All participants had insufficient serum levels of vitamin D and among
them, 82.3% had vitamin D deficiency [8]. Despite that, in all serum
PTH levels were within the normal range, with wide ranging from
10.2 to 61.5 pg/mL for 25OHD levels lower than 20 ng/mL.
The mean serum 25OHD levels increase, observed 14 days after a
single oral dose of cholecalciferol taken with a 15 g fat meal, is consis-
tent with other studies of our group [14,18]. Although serum 25OHD
measurements could be less sensitive to estimate variations on vitamin
D absorption than serum cholecalciferol measurements [21], this me-
tabolite of vitamin D has been shown to increase rapidly after vitamin
D supplementation, and it has been used to evaluate vitamin D status
as well as the effect of vitamin D supplementation [22–24].
Membranetransporterscouldbeinvolvedinfat-solublevitaminsin-
testinal absorption since cholesterol and other fat-soluble molecules
share a number of transport mechanisms [25]. Ezetimibe is a potent
and selective inhibitor of NPC1L1, the main intestinal cholesterol trans-
porter[16].Followingoraladministration,ezetimibeisrapidlyabsorbed
and extensively metabolized (N80%) to the pharmacologically active
ezetimibe-glucuronide, total concentrations reach a maximum 1–2 h
post-administration, followed by enterohepatic recycling and slow
elimination
All participants had insufficient serum levels of vitamin D and amongthem, 82.3% had vitamin D deficiency [8]. Despite that, in all serumPTH levels were within the normal range, with wide ranging from10.2 to 61.5 pg/mL for 25OHD levels lower than 20 ng/mL.The mean serum 25OHD levels increase, observed 14 days after asingle oral dose of cholecalciferol taken with a 15 g fat meal, is consis-tent with other studies of our group [14,18]. Although serum 25OHDmeasurements could be less sensitive to estimate variations on vitaminD absorption than serum cholecalciferol measurements [21], this me-tabolite of vitamin D has been shown to increase rapidly after vitaminD supplementation, and it has been used to evaluate vitamin D statusas well as the effect of vitamin D supplementation [22–24].Membranetransporterscouldbeinvolvedinfat-solublevitaminsin-testinal absorption since cholesterol and other fat-soluble moleculesshare a number of transport mechanisms [25]. Ezetimibe is a potentand selective inhibitor of NPC1L1, the main intestinal cholesterol trans-porter[16].Followingoraladministration,ezetimibeisrapidlyabsorbedand extensively metabolized (N80%) to the pharmacologically activeezetimibe-glucuronide, total concentrations reach a maximum 1–2 hpost-administration, followed by enterohepatic recycling and slowelimination
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