Efeitos da andiroba associada ao microagulhamento na pele de ratos / Effects of Carapa guyanensis associated to microneedling in mice skin

Introdução: O microagulhamento é uma técnica utilizada para o tratamento de cicatrizes e apresenta cada vez mais destaque na Dermatologia. Nesse contexto, em associação com o microagulhamento, drogas e ativos podem ser administrados por meio da técnica conhecida como drug delivery. Destaca-se o uso da vitamina C, por sua já comprovada ação antioxidante. Outro exemplo é a andiroba (Carapa guianensis Aubl.), por suas propriedades anti-inflamatória, analgésica, antisséptica e cicatrizante. Objetivo: Avaliar os efeitos da andiroba associada ao microagulhamento. Métodos: Foram utilizados 31 ratos machos distribuídos em cinco grupos: GPi (piloto), com três animais; GM (microagulhamento); GMA (microagulhamento + andiroba); GMV (microagulhamento + vitamina C); e GOM (microagulhamento + óleo mineral), com sete animais em cada grupo. Os animais foram submetidos à técnica do microagulhamento no D0 (dia 0) e à aplicação da substância do seu respectivo grupo, na pele, pela manhã, durante sete dias. Resultados: Houve diferença significativa entre a intensidade de proliferação fibroblástica e a vascularização observadas no tecido dos animais dos grupos GM e GMV. Já a intensidade de fibras colágenas foi superior nos animais do grupo GMV. Conclusões: O óleo de andiroba como drug delivery obteve resultados inferiores à vitamina C.

Introduction: Microneedling is a technique used to treat scars with increasing popularity in dermatology. In this context, associated to micro-needling, drugs and active substances can be administered through the technique known as drug delivery. We highlight the use of vitamin C, due to its known antioxidant properties. Another example is Carapa guianensis Aubl., due to its anti-inflammatory, analgesic, antiseptic and healing properties. Objective: To evaluate the effects of Carapa guyanensis associated to microneedling. Methods: Thirty-one male mice, distributed into five groups, were used: GPi (pilot), with three animals; GM (micro-needling); GMA (micro-needling + Carapa guyanensis); GMV (microneedling + vitamin C); and GOM (microneedling + mineral oil), with seven animals in each group. The animals were submitted to the microneedling technique on D0 (day 0) and to the application of the substance of its respective group in the skin, in the morning for seven days. Results: There was a significant difference between the expression of fibroblast proliferation and vascularization observed in the tissue of animals in groups GM and GMV. The expression of collagen fibers was superior in animals in the GMV group. Conclusions: Carapa guyanensis oil had inferior results as drug delivery when compared to vitamin C.

Efeito do óleo de copaíba associado ao microagulhamento na pele de ratos: um estudo comparativo / Effect of copaiba oil associated with microneedling on the skin of rats: a comparative study

Introdução: O microagulhamento é técnica cuja finalidade é o estímulo do colágeno, bem como de drug delivery. O óleo de copaíba apresenta efeitos cicatrizantes e anti-inflamatórios que já foram demonstrados em vários modelos animais. Objetivo: Avaliar o efeito do óleo de copaíba associado ao microagulhamento na pele de ratos. Métodos: Foram utilizados 30 ratos distribuídos em seis grupos com cinco animais cada, submetidos a: microagulhamento isolado, microagulhamento associado a óleo mineral e microagulhamento associado a óleo de copaíba. Foram realizadas biópsias em todos os animais 14 dias e 30 dias após. Os parâmetros avaliados foram presença de colágeno, fibroblastos e vasos, classificada em ausente (0), leve (1), moderada (2) ou intensa (3). Resultados: Houve diferença estatisticamente significante entre os grupos em relação ao colágeno com 14 (p = 0,0091) e 30 dias (p = 0,0357) e fibroblastos com 30 dias (p = 0,0357). O grupo que utilizou microagulhamento e óleo de copaíba, apresentou, após 30 dias, maior produção de colágeno e de fibroblastos. Conclusões: o óleo de copaíba associado ao microagulhamento foi capaz de estimular maior produção de colágeno e de fibroblastos na pele de ratos.

Introduction: Microneedling is a technique aiming at stimulating the production of collagen as well as serving as drug delivery. Copaiba oil has healing and anti-inflammatory effects that have already been demonstrated in several animal models. Objective: To evaluate the effect of copaiba oil associated with microneedle removal on the skin of rats. Methods: Thirty rats were distributed in six groups of five animals each, subsequently undergoing: isolated microneedling, microneedling associated to mineral oil, and microneedling associated with copaiba oil. Biopsies were carried out in all animals at 14 and 30 days after the procedure. The parameters evaluated were: presence of collagen, fibroblasts and vessels, according to the following ratings: absence (0), mild (1), moderated (2) or intense (3). Results: There was a statistically significant difference between the groups regarding the production of collagen at 14 days (p = 0.0091) and 30 days (p = 0.0357); and fibroblasts at 30 days (p = 0.0357). the group that used microneedling and copaiba oil, presented, after 30 days, a greater production of collagen and fibroblasts. Conclusions: Copaiba oil associated with microneedling was capable of stimulating a greater production of collagen and fibroblasts in the skin of rats.

Remote ischemic conditioning temporarily improves antioxidant defense.

BACKGROUND: Remote ischemic conditioning (RIC) is the most promising surgical approach to mitigate ischemia and reperfusion (IR) injury. It consists in performing brief cycles of IR in tissues other than those exposed to ischemia. The underlying mechanisms of the induced protection are barely understood, so we evaluated if RIC works enhancing the antioxidant defense of the liver and kidney before IR injury. MATERIALS AND METHODS: Twenty-one Wistar rats were assigned into three groups as follows: sham, same surgical procedure as in the remaining groups was performed, but no RIC was carried out. RIC 10, RIC was performed, and no abdominal organ ischemia was induced. After 10 min of the end of the RIC protocol, the liver and kidney were harvested. RIC 60, similar procedure as performed in RIC 10, but the liver and the kidney were harvested 60 min. RIC consisted of three cycles of 5-min left hind limb ischemia followed by 5-min left hind limb perfusion, lasting 30 min in total. Samples were used to measure tissue total antioxidant capacity. RESULTS: RIC protocol increased both liver (1.064 ± 0.26 mM/L) and kidney (1.310 ± 0.17 mM/L) antioxidant capacity after 10 min when compared with sham (liver, 0.759 ± 0.10 mM/L and kidney, 1.08 ± 0.15 mM/L). Sixty minutes after the RIC protocol, no enhancement on liver (0.687 ± 0.13 mM/L) or kidney (1.09 ± 0.15 mM/L) antioxidant capacity was detected. CONCLUSIONS: RIC works through temporary and short-term enhancement of liver and kidney cells antioxidant defenses to avoid the deleterious consequences of a future IR injury.