Leukotriene

Context

Leukotrienes were named because they were first isolated from leukocytes (white blood cells) and contain a conjugated triene (three double bonds). They are produced through the 5-LOX branch of the arachidonic acid pathway, parallel to but distinct from the cyclooxygenase (COX) branch that produces prostaglandins.

The leukotriene family includes LTA4, LTB4, and the cysteinyl leukotrienes (LTC4, LTD4, LTE4). LTB4 is the principal joint-relevant leukotriene; the cysteinyl leukotrienes are most associated with asthma and allergic reactions.

Why it matters for joint health

LTB4 sustains chronic inflammation in joint tissue by recruiting neutrophils to the site, amplifying the local inflammatory response over time. This is the slow-burning arm of the inflammatory cascade, distinct from the fast-acting prostaglandin signal blocked by NSAIDs. Modulators of 5-LOX (such as AKBA-standardized boswellia) reduce leukotriene synthesis at the upstream enzyme, attenuating this amplification without compromising the prostaglandin arm or the gastric mucosa.