Studies suggest that human cathelicidins (LL-37) and Leukotriene B4 may work in a positive feedback loop, meaning they may both stimulate each other for enhanced immunei response:
- Leukotriene B4 triggers release of the cathelicidin LL-37 from human neutrophils: novel lipid-peptide interactions in innate immune responses
- Leukotriene b4 triggers the in vitro and in vivo release of potent antimicrobial agents
- Leukotriene B4/antimicrobial peptide LL-37 proinflammatory circuits are mediated by BLT1 and FPR2/ALX and are counterregulated by lipoxin A4 and resolvin E1
And several studies suggest that Leukotriene B4, cathelicidins and defensins indeed play a very important role together in controlling infections:
- LTB4 increases nasal neutrophil activity and conditions neutrophils to exert antiviral effects
- Intrapulmonary administration of leukotriene B4 enhances pulmonary host defense against pneumococcal pneumonia
- Leukotriene B(4)-Mediated Release of Antimicrobial Peptides against Cytomegalovirus Is BLT1 Dependent
- Leukotrienes play a role in the control of parasite burden in murine strongyloidiasis.
- Inhibition of leukotriene biosynthesis abrogates the host control of Mycobacterium tuberculosis.
- Leukotriene B4 protects latently infected mice against murine cytomegalovirus reactivation following allogeneic transplantation.
- Leukotriene-deficient mice manifest enhanced lethality from Klebsiella pneumonia in association with decreased alveolar macrophage phagocytic and bactericidal activities
- Release of anti-HIV mediators after administration of leukotriene B4 to humans.
- Leukotriene B(4) induces nitric oxide synthesis in Trypanosoma cruzi-infected murine macrophages and mediates resistance to infection.
- Possible role of LTB4 in the antiviral activity of turbot (Scophthalmus maximus) leukocyte-derived supernatants against viral hemorrhagic septicemia virus (VHSV).
- Role of mast cell leukotrienes in neutrophil recruitment and bacterial clearance in infectious peritonitis.
- Leukotriene B4 Induces Release of Antimicrobial Peptides in Lungs of Virally Infected Mice
- Leukotriene B4-loaded microspheres as a new approach to enhance antimicrobial responses in Histoplasma capsulatum-infected mice
Many herbal supplements and prescription and non-prescription drugs are known to block production of Leukotriene B4 either by inhibiting all downstream leukotriene products of the 5-Lipoxygenase (5-LOX) pathway or by blocking Leukotriene B4 (LTB4) directly. Below is a list of several herbal supplement or prescription and non-prescription drugs that studies suggest may inhibit the 5-LOX pathway or block LTB4 directly:
Prescription and Non-Prescription Drugs:
- Itraconazole (LTB4)
- Montelukast (Singulair) - cys-LT / LTB4 antagonist
- Zileuton (Zyflow)
- Caffeic Acid (White grapes, white wine, olives, olive oil, spinach, cabbage, asparagus, and coffee)
- Curcumin / Turmeric
- Eugenol (Cloves)
- Hyperforin (St John's Wort)
- Milk Thistle / Silymarin / Silibinin
- Green Tea Catechin
- Arnica montana
- Hamamelis virginian
- Hypericum perforatum (St John's Wort)
- Echinacea angustifolia