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Drug Development and Natural Products Chemistry: A Themed Issue in Honor of Professor Søren Brøgger Christensen

A special issue of Molecules (ISSN 1420-3049). This special issue belongs to the section "Natural Products Chemistry".

Deadline for manuscript submissions: closed (30 September 2021) | Viewed by 8436

Special Issue Editors


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Guest Editor
Department of Biotechnology and Biomedicine, Technical University of Denmark, Kongens Lyngby, Denmark
Interests: terpenoids; plant biotechnology; plant biochemistry
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Guest Editor
Department of Drug Design and Pharmacology, University of Copenhagen, Universitetsparken 2, 2100 Copenhagen, Denmark
Interests: antimicrobial peptides; immunomodulation; drug delivery
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Guest Editor
Chemical Therapeutic Program, The Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins, Baltimore, MD, USA
Interests: drug development; solid malignancies; prodrugs

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Guest Editor
Department of Tumor Biology, Institute for Cancer Research, Oslo University Hospital, 0424 Oslo, Norway
Interests: tumor biology; autophagy; prostate cancer therapy
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Special Issue Information

Dear Colleagues,

Until the end of the 19th century, all drugs were natural products. During the 19th century, chemists succeeded in isolating pure natural products such as quinine, morphine, codeine, and other compounds with beneficial effects. Pure compounds enabled them to accurate dosing to achieve serum levels within the pharmacological window. At the end of the 19th century and during the 20th century, synthetic compounds became the major source of drugs. However, even today, natural products or modified natural products constitute almost half of the drugs used for treatment of diseases such as cancer or diseases caused by parasites such as malaria, leishmaniasis or schistomiasis. During his career, Søren Brøgger Christensen has focused on isolating natural products targeting biomacromolecules. Promising preclinical effects encouraged structure optimization with the goal of developing a drug. The compound Mipsagargin was brought into clinical phase II trials. The present Special Issue of Molecules will focus on the development of drugs from plant to patient. The manuscripts in the issue will reveal the isolation and structural elucidation of natural products, biological investigation of natural products revealing their possibilities for finding hit compounds, targeting compounds toward malignant tissue, and sustainable production of compounds in large scale.

Motivation for this issue of Molecules:

Søren Brøgger Christensen is a Professor Emeritus at the Department of Drug Design and Pharmacology, University of Copenhagen, Denmark. He is internationally recognized for his work in the isolation and identification of natural products with significant biological activities. He was involved in the discovery of the antiparasitic effects of licochalcone A and is the co-inventor on several patents in Lica Pharmaceuticals’ intellectual property portfolio. He was the first to elucidate the structure of the cytotoxin thapsigargin. Through intensive studies of the chemistry of this toxin, he was able to develop methods for partial synthesis of the compound ensuring sustainable supply. A number of prodrugs including mipsagargin have been prepared. Mipsagargin has been in clinical trials for glioblastoma and hepatocellular carcinoma. In addition, rational structure activity studies have been performed enabling preparation of a derivative, which potently provokes apoptosis without inducing a rise of the level of calcium ions in the cytosol. This observation strongly suggests that apoptosis induced by inhibitors SERCA is rather caused by emptying the endoplasmic reticulum than by increasing the cytosolic calcium ion concentration. Dr. Christensen has co-authored about 180 peer reviewed scientific publications and is co-inventor on a number of patents. H-index 52.

In honor of Professor Christensen’s outstanding contributions to the development of drugs from plant to patient, this Special Issue of Molecules is devoted to the many aspects of natural products, including their chemistry, pharmacological properties, structural characteristics, structure–function relationship, molecular engineering/drug design, effects and regulation of cellular pathways and gene expression in non-malignant and malignant cells, and therapeutic value. All scientists and clinicians working in these emerging and promising fields of research are strongly encouraged to submit their original works for publication in this Special Issue.

Prof. Dr. Henrik Toft Simonsen
Prof. Dr. Henrik Franzyk
Prof. Dr. John Isaacs
Dr. Nikolai Engedal
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Molecules is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2700 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • Natural products
  • Drug development
  • Biomacromolecules
  • Structure–activity relationships
  • Bioassays
  • Regulation of cellular pathways and gene expression
  • Preclinical testing
  • Sustainable supply

Published Papers (3 papers)

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Research

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16 pages, 1436 KiB  
Article
Barbeya oleoides Leaves Extracts: In Vitro Carbohydrate Digestive Enzymes Inhibition and Phytochemical Characterization
by Alaa A. Khojah, Guillermo F. Padilla-González, Ammar Bader, Monique J. S. Simmonds, Michael Munday and Michael Heinrich
Molecules 2021, 26(20), 6229; https://doi.org/10.3390/molecules26206229 - 15 Oct 2021
Cited by 4 | Viewed by 1808
Abstract
This study investigated the in vitro inhibitory potential of different solvent extracts of leaves of Barbeya oleoides on key enzymes related to type 2 diabetes mellitus (α-glucosidase and α-amylase) in combination with an aggregation assay (using 0.01% Triton X-100 detergent) to assess the [...] Read more.
This study investigated the in vitro inhibitory potential of different solvent extracts of leaves of Barbeya oleoides on key enzymes related to type 2 diabetes mellitus (α-glucosidase and α-amylase) in combination with an aggregation assay (using 0.01% Triton X-100 detergent) to assess the specificity of action. The methanol extract was the most active in inhibiting α-glucosidase and α-amylase, with IC50 values of 6.67 ± 0.30 and 25.62 ± 4.12 µg/mL, respectively. However, these activities were significantly attenuated in the presence of 0.01% Triton X-100. The chemical analysis of the methanol extract was conducted utilizing a dereplication approach combing LC-ESI-MS/MS and database searching. The chemical analysis detected 27 major peaks in the negative ion mode, and 24 phenolic compounds, predominantly tannins and flavonol glycosides derivatives, were tentatively identified. Our data indicate that the enzyme inhibitory activity was probably due to aggregation-based inhibition, perhaps linked to polyphenols. Full article
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13 pages, 3076 KiB  
Article
Interaction of (+)-Strebloside and Its Derivatives with Na+/K+-ATPase and Other Targets
by Yulin Ren, Sijin Wu, Sijie Chen, Joanna E. Burdette, Xiaolin Cheng and A. Douglas Kinghorn
Molecules 2021, 26(18), 5675; https://doi.org/10.3390/molecules26185675 - 18 Sep 2021
Cited by 6 | Viewed by 1750
Abstract
Docking profiles for (+)-strebloside, a cytotoxic cardiac glycoside identified from Streblus asper, and some of its derivatives and Na+/K+-ATPase have been investigated. In addition, binding between (+)-strebloside and its aglycone, strophanthidin, and several of their other molecular targets, [...] Read more.
Docking profiles for (+)-strebloside, a cytotoxic cardiac glycoside identified from Streblus asper, and some of its derivatives and Na+/K+-ATPase have been investigated. In addition, binding between (+)-strebloside and its aglycone, strophanthidin, and several of their other molecular targets, including FIH-1, HDAC, KEAP1 and MDM2 (negative regulators of Nrf2 and p53, respectively), NF-κB, and PI3K and Akt1, have been inspected and compared with those for digoxin and its aglycone, digoxigenin. The results showed that (+)-strebloside, digoxin, and their aglycones bind to KEAP1 and MDM2, while (+)-strebloside, strophanthidin, and digoxigenin dock to the active pocket of PI3K, and (+)-strebloside and digoxin interact with FIH-1. Thus, these cardiac glycosides could directly target HIF-1, Nrf2, and p53 protein–protein interactions, Na+/K+-ATPase, and PI3K to mediate their antitumor activity. Overall, (+)-strebloside seems more promising than digoxin for the development of potential anticancer agents. Full article
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Review

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24 pages, 34477 KiB  
Review
Mipsagargin: The Beginning—Not the End—of Thapsigargin Prodrug-Based Cancer Therapeutics
by John T. Isaacs, William Nathaniel Brennen, Søren Brøgger Christensen and Samuel R. Denmeade
Molecules 2021, 26(24), 7469; https://doi.org/10.3390/molecules26247469 - 09 Dec 2021
Cited by 11 | Viewed by 4040
Abstract
Søren Brøgger Christensen isolated and characterized the cell-penetrant sesquiterpene lactone Thapsigargin (TG) from the fruit Thapsia garganica. In the late 1980s/early 1990s, TG was supplied to multiple independent and collaborative groups. Using this TG, studies documented with a large variety of mammalian cell [...] Read more.
Søren Brøgger Christensen isolated and characterized the cell-penetrant sesquiterpene lactone Thapsigargin (TG) from the fruit Thapsia garganica. In the late 1980s/early 1990s, TG was supplied to multiple independent and collaborative groups. Using this TG, studies documented with a large variety of mammalian cell types that TG rapidly (i.e., within seconds to a minute) penetrates cells, resulting in an essentially irreversible binding and inhibiting (IC50~10 nM) of SERCA 2b calcium uptake pumps. If exposure to 50–100 nM TG is sustained for >24–48 h, prostate cancer cells undergo apoptotic death. TG-induced death requires changes in the cytoplasmic Ca2+, initiating a calmodulin/calcineurin/calpain-dependent signaling cascade that involves BAD-dependent opening of the mitochondrial permeability transition pore (MPTP); this releases cytochrome C into the cytoplasm, activating caspases and nucleases. Chemically unmodified TG has no therapeutic index and is poorly water soluble. A TG analog, in which the 8-acyl groups is replaced with the 12-aminododecanoyl group, afforded 12-ADT, retaining an EC50 for killing of <100 nM. Conjugation of 12-ADT to a series of 5–8 amino acid peptides was engineered so that they are efficiently hydrolyzed by only one of a series of proteases [e.g., KLK3 (also known as Prostate Specific Antigen); KLK2 (also known as hK2); Fibroblast Activation Protein Protease (FAP); or Folh1 (also known as Prostate Specific Membrane Antigen)]. The obtained conjugates have increased water solubility for systemic delivery in the blood and prevent cell penetrance and, thus, killing until the TG-prodrug is hydrolyzed by the targeting protease in the vicinity of the cancer cells. We summarize the preclinical validation of each of these TG-prodrugs with special attention to the PSMA TG-prodrug, Mipsagargin, which is in phase II clinical testing. Full article
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