Linked Life Data

8444514

Source:http://linkedlifedata.com/resource/pubmed/id/8444514

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
1
pubmed:dateCreated
1993-4-2
pubmed:abstractText
The effect of in vitro carbamylation of serum protein with potassium cyanate on protein binding of penbutolol, a basic agent exclusively bound to alpha 1 acid glycoprotein (AAG), was investigated. Carbamylation of serum resulted in a weak increase on free fraction of penbutolol (4.45 +/- 0.54% before carbamylation vs 5.66 +/- 0.40% after; p < 0.025). Parallelly, potassium cyanate added to pure AAG and incubated for 90 min induced carbamylation of this protein (38 mumoles of 14C cyanate incorporated per gram of protein). A study in serum from patients with chronic renal disease (pre and postdialysis) showed no changes in protein binding of penbutolol, although AAG levels were significantly higher. However, Scatchard [1949] plot for penbutolol binding to serum from renal patients (both pre and postdialysis) showed a decrease in affinity constant (nKa = 11.13 x 10(5) M-1 in healthy volunteers, vs 5.56 x 10(5) M-1 in patients before dialysis and 4.57 x 10(5) M-1 after dialysis). We concluded that carbamylation of serum AAG in uremic patients could explain, in part, the absence of changes in protein binding of any basic drugs in this pathological condition. It appears that a decreased affinity constant could balance the effect of increased AAG levels.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Jan
pubmed:issn
0174-4879
pubmed:author
pubmed:issnType
Print
pubmed:volume
31
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
31-4
pubmed:dateRevised
2004-11-17
pubmed:meshHeading
pubmed:year
1993
pubmed:articleTitle
Unchanged protein binding of penbutolol in renal insufficiency: a possible role of carbamylation.
pubmed:affiliation
Pharmacology Department, Basque Country School of Medicine, Leioa, Spain.
pubmed:publicationType
Journal Article