Advances in the Mechanism of Action and the Therapeutic Role of Phytopharmaceuticals

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

Deadline for manuscript submissions: 28 February 2026 | Viewed by 291

Special Issue Editors


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Guest Editor
Faculty of Pharmacy and Chemistry, University of Regensburg, Regensburg, Germany
Interests: biotransformation; medicinal plants; phytochemistry; biological activity; specialized metabolites

E-Mail Website
Guest Editor
Faculty of Pharmacy and Chemistry, University of Regensburg, Regensburg, Germany
Interests: pharmaceutical biology; natural product chemistry; medicinal plants; metabolism

Special Issue Information

Dear Colleagues,

There is evidence supporting the therapeutic use of plants since prehistoric times. Today, herbal medicines play a pivotal role in preventing and treating diseases associated with modern civilization, while natural products remain a rich source of lead structures for drug development.

Through evolutionary processes, plants have developed sophisticated chemical defense mechanisms, producing diverse specialized bioactive compounds such as terpenoids, flavonoids, and alkaloids. These compounds are critical for plants' ecological fitness and survival, but they also exhibit significant pharmacological properties in humans. Understanding the mechanisms of action of these bioactive metabolites fosters innovation in drug discovery and provides deeper insights into the therapeutic potential of plant-derived compounds in addressing complex diseases, including cancer, neurodegenerative disorders, and metabolic syndromes.

In recent years, biotransformation studies have emerged, focusing on the structural modification of phytochemicals by biological systems, including interactions with the microbiome in various niches of the human body. These studies have provided new perspectives on the therapeutic roles of medicinal plants.

This Special Issue invites original research and review articles that explore these dimensions of phytochemicals and medicinal plants. Topics of interest include investigations of bioactive specialized metabolites, their molecular targets, biotransformation pathways, interactions with the microbiome, and innovative therapeutic applications. This issue aims to provide a comprehensive overview of the state-of-the-art in this field, highlight the latest discoveries, and elucidate future research directions.

Dr. Maria-Eleni Grafakou
Prof. Dr. Jörg Heilmann
Guest Editors

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Keywords

  • medicinal plants
  • natural products
  • phytochemistry
  • biological activities
  • mechanism of action
  • biotransformation
  • microbiome

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Published Papers (1 paper)

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13 pages, 1077 KiB  
Systematic Review
Hawthorn (Crataegus spp.) Clinically Significantly Reduces Blood Pressure in Hypertension: A Meta-Analysis of Randomized Placebo-Controlled Clinical Trials
by Zsóka Szikora, Rebeka Olga Mátyus, Bettina Vargáné Szabó, Dezső Csupor and Barbara Tóth
Pharmaceuticals 2025, 18(7), 1027; https://doi.org/10.3390/ph18071027 (registering DOI) - 10 Jul 2025
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Abstract
Background/Objectives: Hypertension affects over 1.3 billion people globally, and inadequate therapy is reported in 80% of cases. Patients increasingly turn to complementary therapies, including hawthorn (Crataegus spp.), a traditional remedy for cardiovascular diseases. Hawthorn has long been used in folk medicine [...] Read more.
Background/Objectives: Hypertension affects over 1.3 billion people globally, and inadequate therapy is reported in 80% of cases. Patients increasingly turn to complementary therapies, including hawthorn (Crataegus spp.), a traditional remedy for cardiovascular diseases. Hawthorn has long been used in folk medicine to lower blood pressure; however, its efficacy has not been fully established. This meta-analysis aimed to evaluate the antihypertensive effects and safety of hawthorn in randomized, placebo-controlled trials. Methods: A systematic review and meta-analysis were conducted, including six studies with a total of 428 participants. The trials focused on systolic (SBP) and diastolic blood pressure (DBP) changes over treatment periods of 10 weeks to 6 months. Literature searches were conducted in the Embase, PubMed, Cochrane, and Web of Science databases. Studies that met the predefined PICO criteria were included. Data analysis was performed using a random-effects model, and the risk of bias was assessed using the Cochrane Risk of Bias Tool. Results: Hawthorn statistically significantly decreased SBP (MD: −6.65 mmHg; 95% CI [−11.72; 1.59]) and non-significantly reduced DBP (MD: −7.19 mmHg; 95% CI [−15.17; 0.79]) after 2–6 months of treatment. Variations in dosage (250–1200 mg/day) and study protocols contributed to this heterogeneity. Conclusions: The effect of hawthorn on blood pressure is clinically significant. However, larger, well-designed trials are needed to establish optimal dosing, duration, and efficacy with greater reliability. Full article
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