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Trophic factors and central nervous system metastasis
1Department of Tumor Biology, University of Texas M.D. Anderson Cancer Center, Houston 77030, USA.
Cancer Metastasis Reviews
|December 1, 1995
Summary
Malignant cells invade the central nervous system (CNS) by responding to brain-derived factors. Neurotrophins and transferrin are key for tumor cell invasion, survival, and growth in the CNS.
Area of Science:
- Neuroscience
- Oncology
- Cell Biology
Background:
- Metastasis to the central nervous system (CNS) requires malignant cells to overcome multiple biological barriers.
- The blood-brain barrier (BBB) presents a significant obstacle for tumor cell invasion and survival within the CNS.
- Tumor cells must interact with and respond to factors produced by both the tumor and the CNS microenvironment.
Purpose of the Study:
- To elucidate the critical molecular interactions and factors enabling malignant cell metastasis to the CNS.
- To investigate the role of neurotrophins and transferrin in CNS tumor cell invasion and survival.
- To understand how tumor cells utilize and respond to CNS-derived and autocrine/paracrine factors.
Main Methods:
- Analysis of molecular mechanisms underlying malignant cell attachment to brain microvessel endothelial cells.
- Investigation of tumor cell responses to CNS-derived motility and invasion factors.
- Examination of neurotrophin and transferrin receptor expression in relation to invasive properties.
- Analysis of human CNS melanoma tumor biopsies to assess neurotrophin levels at the invasion front.
Main Results:
- Trophic factors, particularly neurotrophins, enhance tumor cell invasion by promoting basement membrane-degrading enzyme production.
- Brain-metastatic cells exhibit specific neurotrophin receptor expression and respond to CNS-secreted neurotrophins.
- Paracrine transferrin is crucial for CNS metastasis, with tumor cells showing high transferrin receptor expression.
- Increased neurotrophins were detected at the invasion front of human melanoma CNS metastases.
Conclusions:
- Successful CNS metastasis is a multi-step process involving tumor cell adaptation to the brain microenvironment.
- Neurotrophins and transferrin are critical mediators of tumor cell invasion, survival, and growth in the CNS.
- Tumor cell interactions with CNS cells and their responses to local factors are essential for brain metastasis formation.