Revealing Insights into Natural Products Against mcr-1-Producing Bacteria.

Bacterial resistance has become a major global concern, affecting about 500, 000 individuals in 22 countries. Thus, it is clear that Gram-negative bacteria have been receiving more attention in this scenario. These bacteria perform several resistance mechanisms, such as modifying lipid A from lipopolysaccharides as a product of the mcr-1 gene expression. This gene was initially identified in animals; however, it quickly spread to humans, spreading to 70 countries. Mcr-1 gene attributes resistance to polymyxin B and colistin, which are drugs established as the last alternative to combat Enterobacteriaceae bacteria. Notwithstanding the prevalence and lack of antibiotic therapies for such bacteria, this article aimed to compile information about natural compounds against the resistance attributed by this gene, including the activity of isolated colistin or its associations with other antibiotics. Among the studies that evaluated colistin's synergistic action with other compounds, azidothymidine and isoalantholactone stood out. On the other hand, the paenipeptin 1 analog showed satisfactory activities when associated with other antibiotics. Besides, it is worth mentioning that molecular docking results between ostole and eugenol toward phosphoethanolamine transferase MCR-1 revealed that these compounds could interact with critical amino acid residues for the catalytic action of this enzyme. Based on this, natural agents' role is evident against infections caused by mcr-1-positive bacteria, directly contributing to the development of new effective pharmacotherapies.

Esporotricose pulmonar: relato de caso / Pulmonay sporotrichosis: a case report

Os autores relatam o caso de um homem de 49 anos, com quadro de síndrome consumptiva e múltiplas cavitações pulmonares há cinco anos. Foi tratado para tuberculose, em duas ocasiões, sem melhora da sintomatologia. O paciente foi internado com quadro de dispnéia em repouso e febre, sendo sua cultura de escarro positiva para Sporothrix schenckii. O objetivo deste trabalho é apresentar uma forma rara de esporotricose e ressaltar a importância de seu reconhecimento.

A 49 year-old white man was admitted with dyspnea, cough and fever, with a history of consumptive syndrome and pulmonary cavitary disease for the past five years. He was treated twice for pulmonary tuberculosis previously, but without responses. His sputum culture was positive for Sporothrix schenckii. The ocurrence of sporotrichosis as a disease of the lung without cutaneos involvement is rare. So the subject of this report is to describe a case of pulmonary sporotrichosis and show the importance of its recognition.