| Project/Area Number |
13672264
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Physical pharmacy
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| Research Institution | Nigata University of Phermacy and Applied Life Sciences |
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Principal Investigator |
KITAGAWA Shuji Niigata University of Pharmacy and Applied Life Sciences, Faculty of Pharmaceutical Sciences, Professor, 薬学部, 教授 (00108911)
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| Project Period (FY) |
2001 – 2003
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| Project Status |
Completed (Fiscal Year 2003)
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| Budget Amount *help |
¥3,600,000 (Direct Cost: ¥3,600,000)
Fiscal Year 2003: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 2002: ¥1,100,000 (Direct Cost: ¥1,100,000)
Fiscal Year 2001: ¥1,800,000 (Direct Cost: ¥1,800,000)
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| Keywords | skin / stratum corneum lipids / cationic liposomes / ceramide / cationic surfactant / retinoic acid / transdermal permeation / erythrocyte membrane / 二本鎖カチオン性界面活性剤 / ESR / 吸収促進剤 / 界面活性剤 / スピンラベル |
|---|
| Research Abstract |
With the aim of efficient delivery of lipids and lipid analogs to skin, we studied the stability of cationic liposomes containing double-chained cationic surfactants, the interaction of the liposomes with erythrocyte membrane as well as that with skin. Dimethyldipalmitylammonium formed stable liposomes in the presence of phosphatidylcholines with unsaturated acy1 chains, whereas 1,2-dioleoyl-3-trimethylammonium propane formed the stable liposomes even in the presence of phosphatidylcholines with saturated acy1 chains. These cationic liposomes induced aggregation and fusion of the erythrocytes. By using such interaction of the liposomes with biological membranes we tried to deliver ceramide to lipid deficient skin. We confirmed that ceramide and dimethyl-dipalmitylammonium formed stable bilayer vesicles in the presence of cholesterol at a molar ratio of 1:1:1. The addition of the cationic liposomes to 80% ethanol-treated delipidized guinea pig dorsal skin slightly recovered the rigidity of the stratum corneum lipid lamella and had a tendency to recover its barrier function. We furthermore found the enhanced incorporation of retinoic acid using cationic liposomes. Through these findings we clarified the usefulness of the cationic liposomes to efficient delivery of lipids and lipid analogs to skin.
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