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Rai Mahendra - Antifungal Metabolites From Plants

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Rai Mahendra Antifungal Metabolites From Plants

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Part 1
Global Distribution of Antifungal Compounds
Mehdi Razzaghi-Abyaneh and Mahendra Rai (eds.) Antifungal Metabolites from Plants 2013 10.1007/978-3-642-38076-1 Springer-Verlag Berlin Heidelberg 2013
Mehdi Razzaghi-Abyaneh and Mahendra Rai (eds.) Antifungal Metabolites from Plants 2013 10.1007/978-3-642-38076-1_1 Springer-Verlag Berlin Heidelberg 2013
1. Antifungal Compounds from Latin American Plants
Laura Svetaz 1, Marcos Derita 1, Ma. Victoria Rodrguez 2, Agustina Postigo 1, Estefana Butassi 1, Ma Victoria Castelli 1, Maximiliano Sortino 1, Elisa Petenatti 3 and Susana Zacchino 1
(1)
School of Biochemical and Pharmaceutical Sciences, National University of Rosario, Suipacha 531, (2000), Rosario, Argentina
(2)
School of Biochemical and Pharmaceutical Sciences, National University of Rosario, Suipacha 531, (2000), Rosario, Argentina
(3)
Pharmacognosy and Herbarium, School of Chemistry, Biochemistry and Pharmacy, National University of San Luis, Chacabuco y Pedernera, (5700), San Luis, Argentina
Susana Zacchino
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Abstract
Latin American region comprises six of the most biologically diverse countries in the world, thus constituting one of the planet areas richest in biodiversity. Some efforts have been made to screen plants of the whole region and also of each country, but the amount of studies in each country is not correlated with its vegetal diversity. Regarding antifungal compounds isolated from this region, many structural types that have demonstrated antifungal properties are presented here. These previous studies are important starting points for the development of new antifungal drugs. However, most studies are preliminary and begin and end with in vitro assays without comparative toxicity studies or in vivo tests. Few of them deepen the mechanisms of action and with rare exceptions, no clinical studies were carried out. A close collaboration among Latin American countries one each other and with the whole world is highly needed and might help in the discovery of new natural antifungal structures from Latin American plants.
1.1 Introduction
Fungi have emerged over the past two decades as major causes of human infections, especially among immunocompromised hosts. They produce serious invasive mycoses in individuals submitted to organ transplants or antineoplastic chemotherapy, those with acquired immunodeficiency syndrome (AIDS), extremely aged persons and patients in intensive care units, among others (Espinel-Ingroff ).
The limited availability of effective antifungal agents, the increasing resistance of fungi to the existing drugs and the very few new drugs in development have led to a general consensus that new antifungal structures are highly needed (Mathew and Nath ).
Among the different possible sources of new antifungal drugs, natural products maintain a great interest because they provide unlimited opportunities for the isolation of new antifungal compounds due to their unmatched availability of chemical diversity (Odds ).
An analysis of the papers published in Journal of Natural Products in the last decade reveals that among the different types of organisms investigated for antifungal properties: 41 % were plants; 34 %, fungi; 20 %, marine organisms and 5 %, bacteria
This analysis evidences the interest of researchers in natural sources for the discovery of antifungal compounds in recent years, that is in contrast to the trend showed by most big pharmas which abandoned antifungal drug discovery programmes based on natural products, including plant biodiversity (Rouhi ). In addition, it is clear that among natural resources, plants have been the most used source for antifungal research.
Regarding the evolution of papers devoted to the search of antifungal compounds in plants, the analysis of two Journals devoted to natural products ( Journal of Ethnopharmacology and Planta Medica) , showed that 221 papers on antifungal screening of plants were published in the JEP in the last three decades, increasing from 16 in 19811990, 66 in 19912000 up to 139 in 20012010. Regarding Planta Medica, 151 papers on antifungal plants were published in the same period, 24 in the first 10 years (19811990), 43 in the second (19912000) and 84 in the third (20012010) (source: unpublished personal analysis by the authors).
The first important concern within a programme of discovery of new plants with antifungal properties is the selection of species to be submitted to biological evaluation.
According to a recent review of Ros and Recio (), a wide range of criteria were followed to select plants to be submitted to antimicrobial studies. Some researchers investigated plants growing in a specific region or country; others focused on plant families; others on ethnopharmacology and many others on the random screening of plants.
Particularly, the study of antifungal plants delimited to a certain region or country is clearly correlated with the region biodiversity, accessibility, research possibilities and many others.
Among the flora of different regions of the world, Latin America represents one of the wealthiest sources of material with pharmacological activity due to its biodiversity (Brando et al. )
This chapter aims to examine the antifungal plants detected within Latin America region. The information has been organized into sections that include a general information about the vegetal diversity in Latin America, the antifungal plants of each country referring first to the screening of crude extracts and then to antifungal isolated constituents.
1.2 General Information About Latin America Region and its Vegetal Diversity
1.2.1 Definition of the Term Latin America
Latin America refers to regions of the Americas extending south of the US, where Romance languages are spoken, specifically Spanish, French and Portuguese (Ardao ).
1.2.2 Latin American Countries Vegetal Diversity
Latin American region comprises six of the most biologically diverse countries in the world (Brazil, Colombia, Ecuador, Mexico, Venezuela and Peru), thus constituting one of the areas of the planet richest in biodiversity (Bovarnick et al. summarizes the number of total species of each Latin Americancountry and the number of endemisms (number of species that are unique to a region or country) which, when known, is a highly important datum.
Table 1.1
Total number of plant species that inhabit the different Latin American countries including the endemisms when known
Country
No. of spp.
No. of endemisms
Brasil
40,982
8,000
Colombia
40,000
Mxico
26,000
10,000
Venezuela
30,000
Ecuador
18,137
5,400
Bolivia
17,367
Per
13,300
5,354
Costa Rica
12,119
Cuba
11,000
6,300
Panam
10,444
1,200
Argentina
9,690
1,906
Guatemala
9,317
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