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Cyclic Nucleotide-Signaling in Cells and Tissues: Molecular, Functional, and Pharmacological Aspects

A special issue of International Journal of Molecular Sciences (ISSN 1422-0067). This special issue belongs to the section "Biochemistry".

Deadline for manuscript submissions: 30 November 2025 | Viewed by 354

Special Issue Editor

Special Issue Information

Dear Colleagues,

Cellular and tissue signaling by cyclic nucleotides (cNMP, e.g., cAMP, and cGMP) is an expanding field that comprises molecular functions and (patho)physiology in various organ systems. Cyclic nucleotide synthesis, degradation, and function are modulated by a variety of signaling proteins and signal transduction pathways. Stuctural, biochemical, and (patho)physiological aspects have been greatly elucidated in the last decade in relation to cardiovascular, immunological, renal, pulmonary, gastrointestinal, and neuronal functions. The dysregulation of cyclic nucleotide generators (e.g., adenylyl/guanylyl cyclases), modulators (phosphodiesterases), and signaling molecules (e.g., kinases/substrates, channels) has been identified as the cause of pathophysiological processes and diseases. Pharmacological approaches have been utilized in pharmacological treatments for conditions including hypertension and cardiovascular and gastrointestinal diseases. Therefore, a molecular and functional understanding of diverse cyclic nucleotide generators, signaling proteins, scaffolds, and signal transduction pathways is fundamental in gaining an insight into their (patho)physiological processes. Futhermore, the non-canonical cyclic nucleotides (e.g., cCMP and cUMP) and the cyclic dinucleotides (e.g., cGAMP) are currently attracting interest. The aim for this Special Issue is to summarize and enhance the knowledge of these signaling processes and networks in diverse cells/tissues and to link it to (patho)physiological and pharmacological functions.

Therefore, authors are invited to submit original research and review articles that address the progress made and the current state of the art in cyclic nucleotide signaling.

Posible topics include, but are not limited to, the following:

  • Identification and new molecular and functional aspects of cyclic nucleotide signaling molecules and pathways;
  • Analysis of cyclic nucleotide signal generation, modulation, recognition, and/or transduction into (patho)physiological responses and/or pharmacologcal approaches;
  • Techniques for the analysis and identification of cyclic nucleotide signaling molecules, scaffolds, pathways, and networks.

Dr. Jens Schlossmann
Guest Editor

Manuscript Submission Information

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Keywords

  • cyclic nucleotide
  • cNMP, cAMP, cGMP, cCMP, cUMP, cGAMP
  • signaling proteins
  • signal transduction pathways
  • scaffolds
  • nitric oxide
  • natriuretic peptides
  • adenylyl cyclases, guanylyl cyclases
  • kinases
  • phosphodiesterases
  • channels
  • (patho)physiology
  • pharmacology

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Published Papers (1 paper)

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Research

8 pages, 2004 KiB  
Article
Updating the Mechanism of Bicarbonate (HCO3) Activation of Soluble Adenylyl Cyclase (sAC)
by Jacob Ferreira, Hayden Belliveau, Clemens Steegborn, Jochen Buck and Lonny R. Levin
Int. J. Mol. Sci. 2025, 26(13), 6401; https://doi.org/10.3390/ijms26136401 - 3 Jul 2025
Viewed by 162
Abstract
Soluble adenylyl cyclase (sAC) is molecularly and biochemically distinct from other mammalian nucleotidyl cyclases. It is uniquely regulated directly by bicarbonate (HCO3) and calcium (Ca2+) ions and is responsive to physiologic fluctuations in levels of its substrate, adenosine [...] Read more.
Soluble adenylyl cyclase (sAC) is molecularly and biochemically distinct from other mammalian nucleotidyl cyclases. It is uniquely regulated directly by bicarbonate (HCO3) and calcium (Ca2+) ions and is responsive to physiologic fluctuations in levels of its substrate, adenosine triphosphate (ATP). Our initial in vitro biochemical studies suggested two mechanisms for HCO3-dependent elevation of sAC activity: increasing catalytic rate and relieving inhibition observed in the presence of supraphysiological levels of substrate, ATP. Structural and mutational studies revealed that HCO3 increases catalytic rate via the disruption of a salt bridge that facilitates productive interactions with the substrate. Here, we demonstrate that the HCO3 stimulation observed under supraphysiological ATP concentrations is due to the mitigation of ATP-dependent acidification. Therefore, we conclude that the sole physiologically relevant mechanism of HCO3 regulation of sAC is through its pH-independent effect facilitating productive substrate binding to the catalytic site. Full article
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