4-Substituted Piperidine Compounds for Axon Regeneration
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Solution Overview
Problem
Current treatments for nerve damage in the central nervous system (CNS) are limited in promoting axon growth and regeneration due to inhibitory substrates, and existing Rho kinase inhibitors have adverse effects, such as kidney toxicity.
Innovation Solution
Development of novel 4-substituted piperidine compounds that can penetrate membranes and promote neurite outgrowth on inhibitory substrates, specifically targeting Rho kinase to enhance axon regeneration and neuronal plasticity, with a focus on selective inhibition of ROCKII to minimize adverse effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing Rho kinase inhibitors are used to promote axon growth and regeneration, then neurite outgrowth is enhanced, but kidney toxicity and other adverse effects occur
Solution Approach 1:
The patent applies local quality by designing compounds with selective affinity for ROCKII isoform while minimizing interaction with ROCKI. This is achieved through specific molecular structure modifications at the piperidine 4-position that create isoform-selective binding characteristics, thereby enhancing therapeutic efficacy for CNS regeneration while reducing off-target toxic effects in kidney tissues
Solution Approach 2:
The patent employs parameter changes by systematically modifying chemical parameters of the piperidine core structure, particularly at the 4-substituent position. These structural parameter changes result in compounds with optimized pharmacokinetic properties including reduced kidney accumulation and enhanced blood-brain barrier penetration, thus improving the therapeutic index for CNS applications
2Reliability
If current treatments are used for nerve damage in the CNS, then some therapeutic effect is achieved, but axon growth and regeneration are limited due to inhibitory substrates
Solution Approach 1:
The patent applies preliminary anti-action by designing compounds that preemptively counteract the effects of inhibitory substrates in the CNS environment. The selective ROCKII inhibition prevents the formation of cytoskeletal barriers that normally block axon regeneration, thereby creating a permissive environment for neurite outgrowth before inhibitory mechanisms can fully manifest
Solution Approach 2:
The patent employs dynamics by utilizing the reversible nature of ROCKII inhibition to dynamically regulate cytoskeletal remodeling. The compounds enable transient suppression of ROCKII activity during critical periods of axon regeneration, allowing flexible adaptation to changing regenerative needs while maintaining normal physiological function when the compound is cleared
3Adaptability or versatility
If Rho kinase inhibitors are developed to promote neurite outgrowth, then neuronal plasticity is enhanced, but selective inhibition of ROCKII must be achieved to minimize adverse effects
Solution Approach 1:
The patent applies segmentation by dividing the Rho kinase target into its two isoform segments (ROCKI and ROCKII) and designing compounds that selectively target only the ROCKII segment. This is achieved through specific structural features at the piperidine 4-position that create steric and electronic complementarity with ROCKII's binding pocket while lacking affinity for ROCKI, thereby simplifying the selectivity challenge
Data Source
AI summary
Substituted piperidine compounds represented by the structure I are provided,wherein each of R1a, R1b, R1c, R1d, R1e, R1f, R1g, R1h, R2, R2A, R3, R4, A, X, a, x and n is as defined in the specification. Substituted piperidine compounds of structure I may permeate or penetrate across a nerve cell membrane into the interior of a nerve cell, may inhibit intracellular Rho kinase enzyme found in nerve cells in mammals, and may find utility in repair of damaged nerves in the central and peripheral nervous system of such mammals. These compounds may induce the regeneration or growth of neurites in mammalian nerve cells and may thereby induce regeneration of damaged or diseased nerve tissue. These compounds also find additional utility as antagonists of the enzyme Rho kinase in treatment of disease states in which Rho kinase is implicated. Pharmaceutical compositions containing these substituted piperidine compounds may be useful to promote neurite growth and in the treatment of diseases in which Rho kinase inhibition is indicated.