New Endogenous Opioid Peptides and Peptidomimetics with Potential Biological Importance

A special issue of Pharmaceuticals (ISSN 1424-8247). This special issue belongs to the section "Biopharmaceuticals".

Deadline for manuscript submissions: 20 May 2024 | Viewed by 2718

Special Issue Editors


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Guest Editor
Department of Organic Chemistry, University of Chemical Technology and Metallurgy, 1756 Sofia, Bulgaria
Interests: amino acids; peptide chemistry; organic synthesis; organic phosphorus compounds; biological active substances; endogenous peptides; pharmaceutical and medicinal chemistry
Special Issues, Collections and Topics in MDPI journals

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Guest Editor
Department of Analytical Chemistry, University of Chemical Technology and Metallurgy, 1756 Sofia, Bulgaria
Interests: analytical chemistry; development of methods for detection and determination of biologically active compounds; pharmaceutical chemistry; metallopeptide chemistry; spectral and electro analyses

Special Issue Information

Dear Colleagues,

This Special Issue aims to cover the recent progress in the synthesis, isolation, characterization, and biological activity of new endogenous peptide derivatives and peptidomimetics. Endogenous opioid peptides function simultaneously as hormones and neuromodulators. They are peptide molecules that are produced in the central nervous system as well as in various glands of the body.

The numerous endogenous opioid peptides (enkephalins, endorphins, dynorphins, nociceptin, endomorphins, hemoglobin-derived opioid peptides, etc.) exert their effects through the activation of receptors belonging to four main types: μ, δ, к and ε. Opioidergic neurons and opioid receptors are largely distributed centrally and peripherally. Opioids have numerous pharmacological effects, and they are thought to be involved in the physiological control of various functions.

The synthesis, isolation, and research of this type of compound are current scientific topics directly related to the study and future development of new therapies used in medicine. The development of peptide drugs with low toxicity and the absence of side effects is a significant problem, the solution of which is a challenge for scientists worldwide.

A number of in vivo studies have indicated that some biologically active peptide compounds become more bacteriostatic and carcinostatic upon chelation. In metal–peptide interactions, cations form stable complexes through bonds with coordinating groups as side chains of amino acids. These compounds, among other things, exert a wide variety of antimicrobial activities through structural changes of peptides upon metal binding and redox chemistry. From a structural point of view, opiate peptides are a fruitful area for investigation since they possess a number of H-atom donors and acceptors, and thus render a wide variety of intermolecular bonding, as well as different modes for coordination to metal ions. It is envisaged that this Special Issue will publish original high-quality papers, short commentaries, and comprehensive reviews presenting results and insights related to new endogenous opioid peptides and peptidomimetics with potential biological importance, from synthesis and structure characterization to their application. The Issue may cover reports from disciplines ranging from chemistry to biology in the field of opioid peptides and peptidomimetics containing a variety of amino acids in their molecules. Studies related to both the chelating ability of peptide molecules and their screening for aggregation in the presence of metal ions of biologically active endogenous peptide derivatives leading to the production of seeding factors in the formation of, for example, amyloid plaques, would also be of interest. Manuscripts presenting studies of the structural behavior of endogenous peptide molecules and their complex forms with metal ions in solution are also welcomed.

Prof. Dr. Petar Todorov
Dr. Stela Georgieva
Guest Editors

Manuscript Submission Information

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Keywords

  • endogenous peptides
  • opioid peptides
  • metallopeptides
  • peptidomimetics
  • neuropeptides
  • peptide–metal complexes
  • opioid receptors
  • chemical biology of endogenous peptides

Published Papers (2 papers)

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13 pages, 2784 KiB  
Article
Synthesis, In Silico Logp Study, and In Vivo Analgesic Activity of Analogs of Tetrapeptide FELL
by Boryana Borisova, Hristina Nocheva, Stéphane Gérard, Marie Laronze-Cochard, Stefan Dobrev, Silvia Angelova, Stoyko Petrin and Dancho Danalev
Pharmaceuticals 2023, 16(8), 1183; https://doi.org/10.3390/ph16081183 - 21 Aug 2023
Cited by 1 | Viewed by 867
Abstract
Background: The inflammatory process represents a specific response of the organism’s immune system. More often, it is related to the rising pain in the affected area. Independently of its origin, pain represents a complex and multidimensional acute or chronic subjective unpleasant perception. Currently, [...] Read more.
Background: The inflammatory process represents a specific response of the organism’s immune system. More often, it is related to the rising pain in the affected area. Independently of its origin, pain represents a complex and multidimensional acute or chronic subjective unpleasant perception. Currently, medical doctors prescribe various analgesics for pain treatment, but unfortunately, many of them have adverse effects or are not strong enough to suppress the pain. Thus, the search for new pain-relieving medical drugs continues. Methods: New tetrapeptide analogs of FELL with a generaanalgesic-Glu-X3-X4-Z, where X = Nle, Ile, or Val and Z = NH2 or COOH, containing different hydrophobic amino acids at positions 3 and 4, were synthesized by means of standard solid-phase peptide synthesis using the Fmoc/OtBu strategy in order to study the influence of structure and hydrophobicity on the analgesic activity. The purity of all compounds was monitored by HPLC, and their structures were proven by ESI-MS. Logp values (partition coefficient in octanol/water) for FELL analogs were calculated. Analgesic activity was examined by the Paw-pressure test (Randall-Selitto test). Results: The obtained results reveal that Leu is the best choice as a hydrophobic amino acid in the FELL structure. Conclusions: The best analgesic activity is found in the parent compound FELL and its C-terminal amide analog. Full article
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Review

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21 pages, 2750 KiB  
Review
Novel Opioids in the Setting of Acute Postoperative Pain: A Narrative Review
by Ashley Wang, Jasper Murphy, Lana Shteynman, Neil Daksla, Abhishek Gupta and Sergio Bergese
Pharmaceuticals 2024, 17(1), 29; https://doi.org/10.3390/ph17010029 - 25 Dec 2023
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Abstract
Although traditional opioids such as morphine and oxycodone are commonly used in the management of acute postoperative pain, novel opioids may play a role as alternatives that provide potent pain relief while minimizing adverse effects. In this review, we discuss the mechanisms of [...] Read more.
Although traditional opioids such as morphine and oxycodone are commonly used in the management of acute postoperative pain, novel opioids may play a role as alternatives that provide potent pain relief while minimizing adverse effects. In this review, we discuss the mechanisms of action, findings from preclinical studies and clinical trials, and potential advantages of several novel opioids. The more established include oliceridine (biased ligand activity to activate analgesia and downregulate opioid-related adverse events), tapentadol (mu-opioid agonist and norepinephrine reuptake inhibitor), and cebranopadol (mu-opioid agonist with nociceptin opioid peptide activity)—all of which have demonstrated success in the clinical setting when compared to traditional opioids. On the other hand, dinalbuphine sebacate (DNS; semi-synthetic mu partial antagonist and kappa agonist), dual enkephalinase inhibitors (STR-324, PL37, and PL265), and endomorphin-1 analog (CYT-1010) have shown good efficacy in preclinical studies with future plans for clinical trials. Rather than relying solely on mu-opioid receptor agonism to relieve pain and risk opioid-related adverse events (ORAEs), novel opioids make use of alternative mechanisms of action to treat pain while maintaining a safer side-effect profile, such as lower incidence of nausea, vomiting, sedation, and respiratory depression as well as reduced abuse potential. Full article
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