Nitric oxide synthase activity in human squamous cell carcinoma of the head and neck.
Laryngoscope
; 109(1): 148-52, 1999 Jan.
Article
de En
| MEDLINE
| ID: mdl-9917057
ABSTRACT
OBJECTIVES:
To test whether nitric oxide synthase (NOS) is expressed in primary otolaryngologic tumors and whether this expression is associated with the degree of malignancy. STUDYDESIGN:
Twenty-six samples from the primary localization of human pharyngolaryngeal squamous cell carcinoma. MATERIALS ANDMETHODS:
the activity of calcium-dependent and calcium-independent NOS was analyzed by the conversion of L-[14C]-arginine into L-[14C]-citrulline.RESULTS:
NOS activity is below detectable levels in pharyngolaryngeal mucosa from noncancer patients. In the primary localization of the tumor, calcium-independent NOS activity is maximal at early stages of tumor growth, whereas calcium-dependent activity increases from early to advanced stages.CONCLUSIONS:
These data suggest that tumor growth and malignancy is associated with a change in the enzymatic source of NO from calcium-independent NOS to calcium-dependent NOS isoform in primary localization. These data suggest that the inhibition of calcium-independent NOS activity in early stages and/or inhibition of calcium-dependent NOS activity in later stages could delay growth of solid tumors.
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Collection:
01-internacional
Base de données:
MEDLINE
Sujet principal:
Carcinome épidermoïde
/
Tumeurs du pharynx
/
Tumeurs du larynx
/
Nitric oxide synthase
Limites:
Adult
/
Aged
/
Aged80
/
Humans
/
Middle aged
Langue:
En
Journal:
Laryngoscope
Sujet du journal:
OTORRINOLARINGOLOGIA
Année:
1999
Type de document:
Article
Pays d'affiliation:
Espagne