VOPROSY MEDITSINSKOI KHIMII (ISSN 0042-8809)

Inhibitors of monoamine oxidase and the pressor response to dietary amines

   
Tipton K.F.
PubMed Id: 9503566
Year: 1997  Volume: 43  Issue: 6  Pages: 494-503
Because gastro-intestinal monoamine oxidase (MAO) effectively prevents dietary pressor amines, typically tyramine, from entering the tissues, a marked hypertensive response (the 'cheese reaction') can occur when subjects treated with antidepressant MAO inhibitors ingest foods or beverages rich in such amines. Although tyramine is a substrate for both MAO-A and -B, it is only inhibitors of the former enzyme, which are also the effective antidepressants, that give rise to the cheese reaction. This has be shown to be owing to MAO-A being the major form of MAO in intestine and stomach. Selective inhibition of that form of the enzyme results in substantial amounts of unchanged tyramine passing through the intestine. The development of reversible inhibitors of monoamine oxidase-A (RIMAs) has reduced this hypertensive response since rising tyramine concentrations can displace the inhibitor from the enzyme and thus allow some metabolism to occur. This has led to the development of MAO-inhibitory antidepressants that may, apparently, be used without dietary restriction. However, reversibility of the inhibitory process is not sufficient and the analysis of inhibitory behaviour presented here indicates that such safety will only be obtained with inhibitors that are competitive with respect to the amine substrates. Noncompetitive inhibitors might be expected to offer no safety advantage in this respect, whereas uncompetitive could actually exacerbate the pressor response.
Download PDF:
Reference:

Tipton K.F. (1997) Voprosy meditsinskoi khimii, 43(6), 494-503.
References  
 2002 (vol 48)
 2001 (vol 47)
 2000 (vol 46)
 1999 (vol 45)
 1998 (vol 44)
 1997 (vol 43)
 1996 (vol 42)
 1995 (vol 41)
 1994 (vol 40)
 1993 (vol 39)
 1992 (vol 38)
 1991 (vol 37)
 1990 (vol 36)
 1989 (vol 35)
 1988 (vol 34)
 1987 (vol 33)
 1986 (vol 32)
 1985 (vol 31)
        

© Institute of Biomedical Chemistry, Moscow, Russia