Linked Life Data

15062894

Source:http://linkedlifedata.com/resource/pubmed/id/15062894

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PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
4
pubmed:dateCreated
2004-4-5
pubmed:abstractText
There has been an indication that leptin, the product of the human obesity gene, actively participates not only in metabolic regulation but also in the control of blood pressure. Recently, it has been proposed that abnormalities in the physical property of cell membranes may underlie the defects that are strongly linked to hypertension, stroke, and other cardiovascular diseases. We have shown previously that leptin significantly increased the membrane fluidity and improved the microviscosity of erythrocytes in humans through the nitric oxide-dependent mechanism. In the present study, we examined the effects of leptin on membrane fluidity of erythrocytes in subjects with essential hypertension by means of an electron paramagnetic resonance (EPR) and spin-labeling method. The values of the order parameter (S) and the peak height ratio (ho/h-1) obtained from the EPR spectra of erythrocytes were significantly greater in patients with essential hypertension (HT) than in age-matched normotensive subjects (NT) (S: HT 0.719 +/- 0.002, n = 16, NT 0.713 +/- 0.001, n = 29, P < .05; ho/h-1: HT 5.17 +/- 0.02, n = 16, NT 5.05 +/- 0.02, n = 29, P < .05). The finding indicated that the erythrocyte membrane fluidity was lower in patients with HT than in NT. Leptin decreased S and ho/h-1 in a dose-dependent manner in both NTs and HTs. The effect of leptin on the membrane fluidity was significantly more pronounced in HTs than in NTs (percent change in S: leptin 10(-8) g/mL, HT -3.4% +/- 0.2%, n = 16, NT -2.3% +/- 0.1%, n = 29, P < .05; leptin 10(-7) g/mL, HT -4.3% +/- 0.3%, n = 16, NT -3.3% +/- 0.1%, n = 29, P < .05). The results of the present study showed that leptin might have a crucial role in the regulation of the rheologic behavior of erythrocytes and the microcirculation in hypertension.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Apr
pubmed:issn
0895-7061
pubmed:author
pubmed:issnType
Print
pubmed:volume
17
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
375-9
pubmed:dateRevised
2009-2-24
pubmed:meshHeading
pubmed:year
2004
pubmed:articleTitle
Leptin and membrane fluidity of erythrocytes in essential hypertension. An electron paramagnetic resonance investigation.
pubmed:affiliation
Division of Cardiology, Department of Medicine, Wakayama Medical University, Wakayama, Japan. tsudak@mail.wakayama-med.ac.jp
pubmed:publicationType
Journal Article, Comparative Study, Research Support, Non-U.S. Gov't