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Pharmaceutical Research

, Volume 9, Issue 2, pp 260–265 | Cite as

Prolonged Systemic Delivery of Peptide Drugs by Long-Circulating Liposomes: Illustration with Vasopressin in the Brattleboro Rat

  • Martin C. Woodle
  • Gert Storm
  • Mary S. Newman
  • Jill J. Jekot
  • Lila R. Collins
  • Francis J. Martin
  • Francis C. Szoka, Jr
Article

Abstract

The value of novel systemically long-circulating liposomes to prolong the duration of an antidiuretic hormone, arg8-vasopressin (VP), was investigated as a representative of low molecular weight pep-tides with rapid clearance. Cholesterol content was found to have a controlling effect on VP release in serum. Three types of liposomes were selected for urine production measurements in VP deficient Brattleboro rats. One contained phosphatidylserine (PS), which was rapidly cleared from the circulation. In the other two liposomes, the PS component was replaced by either phosphatidylglycerol or a novel phospholipid derivatized with polyethylene glycol (PEG); both showing prolonged circulation. Free VP (up to 8 µg/kg) gave reduced urine production for less than 24 hr. The PG formulation exhibited a dose-dependent prolonged duration of bioactivity of up to 4 days. Substitution of PEG-PE resulted in a 2-day delay followed by a prolonged duration of bioactivity for over 4 days. The duration of the prolonged bioactivity was not dose dependent but the amplitude was. This is attributed to VP release from liposomes which have distributed intact to another compartment without having been taken up by the RES. By balancing liposome circulation time, release rate, and dose, long-circulating liposomes can be applied to prolong the biological activity of a therapeutic peptide.

antidiuretic hormone Brattleboro rat liposomes polyethylene glycol (PEG) 

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Copyright information

© Plenum Publishing Corporation 1992

Authors and Affiliations

  • Martin C. Woodle
    • 1
  • Gert Storm
    • 1
    • 2
  • Mary S. Newman
    • 1
  • Jill J. Jekot
    • 1
  • Lila R. Collins
    • 1
  • Francis J. Martin
    • 1
  • Francis C. Szoka, Jr
    • 3
  1. 1.Liposome Technology Inc.Menlo Park
  2. 2.Department of PharmaceuticsUniversity of UtrechtUtrechtThe Netherlands
  3. 3.Department of PharmacyUniversity of CaliforniaSan Francisco

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