scholarly journals Antioxidant Activity of New Aramide Nanoparticles Containing Redox-Active N-phthaloyl Valine Moieties in the Hepatic Cytochrome P450 System in Male Rats

Molecules ◽  
2012 ◽  
Vol 17 (7) ◽  
pp. 8255-8275 ◽  
Author(s):  
Hammed H. A. M. Hassan ◽  
Sabah G. El-Banna ◽  
Amel F. Elhusseiny ◽  
El-Sayed M. E. Mansour
Keyword(s):  
Antioxidant Activity ◽  
Cytochrome P450 ◽  
Male Rats ◽  
Cytochrome P450 System ◽  
Redox Active ◽  
Hepatic Cytochrome

scholarly journals Noncanonical suppression of GH-dependent isoforms of cytochrome P450 by the somatostatin analog octreotide

2012 ◽  
Vol 216 (1) ◽  
pp. 87-97 ◽  
Author(s):  
Rajat Kumar Das ◽  
Sarmistha Banerjee ◽  
Bernard H Shapiro
Keyword(s):  
Cytochrome P450 ◽  
Total Content ◽  
Somatostatin Analog ◽  
Male Rats ◽  
Response Factors ◽  
Gh Secretion ◽  
Socs Proteins ◽  
Therapeutic Doses ◽  
Hepatic Genes ◽  
Hepatic Cytochrome

Octreotide is a potent somatostatin analog therapeutically used to treat several conditions including hyper GH secretion in patients with acromegaly. We infused, over 30 s, octreotide into male rats every 12 h for 6 days at levels considerably greater than typical human therapeutic doses. Unexpectedly, resulting circulating GH profile was characterized by pulses of higher amplitudes, longer durations, and greater total content than normal, but still contained an otherwise male-like episodic secretory profiles. In apparent disaccord, the normally elevated masculine expression levels (protein and/or mRNA) of CYP2C11 (accounting for >50% of the total hepatic cytochrome P450 content), CYP3A2, CYP2C7, and IGF1, dependent on the episodic GH profile, were considerably downregulated. We explain this contradiction by proposing that the requisite minimal GH-devoid interpulse durations in the masculine profile that solely regulate expression of at least CYP2C11 and IGF1 may be sufficiently reduced to suppress transcription of the hepatic genes. Alternatively, we observed that octreotide infusion may have acted directly on the hepatocytes to induce expression of immune response factors postulated to suppress CYP transcription and/or upregulate expression of several negative regulators (e.g. phosphatases and SOCS proteins) of the JAK2/STAT5B signaling pathway that normally mediates the upregulation of CYP2C11 and IGF1 by the masculine episodic GH profile.

scholarly journals Inactivation of the Hepatic Cytochrome P450 System by Conditional Deletion of Hepatic Cytochrome P450 Reductase

2003 ◽  
Vol 278 (15) ◽  
pp. 13480-13486 ◽  
Author(s):  
Colin J. Henderson ◽  
Diana M. E. Otto ◽  
Dianne Carrie ◽  
Mark A. Magnuson ◽  
Aileen W. McLaren ◽  
...  
Keyword(s):  
Cytochrome P450 ◽  
Cytochrome P450 Reductase ◽  
Cytochrome P450 System ◽  
P450 Reductase ◽  
Conditional Deletion ◽  
Hepatic Cytochrome

Metabolic Induction of the Hepatic Cytochrome P450 System by Chlorfenvinphos in Rats

1991 ◽  
Vol 17 (2) ◽  
pp. 361-367
Author(s):  
TAKANORI IKEDA ◽  
SHUJI TSUDA ◽  
YASUHIKO SHIRASU
Keyword(s):  
Cytochrome P450 ◽  
Cytochrome P450 System ◽  
Metabolic Induction ◽  
Hepatic Cytochrome
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