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Updated: Jun 8, 2025
Laser Capture Microdissection of Mouse Embryonic Cartilage and Bone for Gene Expression Analysis
Published on: December 18, 2019
Filamin B knockdown impairs differentiation and function in mouse pre-osteoblasts via aberrant transcription and
Xi Wang1,2,3, Qiyu Jia2, Li Yu4
1State Key Laboratory of Pathogenesis, Prevention and Treatment of High Incidence Diseases in Central Asia, Clinical Medicine Institute, The First Affiliated Hospital of Xinjiang Medical University, Urumqi 830011, Xinjiang, China.
Objective:
Filamin B (FLNB) encodes an actin-binding protein that is known to function as a novel RNA-binding protein involved in cell movement and signal transduction and plays a pivotal role in bone growth. This study aimed to investigate possible FLNB function in the skeletal system by characterizing the effecs of FLNB knockdown in mouse preosteoblast cells.
Methods:
Stable FLNB MC3T3-E1 knockdown cells were constructed for RNA-seq and alternative splicing event (ASE) analysis of genes involved in osteoblast differentiation and function that may be regulated by FLNB. Standard transwell, MTT, ALP, qPCR, Western blot, and alizarin red staining assays were used to assess functional changes of FLNB-knockdown MC3T3-E1 cells.
Results:
Analysis of differentially expressed genes (DEGs) in FLNB knockdown cells revealed enrichment for genes related to osteoblast proliferation, differentiation and migration, such as ITGA10, Cebpβ, Grem1, etc. Alternative splicing (AS) analysis showed changes in the predominant mRNA isoforms of skeletal development-related genes, especially Tpx2 and Evc. Functional asslysis indicated that proliferation, migration, and differentiation were all inhibited upon FLNB knockdown in MC3T3-E1 cells compared to that in vector control cells.
Conclusions:
FLNB participates in regulating the transcription and AS of genes required for osteoblast development and function, consequently affecting growth and development in MC3T3-E1 cells.
Insights
Filamin B (FLNB) knockdown inhibits osteoblast proliferation, migration, and differentiation by regulating gene transcription and alternative splicing, impacting skeletal development. This highlights FLNB's crucial role in bone growth.
Area of Science:
- Molecular Biology
- Cell Biology
- Skeletal Biology
Background:
- Filamin B (FLNB) is an actin-binding protein with known roles in cell movement and signal transduction.
- FLNB also plays a critical role in bone growth and skeletal development.
- Its function as an RNA-binding protein in the skeletal system is not fully understood.
Purpose of the Study:
- To investigate the function of FLNB in the skeletal system.
- To characterize the effects of FLNB knockdown in mouse preosteoblast cells (MC3T3-E1).
- To identify genes and pathways regulated by FLNB during osteoblast differentiation.
Main Methods:
- Construction of stable FLNB knockdown MC3T3-E1 cells.
- RNA sequencing (RNA-seq) for gene expression and alternative splicing event (ASE) analysis.
- Functional assays including transwell migration, MTT, ALP activity, qPCR, Western blot, and alizarin red staining.
Main Results:
- FLNB knockdown led to the differential expression of genes involved in osteoblast proliferation, differentiation, and migration (e.g., ITGA10, Cebpβ, Grem1).
- Significant changes in alternative splicing (AS) of skeletal development-related genes, notably Tpx2 and Evc, were observed.
- Functional analyses demonstrated inhibited proliferation, migration, and differentiation in FLNB-knockdown cells compared to controls.
Conclusions:
- FLNB is involved in regulating gene transcription and alternative splicing essential for osteoblast development and function.
- FLNB knockdown negatively impacts the growth and development of MC3T3-E1 preosteoblast cells.
- These findings underscore FLNB's importance in skeletal development and osteogenesis.
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