Pharmacodynamics of Selective Inhibition of γ-Secretase by Avagacestat

被引:56
作者
Albright, Charles F. [1 ]
Dockens, Randy C. [2 ]
Meredith, Jere E., Jr. [1 ]
Olson, Richard E. [1 ]
Slemmon, Randy [2 ]
Lentz, Kimberley A. [1 ]
Wang, Jun-Sheng [3 ]
Denton, R. Rex [1 ]
Pilcher, Gary [1 ]
Rhyne, Paul W. [3 ]
Raybon, Joseph J. [1 ]
Barten, Donna M. [1 ]
Burton, Catherine [1 ]
Toyn, Jeremy H. [1 ]
Sankaranarayanan, Sethu [1 ]
Polson, Craig [1 ]
Guss, Valerie [1 ]
White, Randy [4 ]
Simutis, Frank [4 ]
Sanderson, Thomas [4 ]
Gillman, Kevin W. [1 ]
Starrett, John E., Jr. [1 ]
Bronson, Joanne [1 ]
Sverdlov, Oleksandr [3 ]
Huang, Shu-Pang [3 ]
Castaneda, Lorna [3 ]
Feldman, Howard [1 ]
Coric, Vlad [1 ]
Zaczek, Robert [1 ]
Macor, John E. [1 ]
Houston, John [1 ]
Berman, Robert M. [1 ]
Tong, Gary [2 ]
机构
[1] Bristol Myers Squibb Co, Res & Dev, Wallingford, CT 06492 USA
[2] Bristol Myers Squibb Co, Hopewell Facil, Res & Dev, Pennington, NJ USA
[3] Bristol Myers Squibb Co, Res & Dev, Lawrenceville, NJ USA
[4] Bristol Myers Squibb Co, Dept Drug Safety Evaluat, Mt Vernon Facil, Res & Dev, Evansville, IN USA
关键词
4 BASIC MODELS; CEREBROSPINAL-FLUID; ALZHEIMERS-DISEASE; HEALTHY-YOUNG; MOUSE MODEL; NOTCH; BMS-708163; DISCOVERY; MECHANISM; RECEPTOR;
D O I
10.1124/jpet.112.199356
中图分类号
R9 [药学];
学科分类号
1007 ;
摘要
A hallmark of Alzheimer's disease (AD) pathology is the accumulation of brain amyloid beta-peptide (A beta), generated by gamma-secretase-mediated cleavage of the amyloid precursor protein (APP). Therefore, gamma-secretase inhibitors (GSIs) may lower brain A beta and offer a potential new approach to treat AD. As gamma-secretase also cleaves Notch proteins, GSIs can have undesirable effects due to interference with Notch signaling. Avagacestat (BMS-708163) is a GSI developed for selective inhibition of APP over Notch cleavage. Avagacestat inhibition of APP and Notch cleavage was evaluated in cell culture by measuring levels of A beta and human Notch proteins. In rats, dogs, and humans, selectivity was evaluated by measuring plasma blood concentrations in relation to effects on cerebrospinal fluid (CSF) A beta levels and Notch-related toxicities. Measurements of Notch-related toxicity included goblet cell metaplasia in the gut, marginal-zone depletion in the spleen, reductions in B cells, and changes in expression of the Notch-regulated hairy and enhancer of split homolog-1 from blood cells. In rats and dogs, acute administration of avagacestat robustly reduced CSF A beta 40 and A beta 42 levels similarly. Chronic administration in rats and dogs, and 28-day, single- and multiple-ascending-dose administration in healthy human subjects caused similar exposure-dependent reductions in CSF A beta 40. Consistent with the 137-fold selectivity measured in cell culture, we identified doses of avagacestat that reduce CSF A beta levels without causing Notch-related toxicities. Our results demonstrate the selectivity of avagacestat for APP over Notch cleavage, supporting further evaluation of avagacestat for AD therapy.
引用
收藏
页码:686 / 695
页数:10
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