title: Increased nitric oxide release by neutrophils of a patient with tyrosinemia type III.
abstract: Tyrosinemia type III (OMIM 276710) is an autosomal recessive disorder caused by the deficiency of 4-hydroxyphenylpyruvate dioxygenase (4-HPD). Few cases have been described with mental retardation or neurological symptoms. Recently it has been demonstrated that 4-HPD participates to nitric oxide (NO) intracellular sequestration in Pseudomonas aeruginosa. 4-HPD is an ubiquitous enzyme with a prominent expression in neutrophils and neurons. In the nervous system NO has been perceived to be a potential neuromodulator although prolonged excessive generation is detrimental. We analyzed NO release by neutrophils of a patient with tyrosinemia type III in order to evaluate a possible influence of 4-HPD deficiency on this process. Our patient, previously described, is a 30-year-old women with persistent tyrosinemia (450-680 micromol/l) and deficient activity of 4-HPD. At 17 months of age she experienced an acute ataxia and drowsiness lasting for 10 days, but further clinical course showed persistent tyrosinemia with normal growth and psychomotor development. Neutrophils isolated from our patient exhibited a NO release greatly higher in respect to the controls (mean+/-SEM 23.2+/-1.8 micromol/10(6) cells vs 3.5+/-0.5 micromol/10(6) cells). Clinical findings of tyrosinemia type III include neurological symptoms and mental retardation but no consistent phenotype has emerged. Therefore the pathogenesis of neurological involvement is yet not well understood. Our results suggest that an excessive neutrophils of NO release could reflect the lack of scavenging action of 4-HPD. Considering the prominent expression of this enzyme in neurons, we hypothesize that excessive NO release could participate in neuronal damage explaining the neurological involvement described in patients with tyrosinemia type III.
authors.affiliation: Department of Pediatrics, University of Roma "La Sapienza", Viale Regina Elena 324, 00161 Roma, Italy. patdeufemia@inwind.it
authors.forename: Patrizia
authors.initials: P
authors.lastname: D'Eufemia
authors.forename: Roberto
authors.initials: R
authors.lastname: Finocchiaro
authors.forename: Mauro
authors.initials: M
authors.lastname: Celli
authors.forename: Ivana
authors.initials: I
authors.lastname: Raccio
authors.forename: Enrico
authors.initials: E
authors.lastname: Properzi
authors.forename: Alessandra
authors.initials: A
authors.lastname: Zicari
mesh_terms: D015111:4-Hydroxyphenylpyruvate Dioxygenase / Q000172:deficiency; D000328:Adult; D005260:Female; D006801:Humans; D009504:Neutrophils / Q000378:metabolism*; D009569:Nitric Oxide / Q000096:biosynthesis*; D009573:Nitrites / Q000032:analysis; D020176:Tyrosinemias / Q000097:blood / Q000378:metabolism* / Q000503:physiopathology
chemical_list: D009573:Nitrites; D009569:Nitric Oxide; D015111:4-Hydroxyphenylpyruvate Dioxygenase