(+)-Catechin attenuates activation of hepatic stellate cells

Natural Polyphenol-Mediated Inhibition of Ferroptosis Alleviates Oxidative Damage and Inflammation in Acute Liver Injury

Acetaminophen (APAP) overdose has long been recognized as the main cause of drug-induced liver injury (DILI), characterized by glutathione (GSH) depletion and reactive oxygen species (ROS) accumulation, leading to ferroptosis and inflammatory responses. There is an urgent need for liver-protective agents to combat ferroptosis, modulate oxidative stress, and ameliorate inflammation. Catechin, a well-known polyphenol compound, has been shown to have antioxidant potential. However, its protective role on APAP-induced liver injury (AILI) has not been elucidated. In this study, we evaluated the modulating effects of catechin on AILI and observed that catechin attenuated liver injury by reducing inflammation. Mechanistically, catechin alleviated hepatic oxidative stress by inhibiting ROS accumulation, malondialdehyde (MDA) production, and GSH depletion. Furthermore, catechin, as a hepatic injury reparative agent, could counteract APAP-induced hepatocyte ferroptosis by activating the xCT/GPX4 pathway, and is expected to be a novel natural inhibitor of ferroptosis. Additionally, the transcriptomic results indicated that the inhibition of Stat1 by catechin is important for the management of AILI. Inhibition of signal transducer and activator of transcription 1 (STAT1) expression, achieved through the use of the STAT1 inhibitor fludarabine in vivo and small interfering RNA (siRNA) in vitro, was confirmed to attenuate APAP-induced ferroptosis. In conclusion, the present study identified a novel natural drug inhibitor of ferroptosis and revealed its mechanism of action to inhibit ferroptosis, regulate oxidative stress, and ameliorate inflammation in AILI. This further provides new insights into the novel natural ferroptosis inhibitors for the treatment of ROS-related inflammatory diseases.

Potential of Natural Phenolic Compounds against Doxorubicin-Induced Chemobrain: Biological and Molecular Mechanisms Involved

Chemotherapy-induced cognitive impairment or "chemobrain" is a prevalent long-term complication of chemotherapy and one of the more devastating. Most of the studies performed so far to identify the cognitive dysfunctions induced by antineoplastic chemotherapies have been focused on treatment with anthracyclines, frequently administered to breast cancer patients, a population that, after treatment, shows a high possibility of long survival and, consequently, of chemobrain development. In the last few years, different possible strategies have been explored to prevent or reduce chemobrain induced by the anthracycline doxorubicin (DOX), known to promote oxidative stress and inflammation, which have been strongly implicated in the development of this brain dysfunction. Here, we have critically analyzed the results of the preclinical studies from the last few years that have evaluated the potential of phenolic compounds (PheCs), a large class of natural products able to exert powerful antioxidant and anti-inflammatory activities, in inhibiting DOX-induced chemobrain. Several PheCs belonging to different classes have been shown to be able to revert DOX-induced brain morphological damages and deficits associated with learning, memory, and exploratory behavior. We have analyzed the biological and molecular mechanisms implicated and suggested possible future perspectives in this research area.

(+)-Catechin inhibition of transmissible gastroenteritis coronavirus in swine testicular cells is involved its antioxidation

Transmissible gastroenteritis virus (TGEV) causes transmissible gastroenteritis (TGE), especially in newborn piglets, which severely threatens the worldwide pig industry. In this study, (+)-catechin was evaluated for its antiviral effect against TGEV in vitro. Viability assays revealed that (+)-catechin treatment exerted a dose-dependent rescue effect in TGEV-infected ST cells, and this result was only obtained with the post-treatment application of (+)-catechin. The viral yields in (+)-catechin-treated cultures were reduced by almost three log₁₀ units. Quantitative real-time PCR analysis of the TGEV genome revealed that TGEV RNA replication was restricted after (+)-catechin treatment. Intracellular reactive oxygen species (ROS) detection showed that (+)-catechin alleviated ROS conditions induced by TGEV infection. Our results showed that (+)-catechin exerts an inhibitory effect on TGEV proliferation in vitro and is involved its antioxidation.

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(+)-Catechin has anti-TGEV effect.

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Anti-TGEV effect was working after TGEV infection.

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(+)-Catechin could relieve CPE caused by TGEV in ST cells.

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TGEV proliferation was decreased after (+)-catechin incubation.

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Antioxidation of (+)-catechin is related to its antiviral effect.