Basigin (EMMPRIN/CD147) interacts with integrin to affect cellular architecture

Area of Science:

• Cell Biology
• Developmental Biology
• Molecular Biology

Background:

• Basigin, an IgG family glycoprotein, is known to stimulate matrix metalloproteinase secretion in human metastatic tumors.
• Its role in remodeling the extracellular matrix is well-established.
• However, intracellular functions of basigin remained largely unexplored.

Purpose of the Study:

• To investigate novel, matrix metalloproteinase-independent roles of basigin.
• To elucidate the function of basigin in intracellular architecture and cell structure maintenance.
• To explore the interaction between basigin and integrin in cellular organization.

Main Methods:

• Utilized Drosophila melanogaster as a model organism.
• Investigated basigin's function in cultured insect cells and photoreceptor cells.
• Examined the colocalization and genetic interaction of basigin and integrin.

Main Results:

• Basigin interacts with integrin and is essential for normal cell architecture in certain cell types.
• Basigin promotes cytoskeletal rearrangements and lamellipodia formation in cultured insect cells.
• Loss of basigin in photoreceptors caused defects in nuclear, ER, and mitochondrial positioning, and axon terminal swelling, indicating cytoskeletal disruption.

Conclusions:

• Basigin has intracellular roles in maintaining cell architecture and cytoskeletal organization, independent of extracellular matrix remodeling.
• The interaction between basigin and integrin is critical for basigin-mediated cellular architecture.
• Basigin and integrin may form complexes to organize internal cell structure.