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Related Experiment Videos

Further studies on angiotensin tachyphylaxis.

A Moore, P A Khairallah

    The Journal of Pharmacology and Experimental Therapeutics
    |June 1, 1976
    PubMed
    Summary

    Tachyphylaxis to angiotensin II analogs varies with temperature and pH. Lower temperatures and acidic pH accelerate tachyphylaxis, suggesting a link between receptor affinity and this phenomenon.

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    Area of Science:

    • Pharmacology
    • Physiology
    • Biochemistry

    Background:

    • Tachyphylaxis, a rapid decrease in drug response, is a critical factor in drug efficacy.
    • Angiotensin II (Ang II) plays a vital role in cardiovascular regulation.
    • Understanding Ang II tachyphylaxis mechanisms is crucial for therapeutic applications.

    Purpose of the Study:

    • To investigate the influence of temperature and pH on tachyphylaxis to Ang II and its analogs.
    • To explore the correlation between peptide analog receptor affinity and tachyphylaxis induction.
    • To elucidate the potential role of membrane-bound enzymes in tachyphylaxis.

    Main Methods:

    • Experiments were conducted on isolated rabbit aorta and rat fundus tissues.
    • Tachyphylaxis was assessed at different temperatures (37°C, 22°C, 30°C) and pH levels (7.4, 6.5).
    • Responses to Ang II, [Sar1]Ang II, and [des-Asp1]Ang II were measured.

    Main Results:

    • Rabbit aorta and rat fundus showed no tachyphylaxis to Ang II at 37°C but did to analogs.
    • Lower temperatures (22°C) induced rapid tachyphylaxis to Ang II in both tissues.
    • Acidic pH (6.5) at 37°C also led to rapid Ang II tachyphylaxis in rabbit aorta.
    • Rat uterus exhibited tachyphylaxis to Ang II analogs in a specific order of onset.
    • Tachyphylaxis was reversible upon prolonged incubation in peptide-free medium.

    Conclusions:

    • Tachyphylaxis to Ang II and its analogs is significantly influenced by temperature and pH.
    • A strong correlation exists between angiotensin receptor affinity and the induction of tachyphylaxis.
    • Membrane-bound enzymes may be involved in the development and persistence of tachyphylaxis.

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