A potential role for PTTG/securin in the developing human fetal brain

Area of Science:

• Neuroscience
• Cell Biology
• Developmental Biology

Background:

• Human securin (PTTG) is an oncogene with known roles in cell cycle regulation and cell transformation.
• PTTG influences fibroblast growth factor-2 (FGF-2) secretion, a key regulator of central nervous system (CNS) development.
• PTTG expression has been observed in the developing murine fetal brain.

Purpose of the Study:

• To investigate the expression and function of securin and FGF-2 in the developing human fetal brain.
• To analyze securin's role in a human fetal neuronal cell line (NT-2).

Main Methods:

• Immunocytochemistry was used to assess securin and FGF-2 protein expression in fetal and adult human cerebral cortex.
• Proliferation markers like PCNA were analyzed in relation to securin levels.
• NT-2 cells were utilized to study the functional effects of securin on FGF-2 expression and cell proliferation.

Main Results:

• Securin expression was significantly lower in the first and second trimester fetal cerebral cortex compared to adult cortex.
• FGF-2 protein levels were concordantly lower in fetal cortex.
• High securin levels in adult cortex correlated with absent cell proliferation, while low, transient securin expression promoted proliferation in NT-2 cells.

Conclusions:

• Human PTTG/securin may play a crucial role in modulating cell proliferation during human neurogenesis.
• Securin influences FGF-2 expression, potentially impacting neuronal development.
• The dual effect of securin on cell proliferation (promoting at low levels, inhibiting at high levels) suggests a complex regulatory role in the developing brain.