Wounds In Wistar Rats Research Articles

Infected wound healing and antimicrobial effects of Chenopodium ambrosioides and Mitracarpus scaber

Chenopodium ambrosioides Linn. (Chenopdiaceae) and Mitracarpus scaber Zucc. (Rubiaceae) are herbal medicinal plants. They are commonly used in Togolese folk medicine to treat skin infections such as infected wounds, dermatoses, and scabies. The aim of this work was to evaluate the wound healing and antimicrobial properties of the two plants. Firstly, we evaluated the infected wound healing property of the two plants. We induced and treated infected wound in Wistar rats as follows. We inserted a sterile needle under the skin of the animal previously anesthetized by ether. Along the needle, we made an incision of 2 cm of length. The wound was infected with 24 hours colonies of P.aeruginosa . One infected wound was created per animal. 0.5 g of ointments prepared form C. ambrosioides and M. scabe r leaf extracts, was applied twice a day. Secondly, we conducted antimicrobial assays with extracts prepared with the leaves of the plants. Staphylococcus aureus, Pseudomonas aeruginosa, Candida albcans, Escherichia coli and Salmonella sp. were used in this study. Infected wound in control group healed in 12.6±0.245 days. The ointment from C. ambrosioides or M. scaber leaf extracts, significantly and respectively reduced this mean time to 07.04±0.245 (P C. ambrosioides and M. scaber possess wound healing and antimicrobial properties. These findings support their traditional use in treatment of skin infections. Keywords: antimicrobial activity, Chenopodium ambrosioides, Mitracarpus scabe r, ointments, skin infected wounds.

In vivoWound Healing Activity of the Methanolic Extract and its Isolated Constituent, Gulonic Acid γ-Lactone, Obtained fromGrewia tiliaefolia

Grewia tiliaefolia is a subtropical tree, its stem bark is widely used in traditional Indian medicines to heal chronic wounds, gastric ulcers, burning sensation, itching and other allergic ailments. Bioassay-directed fractionation and chromatography of the methanolic extract of G. tiliaefolia stem bark has resulted in the isolation of gulonic acid gamma-lactone. The methanolic extract and the isolated constituent were studied for their potency on three different cutaneous wound models, VIZ., excision, incision and dead space wounds in Wistar rats. In the excision wound model, healing was assessed by the rate of wound contraction and period of epithelisation. In the incision wound model, the degree of healing was analysed by determining the skin breaking strength. In the dead space wound model, the parameters used to confirm the healing process were weight of granulation tissue, its tensile strength, hydroxyproline content and histological studies. The extract as well as the constituent demonstrated wound healing activity. Topical application of gulonic acid gamma-lactone (0.2% w/w ointment) caused faster epithelialisation with 94.02% wound contraction on day 16 post-wounding, while in control animals the duration of healing was extended up to 22 days with 79.53% wound contraction. The tensile strength of the incision wound was significantly increased (561.12 +/- 5.18 g) compared to the control (327.63 +/- 6.37 g). In the dead space wound model, a significant increase in weight, tensile strength and hydroxyproline content of the granuloma tissue was observed following oral administration of gulonic acid gamma-lactone (60 mg/kg). Histology of the granuloma tissue showed increased collagenation and the absence of monocytes. The wound healing effect was compared with that of the standard skin ointment nitrofurazone. The results of this investigation provide supportive scientific evidence for the medicinal use of G. tiliaefolia for healing of cutaneous wound.

Protective Role Of Sphaeranthus Amaranthoides Extract On Dermal Wounds In Wistar Rats

The healing potential of ethanolic extract of aerial parts of Sphaeranthus amaranthoides, Linn. (Asteraceae) (SAE) for treatment of dermal wounds in wistar rats was studied on excision wound models. Various parameters studied are epithelization and wound contraction. The extract was applied in thedorsal thoracic region of six excised wounded models once in a day for 16 days. The results obtained indicate that Sphaeranthus amaranthoides accelerates the wound healing process by decreasing the surface area of wound. Framycetin sulphate was used as positive control complete epithelization was observed within 16 days with Sphaeranthus amaranthoides The extract significantly enhanced the rate of wound contraction and the period of epithelialization comparable to framycetin sulfate.

Efeito cicatrizante e atividade antibacteriana da Calendula officinalis L. cultivada no Brasil

Desde a antiguidade propriedades medicinais são atribuídas às flores da Calendula officinalis L. (Asteraceae) destacando-se a atividade cicatrizante. Estudos sobre a atividade geral de plantas medicinais na cicatrização vêm sendo realizados, sem especificar sobre qual das fases da cicatrização a planta atua. Neste trabalho a atividade cicatrizante e antiinflamatória do extrato etanólico das flores da C. officinalis cultivada no Brasil foi avaliada em feridas cutâneas de ratos Wistar, por meio de avaliação macroscópica e histológica. A atividade antimicrobiana do extrato e das frações hexânica e diclorometano também foi avaliada. A atividade antiinflamatória do extrato etanólico da calêndula foi atribuída à diminuição da exsudação serosa, da hiperemia, da deposição de fibrina e da hiperplasia epidermal, além de resultar em crostas mais delgadas e umedecidas. Observaram-se também aumento de colágeno no tecido de granulação e efeito antibacteriano. Assim, o extrato etanólico da calêndula atuou de forma positiva sobre a atividade cicatricial em feridas cutâneas de ratos, bem como apresentou atividade antibacteriana in vitro.