Mechanism of cryptotanshinone to improve endocrine and metabolic functions in the endometrium of PCOS rats

Enhancement of endometrial receptivity by Bushen Zhuyun Decoction via cryptotanshinone-mediated TRIM28 induction and HIF-1α suppression

ETHNOPHARMACOLOGICAL RELEVANCE

Bushen Zhuyun Decoction (BSZYD), a traditional Chinese remedy, has demonstrated clinical efficacy in the treatment of luteal phase deficiency (LPD), though its mechanistic pathways remain largely undefined.

AIM OF THE STUDY

This study aims to elucidate the mechanism by which BSZYD enhances endometrial receptivity.

MATERIALS AND METHODS

In an LPD rat model induced by RU-486 and treated with BSZYD, molecular markers of endometrial receptivity were evaluated using scanning electron microscopy (SEM). Furthermore, these markers were analyzed in the RL95-2 human adenocarcinoma cell line following knockdown of Tripartite motif containing 28 (TRIM28). Network pharmacology and UPLC-MS/MS were utilized to identify bioactive components that modulate Hypoxia-inducible factor-1 (HIF-1) signaling, followed by validation through molecular docking. The interaction between HIF-1α and TRIM28 was assessed using co-immunoprecipitation (Co-IP) and confocal microscopy. The effect of cryptotanshinone on TRIM28 expression was also examined in RL95-2 cells.

RESULTS

BSZYD significantly increased the number of embryo implantation sites and reduced endometrial reactive oxygen species (ROS) levels in LPD rats. TRIM28 was found to be crucial for BSZYD's enhancement of endometrial receptivity. Cryptotanshinone, a key component of BSZYD, downregulated HIF-1α expression in RL95-2 cells. The interaction between HIF-1α and TRIM28 was confirmed both in vivo and in vitro. In vitro, cryptotanshinone mitigated H2O2-induced oxidative stress. Furthermore, HIF-1α agonist administration attenuated BSZYD's ability to induce TRIM28 expression.

CONCLUSIONS

BSZYD and its bioactive constituent, cryptotanshinone, promote endometrial receptivity by inhibiting HIF-1α and upregulating TRIM28. These findings offer novel molecular targets and pharmacological insights for the prevention and treatment of LPD.

P2Y12 receptor-independent antiplatelet mechanism of cryptotanshinone: Network pharmacology and experimental validation of multi-target signaling pathways

ETHNOPHARMACOLOGICAL RELEVANCE

Cryptotanshinone serves as the principal bioactive constituent of Salvia miltiorrhiza Bunge, possesses a wide range of pharmacological activities. Salvia miltiorrhiza Bunge, a long-standing therapeutic agent in traditional Chinese medicine (TCM) practice, is renowned for its efficacy in enhancing blood circulation and alleviating blood stasis and infarction, thereby treating cardiovascular and cerebrovascular diseases.

AIM OF THE STUDY

Platelet activation, when excessive or aberrant, poses a significant risk, catalyzing the onset of various thrombotic disorders. Thus, this investigation is meticulously designed to assess the antiplatelet pharmacological activity of cryptotanshinone, delving into its mechanisms of action that operate independently of the P2Y12 receptor.

MATERIALS AND METHODS

We employed a combination of isolated human platelet functional analysis, network pharmacology, molecular docking, and animal experiments to explore the P2Y12 receptor-independent antiplatelet targets and the biological mechanisms by which cryptotanshinone improves thrombosis.

RESULTS

Utilizing the ADP-hydrolyzing enzyme apyrase, we isolated the direct effects of cryptotanshinone on platelet function. The findings reveal that cryptotanshinone can effectively inhibit platelet activation in a manner that is independent of the P2Y12 receptor, all the while maintaining normal tail bleeding times in murine models and not exacerbating mesenteric thrombosis. These effects appear to be mediated through intricate signaling pathways, including PI3K-AKT, MAPK, and STAT3.

CONCLUSION

This study compellingly confirms the capacity of cryptotanshinone to suppress platelet function independently of the P2Y12 receptor, establishing a robust theoretical foundation for innovative strategies in thrombosis prevention.

Cryptotanshinone alleviates immunosuppression in endometriosis by targeting MDSCs through JAK2/STAT3 pathway

BACKGROUND

Endometriosis (EMS), a well-recognized chronic inflammatory disorder, characterized by significant immune dysregulation, in which myeloid-derived suppressor cells (MDSCs) are essential for facilitating immunosuppression and driving to disease progression. Cryptotanshinone (CTS) is an active compound capable of modulating MDSC-mediated immunosuppression; however, its therapeutic effects and mechanisms in the treatment of EMS remain unclear.

PURPOSE

This study aims to investigate the therapeutic potential of CTS in modulating MDSCs through JAK2/STAT3 signaling pathway and to evaluate its effects on immune microenvironment and endometriotic lesion growth in EMS.

METHODS

Transcriptomic data (GSE141549) and single-cell RNA sequencing data (GSE213216) were analyzed to compare immune cell populations in control endometrium (CE), eutopic endometrium (EuE) and ectopic endometrium (EcE) of patients with EMS. Network pharmacology analysis, surface plasmon resonance (SPR) and cellular thermal shift assay (CETSA) were utilized to explore the molecular mechanism of CTS's effects on MDSCs. A C57BL/6J EMS mice model was established to evaluate CTS's influence on MDSC-mediated immune response in vivo. Flow cytometry and immunofluorescence were used to analyze the immune cell populations, particularly MDSCs and CD8+ T cells. Ex vivo bone marrow (BM)-derived MDSCs were prepared to investigate the modulatory activities of CTS on the frequency and function of MDSCs. The impacts of CTS on JAK2/STAT3 pathway were further examined by western blot.

RESULTS

Bioinformatic analysis revealed that, among the three progression stages (CE, EuE, and EcE), the EcE stage exhibited a relatively elevated level of MDSCs and a reduced level of CD8+ T cells. Network pharmacological analysis, along with SPR and CETSA identified that CTS potentially modulates MDSCs in EMS by targeting the JAK2/STAT3 pathway. In vivo studies demonstrated that a relatively high dose of CTS treatment (60mg/kg) effectively inhibited lesion growth, reduced the population of MDSCs, and enhanced CD8+ T cell infiltration. Ex vivo experiments showed that CTS decreased the BM-derived MDSC frequency and rescued the suppressive ability of MDSC upon CD8+ T cells in a dose-dependent manner. Further mechanism analysis confirmed that CTS modulates the expression of immunosuppressive genes and proteins associated with MDSCs through JAK2/STAT3 pathway.

CONCLUSION

This study is the first to demonstrate that CTS is a promising natural compound for EMS treatment by inhibiting MDSC accumulation and modulating MDSC-mediated immune responses. Its therapeutic efficacy is linked to the modulation of the JAK2/STAT3 signaling pathway.

The effect of adipose-derived mesenchymal stem cell transplantation on ovarian mitochondrial dysfunction in letrozole-induced polycystic ovary syndrome in rats: the role of PI3K-AKT signaling pathway

OBJECTIVE

The present study aimed to elucidate how mesenchymal stem cells (MSCs) application could efficiently attenuate pathological changes of letrozole-induced poly cystic ovary syndrome (PCOS) by modulating mitochondrial dynamic via PI3K-AKT pathway.

METHODS

Thirty-two female rats were randomly divided into four experimental groups: Sham, PCOS, PCOS + MSCs, and PCOS + MSCs + LY294002. The Sham group received 0.5% w/v carboxymethyl cellulose (CMC); the PCOS group received letrozole (1 mg/kg, daily) in 0.5% CMC for 21 days. Animals in the PCOS + MSCs group received 1 × 106 MSCs/rat (i.p,) on the 22th day of the study. In the PCOS + MSCs + LY294002 group, rats received LY294002 (PI3K-AKT inhibitor) 40 min before MSC transplantation. Mitochondrial dynamic gene expression, mitochondrial membrane potential (MMP), citrate synthase (CS) activity, oxidative stress, inflammation, ovarian histological parameters, serum hormone levels, homeostatic model assessment for insulin resistance (HOMA-IR), insulin and glucose concentrations, p-PI3K and p-AKT protein levels were evaluated at the end of the experiment.

RESULTS

PCOS rats showed a significant disruption of mitochondrial dynamics and histological changes, lower MMP, CS, ovary super oxide dismutase (SOD) and estrogen level. They also had a notable rise in insulin and glucose concentrations, HOMA-IR, testosterone level, tumor necrosis factor-α (TNF-α) and interleukin-6 (IL-6) levels, ovarian malondialdehyde (MDA) content as well as a notable decrease in p-PI3K and p-AKT protein levels compared to the Sham group. In the PCOS + MSCs group, the transplantation of MSCs could improve the above parameters. Administration of LY294002 (PI3K-AKT pathway inhibitor) deteriorated mitochondrial dynamic markers, oxidative stress status, inflammation markers, hormonal levels, glucose, and insulin levels and follicular development compared to the PCOS + MSCs group.

CONCLUSIONS

This study demonstrated that the protective effects of MSC transplantation in regulating mitochondrial dynamics, promoting mitochondrial biogenesis, competing with redox status and inflammation response were mainly mediated through the PI3K-AKT pathway in the PCOS model.