Growth inhibition of phytopathogenic spiroplasmas by membrane‐interactive antimicrobial peptides Novispirin T7 and Caerin 1.1

2021 ◽  
Author(s):  
Wei Wei ◽  
Robert E. Davis ◽  
Joseph D. Mowery ◽  
Yan Zhao
Keyword(s):  
Antimicrobial Peptides ◽  
Growth Inhibition ◽  
Membrane Interactive

Antimicrobial Activity of Different Antimicrobial Peptides (AMPs) Against Clinical Methicillin-resistant Staphylococcus aureus (MRSA)

2019 ◽  
Vol 18 (24) ◽  
pp. 2116-2126 ◽  
Author(s):  
Eleonora Ciandrini ◽  
Gianluca Morroni ◽  
Daniela Arzeni ◽  
Wojciech Kamysz ◽  
Damian Neubauer ◽  
...  
Keyword(s):  
Staphylococcus Aureus ◽  
Antimicrobial Activity ◽  
Antimicrobial Peptides ◽  
Growth Inhibition ◽  
Methicillin Resistant Staphylococcus Aureus ◽  
Clinical Isolates ◽  
Methicillin Resistant ◽  
Time Kill ◽  
Citropin 1.1 ◽  
Temporin A

Background: Antimicrobial research is being focused to look for more effective therapeutics against antibiotic-resistant infections caused by methicillin-resistant Staphylococcus aureus (MRSA). In this direction, antimicrobial peptides (AMP) appear as promising tool. Objectives: This study evaluated the antimicrobial activity of different AMPs (Citropin 1.1, Temporin A, Pexiganan, CA(1–7)M(2–9)NH2, Pal-KGK-NH2, Pal-KKKK-NH2, LL-37) against human MRSA clinical isolates. Methods: The Minimum Inhibitory Concentration (MIC) was assessed for each AMP; then, the most active ones (Citropin 1.1, Temporin A, CA(1–7)M(2–9)NH2 and Pal-KGK-NH2) were tested against selected MRSA strains by time-kill studies. Results: The lowest MIC value was observed for Pal-KGK-NH2 (1 µg/ml), followed by Temporin A (4- 16 µg/ml), CA(1–7)M(2–9)NH2 (8-16 µg/ml) and Citropin 1.1 (16-64 µg/ml), while higher MICs were evidenced for LL-37, Pexiganan and Pal-KKKK-NH2 (> 128 µg/ml). In time-kill experiments, Citropin 1.1 and CA(1-7)M(2-9)NH2 showed a relatively high percentage of growth inhibition (>30 %) for all the tested MRSA clinical isolates, with a dose-dependent activity resulting in the highest percentage of bacterial growth inhibition (89.39%) at 2MIC concentration. Conclusion: Overall, our data demonstrated the potential of some AMPs against MRSA isolates, such as Citropin 1.1 and CA(1-7)M(2-9)NH2, that represents a promising area of development for different clinical applications.

Differential effects of α-helical and β-hairpin antimicrobial peptides against Acanthamoeba castellanii

Parasitology ◽  
2009 ◽  
Vol 136 (8) ◽  
pp. 813-821 ◽  
Author(s):  
R. S. SACRAMENTO ◽  
R. M. MARTINS ◽  
A. MIRANDA ◽  
A. S. S. DOBROFF ◽  
S. DAFFRE ◽  
...  
Keyword(s):  
Antimicrobial Peptides ◽  
Growth Inhibition ◽  
High Performance ◽  
Acanthamoeba Castellanii ◽  
Mass Spectrometry Analysis ◽  
Triatoma Infestans ◽  
Spectrometry Analysis ◽  
Blood Sucking ◽  
Different Types ◽  
Culture Supernatants

SUMMARYIn this work we evaluated the ability of different types of antimicrobial peptides to promote permeabilization and growth inhibition of Acanthamoeba castellanii trophozoites, which cause eye keratitis. We used cationic α-helical peptides P5 and P6, corresponding to the N-terminus of the pore-forming protein from Triatoma infestans, a blood-sucking insect, and a β-hairpin amphipathic molecule (gomesin), of the spider Acanthoscurria gomesiana haemocytes. A. castellanii permeabilization was obtained after 1 h incubation with micromolar concentrations of both types of peptides. While permeabilization induced by gomesin increased with longer incubations, P5 permeabilization did not increase with time and occurred at doses that are more toxic for SIRC cells. P5, however, at doses below the critical dose used to kill rabbit corneal cells was quite effective in promoting growth inhibition. Similarly, P5 was more effective when serine protease inhibitor was added simultaneously to the permeabilization assay. High performance chromatography followed by mass spectrometry analysis confirmed that, in contrast to gomesin, P5 is hydrolysed by A. castellanii culture supernatants. We conclude that the use of antimicrobial peptides to treat A. castellanii infections requires the search of more specific peptides that are resistant to proteolysis.

Light-induced increase in the contents of ferulic and diferulic acids in cell walls of Avena coleoptiles: its relationship to growth inhibition by light

1994 ◽  
Vol 92 (2) ◽  
pp. 350-355 ◽  
Author(s):  
Kensuke Miyamoto ◽  
Junichi Ueda ◽  
Satomi Takeda ◽  
Kazuko Ida ◽  
Takayuki Hoson ◽  
...  
Keyword(s):  
Growth Inhibition ◽  
Cell Walls

Antimicrobial peptides in COPD

Pneumologie ◽  
2009 ◽  
Vol 63 (S 01) ◽  
Author(s):  
G Günther ◽  
E Andresen ◽  
J Bullwinkel ◽  
C Lange ◽  
H Heine
Keyword(s):  
Antimicrobial Peptides
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