Kinetic effect of human lactoferrin on the growth of escherichia coli 0111

Stuart, Jan; Norrell, Stephen A.; Harrington, John P.

doi:10.1016/0020-711x(84)90085-5

Cited by 46 publications

(26 citation statements)

References 16 publications

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“…It is thought that Lf is capable of protecting against infection through different mechanisms of action, by regulating the iron needed for bacterial proliferation, specifically through its strong iron-binding power (11,12). Lf is also capable of causing cell membrane destruction by binding bacterial cell membrane proteins (24,25).…”

Section: Discussionmentioning

confidence: 99%

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Influence of lactoferrin in preventing preterm delivery: A pilot study

Giunta¹,

Giuffrida²,

Mangano

et al. 2011

Mol Med Report

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Section: Discussionmentioning

confidence: 99%

“…It has been detected in secretary fluids, such as milk, tears, saliva, vaginal secretion, seminal fluid, and amniotic fluid. Therefore, it is considered an important component of host defense against microbial infection (10)(11)(12).…”

Section: Introductionmentioning

confidence: 99%

Influence of lactoferrin in preventing preterm delivery: A pilot study

Giunta¹,

Giuffrida²,

Mangano

et al. 2011

Mol Med Report

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“…It sequesters iron that is essential for bacterial growth (3). However, the antibacterial activity of lactoferrin is not due only to its iron-binding capacity (51,55). A pepsin-derived fragment of lactoferrin has ironindependent bactericidal activity that is associated with release of lipopolysaccharide (LPS) (59).…”

Section: Discussionmentioning

confidence: 99%

Lactoferrin Impairs Type III Secretory System Function in EnteropathogenicEscherichia coli

Ochoa

Noguera-Obenza

Ebel³

et al. 2003

Infect Immun

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Enteropathogenic Escherichia coli (EPEC) is an important cause of infant diarrhea in developing countries. EPEC uses a type III secretory system to deliver effector proteins into the host cell. These proteins cause the characteristic attaching and effacing lesion on enterocytes. Lactoferrin, a glycoprotein present in human milk, inhibits EPEC adherence to mammalian cells. To determine the effect of lactoferrin on the initial host cell attachment step that is mediated by the type III secretory system, we focused on EPEC-induced actin polymerization in HEp2 cells, on the hemolytic activity, and on measurement of E. coli secreted proteins A, B, and D (EspABD). Lactoferrin blocked EPEC-mediated actin polymerization in HEp2 cells and blocked EPEC-induced hemolysis. The mechanism of this inhibition was lactoferrin-mediated degradation of secreted proteins necessary for bacterial contact and pore formation, particularly EspB. The proteolytic effect of lactoferrin was prevented by serine protease inhibitors. This disruption of the type III secretory system implies that lactoferrin could provide broad cross protection against the enteropathogens that share this mechanism.Enteropathogenic Escherichia coli (EPEC) is one of the major causes of infant diarrhea in developing countries. EPEC usually produces an acute watery diarrhea, but it can produce chronic diarrhea and lead to malnutrition (39).EPEC induces a distinctive histopathology known as the attaching and effacing lesion, which is characterized by the intimate attachment of bacteria to the epithelial surface and the effacement of host cell microvilli. There are three stages in EPEC pathogenesis: (i) initial adherence to the host cell through the bundle-forming pilus, (ii) production and translocation of bacterial proteins through a needle complex via a type III secretory system, and (iii) actin polymerization-associated intimate attachment and pedestal formation (20,39,53).The type III secretory system is present in many pathogenic gram-negative bacteria (Salmonella, Shigella, and Yersinia spp., Shiga toxin-producing E. coli, and Pseudomonas spp.). Its function is to transport virulence proteins from the bacterial cytoplasm into the host cell plasma membrane and cytoplasm upon contact with target cells (14,20,24). In EPEC, the type III secretory system forms a needle complex made of E. coli secretion component F (EscF), which is anchored to the inner and outer membranes of the bacteria through an inner and outer ring. Multimers of E. coli secreted protein A (EspA) attach to the tip of the needle, forming a tube-like structure between the bacterium and the host cell. Bacterial proteins (EspB, EspD, translocated intimin receptor [Tir], and others) are introduced into the mammalian cell via this tube. EspB and EspD create pores in the eukaryotic cell membrane. Intimin, an outer membrane bacterial protein binds to its receptor Tir, following the translocation and surface expression of Tir on the host cell. Intimin-Tir binding triggers polymerization of actin and other c...

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“…However, it has also been demonstrated that the polypeptide itself has bacteriostatic activity (27). Recently, it has been shown that lactoferrin can also function as an antiinflammatory factor in that it regulates the production of inflammatory cytokines in a manner similar to those of other anti-inflammatory cytokines.…”

mentioning

confidence: 99%