Antiulcerogenic Activity of <em>Convolvulus</em> Species

Review Article

Austin Chromatogr. 2014;1(4): 9.

Antiulcerogenic Activity of Convolvulus Species

Amani S Awaad1*, Asmaa A Al-Rifai2, Reham M El-Meligy2, Ahmed M Alafeefy3 and Saleh I Alqasoumi4

1Department of Pharmacognosy, Salman bin Abdulaziz University, Saudi Arabia

2Department of Chemistry, King Saud University, Saudi Arabia

3Department of Medicinal chemistry, Salman bin Abdulaziz University, Saudi Arabia

4Department of Pharmacognosy, King Saud University, Saudi Arabia

*Corresponding author: Amani S Awaad, Pharmacognosy Department, College of Pharmacy, Salman bin, Abdulaziz University, Al-Kharj, KSA, Riyadh, P.O. Box 173, Riyadh 11942, Saudi Arabia

Received: September 29, 2014; Accepted: November 13, 2014; Published: November 20, 2014

Abstract

Peptic ulcer disease is one of the most serious gastrointestinal disorders that affect large number of people worldwide and it considered one of the major causes of diseases in the world; because of that it occupies the main position in concern of researchers. The main aim of this article is to search for a safe drug from natural sources, to be used for treatment of ulcers without side effects. Several reports showed that a large number of medicinal plants from Convolvulus species possess antiulcer activity in addition to other activities.

Our goal is to collect and compare published data in the last 28 reviews concerning the natural products and the synthetic ones from Convolvulus species and other families in the treatment of this disease and other diseases; in addition a quick screening for phytochemical and biological activities of different Convolvulus species are reported.

Keywords: Antiulcerogenic activity; Convolvulus; Peptic ulcer; Natural products

Introduction

Family Convolvulaceae contains a large number of important plants which are used in treatment of various diseases elsewhere such as; headache, constipation, rheumatism, diabetes and skin infection [1]. Members of this family mainly contain phenolic, tropane alkaloids [2], flavanoids and coumarins [3].The largest genus of family Convolvulaceae is Convolvulus; it comprises 250 species present as trees, shrubs or herbs [4]. Many Convolvulus species are valuable ornamentals, medicinal and food crops [5]. They possess cytotoxic [6], antioxidant, anti-inflammatory and antiulcer activities [3]. In addition they can be used in treatment of coughs and asthma [1].

Peptic ulcer is one of the most common chronic gastrointestinal disorders in modern era. Now it has become a common global health problem affecting a large number of people worldwide and it still a major cause of illness and deaths [7]. There are different classes of drugs are used in the treatment of peptic ulcer, most of them exhibits serious side effects like; arrhythmias, gynaecomastia, arthralgia, hypergastrinemia [8], impotence, haemopoeitic changes [7], nausea, abdominal pain, constipation and diarrhea [9].

Plant secondary metabolites have been in use for centuries to cure various ailments. The use of natural medicine in the treatment of peptic ulcer is an absolute requirement of our effort [10]. Traditional medicine has proved to be clinically effective and relatively less toxic than the existing drugs and also reduces the offensive factors serving as a tool in the prevention of peptic ulcer [11].

Plants with anti ulcerogenic activity were used either as row materials which obtained by extraction with various solvents or as individual isolated compounds. Many solvents have been used to extract active materials from plants such as; alcohol (ethanol or methanol), ether, chloroform, ethyl acetate, n-butanol and water [12].

Peptic ulcer is one of the most serious gastrointestinal disorders which occupy the main position in concern of researchers [13], it can be caused by many factors such as; stress [14], Helicobacter pylori [15], acid–pepsin secretion [16], nonsteroidal anti-inflammatory drug [17], cigarettes [18], nutritional deficiencies [19] as well as alcohol [20]. It is a lesion in the gastrointestinal tract that usually occurs in the stomach and duodenum and is characterized by mucosal damage [21].

Natural anti-ulcer products

Peptic ulcer therapy has undergone many steps over the past few years and both herbal and synthetic drugs are now available offering newer and better options for treatment of peptic ulcer [8]. Many synthetic drugs have been used in the treatment of gastric ulcers such as; antiacids, anticholinergics, proton pump inhibitors and H2- receptor antagonists [22]. However, these drugs are expensive [21] and showed an incidence of relapses, drug interactions and side effects [23] thereby limiting their usefulness. The search for an ideal anti-ulcer drug with new and novel molecules has also been extended to herbal drugs and their isolated compounds as alternative ways for treatment of ulcers that afford better protection [24], clinically effective, possess good tolerability even in higher doses [25] and lack of side effects compared to synthetic drugs [26].

Recently, plant extracts are considered to be one of the most attractive sources for developing new drugs and have been shown immense potential results in the treatment of gastric ulcers [27,28]. The literature reported many medicinal plants with antiulcer activity which is used as row materials (obtained by extraction with solvents) or as individual isolated compounds [29]. Some plants and isolated compounds with antiulcerogenic activity are reported in (Table 1).