Abstract:
:The acute hemorrhagic necrosis of tumor nodules caused by the systemic administration of recombinant human tumor necrosis factor alpha (rhTNF-alpha) has been partially attributed to changes in tumor neovascularity. In this study, the effects of rhTNF-alpha were tested on primary autochthonous sarcomas induced in C57BL/6 mice by 3-methylcholanthrene, on spontaneous mammary tumors in C3H/HEN mammary tumor virus positive mice, and on the rejection of normal tissue transplants at different stages of maturity in C57BL/6 mice. Primary i.m. tumors induced by injection of 3-methylcholanthrene grew slowly over a 3-month period and became acutely necrotic after i.v. injection of rhTNF-alpha (2-6 micrograms). In addition, rhTNF-alpha caused a reduction in tumor area of 24% over 10 days compared to a 43% increase in tumor area in control mice receiving excipient (P2 less than 0.01). Histopathologically, tumors underwent central necrosis with a neutrophilic infiltration as was observed previously for serially transplanted tumors following rhTNF-alpha administration. Spontaneous, virally induced mammary tumors underwent a 11% regression on administration of rhTNF-alpha (4-6 micrograms) compared to a 24% growth in mice receiving excipient (P2 less than 0.05). Normal mice were grafted with syngeneic (C57BL/6) or partially allogeneic (C57BL/10 to C57BL/6) skin and were treated with a single dose of rhTNF-alpha (5-20 micrograms) i.v. at either 5, 10, or 15 days posttransplantation. rhTNF-alpha administration had no effect on the integrity of the skin grafts at any maturation point tested (syngeneic graft survival at 60 days: excipient, 35 of 36 versus 20 micrograms rhTNF-alpha, 35 of 36; allogeneic graft survival: excipient, 46 +/- 8 days versus 20 micrograms rhTNF-alpha, 48 +/- 10 days). In addition, rhTNF-alpha had no effect on the integrity of a syngeneic neonatal s.c. heart graft (graft survival at 60 days, excipient, 35 of 36 versus rhTNF-alpha, 30 of 33). Thus, although rhTNF-alpha administration led to marked necrosis and growth inhibition of vascularized tumor, no effect was observed on vascularized normal tissue transplants. To evaluate possible systemic effects of the tumor bearing state on the maturing neovascularity of normal tissue grafts, the three transplant models were studied in mice bearing a 9-day established MCA-106 s.c. sarcoma. After treatment with rhTNF-alpha (2-6 micrograms), acute necrosis and tumor size reduction was apparent in the s.c. tumors; however, no effect was seen in any of the normal tissue transplants.(ABSTRACT TRUNCATED AT 400 WORDS)
journal_name
Cancer Resjournal_title
Cancer researchauthors
McIntosh JK,Mulé JJ,Travis WD,Rosenberg SAsubject
Has Abstractpub_date
1990-04-15 00:00:00pages
2463-9issue
8eissn
0008-5472issn
1538-7445journal_volume
50pub_type
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