Nematocyst

Nematocysts are specialized, highly complex secretory organelles found within cnidocytes (stinging cells) of jellyfish and other cnidarians (Wikipedia, 2024). They function as a microscopic poison harpoon used for prey capture and defense, capable of delivering potent toxins through a rapid, pressure-driven discharge mechanism triggered by chemical or mechanical stimuli (StatPearls, 2023). While not a traditional molecular drug target, nematocysts are the primary vectors for jellyfish envenomation, which can lead to severe pain, skin necrosis, and in some cases, systemic cardiovascular or respiratory failure (PubMed, PMID: 28675110). Therapeutic interventions typically focus on inhibiting the discharge of undischarged nematocysts remaining on the skin—using substances like acetic acid for certain species—or treating the physiological effects of the injected venom (NIH, 2022). Research into nematocyst inhibitors aims to develop topical preventatives for swimmers and divers to prevent the initial injection of toxins (Toxicon, 2019).

Other names

CnidocystCnidaStinging organelleJellyfish stinging cell organelle

Inhibition of nematocyst discharge through chemical stabilization or osmotic interference, and symptomatic treatment of injected toxins.