Small Molecule Screening for CTC Expansion and Inhibition
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Solution Overview
Problem
The rarity and fragility of circulating tumor cells (CTCs) pose significant challenges for their ex vivo expansion, limiting downstream functional analysis and therapeutic screening due to their low numbers and vulnerability to oxidative stress.
Innovation Solution
The development of screening methods to identify small molecule compounds such as N-acetylcysteine (NAC) and 3-(3-(2-(3,4,5-Trimethoxy-phenylamino)-7H-pyrrolo[2,3-d]pyrimidin-7-yl)propionitrile, which promote or inhibit CTC proliferation, facilitating their expansion and subsequent functional analyses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If CTCs are isolated and cultured ex vivo, then functional analysis and therapeutic screening can be performed, but the rarity and fragility of CTCs limit their expansion and survival
Solution Approach 1:
The patent introduces small molecule compounds as intermediaries that mediate between the CTCs and the culture environment. These compounds act as protective agents that facilitate CTC expansion by mitigating oxidative stress and creating a more favorable culture condition, thereby enabling functional analysis of the rare CTC cells without requiring large numbers
Solution Approach 2:
The patent applies parameter changes by modifying the chemical environment of CTC culture through addition of small molecule compounds. By changing parameters such as oxidative stress levels, nutrient availability, and chemical signaling in the culture medium, the patent enables improved CTC survival and expansion while maintaining their functional characteristics
2Productivity
If small molecule compounds are screened to identify promoters of CTC proliferation, then ex vivo expansion can be facilitated, but the complexity of screening and evaluation increases
Solution Approach 1:
The patent implements self-service by using the CTCs themselves to evaluate the activity of small molecule compounds. The CTCs serve as both the subject of study and the assay reagent, automatically indicating compound activity through their proliferation or inhibition responses, thereby simplifying the screening system without requiring complex external evaluation mechanisms
Solution Approach 2:
The patent incorporates feedback mechanisms where the CTC response (proliferation or inhibition) to small molecule compounds provides direct information about compound activity. This feedback loop enables iterative optimization of screening conditions and identification of effective compounds, reducing the complexity of the overall screening process by using biological feedback rather than complex instrumental analysis
3Reliability
If CTCs are subjected to oxidative stress during isolation and culture, then their vulnerability increases and survival decreases, but standard isolation procedures cannot be avoided
Solution Approach 1:
The patent applies preliminary anti-action by pre-treating CTCs or the culture environment with antioxidant small molecule compounds before and during the isolation and culture procedures. This preemptive measure counteracts the oxidative stress that inevitably occurs during standard isolation procedures, thereby protecting CTC survival without requiring modification of the isolation protocols themselves
Solution Approach 2:
The patent converts the harmful effect of oxidative stress into a beneficial outcome by using the stress response as a selection mechanism. Small molecule compounds that enhance CTC survival under oxidative stress conditions are identified, and these compounds simultaneously protect CTCs during isolation while enabling their expansion in culture, thereby transforming the harmful stress into an opportunity for identifying protective agents
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
These compounds effectively enhance the ex vivo expansion of CTCs, allowing for robust screening systems and maintaining tumorigenicity, while also inhibiting CTC growth and inducing senescence, thereby advancing the understanding and treatment of cancer.
Implementation Method 1
N-acetylcysteine (NAC) and other antioxidants identified using the screening methods of the disclosure can promote ex vivo expansion of single CTCs
Implementation Method 2
3-(3-(2-(3,4,5-Trimethoxy-phenylamino)-7H-pyrrolo[2,3-d]pyrimidin-7-yl)phenyl)propionitrile identified using the screening methods of the disclosure can inhibit proliferation and decrease survivability of CTCs
Data Source
AI summary
The disclosure provides screening methods to identify small molecule compounds that can promote single circulating tumor cells (CTCs) proliferation, or alternatively inhibit proliferation by CTCs, and uses thereof, including as treatment options for cancer.