Anionically Substituted Cyclodextrin Complexes for Nephrotoxic Drug Delivery
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Solution Overview
Problem
Nephrotoxic drugs cause renal damage through various mechanisms, leading to acute oliguric renal failure, and existing treatments are inadequate in reducing this damage effectively.
Innovation Solution
Compositions comprising an anionically substituted oligosaccharide, a nephrotoxic drug, and a pharmaceutically acceptable carrier, where the oligosaccharide is present in an amount effective to substantially inhibit the nephrotoxic effect of the drug, and methods involving the use of polyanionic oligosaccharides like cyclic polysaccharide sulfates to reduce renal toxicity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If nephrotoxic drugs are administered to treat disease, then therapeutic effect is achieved, but renal damage occurs
Solution Approach 1:
The patent uses cyclodextrin derivatives as intermediary substances that form inclusion complexes with nephrotoxic drugs. The cyclodextrin molecule acts as a mediator, with its hydrophobic cavity accommodating the drug molecule while the hydrophilic exterior maintains solubility. This intermediary structure prevents direct contact between the toxic drug and renal tissue, thereby reducing nephrotoxicity while preserving therapeutic effects.
Solution Approach 2:
The patent modifies the chemical parameters of cyclodextrin molecules by introducing various substituents (hydroxyl, carboxyl, sulfate, sulfonate groups) at different positions and degrees. These parameter changes alter the solubility, stability, and nephroprotective properties of the complexing agent, enabling optimization of the balance between therapeutic efficacy and renal safety for different drugs.
2Productivity
If high dose nephrotoxic drugs are used to improve therapeutic outcome, then disease treatment efficacy increases, but nephrotoxicity increases
Solution Approach 1:
By employing cyclodextrin derivatives as mediators, the patent enables administration of higher drug doses required for effective treatment of severe conditions. The mediator protects renal tissue from direct drug exposure, allowing therapeutic doses to be maintained or increased without proportionally increasing nephrotoxicity, thus improving treatment outcomes for serious diseases.
Solution Approach 2:
The cyclodextrin derivative forms a protective complex with the nephrotoxic drug before the drug reaches renal tissue. This beforehand cushioning effect absorbs or mitigates the toxic impact, creating a buffer that allows higher drug doses to be administered safely, thereby improving therapeutic efficacy without linearly increasing renal damage.
3Device complexity
If conventional formulations are used, then drug delivery is simple, but nephrotoxicity is not effectively reduced
Solution Approach 1:
The patent creates composite pharmaceutical formulations consisting of cyclodextrin derivatives combined with nephrotoxic drugs. This composite material approach integrates the drug's therapeutic properties with the cyclodextrin's nephroprotective and solubility-enhancing characteristics, providing a unified formulation that simultaneously addresses toxicity and delivery requirements without excessive complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The described compositions and methods significantly reduce renal damage by maintaining the drug in solution and minimizing its toxic effects on the kidneys, as demonstrated by reduced pathology scores in animal models treated with nephrotoxic drugs like methotrexate, doxorubicin, and cisplatin.
Implementation Method 1
compositions comprising an anionically substituted oligosaccharide, a nephrotoxic drug and a pharmaceutically acceptable carrier, where the oligosaccharide is present in an amount effective for substantially inhibiting the nephrotoxic effect of the drug
Data Source
AI summary
The present invention provides compositions and methods to reduce renal damage caused by nephrotoxic drugs. The invention provides compositions comprising an anionically substituted cyclodextrin, a nephrotoxic drug and a pharmaceutically acceptable carrier, where the cyclodextrin is present in an amount effective for substantially inhibiting the nephrotoxic effect of the drug.