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Southern African Medicinal Plants Used to Treat Skin Diseases

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Southern African Medicinal Plants Used to Treat Skin Diseases South African Journal of Botany 87 (2013) 175–193 Contents lists available at SciVerse ScienceDirect South African Journal of Botany journal homepage: www.elsevier.com/locate/sajb Review Southern African medicinal plants used to treat skin diseases U. Mabona, S.F. Van Vuuren ⁎ Department of Pharmacy and Pharmacology, University of the Witwatersrand, 7 York Road, Parktown, 2193, South Africa article info abstract Article history: This overview of southern African medicinal plants of dermatological relevance explores the fundamental Received 18 February 2013 knowledge available on the antimicrobial, anti-inflammatory, and wound healing properties of medicinal Received in revised form 8 April 2013 plants used to treat skin ailments. Also included is an overview undertaken on the phytochemistry and tox- Accepted 11 April 2013 icity of plants used in treatments related to diseases of the skin. Some findings include the predominance of Available online 23 May 2013 leaf material used (48%), as well as the frequent use of decoctions (35%). Dermatological skin pathogens such fl Edited by J Van Staden as Propionibacterium acnes, Microsporum canis, Trichophyton mentagrophytes and Epidermophyton occosum are recommended for study in future antimicrobial research. Attention to these aspects should lead to new Keywords: directives for commercialization and provide insight towards the understanding of some neglected plant Antimicrobial species used for the treatment of skin diseases. Dermatophytes © 2013 SAAB. Published by Elsevier B.V. All rights reserved. Interactions Skin Medicinal plants Toxicity Wound healing Contents 1. Introduction ............................................................. 175 2. Wound healing effects of medicinal plants used to treat skin ailments .................................. 176 3. Anti-inflammatory effects of medicinal plants used to treat skin ailments ................................. 176 4. Overview of other non-infectious skin conditions ............................................ 179 5. Infections of the skin ......................................................... 181 5.1. Antimicrobial properties of medicinal plants against skin relevant pathogens ............................ 182 6. Plant parts used to treat skin diseases ................................................. 184 7. Method of preparation and mode of administration ........................................... 184 8. Combined preparations used to treat skin inflictions .......................................... 186 9. Pharmaceutical applications ...................................................... 186 10. Toxicity effects of medicinal plants used to treat skin ailments ...................................... 186 11. Phytochemistry investigations ..................................................... 189 12. Recommendations and conclusions .................................................. 190 Acknowledgements ............................................................. 190 References ................................................................. 190 1. Introduction medicinal plants to treat skin infections is very common in many rural areas (Naidoo and Coopoosamy, 2011). If one considers the im- According to the World Health Organization (WHO, 2011) about plications of skin infections, which tend to be persistent, in many 70–95% of the world's population in developing countries relies cases contagious and often associated with immunocompromised pa- mainly on plants for their primary health care. Traditional medicine tients, it is not surprising that traditional medicine has become the has not only gained popularity and approval, but it is sometimes the first treatment of choice. Medicinal plants are highly sought after to only system available in many rural areas. Furthermore, the use of treat dermatological ailments due to their (perceived?) ability to stop bleeding, speed up wound healing, as treatments for burns and ⁎ Corresponding author. Tel.: +27 11 7172157; fax: +27 11 6424355. to alleviate other skin conditions (Naidoo and Coopoosamy, 2011). E-mail address: [email protected] (S.F. Van Vuuren). Furthermore, the increased demand for cheaper medicines, high 0254-6299/$ – see front matter © 2013 SAAB. Published by Elsevier B.V. All rights reserved. http://dx.doi.org/10.1016/j.sajb.2013.04.002 176 U. Mabona, S.F. Van Vuuren / South African Journal of Botany 87 (2013) 175–193 rates of unemployment and greater incidences of infection from healing and anti-infective applications are all closely related. Differ- the human immunodeficiency virus/acquired immunodeficiency syn- ent compounds within a plant may possibly result in different healing drome (HIV/AIDS) make the purchase of traditional medicines sold in strategies. Furthermore, these plants could be used to treat inflictions the informal market place a more attractive option. These treatment to the skin as a result of insect or snake bites. Tables 1–9 provide a regimens are less expensive, freely available and the use is based on more in-depth analysis of the specific plants used for each skin condi- extensive knowledge and expertise amongst the local communities tion, their healing properties, parts of the plants used and the respec- (Shai et al., 2008; Street et al., 2008). tive modes of administration. More specifically, in southern Africa, research on medicinal plants used for dermatological inflictions has not been given the 2. Wound healing effects of medicinal plants used to treat attention it so rightly deserves. This is surprising as many plant spe- skin ailments cies (e.g. Centella asiatica, Harpagophytum procumbens, Lobostemon fruticosus, Trichilia emetica, Warburgia salutaris, Withania somnifera The majority of plants used traditionally for dermatological pur- and Xysmalobium undulatum), which have been targeted for commer- poses are related to wound healing (Table 1). The use for sores or ul- cialization (George et al., 2001; Van Wyk, 2008a,b; Vermaak et al., cers (Table 2) are also of importance but to a lesser extent. Addressing 2011), have not been adequately studied. In-depth phytochemistry, some studies where attention has been given to validating wound toxicity and pharmacological efficacy for many of these plants are healing potential, are the examination of medicinal plants such as still lacking. Medicinal plants used for dermatological purposes, Cissus quadrangularis, Grewia occidentalis, Gunnera perpensa, Malva both traditionally and in the cosmetic industry, are gaining more parvifolia, Ricinus communis and Terminalia sericea, taking into account value, as many skincare products are now being supplemented with the possible impact of bacterial infection (Grierson and Afolayan, plant extracts (for example, the African extracts™ Rooibos body care 1999; Steenkamp et al., 2004; Luseba et al., 2007). In addition to this, a products (http://www.africanextracts.com/) and Elixir™ skin care prod- study by Pather et al. (2011) also identified the in vivo wound healing ucts which contain Aloe ferox (http://www.elixirskincare.com/). properties of Bulbine frutescens and Bulbine natalensis on pigs, where Keeping this in mind, it has now become important, while exam- the leaf gel extracts of the plants showed notable effects. Other studies ining the ethnobotanical literature (Watt and Breyer-Brandwijk, further afield, such as the study by Dahanukar et al. (2000) on the phar- 1962; Hutchings, 1996; Von Koenen, 1996; Felhaber, 1997; Rabe macology of medicinal plants and natural products from India details the and Van Staden, 1997; Van Wyk et al., 2000, 2009), to identify gaps wound healing effects of aqueous extracts of latex from Euphorbia in research directed at plants of dermatological importance so that neriifolia (Nivadung) topically applied to surgical wounds on guinea further commercialization directives can be based on a firm ground- pigs. In addition, the study focuses on the wound healing effects of or- ing of basic research. ganic extracts (alcoholic, petroleum ether, chloroform, propylene glycol Upon further examination of the available ethnobotanical litera- and glycosidal) of Centenella asiatica used topically in various formula- ture, over 100 plant species were identified as being of importance tions (ointments, creams and gels) to treat open wounds on rat models when considering the traditional dermatological medicinal plant use where the gel formulation shows prominent activity. Furthermore, the in southern Africa. An overview of the uses related to the skin is wound healing effects of four other plants extracts on both immuno- given in Fig. 1. Wound healing was the most prevalent (41%) treat- compromised and healthy rats i.e. Aloe vera (leaves); Aegle marmelos ment regimen, followed by infectious diseases (32%). These may and Moringa oleifera (root and root bark) and leaves of Tridax procumbes comprise of bacterial (e.g. acne, boils, abscesses and leprosy), fungal were undertaken (Dahanukar et al., 2000). Studies such as these are (e.g. ringworm) or viral (e.g. shingles and measles) to a lesser extent. lacking on southern African plant species. Some medicinal plants (25%) are indicated for the treatment of sores and ulcers (kept separate from wound healing due to the implications 3. Anti-inflammatory effects of medicinal plants used to treat of severity). Skin irritations including rashes, eczema, psoriasis, skin ailments cancer and tumours account for 16% of southern African medicinal plants. Less attention has been given to plants used for the treatment
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