Abstract
The administration of mTNFα and hIL-1α was investigated for their potential to increase the anti-tumor activity of AMN-anti-Ly-2.1 against the Ly-2.1+ murine thymoma ITT(1) 75 NS E3. Dose response studies using mTNFα alone demonstrated a single 10μg iv injection produced 30% inhibition in tumor size while 3 doses of 1μg administered on alternative days produced 70% tumor inhibition. By contrast, hIL-1α was unable to significantly reduce E3 tumor size using single doses up to 10μg or a total of 30μg administered in 3 doses (iv or ip). However, intratumor injection of hIL-1α (20μg injected in 2 doses) produced 20% inhibition in tumor size. Combination therapy using AMN immunoconjugates with mTNFα showed enhanced antitumor activity compared to each agent alone. Biodistribution studies revealed that anti-tumor activity, was due to increased localization (2–3 fold) of AMN immunoconjugates in the presence of mTNF-α whereas huIL-1α was without effect unless accompanying toxicity was seen. Clearly for this tumor, mTNFα potentiated the effects of AMN immunoconjugates. Despite the shared biological properties of these cytokines, mTNFα is superior to hIL-α for augmenting drug immunoconjugate.
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Abbreviations
- AMN:
-
Aminopterin
- CBF1 :
-
(C57BL6xBALB/c)F1 mice
- DMSO:
-
Dimethyl sulfoxide
- E3:
-
ITT(1)75NS E3
- HAMA:
-
human-anti-mouse antibody
- i.p.:
-
intraperitoneal(ly)
- I.T.:
-
intratumor
- i.v.:
-
intravenous(ly)
- hIL-1α :
-
recombinant human Interleukin-1-alpha
- MoAb:
-
monoclonal antibody
- PBS:
-
phosphate buffered saline
- SE:
-
standard error
- s.c.:
-
subcutaneous(ly)
- mTNF:
-
recombinant murine tumor necrosis factor-alpha
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Krauer, K.G., Pietersz, G.A. The comparative effects of IL-1 and TNF on AMN-anti-Ly 2.1 immunoconjugate therapy. Biotherapy 6, 139–147 (1993). https://doi.org/10.1007/BF01877427
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DOI: https://doi.org/10.1007/BF01877427