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Iron acquisition by Haemophilus influenzae.
K A Pidcock1, J A Wooten, B A Daley
1Department of Pediatrics, Medical College of Pennsylvania, Philadelphia 19129.
Infection and Immunity
|April 1, 1988
Summary
Haemophilus influenzae utilizes diverse iron sources, including heme and transferrin, for growth. Its iron acquisition mechanisms and role in pathogenesis require further investigation.
Area of Science:
- Microbiology
- Pathogenesis
- Bacterial Physiology
Background:
- The mechanisms by which Haemophilus influenzae acquires iron are not well understood.
- Iron is essential for bacterial growth and a key factor in pathogenesis.
Purpose of the Study:
- To investigate the various sources of iron utilized by Haemophilus influenzae (H. influenzae).
- To explore the role of iron acquisition in H. influenzae pathogenesis.
Main Methods:
- Assessed growth of H. influenzae strains with heme and nonheme iron sources in defined, iron-restricted medium.
- Analyzed outer membrane protein profiles under varying iron concentrations.
- Tested for catechol and hydroxamate production.
Main Results:
- All tested H. influenzae strains acquired iron from heme, hemoglobin, hemoglobin-haptoglobin, and heme-hemopexin.
- Growth was enhanced by partially saturated human transferrin but not lactoferrin or ferritin.
- Significant alterations in outer membrane proteins were observed with changes in iron levels; hydroxamate production was detected.
Conclusions:
- Haemophilus influenzae can utilize a diverse range of iron sources.
- The specific roles of hydroxamate production and iron-regulated outer membrane proteins in H. influenzae iron acquisition remain unclear.