Biomaterial Database

Effect of phototherapy on the urinary excretion of tryptophan metabolites in neonatal hyperbilirubinemia. 1975

A De Antoni, and F F Rubaltelli, and C Costa, and G Allegri

The 24 hours urinary excretion of tryptophan metabolites after an aminoacid loading (50 mg/Kg body-weight) was studied in a group of hyperbilirubinemic infants with or without light exposure treatment, in comparison to normal newborn babies. Kynurenine was the main metabolite in the urine of the control subjects. In the hyperbilirubinemic infants a high urinary excretion of kynurenine and 3-hydroxyanthranilic acid was observed. In the ones treated with phototherapy these two substances were markedly decreased. Besides 3-hydroxykynurenine was almost always absent. The effect of the light exposure was studied on kynurenine and 3-hydroxykynurenine "in vitro". Kynurenine did not present any photodecomposition. On the contrary, 3-hydroxykynurenine was easily decomposed. This fact can explain the decreased excretion of 3-hydroxykynurenine and 3-hydroxyanthranilic acid observed in urine of hyperbilirubinemic newborn infants treated with phototherapy. The decrease of kynurenine in these infants probably is a consequence of the photodecomposition of 3-hydroxykynurenine.

UI	MeSH Term	Description	Entries
D007231	Infant, Newborn	An infant during the first 28 days after birth.	Neonate,Newborns,Infants, Newborn,Neonates,Newborn,Newborn Infant,Newborn Infants
D007567	Jaundice, Neonatal	Yellow discoloration of the SKIN; MUCOUS MEMBRANE; and SCLERA in the NEWBORN. It is a sign of NEONATAL HYPERBILIRUBINEMIA. Most cases are transient self-limiting (PHYSIOLOGICAL NEONATAL JAUNDICE) occurring in the first week of life, but some can be a sign of pathological disorders, particularly LIVER DISEASES.	Icterus Gravis Neonatorum,Neonatal Jaundice,Physiological Neonatal Jaundice,Severe Jaundice in Neonate,Severe Jaundice in Newborn,Jaundice, Physiological Neonatal,Neonatal Jaundice, Physiological
D007737	Kynurenine	A metabolite of the essential amino acid tryptophan metabolized via the tryptophan-kynurenine pathway.
D008027	Light	That portion of the electromagnetic spectrum in the visible, ultraviolet, and infrared range.	Light, Visible,Photoradiation,Radiation, Visible,Visible Radiation,Photoradiations,Radiations, Visible,Visible Light,Visible Radiations
D010782	Photolysis	Chemical bond cleavage reactions resulting from absorption of radiant energy.	Photodegradation
D005453	Fluorescence	The property of emitting radiation while being irradiated. The radiation emitted is usually of longer wavelength than that incident or absorbed, e.g., a substance can be irradiated with invisible radiation and emit visible light. X-ray fluorescence is used in diagnosis.
D006801	Humans	Members of the species Homo sapiens.	Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D014364	Tryptophan	An essential amino acid that is necessary for normal growth in infants and for NITROGEN balance in adults. It is a precursor of INDOLE ALKALOIDS in plants. It is a precursor of SEROTONIN (hence its use as an antidepressant and sleep aid). It can be a precursor to NIACIN, albeit inefficiently, in mammals.	Ardeydorm,Ardeytropin,L-Tryptophan,L-Tryptophan-ratiopharm,Levotryptophan,Lyphan,Naturruhe,Optimax,PMS-Tryptophan,Trofan,Tryptacin,Tryptan,Tryptophan Metabolism Alterations,ratio-Tryptophan,L Tryptophan,L Tryptophan ratiopharm,PMS Tryptophan,ratio Tryptophan
D014466	Ultraviolet Rays	That portion of the electromagnetic spectrum immediately below the visible range and extending into the x-ray frequencies. The longer wavelengths (near-UV or biotic or vital rays) are necessary for the endogenous synthesis of vitamin D and are also called antirachitic rays; the shorter, ionizing wavelengths (far-UV or abiotic or extravital rays) are viricidal, bactericidal, mutagenic, and carcinogenic and are used as disinfectants.	Actinic Rays,Black Light, Ultraviolet,UV Light,UV Radiation,Ultra-Violet Rays,Ultraviolet Light,Ultraviolet Radiation,Actinic Ray,Light, UV,Light, Ultraviolet,Radiation, UV,Radiation, Ultraviolet,Ray, Actinic,Ray, Ultra-Violet,Ray, Ultraviolet,Ultra Violet Rays,Ultra-Violet Ray,Ultraviolet Black Light,Ultraviolet Black Lights,Ultraviolet Radiations,Ultraviolet Ray