Influence of lecithin acyl chain composition on the kinetics of exchange between chylomicrons and high density lipoproteins
The kinetics of lecithin exchange between native lipoproteins was characterized for individual molecular species of lecithins of rat mesenteric lymph chylomicrons and rat plasma HDL. Studies were performed in the absence of lipid transfer proteins. Donor (chylomicrons) and acceptor (HDL) particles w...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
1985-11-01
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| Series: | Journal of Lipid Research |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S0022227520342541 |
| _version_ | 1818741397889482752 |
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| author | G M Patton S J Robins J M Fasulo S B Clark |
| author_facet | G M Patton S J Robins J M Fasulo S B Clark |
| author_sort | G M Patton |
| collection | DOAJ |
| description | The kinetics of lecithin exchange between native lipoproteins was characterized for individual molecular species of lecithins of rat mesenteric lymph chylomicrons and rat plasma HDL. Studies were performed in the absence of lipid transfer proteins. Donor (chylomicrons) and acceptor (HDL) particles were present in ratios of 1:1 and 1:10 with respect to total phospholipid. Biphasic exchange kinetics were observed for all major lecithins common to chylomicrons and HDL at both proportions of donor to acceptor particles. During the early rapid phase of exchange, complete in about 30 min, 40-60% of the total lecithin pool was exchanged. Initial exchange rates were most rapid for the more hydrophilic species of the major lecithins normally present in both lipoproteins. Calculated activation energies correspondingly were least for a diunsaturated lecithin (18:1-20:4), intermediate for lecithins were 16:0 in position-1 (16:0-18:2 and 16:0-20:4), and highest for analogous lecithins with 18:0 in position-1. A 10-fold increase in the ratio of acceptor to donor particles affected neither the biphasic nature of the exchange nor the rates of exchange of individual molecular species (consistent with exchange by diffusion rather than by particle collisions). Total equilibration of individual molecular lecithin species was achieved by 24 hr (37 degrees C, donor to acceptor ratio of 1:1) with only a small change in the relative mass of lecithins in chylomicrons and HDL. Novel lecithins containing 18:3, incorporated into chylomicrons, were found to exchange exceedingly rapidly.(ABSTRACT TRUNCATED AT 250 WORDS) |
| first_indexed | 2024-12-18T01:55:59Z |
| format | Article |
| id | doaj.art-de8de5568ace4038b90752cda12b4d93 |
| institution | Directory Open Access Journal |
| issn | 0022-2275 |
| language | English |
| last_indexed | 2024-12-18T01:55:59Z |
| publishDate | 1985-11-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Lipid Research |
| spelling | doaj.art-de8de5568ace4038b90752cda12b4d932022-12-21T21:24:55ZengElsevierJournal of Lipid Research0022-22751985-11-01261112851293Influence of lecithin acyl chain composition on the kinetics of exchange between chylomicrons and high density lipoproteinsG M PattonS J RobinsJ M FasuloS B ClarkThe kinetics of lecithin exchange between native lipoproteins was characterized for individual molecular species of lecithins of rat mesenteric lymph chylomicrons and rat plasma HDL. Studies were performed in the absence of lipid transfer proteins. Donor (chylomicrons) and acceptor (HDL) particles were present in ratios of 1:1 and 1:10 with respect to total phospholipid. Biphasic exchange kinetics were observed for all major lecithins common to chylomicrons and HDL at both proportions of donor to acceptor particles. During the early rapid phase of exchange, complete in about 30 min, 40-60% of the total lecithin pool was exchanged. Initial exchange rates were most rapid for the more hydrophilic species of the major lecithins normally present in both lipoproteins. Calculated activation energies correspondingly were least for a diunsaturated lecithin (18:1-20:4), intermediate for lecithins were 16:0 in position-1 (16:0-18:2 and 16:0-20:4), and highest for analogous lecithins with 18:0 in position-1. A 10-fold increase in the ratio of acceptor to donor particles affected neither the biphasic nature of the exchange nor the rates of exchange of individual molecular species (consistent with exchange by diffusion rather than by particle collisions). Total equilibration of individual molecular lecithin species was achieved by 24 hr (37 degrees C, donor to acceptor ratio of 1:1) with only a small change in the relative mass of lecithins in chylomicrons and HDL. Novel lecithins containing 18:3, incorporated into chylomicrons, were found to exchange exceedingly rapidly.(ABSTRACT TRUNCATED AT 250 WORDS)http://www.sciencedirect.com/science/article/pii/S0022227520342541 |
| spellingShingle | G M Patton S J Robins J M Fasulo S B Clark Influence of lecithin acyl chain composition on the kinetics of exchange between chylomicrons and high density lipoproteins Journal of Lipid Research |
| title | Influence of lecithin acyl chain composition on the kinetics of exchange between chylomicrons and high density lipoproteins |
| title_full | Influence of lecithin acyl chain composition on the kinetics of exchange between chylomicrons and high density lipoproteins |
| title_fullStr | Influence of lecithin acyl chain composition on the kinetics of exchange between chylomicrons and high density lipoproteins |
| title_full_unstemmed | Influence of lecithin acyl chain composition on the kinetics of exchange between chylomicrons and high density lipoproteins |
| title_short | Influence of lecithin acyl chain composition on the kinetics of exchange between chylomicrons and high density lipoproteins |
| title_sort | influence of lecithin acyl chain composition on the kinetics of exchange between chylomicrons and high density lipoproteins |
| url | http://www.sciencedirect.com/science/article/pii/S0022227520342541 |
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