Changes in Host Resistance Caused by Nocardia brasiliensis in Mice: Cross-Protection against Listeria monocytogenes

1978 ◽  
Vol 57 (1) ◽  
pp. 74-81 ◽  
Author(s):  
Emma I. Melendro ◽  
Magdalena F. Contreras ◽  
Cecilia Ximénez ◽  
Ana Ma. García-Maynez ◽  
Librado Ortiz-Ortiz
Keyword(s):  
Listeria Monocytogenes ◽  
Host Resistance ◽  
Cross Protection ◽  
Nocardia Brasiliensis

scholarly journals Dietary Fish Oil Impairs Primary Host Resistance Against Listeria monocytogenes More than the Immunological Memory Response

2003 ◽  
Vol 133 (4) ◽  
pp. 1163-1169 ◽  
Author(s):  
Robert Irons ◽  
Michele J. Anderson ◽  
Meijuan Zhang ◽  
Kevin L. Fritsche
Keyword(s):  
Listeria Monocytogenes ◽  
Fish Oil ◽  
Host Resistance ◽  
Immunological Memory ◽  
Primary Host ◽  
Memory Response ◽  
Dietary Fish

Role of Sigma B Factor in the Alkaline Tolerance Response of Listeria monocytogenes 10403S and Cross-Protection against Subsequent Ethanol and Osmotic Stress

2008 ◽  
Vol 71 (7) ◽  
pp. 1481-1485 ◽  
Author(s):  
EFSTATHIOS S. GIOTIS ◽  
MUDCHAREE JULOTOK ◽  
BRIAN J. WILKINSON ◽  
IAN S. BLAIR ◽  
DAVID A. MCDOWELL
Keyword(s):  
Listeria Monocytogenes ◽  
Osmotic Stress ◽  
Surface Cleaning ◽  
Cross Protection ◽  
Ethanol Stress ◽  
Alkaline Ph ◽  
Alkaline Tolerance ◽  
Wide Range ◽  
Type Strains

Many of the considerable abilities of Listeria monocytogenes to persist and grow in a wide range of adverse environmental conditions are thought to be at least partly under the control of the alternative sigma factor (σB), encoded by the sigB gene. However, little is known about the role of this master regulon in the impressive ability of Listeria to persist and grow under conditions of alkaline pH. In this study, Northern blot analysis of parent Listeria mRNA revealed that alkali adaptation (pH 9.5 for 1 h) significantly increased the expression of sigB-derived mRNA. The study included a comparison of the relative survival of mid-exponential populations of adapted and nonadapted parent type (σB expressing) and mutant (not σB expressing, ΔsigB) Listeria strains during subsequent alkaline (pH 12.0), osmotic (25% NaCl, wt/vol), or ethanol (16.5%) stress. Alkali-adapted parent strains were more resistant to pH 12.0 than were adapted ΔsigB type strains, but both alkali-adapted parent and ΔsigB strains were more resistant to pH 12.0 than were nonadapted strains. Alkali-adapted parent strains were more resistant to osmotic stress than were adapted ΔsigB type strains. No significant differences in viability were observed between alkali-adapted parent and ΔsigB strains after ethanol stress, suggesting that cross-protection against osmotic stress is mediated by σB whereas cross-protection against ethanol is σB independent. Overall, alkali-induced cross-protection against osmotic and ethanol challenges may have serious implications for food safety and human health because such stress conditions are routinely used as part of food preservation and surface cleaning processes.

Prophylactic administration of Withania somnifera extract increases host resistance in Listeria monocytogenes infected mice

2006 ◽  
Vol 6 (10) ◽  
pp. 1535-1542 ◽  
Author(s):  
Silvia T. Teixeira ◽  
Marize C. Valadares ◽  
Shirley A. Gonçalves ◽  
Adriana de Melo ◽  
Mary L.S. Queiroz
Keyword(s):  
Listeria Monocytogenes ◽  
Host Resistance ◽  
Withania Somnifera ◽  
Prophylactic Administration
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