简介：
Overview
This protocol describes how to mimic the suckling-to-weaning transition in vitro using mouse late fetal intestinal organoids cultured for 30 days. This model allows for the study of molecular mechanisms involved in gut maturation.
Key Study Components
Area of Science
- Neuroscience
- Developmental Biology
- Cell Culture Techniques
Background
- Intestinal maturation is crucial during the suckling-to-weaning transition.
- Using fetal intestinal cells can reduce the need for experimental animals.
- Primary intestinal cells from late developmental stages are essential for this model.
- The protocol outlines the dissection and culture of intestinal organoids.
Purpose of Study
- To develop an in vitro model for studying gut maturation.
- To analyze the effects of external factors on intestinal development.
- To provide insights into the molecular mechanisms of maturation.
Methods Used
- Dissection of intestines from late fetal mice.
- Culture of intestinal crypts in extracellular matrix gel.
- RNA and protein isolation for analysis.
- Assessment of enzyme activity and gene expression over time.
Main Results
- Fetal organoids matured to an adult state after 30 days.
- Distinct expression of proximal and distal markers was observed.
- Extrinsic factors like dexamethasone influenced maturation.
- Gene expression of adult markers increased while fetal markers decreased.
Conclusions
- Late fetal stage organoids are capable of transitioning to adult organoids in vitro.
- This model can help identify modulators of intestinal maturation.
- It offers a valuable alternative to traditional animal studies.
What is the significance of using late fetal intestinal cells?
Late fetal intestinal cells are crucial for achieving proper maturation in vitro, mimicking the natural developmental process.
How does this protocol reduce the use of experimental animals?
By using an in vitro model, researchers can study gut maturation without relying solely on live animal experiments.
What external factors were tested in this study?
Dexamethasone was used as an example of an external factor that can accelerate intestinal maturation.
How long does the culture process take?
The culture process lasts for approximately 30 days to achieve maturation.
What are the main markers analyzed in this study?
Proximal markers like Onecut2 and Gata4, and distal markers such as Fabp6 and Guca2a were analyzed.
What is the potential application of this model?
This model can be used to study the effects of various modulators on intestinal maturation and development.
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