Hopkins Marine Station Student Paper

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(full paper is archived in the Miller Library)

Title: Factors governing nematocyst discharge for cnidophage cells of the nudibranch Aolida papillosa
Student Author(s): Gallagher, Catherine L.
Pages: 23
Location: Final Papers Biology 175H
Date: June 1988
Keywords: biological studies on gastropods
Abstract: Nemacysts isolated from Aeolidea papillosa were subjected to different ionic media and their frequency of discharge assessed. Discharge of nematocysts isolated by homogenization could not be induced, suggesting that proper function of the cnidae is at least partially dependent on surrounding tissues. When nematocysts are extruded from intact cerata into ionic media, condtions that inhibit normal contraction of the cerata also reduce nematocyst discharge. Some aspect of passage through the cnidopore or contact with sea water could initiate an intracellular signal in the cnidophage that causes its nematocysts to discharge. A battery of second-messenger inducing systems including forskolin (stimulates adenylate cyclase), TPA (stimulates protein kinase C), calcium ionophore (causes release of intracellular Ca+2 stores), and pH affectors failed, however, to cause nematocyst discharge from isolated cnidophage.