scholarly journals Desenvolvimento de um modelo murino de colonização nasal por Staphylococcus aureus / Development of a murine model of nasal colonization by Staphylococcus aureus

2021 ◽  
Vol 4 (4) ◽  
pp. 6288-6294
Author(s):  
Rodrigo Müller ◽  
Natália Plínio de Souza ◽  
Lisiane dos Santos Lagêdo ◽  
Fernanda Rimolli de Castro Araújo ◽  
José Procópio Moreno Senna

O desenvolvimento de novas drogas e vacinas contra doenças humanas passa, na maioria das vezes, por ensaios prévios em modelos animais. Staphylococcus aureus é um patógeno causador de infecções graves, muitas vezes resistentes aos antimicrobianos. Grande parte da população é portadora nasal desta bactéria. O desenvolvimento de estratégias para descolonização nasal necessita de modelos animais para a realização de estudos preliminares. O presente trabalho tem por finalidade demonstrar a adaptação do protocolo de González-Zorn as condições locais do modelo de colonização nasal por S. aureus em camundongos balb/C. Neste estudo, os animais foram inoculados pela via nasal com 108 bactérias, sendo submetidos a eutanásia no terceiro e sexto dia. Observou-se uma recuperação media de 104 (19.100) e 102 (180) bactérias, nos dias 3 e 6 respectivamente. O modelo avaliado mostrou-se ideal para utilização em estudos preliminares, visando avaliar a colonização nasal por S.aureus em modelo murino.

Medicines ◽  
2018 ◽  
Vol 5 (3) ◽  
pp. 83 ◽  
Author(s):  
Masaaki Minami ◽  
Toru Konishi ◽  
Toshiaki Makino

Background: Methicillin-resistant Staphylococcus aureus (MRSA) infections are largely preceded by colonization with MRSA. Hochuekkito is the formula composing 10 herbal medicines in traditional Kampo medicine to treat infirmity and to stimulate immune functions. We evaluated the efficacy of hochuekkito extract (HET) against MRSA colonization using a nasal infection murine model. Methods: We evaluated the effects of HET as follows: (1) the growth inhibition by measuring turbidity of bacterial culture in vitro, (2) the nasal colonization of MRSA by measuring bacterial counts, and (3) the splenocyte proliferation in mice orally treated with HET by the 3H-thymidine uptake assay. Results: HET significant inhibited the growth of MRSA. The colony forming unit (CFU) in the nasal fluid of HET-treated mice was significantly lower than that of HET-untreated mice. When each single crude drug—Astragali radix, Bupleuri radix, Zingiberis rhizoma, and Cimicifugae rhizome—was removed from hochuekkito formula, the effect of the formula significantly weakened. The uptake of 3H-thymidine into murine splenocytes treated with HET was significantly higher than that from untreated mice. The effects of the modified formula described above were also significantly weaker than those of the original formula. Conclusions: Hochuekkito is effective for the treatment of MRSA nasal colonization in the murine model. We suggest HET as the therapeutic candidate for effective therapy on nasal cavity colonization of MRSA in humans.


2008 ◽  
Vol 190 (7) ◽  
pp. 2275-2278 ◽  
Author(s):  
Bonggoo Park ◽  
Victor Nizet ◽  
George Y. Liu

ABSTRACT Nasal colonization by Staphylococcus aureus is a major predisposing factor for subsequent infection. Recent reports of increased S. aureus colonization among children receiving pneumococcal vaccine implicate Streptococcus pneumoniae as an important competitor for the same niche. Since S. pneumoniae uses H2O2 to kill competing bacteria, we hypothesized that oxidant defense could play a significant role in promoting S. aureus colonization of the nasal mucosa. Using targeted mutagenesis, we showed that S. aureus expression of catalase contributes significantly to the survival of this pathogen in the presence of S. pneumoniae both in vitro and in a murine model of nasal cocolonization.


2007 ◽  
Vol 144 (3) ◽  
pp. 183-196 ◽  
Author(s):  
Karina Gisch ◽  
Nadine Gehrke ◽  
Matthias Bros ◽  
Christina Priesmeyer ◽  
Jürgen Knop ◽  
...  

Vaccine ◽  
2015 ◽  
Vol 33 (41) ◽  
pp. 5452-5457 ◽  
Author(s):  
Ingrid L. Scully ◽  
Yekaterina Timofeyeva ◽  
David Keeney ◽  
Yury V. Matsuka ◽  
Elena Severina ◽  
...  

2011 ◽  
Vol 60 (6) ◽  
pp. 812-816 ◽  
Author(s):  
Alexander L. A. Bloemendaal ◽  
Menno R. Vriens ◽  
Wouter T. M. Jansen ◽  
Inne H. M. Borel Rinkes ◽  
Jan Verhoef ◽  
...  

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