This proposal is a competing continuation of the NIH grant R01 NS051335. The long term goal is to produce polypeptides that could cross the blood-brain barrier (BBB) and so be developed as central nervous system (CNS) therapeutics. The goal is achieved by modification of polypeptides with Pluronic copolymers (poly(ethylene oxide)-b-poly(propylene oxide)-b-poly(ethylene oxide)). The studies have focused on leptin, a candidate for the treatment of epidemic obesity. Leptin failure is mostly due to peripheral resistance - a loss of its ability to cross the BBB necessary to reach its receptors in the arcuate nucleus of the hypothalamus. The previous work produced a conjugate of leptin with Pluronic P85 that is centrally active, has a long half-life in blood, is enzymatically resistant, crosses the BBB by a non-saturable mechanism independently of the leptin transporter, and can exert effects on feeding and body weight after peripheral administration. This proposal will: 1). optimize modifications to produce superior leptin analogs with maximal BBB permeability, improved half-life in blood and high enzymatic resistance in brain and blood;2). identify mechanisms underlying enhanced permeability of leptin analogs in BBB;3). determine the permeability of modified leptin analogs across the BBB to select the best analogs for activity testing;and 4) determine the biological activity after intravenous injection of the best leptin analogs 3 in leptin sensitive (ob/ob) and leptin resistant (dietary obese) mouse models of obesity. Analogs completing this development will be a) active in brain, b) have favorable pharmacokinetics, c) be able to cross the BBB in obese mice, and d) reverse obesity after iv injection. Such analogs are candidates for clinical trials in human obesity.

Public Health Relevance

The long term goal is to produce polypeptides that could cross the blood-brain barrier (BBB) and so be developed as central nervous system (CNS) therapeutics. The goal is achieved by modification of polypeptides with Pluronic copolymers (poly(ethylene oxide)- b-poly(propylene oxide)-b-poly(ethylene oxide)).

Agency
National Institute of Health (NIH)
Institute
National Institute of Neurological Disorders and Stroke (NINDS)
Type
Research Project (R01)
Project #
5R01NS051334-09
Application #
8635395
Study Section
Brain Injury and Neurovascular Pathologies Study Section (BINP)
Program Officer
Bosetti, Francesca
Project Start
2005-04-01
Project End
2015-03-31
Budget Start
2014-04-01
Budget End
2015-03-31
Support Year
9
Fiscal Year
2014
Total Cost
$297,363
Indirect Cost
Name
University of North Carolina Chapel Hill
Department
None
Type
Schools of Pharmacy
DUNS #
608195277
City
Chapel Hill
State
NC
Country
United States
Zip Code
27599
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Price, Tulin O; Farr, Susan A; Yi, Xiang et al. (2010) Transport across the blood-brain barrier of pluronic leptin. J Pharmacol Exp Ther 333:253-63
Ducharme, Nicole; Banks, William A; Morley, John E et al. (2010) Brain distribution and behavioral effects of progesterone and pregnenolone after intranasal or intravenous administration. Eur J Pharmacol 641:128-34

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