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Related Experiment Video

Updated: Jun 1, 2026

Flash Photolysis of Caged Compounds in the Cilia of Olfactory Sensory Neurons
11:35

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Published on: October 29, 2011

Extremely low-frequency electromagnetic fields affect lipid-linked carbonic anhydrase.

Silvia Ravera1, Isidoro Mario Pepe, Daniela Calzia

  • 1Department of Biology, University of Genoa, Genova, Italy. silvia.ravera@gmail.com

Electromagnetic Biology and Medicine
|May 20, 2011
PubMed
Summary

Extremely low-frequency electromagnetic fields (ELF-EMF) reversibly inhibit bovine lung carbonic anhydrase (CA) activity by 17% at 75 Hz. This effect on membrane-bound CA IV depends on membrane interaction, not exposure duration.

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Area of Science:

  • Biophysics
  • Enzymology
  • Cell Biology

Background:

  • Extremely low-frequency electromagnetic fields (ELF-EMF) have been shown to affect enzyme activity.
  • Membrane-anchored enzymes are particularly susceptible to ELF-EMF, with some experiencing up to 50% activity reduction.
  • Carbonic anhydrases (CAs) are a family of metalloenzymes crucial for various physiological processes, with several isoforms being membrane-bound.

Purpose of the Study:

  • To investigate the effect of ELF-EMF on bovine lung membrane carbonic anhydrase (CA), specifically CA IV.
  • To determine the frequency, amplitude, and reversibility of ELF-EMF effects on CA activity.
  • To elucidate the role of the membrane and enzyme-membrane linkage in ELF-EMF-induced CA inactivation.

Main Methods:

  • Exposure of bovine lung membranes containing CA IV to a 75 Hz ELF-EMF at varying amplitudes.
  • Measurement of CA enzymatic activity before and after ELF-EMF exposure.
  • Solubilization of the enzyme using Triton X-100 to assess the role of the membrane.

Main Results:

  • A reproducible 17% decrease in CA activity was observed at 75 Hz, with a threshold of approximately 0.74 mT.
  • The observed decrease in enzymatic activity was independent of exposure time and completely reversible.
  • ELF-EMF lost its inhibitory effect when the enzyme was solubilized, highlighting the importance of the membrane and its linkage to the enzyme.

Conclusions:

  • Bovine lung membrane carbonic anhydrase IV activity is inhibited by ELF-EMF in a manner dependent on its membrane association.
  • The findings suggest that the physical state of the membrane and the glycosyl phosphatidyl inositol (GPI) linkage are critical for ELF-EMF-induced inactivation.
  • Further research is warranted to understand the physiological implications of CA inhibition by ELF-EMF in target organs.