Stress prolongs the inflammatory response compromising the dermal reconstruction and wound closure. Acute stress-induced inflammation increases indoleamine 2, 3-dioxygenase-stimulated tryptophan catabolism. To investigate the role of indoleamine 2, 3-dioxygenase expression and tryptophan administration in adverse effects of stress on cutaneous wound healing, mice were submitted to chronic restr...

Expression of genes involved in tryptophan metabolism in Bacillus subtilis is regulated by the TRAP protein in response to changes in l-tryptophan levels. TRAP binding to several RNA targets that contain between 9 and 11 (G/U)AG repeats regulates transcription and/or translation of these genes. TRAP consists of 11 identical subunits and is activated to bind RNA by binding up to 11 molecules of ...

In Neurospora crassa, the starvation of tryptophan mutants for tryptophan resulted in the derepression of tryptophan, histidine, and arginine biosynthetic enzymes. This tryptophan-mediated derepression of histidine and arginine biosynthetic enzymes occurred despite the fact that the tryptophan-starved cells had a higher intracellular concentration of histidine and arginine than did nonstarved c...

OBJECTIVE To determine the effects of Medroxyprogesterone (hormonal contraceptive) in restraint stressed female rats in relation to tryptophan metabolism. DESIGN Pre-clinical study. PLACE AND DURATION OF STUDY Department of Biochemistry, University of Karachi. The investigation was carried out in the year 2003. MATERIALS AND METHODS Female Albino Wistar rats (150-200 gm body wt) were sele...

According to global statistics, over 80,000 deaths occur by suicide annually. Up to 90% of complete suicides are based on psychiatric disorders specifically major depressive disorder (MDD) and bipolar disorder. Furthermore high levels of inflammation have been indicated in suicidal patients in both central nervous system and the peripheral blood. Two biological mechanisms that play a key role i...

1. The effects of the administration of oestradiol and vitamin B, on tryptophan metabolism in the rat have been assessed by measurement of the release of 14C0, from [14C]tryptophan, in vivo, in order to determine whether, and to what extent, the abnormalities of tryptophan metabolism that are associated with oestrogen administration can be attributed to drug-induced vitamin B, deficiency or dep...

Tryptophan contents of liver, serum and kidney were determined in normal and vitamin-B-6-deficient rats after tryptophan injection. Tryptophan contents of normal and B-6-deficient liver were different, but not those in serum and kidney. Both kynurenine and 3-hydroxykynurenine accumulated in B-6-deficient liver more than in the normal. The 3-hydroxykynurenine contents after tryptophan injection ...

Hoch, J. A. (University of Illinois, Urbana), and R. D. DeMoss. Physiological role of tryptophanase in control of tryptophan biosynthesis in Bacillus alvei. J. Bacteriol. 91:667-672. 1966.-Indole excretion occurred early in the exponential growth phase, and derived mainly from biosynthetic intermediates of tryptophan. Tryptophan cleavage by tryptophanase contributed about 1.5% of the indole exc...

indolemine 2, 3-dioxygenase (ido) is a cytosolic monomeric hemoprotein enzyme that catalyses tryptophan, the least available essential amino acid in the human body, to n-formylkynurenine, which in turn rapidly degrades to give kynurenine. ido is expressed in different tissues, especially and prominently in some subsets of antigen presenting cells (apcs) of lymphoid organs and also in the placen...

There are indications that serotonergic neurotransmission is disturbed in several psychiatric disorders. One explanation may be disturbed transport of tryptophan (precursor for serotonin synthesis) across cell membranes. Human fibroblast cells offer an advantageous model to study the transport of amino acids across cell membranes, since they are easy to propagate and the environmental factors c...