Investigations on the anti-ulcerogenic activity of Sideritis caesarea H. Duman, Aytaç & Başer

Rosuvastatin repurposing for prophylaxis against ethanol-induced acute gastric ulceration in rats: a biochemical, histological, and ultrastructural perspective

Ethanol (EtOH) consumption is frequently associated with acute and chronic gastrointestinal disorders. Rosuvastatin (RSV), a third-generation statin, has demonstrated certain biological functions beyond its lipid-lowering properties. This study is designed to explore the gastroprotective impact of RSV in a rat model of EtOH-induced gastric ulceration in a dose-dependent manner through the evaluation of oxidant/antioxidant biomarkers, inflammatory myeloperoxidase (MPO) enzyme activity, and prostaglandin E2 (PGE2) levels in gastric tissues, along with histopathological examination of the gastric tissues. Therefore, 40 adult male rats were randomly divided into five equal groups as control, EtOH (gastric ulcer), RSV-low dose plus EtOH and RSV-high dose plus EtOH. The EtOH rat model of gastric ulceration was achieved by intragastric administration of a single dose of EtOH. Seven days before EtOH administration, rats were orally administered either omeprazole (20 mg/kg/day) or RSV (10 mg/kg/day or 20 mg/kg/day). RSV administration enhanced the antioxidant glutathione reduced, countered oxidative malondialdehyde, augmented cytoprotective PGE2, suppressed inflammatory MPO enzyme activity in gastric tissues, decreased ulcer index scoring, increased the percentage of ulcer inhibition, and reversed the associated histological and ultrastructural abnormalities, additionally, RSV treatment resulted in weak positive nuclear staining for the inflammatory nuclear factor kappa B in a dose-dependent manner. It is concluded that RSV demonstrates gastroprotective potential, attributable at least in part, to its antioxidant and anti-inflammatory properties, as well as its ability to promote ulcer protection through the maintenance of mucosal content and PGE2 levels. Thus, RSV therapy emerges as a safe option for patients with gastric ulcers.

α-Mangostin suppresses ethanol-induced gastric ulceration by regulating the Nrf2/HO-1 and NF-κB/NLRP3/caspase-1 signaling pathways and gut microbiota

α-Mangostin is a natural xanthone derivative isolated from Camellia atrophy (CA), commonly known as Lichuan black tea (LBT). The present study investigated the ameliorating effect and mechanism of α-mangostin on alcoholic gastric ulcers (GU) in rats. In vivo, α-mangostin relieved pathological symptoms. Moreover, α-mangostin regulated the activation of the nuclear factor (erythroid-derived 2)-like 2 (Nrf2)/heme oxygenase 1 (HO-1) and nuclear factor κB (NF-κB)/NLR family pyrin domain containing 3 (NLRP3)/caspase-1 pathways. Reactive oxygen species (ROS), tumor necrosis factor-α (TNF-α), and interleukin-1β (IL-1β) were significantly decreased and IL-10 were increased, the microtubule-associated protein light chain 3 (LC3)-II/LC3-I ratio was increased, p62 protein expression was decreased, and inducible nitric oxide synthase (iNOS) and cyclooxygenase 2 (COX-2) protein expression was down-regulated. The relevant mechanisms were validated using GSE-1 and RAW264.7 cells in an in vitro model. Furthermore, α-mangostin increased Ligilactobacillus and Muribaculum abundance as well as propionic acid and butyric acid contents. Therefore, α-mangostin possesses antioxidant and anti-inflammatory properties, and remodels intestinal flora dysbiosis through mechanisms that may involve regulation of the Nrf2/HO-1 pathway and NF-κB/NLRP3/caspase-1 pathway. It also increases propionic acid and butyric acid contents. This study provides novel evidence regarding the use of α-mangostin for treating GU.

Chemical profile of the Anatolian Sideritis species with bioactivity studies

CONTEXT

The genus Sideritis L. (Lamiaceae) is represented by 46 species in Turkey with an 79% endemism ratio, 42 of 46 belonging to the section Empodoclia.

OBJECTIVE

In this review article, Sideritis species growing in Turkey have been evaluated for phytochemical constituents and biological activities.

METHODS

The data for the isolates, components and extracts of the Anatolian Sideritis species and their bioactivity studies were retrieved from the main databases WoS, Scopus and PubMed from 1975 until 31 December 2022.

RESULTS

In this review article, terpenoids, flavonoids, phenolics and other secondary metabolites isolated from Turkish Sideritis species were reported. Anatolian Sideritis species, which primarily consist of monoterpenes and sesquiterpenes, were studied in detail. Sideritis plants are represented by 46 species in Turkey, and 25 of them were investigated for their diterpenoids through isolation or LC-MS studies. Most of the diterpenoids of Turkish Sideritis species have ent-kaurene skeleton, among them linearol, siderol, 7-epicandicandiol and sideridiol were found to be the main compounds. Exceptionally, labdane, pimarane and beyerene diterpenoids were only found in a few species. For phenolics and flavonoids, only 12 species were investigated until now, and they were found to be rich in phenylethanoid glycosides and flavonoid glycosides. In terms of activity, most of the species were tested for antioxidant activity, followed by antimicrobial and anti-ulcer/anti-inflammatory activities. Their cytotoxic, enzyme inhibitory, antinociceptive and antistress activities were less frequently studied.

CONCLUSIONS

Sideritis species should be considered promising therapeutic agents in the treatment of upper respiratory tract and ulcer/inflammatory diseases.