scholarly journals Heme oxygenase (HO-1). Evidence for electrophilic oxygen addition to the porphyrin ring in the formation of alpha-meso-hydroxyheme.

1994 ◽  
Vol 269 (47) ◽  
pp. 29553-29556
Author(s):  
A Wilks ◽  
J Torpey ◽  
P R Ortiz de Montellano
Author(s):  
Catharina Taiko Migita ◽  
Hiroshi Fujii ◽  
Kathryn Mansfield Matera ◽  
Satoshi Takahashi ◽  
Hong Zhou ◽  
...  

PEDIATRICS ◽  
1988 ◽  
Vol 81 (6) ◽  
pp. 882-884
Author(s):  
M. JEFFREY MAISELS

One of the first steps in the formation of bilirubin from hemoglobin is an oxidative process in which the α-methene bridge of the heme porphyrin ring is opened and carbon monoxide and bilirubin are formed. This oxidation is catalyzed by the enzyme microsomal heme oxygenase. Following earlier observations from their laboratory, Drummond and Kappas1 demonstrated that tin protoporphyrin (Sn-protoporphyrin) was the most potent of several synthetic metalloporphyrins that competitively inhibited heme oxygenase. By competing with this enzyme, Sn-protoporphyrin inhibits the conversion of heme to bilirubin and is effective in preventing or ameliorating experimental and naturally occurring jaundice in the neonatal animal and adult human.


2011 ◽  
Vol 49 (01) ◽  
Author(s):  
R Barikbin ◽  
D Schwinge ◽  
C Schramm ◽  
G Tiegs ◽  
G Sass

Author(s):  
Krishna Reddy BV ◽  
Avinash Kumar Reddy G ◽  
Sujitha V ◽  
Manasa A

DM otherwise diabetes is now a days an epidemic with the percentage of patient population rising to almost 10% of the world population. Out of all the DM complications, cataract leads the way contributing to disabilities to about 60% of diabetic population. But the pathogenesis of DM cataract is still a half-understood area of medicine there by posing a problem in the therapy. The data that we have till now gives us enough evidence to advocate the oxidative stress has a major role for the pathogenesis of DM complications like DMnephropathy, DMneuropathy, and cardiac hypertrophy, which suggests the oxidative stress is a central feature of diabetes. In the current research, the pharmacological evaluation of Fisetin for its DM based anti-cataract property was performed. This research concentrates to estimate the possible involvement of Nrf-2 / heme oxygenase (HO)-pathway in the observed therapeutic effect, if any. The data obtained in this study also indicate that the observed beneficial effects mainly due to activation of Nrf2/HO-1 pathway. These effects probably result in increased tissue anti-oxidant status as well as decreased free radical production, which ultimately responsible for the observed beneficial effects of Fisetin against hyperglycemia-induced cataract.


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