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Expression analysis of zebrafish membrane type-2 matrix metalloproteinases during embryonic development
Rachel E Quick1, Julie A Dunlap, Jason R Jessen
1Division of Genetic Medicine/Department of Medicine, Vanderbilt University Medical Center, Nashville, TN 37232, USA.
Abstract:
Membrane tethered matrix metalloproteinases (MMPs) cleave a variety of extracellular matrix (ECM) and non-ECM targets and play important roles during embryonic development and tumor progression. Membrane tethered MMPs in particular are important regulators of both tissue invasion and morphogenesis. Much attention has been given to understanding the function of human and mouse MMP14 (also called membrane type-1 MMP, MT1-MMP) and our own data have linked zebrafish Mmp14 to the regulation of gastrulation cell movements. However, less is known regarding the expression and function of other membrane tethered MMPs. We report the cloning and gene expression analysis of zebrafish mmp15a and mmp15b (MT2-MMP) during early embryonic and larval development. Our data show that mmp15a exhibits limited expression prior to segmentation stages and is first detected in the tectum and posterior tailbud. At 24 hours post-fertilization (hpf) mmp15a localizes to the caudal hematopoietic tissue, pectoral fin buds, and mandibular arch. By contrast, mmp15b is strongly expressed during gastrula stages before becoming restricted to the polster and anterior neural plate. From 24 to 48 hpf, mmp15b expression is detected in the pharyngeal arches, fin buds, otic vesicle, pronephric ducts, proctodeum, tail epidermis, posterior lateral line primordia, and caudal notochord. During the larval period beginning at 72 hpf, mmp15b expression becomes restricted to the brain ventricular zone, pharyngeal arches, pectoral fins, and the proctodeum. Many of the mmp15-expressing tissues have been shown to express genes encoding components of the ECM including collagens, fibronectin, and laminins. Our data thus provide a foundation for uncovering the role of Mmp15-dependent pericellular proteolysis during zebrafish embryonic development.
Insights
This study details the gene expression of zebrafish mmp15a and mmp15b (MT2-MMP) during embryonic development. These membrane-tethered matrix metalloproteinases are crucial for tissue remodeling and development.
Area of Science:
- Developmental Biology
- Molecular Biology
- Biochemistry
Background:
- Membrane-tethered matrix metalloproteinases (MMPs) are vital for extracellular matrix (ECM) remodeling, influencing embryonic development and tumor progression.
- While MMP14 (MT1-MMP) function is well-studied, the roles of other membrane-tethered MMPs, like MMP15 (MT2-MMP), remain less understood.
- Previous research linked zebrafish Mmp14 to gastrulation, highlighting the need to investigate other MMPs in this model organism.
Purpose of the Study:
- To clone and analyze the gene expression patterns of zebrafish mmp15a and mmp15b during early embryonic and larval stages.
- To identify specific tissues and developmental time points where mmp15a and mmp15b are expressed.
- To lay the groundwork for understanding the functional roles of Mmp15 in zebrafish development.
Main Methods:
- Gene cloning and expression analysis using zebrafish embryos and larvae.
- Whole-mount in situ hybridization (WISH) to visualize mmp15a and mmp15b expression patterns.
- Correlation of mmp15 expression with known ECM component gene expression in developing tissues.
Main Results:
- mmp15a expression was observed in the tectum, posterior tailbud, caudal hematopoietic tissue, pectoral fin buds, and mandibular arch.
- mmp15b showed strong expression during gastrulation, later restricted to the polster, anterior neural plate, pharyngeal arches, fin buds, otic vesicle, pronephric ducts, proctodeum, tail epidermis, posterior lateral line primordia, and caudal notochord.
- During larval stages, mmp15b expression was confined to the brain ventricular zone, pharyngeal arches, pectoral fins, and proctodeum.
Conclusions:
- The distinct expression patterns of mmp15a and mmp15b suggest specialized roles during zebrafish development.
- The co-expression of mmp15 genes with ECM components indicates their involvement in tissue-specific ECM remodeling.
- These findings provide a crucial foundation for future studies on Mmp15-mediated pericellular proteolysis in embryonic development.
