The present study demonstrates that a NADPH/Ca2+-dependent nitric oxide synthase (NOS) activity is present in the soluble and in the particulate fractions of fish caudal spinal cord homogenates, both activities being inhibited by calmodulin inhibitors (W7 and/or TFP) and by the NOS inhibitor L-NAME. Moreover, Western blot analysis using either anti-NOS I or anti-NOS III antibodies shows that the soluble enzyme corresponds to the brain NOS (NOS-I) of mammals, whereas the particulate one is likely attributable to NOS I and/or NOS III (ecNOS) enzymes. To confirm the nitric oxide (NO) production by the caudal spinal cord homogenates, the NO-mediated conversion of oxyhemoglobin to methemoglobin was monitored spectroscopically. The present results are consistent with a constitutive, Ca2+-calmodulin- dependent, NO production by the caudal neurosecretory system.

Partial biochemical characterization of nitric oxide synthase in the caudal spinal cord of the teleost Oreochromis niloticus / Cioni, Carla; Nadia, Francia; Fabrizi, Cinzia; Marco, Colasanti; Giorgio, Venturini. - In: NEUROSCIENCE LETTERS. - ISSN 0304-3940. - STAMPA. - 253:1(1998), pp. 68-70. [10.1016/s0304-3940(98)00592-8]

Partial biochemical characterization of nitric oxide synthase in the caudal spinal cord of the teleost Oreochromis niloticus

CIONI, Carla;FABRIZI, CINZIA;
1998

Abstract

The present study demonstrates that a NADPH/Ca2+-dependent nitric oxide synthase (NOS) activity is present in the soluble and in the particulate fractions of fish caudal spinal cord homogenates, both activities being inhibited by calmodulin inhibitors (W7 and/or TFP) and by the NOS inhibitor L-NAME. Moreover, Western blot analysis using either anti-NOS I or anti-NOS III antibodies shows that the soluble enzyme corresponds to the brain NOS (NOS-I) of mammals, whereas the particulate one is likely attributable to NOS I and/or NOS III (ecNOS) enzymes. To confirm the nitric oxide (NO) production by the caudal spinal cord homogenates, the NO-mediated conversion of oxyhemoglobin to methemoglobin was monitored spectroscopically. The present results are consistent with a constitutive, Ca2+-calmodulin- dependent, NO production by the caudal neurosecretory system.
1998
caudal neurosecretory system; oreochromis niloticus; biochemical characterization; teleost; caudal spinal cord; nos i; nitric oxide synthase; nos iii
01 Pubblicazione su rivista::01a Articolo in rivista
Partial biochemical characterization of nitric oxide synthase in the caudal spinal cord of the teleost Oreochromis niloticus / Cioni, Carla; Nadia, Francia; Fabrizi, Cinzia; Marco, Colasanti; Giorgio, Venturini. - In: NEUROSCIENCE LETTERS. - ISSN 0304-3940. - STAMPA. - 253:1(1998), pp. 68-70. [10.1016/s0304-3940(98)00592-8]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/247258
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