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Updated: Sep 23, 2026
Using Whole Mount in situ Hybridization to Link Molecular and Organismal Biology
Published on: March 31, 2011
The expression of novel membrane-type matrix metalloproteinase isoforms is required for normal development of
Jinsong Zhang1, Shan Bai, Xiaoming Zhang
1Department of Anatomy and Cell Biology, University of Kansas Medical Center, Kansas City, KS 66160, USA.
Abstract:
Matrix metalloproteinases (MMPs) play important roles in the turnover of components of extracellular matrix (ECM) and in the processing of active and latent-signaling molecules bound to the ECM or associated with the cell surface. Through such actions, MMPs regulate a variety of cellular and developmental processes. Membrane-type matrix metalloproteinases (MT-MMPs) are of particular importance because they function in the immediate pericellular environment that modulates both cell-cell and cell-ECM interactions. In this study, we utilized zebrafish as a developmental model to study the role of MT-MMPs during early embryogenesis. We successfully isolated two isoforms of a MT-MMP homologue that are structurally similar to MT1-MMP. They have been named zebrafish MT-MMPalpha and beta. Zebrafish MT-MMPbeta is unique among vertebrate MT-MMPs in that it contains an Arg-Glu-Asp (RED) multiple-repeat motif in its linker region. Whole mount in situ analysis, RT-PCR, immunofluorescence, reporter analysis, Western blot analysis, and zymography indicated that MT-MMPalpha and beta were expressed through at least the first 72 h of development and that this expression was targeted to the cell surface. Functional studies using injection of either mRNA or morpholino antisense oligonucleotides resulted in a truncation of the cranial to caudal axis as monitored through 72 h post fertilization, indicating that zebrafish MT-MMPalpha and beta had an important role in embryonic development. Axis markers indicated that these effects likely involved processes occurring later than 10 h of embryogenesis.
Insights
Matrix metalloproteinases (MMPs) are crucial for embryonic development. Zebrafish MT-MMPalpha and beta, involved in cell-matrix interactions, showed essential roles in early embryogenesis, impacting axis formation.
Area of Science:
- Developmental Biology
- Molecular Biology
- Biochemistry
Background:
- Matrix metalloproteinases (MMPs) regulate extracellular matrix (ECM) turnover and signaling molecule processing.
- Membrane-type MMPs (MT-MMPs) are critical for pericellular interactions, influencing cell-cell and cell-ECM dynamics.
- Zebrafish serve as a valuable model for studying early embryogenesis and gene function.
Purpose of the Study:
- To investigate the role of MT-MMPs in early zebrafish embryogenesis.
- To isolate and characterize zebrafish MT-MMP homologues.
- To elucidate the functional significance of MT-MMPalpha and beta during embryonic development.
Main Methods:
- Isolation of two MT-MMP isoforms (zebrafish MT-MMPalpha and beta).
- Expression analysis using whole mount in situ hybridization, RT-PCR, immunofluorescence, reporter assays, Western blot, and zymography.
- Functional studies involving mRNA and morpholino antisense oligonucleotide injections.
Main Results:
- Zebrafish MT-MMPalpha and beta were identified and characterized, with beta possessing a unique RED motif.
- Expression of MT-MMPalpha and beta was detected on the cell surface throughout the first 72 hours of development.
- Functional studies revealed that MT-MMPalpha and beta are essential for proper cranial to caudal axis formation in zebrafish embryos, with effects observed after 10 hours of development.
Conclusions:
- Zebrafish MT-MMPalpha and beta play critical roles in embryonic development, particularly in axis formation.
- The identified MT-MMP isoforms are involved in cell surface-mediated processes crucial for embryogenesis.
- Further research into MT-MMP functions can provide insights into developmental processes and related pathologies.
