Trefoil factor-2, human spasmolytic polypeptide, promotes branching morphogenesis in MCF-7 cells

Area of Science:

• Cell biology
• Molecular biology
• Cancer research

Background:

• Trefoil factor (TFF) family members are implicated in epithelial repair and cancer.
• TFF1 and TFF3 influence cell motility and growth suppression.
• The in vivo role of TFF2, often co-expressed with TFF1 in gastric epithelia, remains largely undefined.

Purpose of the Study:

• To investigate the effects of TFF2 on epithelial and mesenchymal cell proliferation and morphogenesis.
• To elucidate the specific mechanisms by which TFF2 influences cell behavior.

Main Methods:

• Cell proliferation assays across various epithelial and mesenchymal cell lines.
• Morphogenesis assays using type I collagen lattices with MCF-7 breast carcinoma cells.
• Analysis of cell motility via videomicroscopy.
• Assessment of apoptosis using trypan blue exclusion and DNA fragmentation ELISA.

Main Results:

• TFF2 did not affect the proliferation of any tested cell lines.
• Low concentrations of TFF2 induced complex branching morphogenesis in MCF-7 cells within collagen lattices over 14-42 days.
• This morphogenic effect was dependent on the presence of TFF1 and abolished by specific antibodies.
• TFF2 inhibited apoptosis in MCF-7 cells by approximately 30%, promoting cell survival.
• TFF2 did not influence cell motility in MCF-7 cells, unlike TFF1.

Conclusions:

• TFF2 functions as a morphogen in specific contexts, notably in breast carcinoma cells (MCF-7), particularly when TFF1 is present.
• TFF2 promotes cell survival by inhibiting apoptosis, suggesting a complementary role to TFF1's motogenic effects.
• These findings offer insights into the differential roles of TFF family members in epithelial repair and neoplastic processes.