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Poly I-Mercapto Poly C: antiviral, anticellular, and pharmacologic effects
Research Communications in Chemical Pathology and Pharmacology
|September 1, 1984
Summary
Mercaptopolycytidylic acid (Poly I-MPC) shows promise as an antiviral and antitumor agent. This modified nucleic acid induces interferons, inhibits DNA synthesis, and exhibits cytotoxicity against human tumor cells with reduced toxicity compared to Poly I-Poly C.
Area of Science:
- Immunology
- Virology
- Oncology
- Biochemistry
Background:
- Polycytidylic acid can be thiolated to form mercaptopolycytidylic acid (MPC).
- Double-stranded Poly I-MPC is formed by annealing MPC with polyinosinic acid (Poly I).
- Poly I-Poly C is a known interferon inducer with associated toxicities.
Purpose of the Study:
- To evaluate the interferon-inducing potential of Poly I-MPC.
- To assess the in vivo toxicity of Poly I-MPC in animal models.
- To investigate the effects of Poly I-MPC on DNA synthesis and human tumor cell lines.
Main Methods:
- Induction of human alpha, beta, and gamma interferons.
- In vivo toxicity studies in mice, guinea pigs, and rabbits following FDA guidelines.
- Assessment of DNA synthesis inhibition in human lymphocytes.
- Evaluation of cytotoxicity and colony formation inhibition in human tumor cell lines.
Main Results:
- Poly I-MPC effectively induced human alpha, beta, and gamma interferons.
- Poly I-MPC demonstrated significantly lower weight loss, lethality, and pyrogenic effects compared to Poly I-Poly C in animal models.
- Poly I-MPC inhibited DNA synthesis in human lymphocytes, unlike Poly I-Poly C.
- Poly I-MPC exhibited cytotoxicity and inhibited colony formation in several human tumor cell lines.
Conclusions:
- Poly I-MPC is a potent inducer of human interferons.
- Poly I-MPC possesses a favorable toxicity profile compared to Poly I-Poly C.
- Poly I-MPC demonstrates significant potential as an antiviral and antitumor therapeutic agent due to its ability to inhibit DNA synthesis and its cytotoxic effects on tumor cells.