Related Experiment Videos
Role of nerve growth factor in ethylnitrosourea-induced neural carcinogenesis
Abstract:
The sensitivity of the rat nervous system to malignant transformation by ethylnitrosourea (ENU) is a function of age at treatment. From late gestation, nervous structures decrease in sensitivity with age as non-neural structures increase in susceptibility. There is a decrease in the proportion of neural tumors induced by ENU and an increase in survival time when nerve growth factor (NGF) levels are elevated in the fetal or neonatal stage. If antibodies directed against mouse beta-NGF (anti-NGF) are administered prior to neonatal ENU treatment, neural tumors appear earlier, although in the same proportion as with treatment by ENU alone. This effect is not observed if the ENU is administered first. This phenomenon seems to be attributed to an increased number of trigeminal nerve neurinomas, which have a shorter latent period than other nervous system tumors. The induced neurological tumors in rats treated neonatally with anti-NGF prior to ENU seem to be almost exclusively neurinomas in the peripheral nervous system. Fetal anti-NGF treatment leads to an increased number of intracerebral gliomas and a longer survival time, which corresponds to the longer latent period of these tumors. The role of NGF in the sensitivity of the rat nervous system to carcinogenesis by ENU and its possible implications in the development of the nervous system discussed.
Insights
Nerve growth factor (NGF) influences rat nervous system sensitivity to ethylnitrosourea (ENU) carcinogens. Manipulating NGF levels affects tumor type and onset, impacting neurodevelopmental cancer research.
Area of Science:
- Neuroscience
- Developmental Biology
- Toxicology
Background:
- The sensitivity of the rat nervous system to ethylnitrosourea (ENU) induced malignant transformation varies with age.
- Non-neural tissues become more susceptible to ENU with age, while neural structures become less sensitive from late gestation onwards.
Purpose of the Study:
- To investigate the role of nerve growth factor (NGF) in modulating the rat nervous system's susceptibility to ENU-induced carcinogenesis.
- To explore the implications of NGF levels on the types and latency of induced neural tumors.
Main Methods:
- Administration of ethylnitrosourea (ENU) at different ages and in conjunction with nerve growth factor (NGF) manipulation (elevated levels or anti-NGF antibodies).
- Observation and analysis of tumor types (neurinomas, gliomas), incidence, and survival times in treated rats.
Main Results:
- Elevated NGF levels in fetal or neonatal stages decreased the proportion of neural tumors and increased survival time after ENU treatment.
- Pre-neonatal treatment with anti-NGF antibodies prior to ENU accelerated neural tumor appearance, primarily trigeminal nerve neurinomas.
- Fetal anti-NGF treatment increased intracerebral gliomas and prolonged survival, correlating with the longer latency of these tumors.
Conclusions:
- Nerve growth factor (NGF) plays a significant role in the age-dependent sensitivity of the rat nervous system to ENU carcinogenesis.
- Modulation of NGF levels can alter the susceptibility and tumor profile, offering insights into neurodevelopment and cancer mechanisms.