Hydrogen sulfide and cell signaling: Team player or referee?

Hydrogen sulfide (H2S) has been postulated to be the third gasotransmitter, and along with other reactive compounds such as reactive oxygen species (ROS) and nitric oxide (NO) it is thought to be a key signalling molecule. Enzymes which generate H2S, and remove it, have been characterised in both pl...

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Bibliographic Details
Published in:Plant physiology and biochemistry 2014-05, Vol.78, p.37-42
Main Authors: Hancock, J.T., Whiteman, M.
Format: Article
Language:English
Subjects:
Animals
Biological and medical sciences
Fundamental and applied biological sciences. Psychology
Glutathione
Hydrogen peroxide
Hydrogen sulfide
Hydrogen Sulfide - metabolism
Models, Biological
Nitric oxide
Nitric Oxide - metabolism
Oxidation-Reduction
Plant physiology and development
Plants - metabolism
Reactive Oxygen Species - metabolism
Signal Transduction
Sulfhydryl Compounds - metabolism
Thiol modifications
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Summary:Hydrogen sulfide (H2S) has been postulated to be the third gasotransmitter, and along with other reactive compounds such as reactive oxygen species (ROS) and nitric oxide (NO) it is thought to be a key signalling molecule. Enzymes which generate H2S, and remove it, have been characterised in both plants and animals and although it is inherently toxic to cells – inhibiting cytochrome oxidase for example – H2S is now being thought of as part of signal transduction pathways. But is it working as a signal in the sense usually seen for small signalling molecules, that is, produced when needed, perceived and leading to dedicated responses in cells? A look through the literature shows that H2S is involved in many stress responses, and in animals is implicated in the onset of many diseases, in both cases where ROS and NO are often involved. It is suggested here that H2S is not acting as a true signal, but through its interaction with NO and ROS metabolism is modulating such activity, keeping it in check unless strictly needed, and that H2S is acting as a referee to ensure NO and ROS metabolism is working properly. •Summaries the current state-of-play of effects of hydrogen sulfide in plants.•Uses work on animals to suggest investigations in plants.•Suggests a new way to view the role of hydrogen sulfide in signaling.
ISSN:0981-9428
1873-2690
DOI:10.1016/j.plaphy.2014.02.012