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Measuring Bacterial Load and Immune Responses in Mice Infected with Listeria monocytogenes
Published on: August 9, 2011
Growth of Listeria monocytogenes in defined media
Abstract:
Friedman, Mischa E. (U. S. Army Chemical Corps, Fort Detrick, Frederick, Md.), and William G. Roessler. Growth of Listeria monocytogenes in defined media. J. Bacteriol. 82:528-533. 1961-Listeria monocytogenes, strains A4413, JHH, and 9037-7, require organic sulfur, valine, and isoleucine for growth. In addition, A4413 requires leucine, whereas 9037-7 requires leucine, histidine, and arginine. Glutamine is stimulatory for all three strains. Further, A4413 is stimulated also by histidine, arginine, and methionine, and JHH by histidine, arginine, and leucine. With A4413, glutamine can be replaced by inorganic ammonium salts, urea, or asparagine but not by glutamic acid. Growth inhibition by d-serine is reversed by glycine or alanine. Growth with agitation in defined media is very poor and subculture is not possible unless unidentified products of enzymatic hydrolysis of proteins are present.A requirement for lipoic acid was not observed with five strains of L. monocytogenes.
Insights
This study details the specific nutrient requirements for Listeria monocytogenes growth in defined media. Key findings reveal essential amino acids and organic sulfur are crucial for bacterial proliferation.
Area of Science:
- Microbiology
- Bacteriology
- Nutritional Biochemistry
Background:
- Listeria monocytogenes is a significant bacterial pathogen.
- Understanding its nutritional requirements is vital for controlling its growth and preventing infections.
- Previous research has not fully elucidated the specific growth factors for all L. monocytogenes strains in defined media.
Purpose of the Study:
- To determine the precise nutritional requirements for the growth of three specific strains of Listeria monocytogenes (A4413, JHH, and 9037-7) in defined media.
- To investigate the effects of various supplements on bacterial growth and identify potential growth inhibitors and their reversal agents.
Main Methods:
- Culturing of Listeria monocytogenes strains (A4413, JHH, 9037-7) in chemically defined media.
- Systematic omission and addition of specific nutrients (amino acids, organic sulfur, vitamins, etc.) to assess growth responses.
- Testing of potential growth stimulants, inhibitors, and reversal agents.
Main Results:
- All tested strains require organic sulfur, valine, and isoleucine for growth.
- Strain A4413 additionally needs leucine, while strain 9037-7 requires leucine, histidine, and arginine.
- Glutamine stimulates growth in all strains; its role can be replaced by other nitrogen sources in strain A4413.
- D-serine inhibits growth, but this inhibition is reversed by glycine or alanine.
- Growth with agitation in defined media is poor without unidentified protein hydrolysate products.
- No lipoic acid requirement was observed in five tested strains.
Conclusions:
- Listeria monocytogenes exhibits strain-specific nutritional requirements beyond basic needs like organic sulfur, valine, and isoleucine.
- Specific amino acids and nitrogen sources play critical roles in supporting L. monocytogenes proliferation.
- The findings highlight the complexity of L. monocytogenes' nutritional needs and the potential for targeted nutritional strategies in controlling its growth.
