Universidade Federal da Bahia, Campus Anísio Teixeira, Instituto Multidisciplinar Em Saúde, Rua Hormindo Barros, 58, Bairro Candeias, Vitória da Conquista, Bahia, CEP: 45.029-094, Brazil.
Universidade Federal Do Sul da Bahia, Campus Paulo Freire, 250 Praça Joana Angélica, Bairro São José, Teixeira de Freitas, Bahia, 45.988-058, Brazil.
Photochem Photobiol Sci. 2024 Mar;23(3):561-573. doi: 10.1007/s43630-024-00539-0. Epub 2024 Feb 19.
Methicillin-resistant Staphylococcus aureus (MRSA) is one of the leading causes of skin and soft tissue infections worldwide. This microorganism has a wide range of antibiotics resistance, a fact that has made the treatment of infections caused by MRSA difficult. In this sense, antimicrobial photodynamic therapy (aPDT) with natural products has emerged as a good alternative in combating infections caused by antibiotic-resistant microorganisms. The objective of the present study was to evaluate the effects of aPDT with Brazilian green propolis against intradermal MRSA infection in a murine model. Initially, 24 Balb/c mice were infected intradermally in the ears with 1.5 × 10 colony-forming units of MRSA 43300. After infection, they were separated into 4 groups (6 animals per group) and treated with the vehicle, only Brazilian green propolis, only blue LED light or with the aPDT protocol (Brazilian green propolis + blue LED light). It was observed in this study that aPDT with Brazilian green propolis reduced the bacterial load at the site of infection. Furthermore, it was able to inhibit weight loss resulting from the infection, as well as modulate the inflammatory response through greater recruitment of polymorphonuclear cells/neutrophils to the infected tissue. Finally, aPDT induced an increase in the cytokines IL-17A and IL-12p70 in the draining retromaxillary lymph node. Thus, aPDT with Brazilian green propolis proved to be effective against intradermal MRSA infection in mice, reducing bacterial load and modulating the immune response in the animals. However, more studies are needed to assess whether such effects are repeated in humans.
耐甲氧西林金黄色葡萄球菌(MRSA)是全球范围内导致皮肤和软组织感染的主要原因之一。这种微生物具有广泛的抗生素耐药性,这使得治疗由 MRSA 引起的感染变得困难。在这种情况下,天然产物的抗菌光动力疗法(aPDT)已成为对抗抗生素耐药微生物引起的感染的一种很好的选择。本研究的目的是评估巴西绿蜂胶的 aPDT 对小鼠皮肤内 MRSA 感染的影响。最初,将 24 只 Balb/c 小鼠的耳朵皮内用 1.5×10 个 CFU 的 MRSA 43300 感染。感染后,将它们分为 4 组(每组 6 只动物),分别用载体、巴西绿蜂胶、仅蓝光 LED 光或 aPDT 方案(巴西绿蜂胶+蓝光 LED 光)治疗。研究中观察到,巴西绿蜂胶的 aPDT 降低了感染部位的细菌负荷。此外,它能够抑制感染引起的体重减轻,并通过向感染组织募集更多的多形核细胞/中性粒细胞来调节炎症反应。最后,aPDT 诱导引流颈后淋巴结中细胞因子 IL-17A 和 IL-12p70 的增加。因此,巴西绿蜂胶的 aPDT 被证明对小鼠皮肤内的 MRSA 感染有效,降低了细菌负荷并调节了动物的免疫反应。然而,需要更多的研究来评估这些效应是否在人类中重复出现。
Photodiagnosis Photodyn Ther. 2020-6
Toxins (Basel). 2022-7-6
Front Cell Infect Microbiol. 2021-2-12
Virulence. 2021-12