Abstract:
:Administration of nerve growth factor (NGF) to the offspring of Sprague-Dawley rats transplacentally exposed to 50 mg/kg ethylnitrosourea on the 20th day of gestation resulted in a significant reduction of trigeminal and peripheral nerve neurinomas. Forty, 60, and 80 micrograms of NGF was administered in five s.c. doses, one dose on each of days 12-16, 90-94, and 210-214 postnatally. Of the 34 rats in the NGF-treated group, 11 animals were affected with trigeminal nerve neurinomas as compared to 18/34 in the NGF-untreated group (P less than 0.05). In the peripheral nerves (spinal cord nerve roots) there were five and 11 neurinomas, respectively, in each group of 34 rats. When the total numbers of neurinomas (trigeminal and peripheral nerves) between these groups were compared (16/34 versus 29/34), the significance of neurinoma reduction was P less than 0.01. Five trigeminal and two peripheral neurinomas in the NGF-untreated group were shown by immunohistochemical staining to contain nerve growth factor receptor protein, whereas none of the neurinomas in the NGF-treated group were positive for the receptor protein. The results obtained from this experiment lend support to the hypothesis that NGF has the capability to reduce the oncogenic consequences of ethylnitrosourea exposure perhaps by the process of maturation and/or differentiation of the transformed cells, and that this effect may depend upon the presence of receptor binding sites.
journal_name
Cancer Resjournal_title
Cancer researchauthors
Raju NR,Koestner A,Marushige K,Lovell KL,Okazaki Dsubject
Has Abstractpub_date
1989-12-15 00:00:00pages
7120-3issue
24 Pt 1eissn
0008-5472issn
1538-7445journal_volume
49pub_type
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