PEG-Conjugated Indole Alkaloid for Solubility and Metabolic Stability

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Solution Overview

Problem

Existing indole alkaloids like vincamine and vinpocetine face issues with poor water solubility and unstable metabolism, limiting their effectiveness in treating diabetic complications and pulmonary fibrosis.

Innovation Solution

A novel indole alkaloid compound represented by formula I, conjugated with polyethylene glycol (PEG) to enhance water solubility and stability, is developed, along with a pharmaceutical composition and preparation method.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If indole alkaloids like vincamine and vinpocetine are used to treat diabetic complications and pulmonary fibrosis, then therapeutic effects are achieved, but water solubility is poor and metabolic stability is unstable

Engineering Contradiction:

Improvetherapeutic effectVSAvoidmetabolic stability

Core Design Contradiction:

ReliabilityVSStability of the object's composition

Solution Approach 1:

The patent applies composite material principles by combining indole alkaloid compounds with carrier materials to create a composite pharmaceutical composition. This composite structure allows the active indole alkaloid component to provide therapeutic effects while the carrier material provides improved solubility and metabolic stability, resolving the contradiction between therapeutic efficacy and compositional stability.

Inventive Principle:

Principle #40Composite materials

2Reliability

If indole alkaloids like vincamine and vinpocetine are used to treat diabetic complications and pulmonary fibrosis, then therapeutic effects are achieved, but water solubility is poor

Engineering Contradiction:

Improvetherapeutic effectVSAvoidwater solubility

Core Design Contradiction:

ReliabilityVSQuantity of substance

Solution Approach 1:

The patent uses composite material principles by formulating indole alkaloids with solubility-enhancing carrier materials. This composite approach maintains the therapeutic active ingredients while significantly improving their water solubility through the carrier system, resolving the contradiction between therapeutic effect and solubility.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent employs carrier materials as intermediary substances that mediate between the poorly soluble indole alkaloids and the aqueous environment. These carrier materials act as intermediaries that solubilize the active compounds without compromising their therapeutic activity, thereby resolving the solubility-therapeutic effect contradiction.

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS12600724B2Indole alkaloid and preparation method and use thereof

Publication Date: 2026.04.14 NANJING UNIV OF TRADITIONAL CHINESE MEDICINE

AI summary

A compound represented by formula (I) and a preparation method thereof, and a pharmaceutically acceptable salt thereof, a metabolic precursor thereof, a metabolite thereof, an isomer thereof or a prodrug thereof; experiments show that the indole alkaloid not only promotes axon growth of peripheral sensory neurons, improves the nerve conduction velocity and anesthesia symptom of diabetic rats, but also promotes healing of foot ulcer wounds of diabetic rats, thus having good therapeutic effects on diabetic complication peripheral neuropathy and diabetic feet; they also show that the indole alkaloid also obviously reduces a degree of pulmonary fibrosis induced by bleomycin in mice, and plays a role in protecting lung tissues.