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Related Experiment Videos

Lung epinephrine synthesis.

B Kennedy1, H Elayan, M G Ziegler

  • 1Department of Medicine, University of California Medical Center, San Diego 92103.

The American Journal of Physiology
|April 1, 1990
PubMed
Summary
This summary is machine-generated.

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Rat lungs synthesize epinephrine (E) independently of adrenal glands. Lung homogenates contain enzymes that N-methylate norepinephrine (NE) to form E, with activity distinct from adrenal or cardiac enzymes.

Area of Science:

  • Biochemistry
  • Pharmacology
  • Physiology

Background:

  • Epinephrine (E) is primarily synthesized in the adrenal medulla.
  • The presence and activity of E-synthesizing enzymes in lung tissue remain less understood.
  • Investigating non-adrenal E synthesis is crucial for understanding its broader physiological roles.

Purpose of the Study:

  • To investigate the in vitro and in vivo synthesis of epinephrine (E) in rat lungs.
  • To characterize the enzymatic activity responsible for E formation in lung homogenates.
  • To compare lung E-forming enzymes with those found in adrenal and cardiac tissues.

Main Methods:

  • Demedullation of rats to assess circulating and lung E levels.
  • In vitro incubation of lung homogenates with S-[3H]adenosylmethionine and norepinephrine (NE).

Related Experiment Videos

  • Enzyme activity assays comparing lung, adrenal, and cardiac tissues using specific inhibitors and substrates (NE, dopamine [DA]).

    • Main Results:

    • Following adrenal demedullation, lung E levels remained significant (30%), indicating independent synthesis.
    • Rat lung homogenates demonstrated N-methylation of NE to form E, with optimal activity at pH 8 and ~55°C.
    • Lung homogenates exhibited enzyme characteristics distinct from both adrenal phenylethanolamine N-methyltransferase (PNMT) and cardiac nonspecific N-methyltransferase (NMT).

    Conclusions:

    • Rat lungs possess intrinsic enzymatic machinery for epinephrine synthesis, independent of the adrenal medulla.
    • The lung's E-forming enzymes display unique kinetic and regulatory properties compared to adrenal and cardiac tissues.
    • These findings suggest a potential localized role for epinephrine produced within the lung.