Intracerebral C6 glioma model in female hairless rats: assessment by using MRI and follow-up of irradiation.

An experimental intracerebral C6 glioma model in immunosuppressed female hairless rats has been developed. The rate of tumor uptake was evaluated by magnetic resonance imaging (MRI), using specific sequences without gadolinium enhancement. Twenty-four hours before intracerebral transplantation, a control cranial MRI was carried out and rats underwent a total body irradiation (TBI).

p29ING4 and p28ING5 bind to p53 and p300, and enhance p53 activity.

We identified and characterized two new ING family genes, p29ING4 and p28ING5,coding for two proteins of 249 and 240 amino acids, respectively. Both p29ING4 and p28ING5 proteins have a plant homeodomain finger motif also found in other ING proteins, and which is common in proteins involved in chromatin remodeling. p29ING4 or p28ING5 overexpression resulted in a diminished colony-forming efficiency, a decreased cell population in S phase, and the induction of apoptosis in a p53-dependent manner.

Human malignant glioma cell lines are sensitive to low radiation doses.

Malignant gliomas display aggressive local behavior and are not cured by existing therapy. Some cell lines that are considered radioresistant respond to low radiation doses (<1 Gy) with increased cell killing (low-dose hypersensitivity). In our study, 4 of 5 human glioma cell lines exhibited significant X-ray sensitivity at doses below 1 Gy.

A novel PHD-finger motif protein, p47ING3, modulates p53-mediated transcription, cell cycle control, and apoptosis.

A candidate tumor suppressor gene, p33ING1, was previously identified by using the genetic suppressor element methodology. p33ING1 cooperates with p53 and plays a significant role in p53-mediated cellular processes. Recently, we have identified p33ING2, which shows a sequence homology similar to p33ING1 and modulates p53 function.