The influence of hypercholesterolaemia on the adrenal uptake and metabolic handling of 131I-6 beta-iodomethyl-19-norcholesterol (NP-59).

Abstract:

:The biodistribution of 131I-6 beta-iodomethyl-19-norcholesterol (NP-59) was assessed in hypercholesterolaemic patients and in a rabbit model of HC to examine the alterations in the relative distribution of NP-59 and its metabolites and to explain the changes in the patterns of adrenal cortical imaging in patients with expanded cholesterol pools. Rabbits were rendered hypercholesterolaemic with a diet supplemented with 2% cholesterol for 2 weeks prior to the intravenous administration of 240 to 570 microCi of NP-59. Adrenal, bile and serum samples were obtained from four hypercholesterolaemic rabbits at 48 h following NP-59 administration, and the distribution of 131I radioactivity was compared to that of seven rabbits maintained on a standard laboratory diet. Serum cholesterol levels were 1940 +/- 248 mg dl-1 in the hypercholesterolaemic rabbits as compared to 268 +/- 62 mg dl-1 in the controls. Adrenal cortical uptake of NP-59 was decreased in HC rabbits but no significant differences were observed in the relative proportions of NP-59 or its metabolites in the bile and adrenal tissues of hypercholesterolaemic versus control animals. Hypercholesterolaemic animals did exhibit an increase in NP-59 esters in serum as compared to controls. In three of five patients with hypercholesterolaemia, adrenal uptake of NP-59 was enhanced after successful lowering of serum cholesterol levels, while the remaining two patients who responded inadequately to cholesterol-lowering therapy showed a slight drop in NP-59 uptake.

journal_name

Nucl Med Commun

authors

Lynn MD,Gross MD,Shapiro B,Bassett D

doi

10.1097/00006231-198608000-00010

subject

Has Abstract

pub_date

1986-08-01 00:00:00

pages

631-7

issue

8

eissn

0143-3636

issn

1473-5628

journal_volume

7

pub_type

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