil W, Birkholz C, Sewing KF. Effects of flavonoids on parietal cell acid secretion, gastric mucosal prostaglandin production and Helicobacter pylori growth. Arzneimittel-forschung. 1995 Jun 1;45(6):697-700. PMID: 7646573
Amellal M, Bronner C, Briancon F, Haag M, Anton R, Landry Y. Inhibition of mast cell histamine release by flavonoids and biflavonoids. Planta Medica. 1985 Feb;51(01):16-20. DOI: 10.1055/s-2007-969381
Borrelli F, Izzo AA. The plant kingdom as a source of anti?ulcer remedies. Phytother Res.2000 Dec;14(8):581-91.https://doi.org/10.1002/1099-1573(200012)14
Kumar S, Pandey AK. Chemistry and biological activities of flavonoids: an overview. Sci. World J. 2013 Oct;2013:90-98. https://doi.org/10.1155/2013/162750
Modaresi M, AlasvandZarasvand M, Madani M. The effects of hydro-alcoholic extract of Artemisia dracunculus L.(Tarragon) on hematological parameters in mice. J Basic Res Med Sci. 2018 Jan 10;5(1):10-4. DOI: 10.29252/jbrms.5.1.10.
Martín MJ, Motilva V. Antiulcer and gastroprotective effects of quercetin: a gross and histologic study. Pharmacology. 1994 Jan 1;48(1):56-62.DOI: 10.1159/000139162
Hosseinzadeh H, Nassiri-Asl M. Review of the protective effects of rutin on the metabolic function as an important dietary flavonoid. J Endocrinol Invest. 2014 Sep;37(9):783-8. https://doi.org/10.1007/s40618-014-0096-3
Tapas AR, Sakarkar DM, Kakde RB. Flavonoids as nutraceuticals: a review. Trop J Pharm Res. 2008;7(3):1089-99. DOI: 10.4314/tjpr.v7i3.14693
M Calderon-Montano J, Burgos-Morón E, Pérez-Guerrero C, López-Lázaro M. A review on the dietary flavonoid kaempferol. Mini reviews in medicinal chemistry. 2011 Apr 1;11(4):298-344. https://doi.org/10.2174/138955711795305335
Majee C, Mazumder R, Choudhary AN. Medicinal plants with anti-ulcer and hepatoprotective activity: A review. Int. J. Pharm. Sci. Res. 2019 Jan 1;1:1-1.
Izzo AA, Carlo GD, Mascolo N, Capasso F, Autore G. Antiulcer effect of flavonoids. Role of endogenous PAF. Phytotherapy Research. 1994 May;8(3):179-81.https://doi.org/10.1002/ptr.2650080313
Bhia M, Motallebi M, Abadi B, Zarepour A, Pereira-Silva M, Saremnejad F, Santos AC, Zarrabi A, Melero A, Jafari SM, Shakibaei M. Naringenin nano-delivery systems and their therapeuticapplications. Pharmaceutics. 2021Feb;13(2):291. https://doi.org/10.3390/pharmaceutics13020291
De La Lastra CA, Martin MJ, Marhuenda E. Gastric anti?ulcer activity of silymarin, a lipoxygenase inhibitor, in rats. Journal of pharmacy and Pharmacology. 1992 Nov;44(11):929-31.https://doi.org/10.1111/j.2042-7158.1992.tb03239.x
Motilva V, De La Lastra CA, Martin MJ. Ulcer?protecting Effects of Naringenin on Gastric Lesions Induced by Ethanol in Rat: Role of Endogenous Prostaglandins. J Pharm Pharmacol. 1994 Feb;46(2):91-4.https://doi.org/10.1111/j.2042-7158.1994.tb03747.x
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