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A new death domain associated with gestational trophoblastic diseases induces apoptosis in distinct cell types
C I Dumur1, J A Almenara, S Durand
1Departamento de Bioquímica Clínica, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Argentina. cidumur@hsc.vcu.edu
Abstract:
Gestational trophoblastic diseases, like the complete hydatidiform mole (CHM), are a group of human interrelated neoplasms whose etiology and progression is poorly understood at the molecular level. We have previously reported the cloning and expression of a new tumor necrosis factor receptor (TNF-R) related transcript, named CHMS-1 that encodes a potential death domain. Here we show that ectopic expression of the putative CHMS-1 death domain specifically induced apoptosis in a dose-dependent manner, in trophoblastic (JEG-3) and non-trophoblastic (COS-7) cells. We also investigated the expression of apoptosis-related molecules such as Bcl-2 and p53 and demonstrated that Bcl-2 is repressed in CHM while p53 is overexpressed in CHM compared with persistent gestational trophoblastic tumors. Altogether, these data indicate that the CHMS-1 death domain is able to trigger apoptosis, thus suggesting that this new entity might be an important inducer of molar regression mechanisms in women.
Insights
A novel gene, CHMS-1, may induce apoptosis in gestational trophoblastic diseases. Its death domain triggers programmed cell death, potentially explaining molar regression mechanisms in women.
Area of Science:
- Molecular biology
- Oncology
- Cell biology
Background:
- Gestational trophoblastic diseases (GTDs), including complete hydatidiform mole (CHM), are neoplasms with poorly understood molecular mechanisms.
- A previously identified transcript, CHMS-1, encodes a potential tumor necrosis factor receptor (TNF-R) related death domain.
Purpose of the Study:
- To investigate the role of the CHMS-1 death domain in inducing apoptosis.
- To examine the expression of apoptosis-related molecules (Bcl-2, p53) in CHM.
Main Methods:
- Ectopic expression of the CHMS-1 death domain in trophoblastic (JEG-3) and non-trophoblastic (COS-7) cells.
- Analysis of apoptosis induction in a dose-dependent manner.
- Assessment of Bcl-2 and p53 expression levels.
Main Results:
- Ectopic expression of the CHMS-1 death domain induced apoptosis in both cell types.
- Bcl-2 expression was repressed in CHM.
- p53 was overexpressed in CHM compared to persistent gestational trophoblastic tumors.
Conclusions:
- The CHMS-1 death domain can trigger apoptosis, suggesting its potential role in molar regression.
- Differential expression of Bcl-2 and p53 in CHM indicates their involvement in the disease's pathogenesis.