Kalanchoe laciniata and Bryophyllum pinnatum: an updated review about ethnopharmacology, phytochemistry, pharmacology and toxicology

Abstract The species Kalanchoe laciniata (L.) DC. and Bryophyllum pinnatum (Lam) Pers. are native from Brazil and Madagascar, respectively. Both belonging to the Crassulaceae family and being widely used by population as a natural anti-inflammatory agent. These species have similar leaf morphology and for this reason, they are known by the same popular name as " saião " or " coirama ". Several studies have been published involving different parts and preparations of these species. Therefore, this review aims to provide an update overview about the traditional uses, chemical constitution, pharmacology and toxicology of K. laciniata and B. pinnatum species. An extensive literature review was conducted in different scientific databases. Various chemical constituents have been identified in extracts from different parts of K. laciniata and B. pinnatum , being flavonoids the major compounds. They have been traditionally used to treat inflammation, microbial infection, pain, respiratory diseases, gastritis, ulcers, diabetes and cancer tumors. Non-clinical in vitro assays evaluated mainly the antimicrobial and antioxidant activities, while in vivo assays evaluated the leishmanicide, anti-inflammatory and immunomodulatory activities. Regarding toxicity, few studies have been conducted for the two species. The information reported in this work might contribute to the recognition of the importance of K. laciniata and B. pinnatum species, as well as to direct further studies. (AU)

Nature as a source of drugs for ophthalmology / Natureza como fonte de drogas para oftalmologia

ABSTRACT Nature has always provided an unlimited source of biologically-active compounds. Since the beginning of mankind, humans have sought resources in fauna and flora to treat eye diseases. However, it was only after the Industrial Revolution that extracts of plants and substances of animal origin could be used safely, as has been determined by controlled interventional studies. Two major challenges faced by ocular pharmacology are the following: developing drugs that are able to reduce blindness due to glaucoma; and controlling the pain associated with eye surgery. The search for a drug that effectively lowers intraocular pressure and controls the progression of glaucoma has led to the development of various ocular hypotensive agents, such as physostigmine from the Physostigma venenosum plant. The anesthetic properties of cocaine, extracted from Erythroxylon coca, finally enabled surgical procedures in the eye. Several new natural compounds have been investigated in an attempt to identify substances with the potential to provide additional benefits to eye tissue and vision. Emerging evidence of anti-inflammatory, wound-healing, antimicrobial, antioxidant, antitumor, and antiangiogenic properties attributed to plant extracts and animal tissues has encouraged more investment in research in this area. Despite technological advances in synthesizing drugs, the pharmaceutical industry still seeks new active compounds from natural sources as well as from revisiting already-established naturally derived compounds. Although a large number of naturally-occurring compounds is known, this review article focuses on the bioactive substances with scientifically-proven benefits for ocular tissues.

RESUMO A natureza sempre se forneceu uma fonte inesgotável compostos biologicamente ativos. Desde o início da humanidade, os homens buscaram recursos na fauna e flora para tratar as doenças oculares. Porém, foi somente após a Revolução Industrial que extratos de plantas e substâncias de origem animal puderam ser utilizados com segurança, como foi determinado por estudos controlados de intervenção. Dois grandes desafios enfrentados pela farmacologia foram: desenvolver drogas capazes de reduzir a cegueira pelo glaucoma; e controlar a dor associada à cirurgia ocular. A busca por uma droga que efetivamente reduza a pressão intraocular e controle a progressão do glaucoma levou ao desenvolvimento de diversos hipotensores oculares, como a physostigmine da planta Physostigma venenosum. As propriedades anestésicas da cocaína, extraídas da Erythroxylon coca, finalmente permitiram procedimentos cirúrgicos no olho. Vários novos compostos naturais foram investigados na tentativa de identificar substâncias com potencial para fornecer benefícios adicionais ao tecido ocular e à visão. Evidências emergentes de propriedades anti-inflamatórias, de cicatrização de feridas, antimicrobianas, antioxidantes, antitumorais e antiangiogênicas atribuídas a extratos de plantas e tecidos animais estimularam mais investimentos em pesquisas nessa área. Apesar dos avanços tecnológicos na síntese de drogas, a indústria farmacêutica ainda busca novos princípios ativos a partir de fontes naturais, bem como revisita drogas derivadas já estabelecidas. Embora um grande número de compostos que ocorrem naturalmente seja conhecido, este artigo de revisão concentra-se nas substâncias bioativas com benefícios cientificamente comprovados para os tecidos oculares.

Expansion and phenotypic changes of mouse bone marrow mesenchymal cells cultured with FGF-2 and facial nerve-conditioned medium / Expansión y cambios fenotípicos de células mesenquimales de médula ósea de ratón cultivadas con FGF-2 y medio condicionado por el nervio facial

Mesenchymal cells (MCs) exhibit great regenerative potential due to their intrinsic properties and ability to restore tissue function, either directly through transdifferentiation or indirectly through paracrine effects. This study aimed to evaluate morphometric and phenotypic changes in MCs grown with facial nerve-conditioned medium in the presence or absence of fibroblast growth factor 2 (FGF-2). For quantitative phenotypic analysis, the expression of GFAP, OX-42, MAP-2, β-tubulin III, NeuN, and NF-200 was analyzed by immunocytochemistry. Cells cultured with facial nerve-conditioned medium in the presence of FGF-2 expressed GFAP, OX-42, MAP-2, β-tubulin III, NeuN, and NF-200. On average, the area and perimeter of GFAP-positive cells were higher in the group cultured with facial nerve-conditioned medium compared to the group cultured with conditioned medium and FGF-2 (p=0.0001). This study demonstrated the plasticity of MCs for neuronal and glial lineages and opens up new research perspectives in cell therapy and trans.differentiation.

Las células mesenquimales (CM) exhiben un gran potencial regenerativo debido a sus propiedades intrínsecas y la capacidad de restaurar la función del tejido, ya sea directamente, a través de la transdiferenciación, o indirectamente, a través de efectos parácrinos. Este estudio tuvo como objetivo evaluar los cambios morfométricos y fenotípicos en CM cultivadas con medio condicionado por nervio facial en presencia o ausencia de factor de crecimiento de fibroblastos 2 (FGF-2). Para el análisis fenotípico cuantitativo, se analizó la expresión de GFAP, OX-42, MAP-2, β-tubulina III, NeuN y NF-200 mediante inmunocitoquímica. Las células cultivadas con medio condicionado por el nervio facial en presencia de FGF-2 expresaban GFAP, OX-42, MAP-2, β-tubulina III, NeuN y NF-200. En promedio, el área y el perímetro de las células positivas para GFAP fueron mayores en el grupo cultivado con medio condicionado por el nervio facial en comparación con el grupo cultivado con medio acondicionado y FGF-2 (p = 0,0001). Este estudio demostró la plasticidad de CM para linajes neuronales y gliales y abre nuevas perspectivas de investigación en terapia celular y transdiferenciación.

Evaluation of chitosan gel with 1 percent silver sulfadiazine as an alternative for burn wound treatment in rats / Avaliação do gel de quitosana contendo sulfadiazina de prata 1 por cento como alternativa para o tratamento de queimaduras em ratos

PURPOSE: Evaluation of the rheological, biological and therapeutic properties of a new topical formulation consisting of chitosan gel containing 1 percent silver sulfadiazine, as an alternative for the treatment of burn wounds. METHODS: An experimental study was done with 21 Wistar rats divided into three groups. Group I was treated with chitosan gel without the antimicrobial, group II was treated with chitosan gel with 1 percent silver sulfadiazine and group III was treated with commercially available 1 percent silver sulfadiazine cream. RESULTS: Due to its pseudoplastic characteristic and good bioadhesiveness, the chitosan gels showed a satisfactory retention time over the wounds. No statistical difference was found in the amount of drug released from the chitosan gel and commercially available cream, as well as in the healing time among the groups. Wounds treated with chitosan gel with silver sulfadiazine showed a higher fibroblast production and a better angiogenesis than in the other groups, which are important parameters on the evolution of the healing process. CONCLUSION: The topical use of chitosan gel in association with silver sulfadiazine ameliorated the neovascularization and inflammatory reaction in burn wounds. This new formulation showed advantageous rheological properties and efficient release of the drug.

OBJETIVO: Avaliar as propriedades reológicas, biológicas e terapêuticas de uma nova formulação de uso tópico, a partir de um gel de quitosana, contendo sulfadiazina de prata a 1 por cento, no tratamento de queimaduras. MÉTODOS: Foi realizado estudo experimental com 21 ratos Wistar distribuídos em três grupos de sete animais. As queimaduras dos animais do grupo I foram tratadas com gel de quitosana sem antimicrobiano, o grupo II foi tratado com gel de quitosana contendo sulfadiazina de prata 1 por cento e o grupo III foi tratado com creme de sulfadiazina de prata 1 por cento, comumente utilizado no tratamento de queimados. RESULTADOS: Devido às características pseudoplásticas e à boa bioadesividade, os géis de quitosana apresentaram um tempo de retenção satisfatório sobre as feridas. A liberação da sulfadiazina de prata, bem como o tempo de cicatrização, não foram estatisticamente diferentes. Feridas tratadas com o gel de quitosana contendo sulfadiazina de prata apresentaram uma maior produção de fibroblastos e uma melhor angiogênese, comparando-se com os outros grupos, fatores que indicaram uma maior evolução no processo de cicatrização. CONCLUSÃO: O uso tópico do gel de quitosana com sulfadiazina de prata a 1 por cento melhorou a neovascularização e a reação inflamatória em queimaduras e essa nova formulação mostrou boas propriedades reológicas associadas a eficiente liberação do fármaco.