The stimulation of isolated photophores (ARGYROPELECUS) by epinephrine and norepinephrine
(1978) Comparative Biochemistry and Physiology. Part C: Toxicology & Pharmacology — Vol. 60C, n° 2, p. 137-143 (1978)
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- Authors
Maréchal, Georges 
- Abstract
- l. Photophores isolated from the ventral region of the bathypelagic fish Argyropelecus hemigymnus respond to epinephrine and norepinephrine by a long-lasting luminescence: the maximal light emission occurring at 10-6 M for epinephrine and 10-5 M for norepinephrine. is estimated at 8 x 106 quanta/sec per photophore. 2. The LD50 value of the light response calculated from the dose-response curves to both neuromediators, is 2 x 10-7 M epinephrine and 2 x 10-6 M for norepinephrine. 3. The light response to epinephrine is depressed by propranol and phentolamine 10-5 M and the maximum is shifted to concentration higher than 10-6 M. Phentolamine completely blocks the light evoked by norepinephrine at a concentration lower than 10-5 M and shifts the light maximum to 10-3 M. 4. Photophores show a greenish fluorescence when excited with 365nm u.v. light; the fluorescence intensity, is largely decreased after the light emission.
Citations
Baguet, F., & Maréchal, G. (1978). The stimulation of isolated photophores (ARGYROPELECUS) by epinephrine and norepinephrine. Comparative Biochemistry and Physiology. Part C: Toxicology & Pharmacology, 60C(2), 137-143. https://hdl.handle.net/2078.5/214310 (Original work published 1978)