1.Therapeutic Effect and Mechanism of Solanum nigrum on Hepatic Fibrosis Induced by Carbon Tetrachloride in Rats
Min WU ; Zhenxiang AN ; Yuanli HE ; Weinong WEN ; Qiang SU ; Song HE
Chinese Journal of Experimental Traditional Medical Formulae 2026;32(2):117-125
ObjectiveTo investigate the therapeutic effect and mechanism of Solanum nigrum on hepatic fibrosis induced by carbon tetrachloride (CCl4) in rats. MethodsSixty SD rats were randomly allocated into blank, model, low-, medium-, and high-dose (0.9, 1.8, 3.6 g·kg-1, respectively) S. nigrum, and silibinin capsules (18.9 mg·kg-1) groups. Except the blank group, the other groups were subjected to intraperitoneal injection of 40% CCl4 solution for the modeling of hepatic fibrosis. After 4 weeks of gavage, blood was collected from the abdominal aorta following intraperitoneal anesthesia. The rats were sacrificed, and the liver was separated. The pathological changes were observed by hematoxylin-eosin staining and Masson staining. The levels of alanine aminotransferase (ALT), aspartate aminotransferase (AST), and liver fibrosis indexes [type Ⅲ procollagen (PCⅢ), type Ⅳ collagen (Col Ⅳ), laminin (LN), and hyaluronic acid (HA)] in the rat serum were determined. The mRNA and protein levels of B cell lymphoma-2 (Bcl-2)/Bcl-2-associated X protein (Bax)/cysteinyl aspartate-specific proteinase-3 (Caspase-3) pathway-related factors were determined by Real-time fluorescence quantitative polymerase chain reaction (Real-time PCR) and Western blot, respectively. ResultsCompared with the blank group, the model group exhibited significant hepatocyte edema, infiltration of inflammatory cells, connective tissue proliferation, and collagen fiber deposition in the liver tissue. Compared with the model group, low-, medium-, and high-dose S. nigrum and silymarin capsules significantly improved the structure of liver cells and alleviated the edema, inflammatory cell infiltration, connective tissue proliferation, and collagen fiber deposition. Compared with those in the blank group, the serum levels of ALT, AST, PCⅢ, Col Ⅳ, LN, and HA were elevated in the model group (P<0.01). Compared with the model group, the serum levels of ALT, AST, PCⅢ, Col Ⅳ, LN, and HA were reduced in all the treatment groups (P<0.05). Real-time PCR and Western blot results showed that compared with the blank group, the model group had up-regulated mRNA and protein levels of Bcl-2 and down-regulated mRNA and protein levels of Bax and Caspase-3 (P<0.01). Compared with the model group, all the treatment groups showed down-regulated mRNA and protein levels of Bcl-2 and up-regulated mRNA and protein levels of Bax and Caspase-3 (P<0.05), with the high-dose S. nigrum group showing the best therapeutic effect. ConclusionS. nigrum modulates the progression of hepatic fibrosis in rats by regulating apoptosis through the Bcl-2/Bax/caspase-3 pathway.
2.Sanren Runchang Formula Regulates Brain-gut Axis to Treat IBS-C: A Randomized Controlled Trial
Teng LI ; Xinrong FAN ; He YAN ; Zhuozhi GONG ; Mengxi YAO ; Na YANG ; Yuhan WANG ; Huikai HU ; Wei WEI ; Tao LIU
Chinese Journal of Experimental Traditional Medical Formulae 2026;32(2):154-161
ObjectiveTo observe the clinical efficacy of Sanren Runchang formula in treating constipation-predominant irritable bowel syndrome (IBS-C) by regulating the brain-gut axis and the effects of the formula on serum levels of 5-hydroxytryptamine (5-HT), vasoactive intestinal peptide (VIP), and substance P (SP). MethodsA randomized controlled design was adopted, and 72 IBS-C patients meeting Rome Ⅳ criteria were randomized into observation and control groups (36 cases).The observation group received Sanren Runchang formula granules twice daily, and the control group received lactulose oral solution daily for 4 weeks. IBS Symptom Severity Scale (IBS-SSS), IBS Quality of Life Scale (IBS-QOL), and Bristol Stool Form Scale (BSFS) were used to assess clinical symptoms, and bowel movement frequency was recorded. The Self-Rating Anxiety Scale (SAS) and Self-Rating Depression Scale (SDS) were employed to evaluate psychological status. ELISA was employed to measure the serum levels of 5-HT, VIP, and SP. ResultsThe total response rate in the observation group was 91.67% (33/36), which was higher than that (77.78%, 28/36) in the control group (χ2=4.50, P<0.05). After treatment, both groups showed increased defecation frequency and BSFS scores, decreased IBS-SSS total score, abdominal pain and bloating scores, IBS-QOL health anxiety, anxiety, food avoidance, and behavioral disorders scores, SAS and SDS scores, serum 5-HT and VIP levels, and increased SP levels (P<0.05, P<0.01). Moreover, the observation group showed more significant changes in the indicators above than the control group (P<0.05, P<0.01). The SP level showed no significant difference between the two groups. During the 4-week follow-up, the recurrence rate was 5.88% in the observation group and 31.25% in the control group. No adverse events occurred in observation group, and 2 cases of mild diarrhea occurred in the control group. ConclusionSanren Runchang formula demonstrated definitive efficacy in alleviating gastrointestinal symptoms and improving the psychological status and quality of life in IBS-C patients, with a low recurrence rate. The formula can regulate serum levels of neurotransmitters such as 5-HT and VIP, suggesting its potential regulatory effect on the brain-gut axis through modulating neurotransmitters and neuropeptides. However, its complete mechanism of action requires further investigation through detection of additional brain-gut axis-related biomarkers.
3.Molecular Mechanism of Astragali Radix and Hedyotis diffusa in Regulating LINC01134-CTCF-p21 Axis to Inhibit Lung Adenocarcinoma Proliferation
Haipeng SUN ; He ZHUANG ; Xue LIU ; Siyuan LIU
Chinese Journal of Experimental Traditional Medical Formulae 2026;32(3):131-138
ObjectiveTo explore the interaction and competitive binding of Homo sapiens long intergenic non-protein-coding RNA 1134 (LINC01134) to CCCTC-binding factor CTCF, affecting the transcription of cyclin-dependent kinase inhibitor (p21) and influencing the proliferation of A549 cells, in order to investigate the possible mechanism of Astragali Radix and Hedyotis diffusa (A-H) in inhibiting A549 proliferation by regulating this axis. MethodsRNA-binding protein immunoprecipitation (RIP) assays were conducted to examine the interaction between LINC01134 and CTCF, and chromatin immunoprecipitation (ChIP) assays were used to study the effect of LINC01134 overexpression on the interaction between CTCF and p21. Stable A549 cell lines (oe-NC and oe-LINC01134) were established using lentiviral transfection, and each group was treated with 10% A-H drug-containing serum. Real-time PCR and Western blot analyses were performed to detect the effects of A-H on the expression of LINC01134, CTCF, and p21 in A549 cells. Cell counting kit-8 (CCK-8) and colony formation assays were used to assess the effects of A-H on A549 cell proliferation via LINC01134. Flow cytometry was employed to evaluate the effects of A-H on the A549 cell cycle through LINC01134, and Western blot was used to detect changes in cell cycle proteins. ResultsCompared with the IgG group, the oe-CTCF group showed a significantly increased abundance of LINC01134 aggregates (P0.01). Compared with the oe-Vector group, p21 abundance in CTCF complexes was significantly reduced in the oe-LINC01134 group (P0.01). Compared with the 10% blank + oe-LINC01134 group, the 10% A-H + oe-LINC01134 group reversed the expression of LINC01134 and p21 (P0.05), but had no significant regulatory effect on CTCF. Compared with the 10% blank + oe-LINC01134 group, the 10% A-H + oe-LINC01134 group reversed cell viability at 72 h (P0.05), inhibited malignant proliferation (P0.05), and reversed the proportions of cells in the G0/G1 and S phases (P0.01). Furthermore, compared with the 10% blank + oe-LINC01134 group, the 10% A-H + oe-LINC01134 group reversed the expression of Cyclin D1, CDK4, Cyclin E, CDK2, phosphorylated retinoblastoma protein (p-Rb), and E2F transcription factor 3 (E2F3) (P0.01). ConclusionA-H regulates the LINC01134-CTCF-p21 axis to block the G1/S phase transition of A549 cell cycle, accelerate cellular senescence, and inhibit malignant proliferation.
4.Phlorizin Ameliorates Glucose and Lipid Metabolism Disorders in T2DM Rats by Modulating IRS-1/PI3K/Akt Signaling Pathway
Nuer AILI ; Qingyu CAO ; Huan LIU ; Junwei HE ; Weihong ZHONG ; Lan CAO
Chinese Journal of Experimental Traditional Medical Formulae 2026;32(3):139-148
ObjectiveTo observe the pharmacodynamic efficacy of phlorizin in improving hepatic glycolipid metabolism disorders in type 2 diabetic mellitus (T2DM) rats and to explore its mechanism of action based on the insulin receptor substrate-1 (IRS-1)/phosphatidylinositol 3-kinase (PI3K)/protein kinase B (Akt) signaling pathway. MethodsA high-fat diet and streptozotocin (STZ) were used to establish T2DM rat models. The rats were randomly assigned into six groups: the blank control group, model group, metformin group (300 mg·kg-1), and phlorizin high-dose (100 mg·kg-1) and low-dose groups (25 mg·kg-1). The rats were given intragastric administration for 6 weeks. The changes in body weight and fasting blood glucose (FBG) were observed, and the oral glucose tolerance test (OGTT) was carried out. The levels of total cholesterol (TC), triglyceride (TG), low-density lipoprotein cholesterol (LDL-C), high-density lipoprotein cholesterol (HDL-C), glycated serum protein (GSP), aspartate aminotransferase (AST), and alanine aminotransferase (ALT) in serum were detected by an automatic biochemical analyzer. The levels of fasting insulin (FINS), interleukin (IL)-1β, IL-6, and tumour necrosis factor (TNF)-α were detected by enzyme-linked immunosorbent assay (ELISA). The levels of superoxide dismutase (SOD) and malondialdehyde (MDA) were detected by the biochemical assays. The pancreas index, liver index, and insulin resistance index were calculated. Hematoxylin-eosin (HE) staining was used to evaluate the pathological changes in liver and pancreatic tissues. The immunofluorescence method was used to detect the changes in insulin and glucagon in pancreatic tissue. Western blot was used to detect the expression of related proteins in the IRS-1/PI3K/Akt pathway of liver tissue and its downstream glycogen synthase kinase-3β (GSK-3β) and forkhead box transcription factor O1 (FoxO1) proteins. ResultsCompared with the blank control group, the body weight of rats in the model group continued to decrease, while the FBG level increased significantly. The area under the OGTT blood glucose curve (AUC), GSP, TC, TG, LDL-C, IL-1β, IL-6, TNF-α, MDA, pancreatic index and liver index increased significantly, while the levels of HDL-C, SOD, and FINS decreased significantly (P0.05, P0.01). Histological results showed that the pancreatic islets of rats in the model group exhibited atrophy and severe structural abnormalities. The insulin-positive β-cells decreased significantly (P0.01), while the glucagon-positive α-cells increased significantly (P0.01). Inflammatory cell infiltration and partial necrosis were observed in the liver tissues of the model group rats. The expressions of p-IRS-1/IRS-1, p-GSK-3β/GSK-3β, and p-FoxO1/FoxO1 proteins in the liver of the model group increased significantly (P0.01), while the expressions of p-PI3K/PI3K and p-Akt/Akt proteins decreased significantly (P0.01). Compared with the model group, the diabetic symptoms of rats in all administration groups were improved. The changes in body weight and FBG were close to those of the blank control group. The levels of OGTT-AUC, GSP, TC, TG, LDL-C, MDA, IL-1β, IL-6, TNF-α and the pancreatic index, liver index were obviously reduced (P0.05, P0.01), while the levels of HDL-C, SOD, and FINS obviously increased (P0.05, P0.01). The pathological changes of the pancreas and liver in rats in all treatment groups were effectively improved. The insulin-positive β-cells in the pancreas increased significantly (P0.01), while the glucagon-positive α-cells decreased significantly (P0.01). The protein expressions of p-IRS-1/IRS-1, p-GSK-3β/GSK-3β, and p-FoxO1/FoxO1 in the liver were significantly reduced (P0.01), while the protein expressions of p-PI3K/PI3K and p-Akt/Akt significantly increased (P0.01). ConclusionPhlorizin reversed the weight loss and abnormal increase of FBG in T2DM rats, improved blood lipid profiles, oxidative stress, and inflammatory levels, alleviated insulin resistance, and had certain protective effects on the liver and pancreas. The hypoglycemic mechanism may involve regulating the IRS-1/PI3K/Akt signaling pathway to inhibit the activities of GSK-3β and FoxO1, thereby promoting liver glycogen synthesis and suppressing hepatic gluconeogenesis, ultimately improving glycolipid metabolism disorders.
5.Clinical Efficacy of Qi-regulating and Phlegm-removing Method(Liu Junzitang Combined with Linggang Wuwei Jiangxintang) in Treating AECOPD with Increased EOS
Renjie HUANG ; Wangqin YU ; Wuyinuo TANG ; Hong SONG ; Lyuyuan HE ; Wenbo LIN ; Guanyi WU ; Hang HUANG
Chinese Journal of Experimental Traditional Medical Formulae 2026;32(3):149-156
ObjectiveTo assess the efficacy and safety of the Qi-regulating and phlegm-removing method(Liu Junzitang Combined with Linggang Wuwei Jiangxintang) for treating acute exacerbations of chronic obstructive pulmonary disease (AECOPD) with increased eosinophils (EOS). MethodsSixty-eight AECOPD patients with increased EOS who were hospitalized in the Department of Pulmonary Diseases of Jinhua Traditional Chinese Medicine Hospital from April 2023 to April 2024 were recruited and randomly assigned to an experimental group (EG) or a control group (CG). Both groups received conventional Western medicine, with the EG additionally receiving Liujunzitang and Linggan Wuwei Jiangxintang. The therapeutic efficacy indicators were measured after the treatment. The main therapeutic efficacy indicators included partial pressure of oxygen (PaO2) and partial pressure of carbon dioxide (PaCO2). The secondary efficacy indicators included the TCM symptom scores, the COPD Assessment Test (CAT) score, the Modified Medical Research Council (mMRC) Dyspnea Scale score, and the length of hospital stay. The indicators were measured at baseline and on days 3 and 7 of intervention. The safety was evaluated based on the adverse events. ResultsBaseline characteristics were not statistically different between the two groups. Compared with CG, EG showed no significant difference in PaO2 (P=0.773), PaCO2 (P=0.632) and or CAT score (P=0.336) at on day 3 but better PaO2 (P=0.004), PaCO2 (P=0.008), and CAT score (P=0.013) were significantly better at on day 7. Compared with CGAfter treatment, EG had lower TCM syndrome scores of than CG EG on day 3 (P=0.005) and day 7 were significantly decreased (P0.001). There was no significant difference in mMRC score between the two groups on day 3 (P=0.514) and day 7 (P=0.176) as wasor the length of hospital stay (P=0.915). The generalized linear mixed model (GLMM) showed that compared with CG, EG had significant improvements over time in PaO2, PaCO2, TCM syndrome symptom scores, CAT score, and mMRC score. ConclusionRegulating qi Qi and removing phlegm combined with conventional Western medicine can significantly alleviateimprove the clinical symptoms and improve the lung function of AECOPD patients with increased EOS increased AECOPDwhich has and demonstrates good safety.
6.Exploring Pathogenesis and Treatment Principles of Chronic Obstructive Pulmonary Disease Based on Spleen-mitochondria Correlation
Shiyi WANG ; Miao YU ; Xinyao HE ; Zi WANG ; Haijun LUAN ; Yibo SUN ; Haotong WANG ; Linlin WANG ; Lijian PANG
Chinese Journal of Experimental Traditional Medical Formulae 2026;32(3):258-264
According to the Qi-blood-body fluid theory and the association between the spleen in visceral manifestation theory of traditional Chinese medicine (TCM) and mitochondria in modern cellular biology, it is proposed that the role of the spleen in generating and transforming Qi and blood is analogous to the energy-producing function of mitochondria—both serving as fundamental power sources for vital activities of the human body. The spleen governs transportation and transformation, playing a critical role in energy metabolism and the digestion and absorption of nutrients. Similarly, mitochondria are vital for maintaining physiological functions such as cellular energy supply, cell survival, and overall human metabolism. Furthermore, spleen deficiency is closely linked to mitochondrial dysfunction. Accordingly, mitochondrial energy conversion and substance metabolism are regarded as the microscopic essence of the spleen's function in transportation and transformation. Spleen deficiency and mitochondrial dysfunction contribute to the formation of pathological products such as phlegm-turbidity and blood stasis. This aligns with the pathogenesis of chronic obstructive pulmonary disease (COPD), with Qi deficiency as the root cause and phlegm-turbidity and blood stasis as the manifestations. Therefore, the integrative treatment of COPD should follow the therapeutic principle of invigorating the spleen and reinforcing healthy Qi, while also resolving phlegm and removing blood stasis to address both root cause and manifestations. This approach can improve the mitochondrial function, regulate energy metabolism, and reduce oxidative stress levels to alleviate COPD symptoms, slow down disease progression, and improve prognosis. By integrating the holistic concept of TCM with molecular mechanisms of modern medicine, this paper explores the pathogenesis and therapeutic principles of COPD from the spleen-mitochondria correlation. It not only provides a new direction for the modern development of TCM and the integration of Chinese and Western medicine but also offers a theoretical foundation for the integrated treatment of chronic, complex age-related diseases.
7.Interpretation of Middle-regulating Formulas Based on Fuxing Jue
Junqiao AN ; Yixin MA ; Dongmei LI ; Qingyong HE
Chinese Journal of Experimental Traditional Medical Formulae 2026;32(3):265-272
The Dunhuang manuscript Fuxing Jue takes the "Tangye Jingfa Tu" as the core of its theory on prescription and compatibility. Its medication principles mainly include the "five elements principle of tonifying and purging" and the "five elements principle of elimination and transformation". Based on the differentiation of deficiency and excess in the five Zang organs, it flexibly applies medicinal properties, usage, and flavor transformation for tonifying and purging, forming its unique method of medication and compatibility. In Taiyin disease, "fullness syndrome" often occurs together with "diarrhea", and these two conditions also serve as the primary indications for the middle-regulating formulas. Among them, Lizhong Wan (Tang) mainly address Taiyin deficiency. The three Xiexin Tang (Banxia Xiexin Tang, Gancao Xiexin Tang, Shengjiang Xiexin Tang) address Taiyin deficiency accompanied by pathogenic excess. The Sini Tangand Tongmai Sini Tang primarily treat dysfunction of the liver, spleen, and kidney with impaired opening and closing of Taiyin, manifesting as diarrhea. The medicinal flavors of middle-regulating formulas are pungent, sweet, and bitter, acting directly on the spleen of Taiyin. The pungent flavor induces purging of the spleen, sweet flavor tonifies the spleen, and bitter flavor eliminates lumps. When the constituent medicinal units of middle-regulating formulas are unified, the ratio of pungent to sweet flavors reflects the tonic and purgative strength of the formula. In addition, the two decoction methods, "short-term decoction to extract Qi" and "long-term decoction to extract flavor", also influence the formula's tonifying and purgative effects. Based on the composition of flavors and special decoction methods, this article discusses the differences in the use of middle-regulating formulas for treating "“fullness syndrome" versus "diarrhea". Dysfunction of the spleen can give rise to various diseases. Therefore, middle-regulating formulas are not limited to treating "deficiency, cold, and dampness" syndromes. Later generations of physicians further modified Lizhong Tang to treat "excess, heat, and dryness" syndromes, laying a solid foundation for more flexible and effective clinical application of middle-regulating formulas.
8.Cell Autophagy of Digestive System Tumors Induced by Active Ingredients in Traditional Chinese Medicine: A Review
Wenjun LI ; Chengzhi WANG ; Zhenyao YANG ; Mingyang HE ; Gelei ZHAO ; Dongdong LI ; Peimin LIU
Chinese Journal of Experimental Traditional Medical Formulae 2026;32(3):314-320
As one of the most common malignant tumors, digestive system tumors exhibit an increase in the incidence and mortality year by year. Its pathogenesis is complex, making it difficult to carry out early prevention. Autophagy is a process in which cells use lysosomes to degrade their organelles and macromolecules to maintain cellular homeostasis under the regulation of autophagy-related genes. Cellular autophagy has a dual regulatory effect on the tumor microenvironment, which always affects the occurrence and development of digestive system tumors. Therefore, the effect and mechanism of action of cellular autophagy on digestive system tumors have become a hot topic in tumor therapy in recent years. Meanwhile, the remarkable research results of targeted autophagy drugs indicate that cellular autophagy may become an important target for anti-digestive system tumors. Traditional Chinese medicine (TCM) has been widely used in the comprehensive treatment of digestive system tumors with good efficacy. A variety of active ingredients in TCM, such as flavonoids, glycosides, terpenoids, quinones, and alkaloids, can increase the expression of autophagy-associated proteins microtubule-associated protein 1 light chain 3 (LC3)Ⅱ/Ⅰ, autophagy-related gene (ATG)5, ATG7, inhibit the expression of autophagy-related protein p62 , and induce autophagy in digestive system tumor cells, thereby exerting the anti-digestive system tumor effect. By summarizing the research results in recent years on the modulation of cell autophagy by active ingredients in TCM to fight against digestive system tumors, this paper analyzed the relevant signaling pathways, regulatory factors, and functional characteristics of cell autophagy modulation, so as to elucidate the mechanism by which active ingredients of TCM induce autophagy and to provide ideas and references for clinical application.
9.Molecular Mechanism of Astragali Radix and Hedyotis diffusa in Regulating LINC01134-CTCF-p21 Axis to Inhibit Lung Adenocarcinoma Proliferation
Haipeng SUN ; He ZHUANG ; Xue LIU ; Siyuan LIU
Chinese Journal of Experimental Traditional Medical Formulae 2026;32(3):131-138
ObjectiveTo explore the interaction and competitive binding of Homo sapiens long intergenic non-protein-coding RNA 1134 (LINC01134) to CCCTC-binding factor CTCF, affecting the transcription of cyclin-dependent kinase inhibitor (p21) and influencing the proliferation of A549 cells, in order to investigate the possible mechanism of Astragali Radix and Hedyotis diffusa (A-H) in inhibiting A549 proliferation by regulating this axis. MethodsRNA-binding protein immunoprecipitation (RIP) assays were conducted to examine the interaction between LINC01134 and CTCF, and chromatin immunoprecipitation (ChIP) assays were used to study the effect of LINC01134 overexpression on the interaction between CTCF and p21. Stable A549 cell lines (oe-NC and oe-LINC01134) were established using lentiviral transfection, and each group was treated with 10% A-H drug-containing serum. Real-time PCR and Western blot analyses were performed to detect the effects of A-H on the expression of LINC01134, CTCF, and p21 in A549 cells. Cell counting kit-8 (CCK-8) and colony formation assays were used to assess the effects of A-H on A549 cell proliferation via LINC01134. Flow cytometry was employed to evaluate the effects of A-H on the A549 cell cycle through LINC01134, and Western blot was used to detect changes in cell cycle proteins. ResultsCompared with the IgG group, the oe-CTCF group showed a significantly increased abundance of LINC01134 aggregates (P0.01). Compared with the oe-Vector group, p21 abundance in CTCF complexes was significantly reduced in the oe-LINC01134 group (P0.01). Compared with the 10% blank + oe-LINC01134 group, the 10% A-H + oe-LINC01134 group reversed the expression of LINC01134 and p21 (P0.05), but had no significant regulatory effect on CTCF. Compared with the 10% blank + oe-LINC01134 group, the 10% A-H + oe-LINC01134 group reversed cell viability at 72 h (P0.05), inhibited malignant proliferation (P0.05), and reversed the proportions of cells in the G0/G1 and S phases (P0.01). Furthermore, compared with the 10% blank + oe-LINC01134 group, the 10% A-H + oe-LINC01134 group reversed the expression of Cyclin D1, CDK4, Cyclin E, CDK2, phosphorylated retinoblastoma protein (p-Rb), and E2F transcription factor 3 (E2F3) (P0.01). ConclusionA-H regulates the LINC01134-CTCF-p21 axis to block the G1/S phase transition of A549 cell cycle, accelerate cellular senescence, and inhibit malignant proliferation.
10.Phlorizin Ameliorates Glucose and Lipid Metabolism Disorders in T2DM Rats by Modulating IRS-1/PI3K/Akt Signaling Pathway
Nuer AILI ; Qingyu CAO ; Huan LIU ; Junwei HE ; Weihong ZHONG ; Lan CAO
Chinese Journal of Experimental Traditional Medical Formulae 2026;32(3):139-148
ObjectiveTo observe the pharmacodynamic efficacy of phlorizin in improving hepatic glycolipid metabolism disorders in type 2 diabetic mellitus (T2DM) rats and to explore its mechanism of action based on the insulin receptor substrate-1 (IRS-1)/phosphatidylinositol 3-kinase (PI3K)/protein kinase B (Akt) signaling pathway. MethodsA high-fat diet and streptozotocin (STZ) were used to establish T2DM rat models. The rats were randomly assigned into six groups: the blank control group, model group, metformin group (300 mg·kg-1), and phlorizin high-dose (100 mg·kg-1) and low-dose groups (25 mg·kg-1). The rats were given intragastric administration for 6 weeks. The changes in body weight and fasting blood glucose (FBG) were observed, and the oral glucose tolerance test (OGTT) was carried out. The levels of total cholesterol (TC), triglyceride (TG), low-density lipoprotein cholesterol (LDL-C), high-density lipoprotein cholesterol (HDL-C), glycated serum protein (GSP), aspartate aminotransferase (AST), and alanine aminotransferase (ALT) in serum were detected by an automatic biochemical analyzer. The levels of fasting insulin (FINS), interleukin (IL)-1β, IL-6, and tumour necrosis factor (TNF)-α were detected by enzyme-linked immunosorbent assay (ELISA). The levels of superoxide dismutase (SOD) and malondialdehyde (MDA) were detected by the biochemical assays. The pancreas index, liver index, and insulin resistance index were calculated. Hematoxylin-eosin (HE) staining was used to evaluate the pathological changes in liver and pancreatic tissues. The immunofluorescence method was used to detect the changes in insulin and glucagon in pancreatic tissue. Western blot was used to detect the expression of related proteins in the IRS-1/PI3K/Akt pathway of liver tissue and its downstream glycogen synthase kinase-3β (GSK-3β) and forkhead box transcription factor O1 (FoxO1) proteins. ResultsCompared with the blank control group, the body weight of rats in the model group continued to decrease, while the FBG level increased significantly. The area under the OGTT blood glucose curve (AUC), GSP, TC, TG, LDL-C, IL-1β, IL-6, TNF-α, MDA, pancreatic index and liver index increased significantly, while the levels of HDL-C, SOD, and FINS decreased significantly (P0.05, P0.01). Histological results showed that the pancreatic islets of rats in the model group exhibited atrophy and severe structural abnormalities. The insulin-positive β-cells decreased significantly (P0.01), while the glucagon-positive α-cells increased significantly (P0.01). Inflammatory cell infiltration and partial necrosis were observed in the liver tissues of the model group rats. The expressions of p-IRS-1/IRS-1, p-GSK-3β/GSK-3β, and p-FoxO1/FoxO1 proteins in the liver of the model group increased significantly (P0.01), while the expressions of p-PI3K/PI3K and p-Akt/Akt proteins decreased significantly (P0.01). Compared with the model group, the diabetic symptoms of rats in all administration groups were improved. The changes in body weight and FBG were close to those of the blank control group. The levels of OGTT-AUC, GSP, TC, TG, LDL-C, MDA, IL-1β, IL-6, TNF-α and the pancreatic index, liver index were obviously reduced (P0.05, P0.01), while the levels of HDL-C, SOD, and FINS obviously increased (P0.05, P0.01). The pathological changes of the pancreas and liver in rats in all treatment groups were effectively improved. The insulin-positive β-cells in the pancreas increased significantly (P0.01), while the glucagon-positive α-cells decreased significantly (P0.01). The protein expressions of p-IRS-1/IRS-1, p-GSK-3β/GSK-3β, and p-FoxO1/FoxO1 in the liver were significantly reduced (P0.01), while the protein expressions of p-PI3K/PI3K and p-Akt/Akt significantly increased (P0.01). ConclusionPhlorizin reversed the weight loss and abnormal increase of FBG in T2DM rats, improved blood lipid profiles, oxidative stress, and inflammatory levels, alleviated insulin resistance, and had certain protective effects on the liver and pancreas. The hypoglycemic mechanism may involve regulating the IRS-1/PI3K/Akt signaling pathway to inhibit the activities of GSK-3β and FoxO1, thereby promoting liver glycogen synthesis and suppressing hepatic gluconeogenesis, ultimately improving glycolipid metabolism disorders.

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