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1.
Chinese Journal of Radiological Health ; (6): 33-39, 2024.
Article in Chinese | WPRIM | ID: wpr-1012767

ABSTRACT

Objective To investigate the role of hydrogen therapy in reducing radiation-induced lung injury and the specific mechanism. Methods Forty C57BL/6 mice were randomly divided into four groups: normal control group, model group, hydrogen therapy group I, and hydrogen therapy group II. A mouse model of radiation-induced lung injury was established. The pathological changes in the lung tissue of the mice were examined with HE staining. Immunofluorescence staining was used to detect the expression of surface markers of M1 and M2 macrophages to observe macrophage polarization. The expression of interleukin (IL)-6, tumor necrosis factor-α (TNF-α), and IL-10 in the lung tissue was measured by immunohistochemistry. The expression of nuclear factor-kappa B (NF-κB) p65 and phosphorylated NF-κB (P-NF-κB) p65 was measured by Western blot. Results HE staining showed that compared with the control group, the model group exhibited alveolar septal swelling and thickening, vascular dilatation and congestion, and inflammatory cell infiltration in the lung tissue; the hydrogen groups had significantly reduced pathological damage and inflammatory response than the model group, with more improvements in hydrogen group II than in hydrogen group I. Immunohistochemical results showed that compared with those in the control group, the levels of the inflammatory cytokines IL-6 and TNF-α were significantly increased in the model group; the hydrogen groups showed significantly decreased IL-6 and TNF-α levels and a significantly increased level of the anti-inflammatory factor IL-10 than the model group, which were more marked in hydrogen group II than in hydrogen group I. Immunofluorescence results showed that compared with the control group, the expression of the surface marker of M1 macrophages in the model group was significantly upregulated; the hydrogen groups showed significantly downregulated M1 marker and significantly upregulated M2 marker, and hydrogen group II showed significantly increased M2 marker compared with hydrogen group I. Western blot results showed that compared with that in the control group, the ratio of P-NF-κB p65/NF-κB p65 in the model group was significantly increased; the P-NF-κB p65/NF-κB p65 ratio was significantly reduced in the hydrogen groups than in the model group, and was significantly lower in hydrogen group II than in hydrogen group I. Conclusion Hydrogen inhalation therapy may reduce the inflammatory response of radiation-induced lung injury by inhibiting the NF-κB signaling pathway to promote the polarization of the macrophage M1 subtype to the M2 subtype.

2.
Chinese Journal of Experimental Traditional Medical Formulae ; (24): 272-280, 2024.
Article in Chinese | WPRIM | ID: wpr-1011468

ABSTRACT

Liver failure (LF) is a great trouble to the majority of patients due to its severe onset, many complications, difficult treatment, poor prognosis and other characteristics. This disease is liver injury caused by infection, hepatotoxic substances, autoimmunity, circulation disorders and other factors. It is a group of common clinical symptoms mainly manifested by coagulation disorders, jaundice, hepatic encephalopathy, ascites, and so on. In traditional Chinese medicine, it falls under the categories of "tympanites", "jaundice" and other diseases. At present, the research progress of Western medicine in the treatment of LF is slow, and its clinical application effect is still not ideal. In contrast, traditional Chinese medicine has a long history in the treatment of this disease, with over thousands of years of clinical practice and verification. It is characterized by exact efficacy and fewer side effects. The pathological mechanism of LF is extremely complex, involves a variety of signaling pathways, and is mainly related to inflammation, oxidative stress, liver fibrosis, cell apoptosis and other processes. In recent years, many studies have shown that traditional Chinese medicine can intervene in the occurrence and development of LF by mediating relevant signaling pathways in vivo, but there is still a lack of relevant summary. Therefore, this review summarized several signaling pathways related to the intervention of traditional Chinese medicine in LF by referring to and sorting out relevant literature worldwide, including nuclear factor kappa B (NF-κB), mitogen-activated protein kinase (MAPK), phosphatidylin-ositol-3-kinase/protein kinase B (PI3K/Akt), transforming growth factor-β/ drosophila mothers against decapentaplegic proteins (TGF-β/Smads), and nuclear factor erythroid 2-related factor 2/heme oxygenase-1 (Nrf2/HO-1), and elaborated the specific mechanism of their intervention in LF. This paper aims to provide practical and effective pathways and corresponding mechanisms for the treatment of LF by traditional Chinese medicine, and to provide new ideas and a theoretical basis for the clinical treatment of LF and further scientific research.

3.
Journal of Southern Medical University ; (12): 852-858, 2023.
Article in Chinese | WPRIM | ID: wpr-986997

ABSTRACT

OBJECTIVE@#To explore the molecular pathological mechanism of liver metabolic disorder in severe spinal muscular atrophy (SMA).@*METHODS@#The transgenic mice with type Ⅰ SMA (Smn-/- SMN20tg/2tg) and littermate control mice (Smn+/- SMN20tg/2tg) were observed for milk suckling behavior and body weight changes after birth. The mice with type Ⅰ SMA mice were given an intraperitoneal injection of 20% glucose solution or saline (15 μL/12 h), and their survival time was recorded. GO enrichment analysis was performed using the RNA-Seq data of the liver of type Ⅰ SMA and littermate control mice, and the results were verified using quantitative real-time PCR. Bisulfite sequencing was performed to examine CpG island methylation level in Fasn gene promoter region in the liver of the neonatal mice.@*RESULTS@#The neonatal mice with type Ⅰ SMA showed normal milk suckling behavior but had lower body weight than the littermate control mice on the second day after birth. Intraperitoneal injection of glucose solution every 12 h significantly improved the median survival time of type Ⅰ SMA mice from 9±1.3 to 11± 1.5 days (P < 0.05). Analysis of the RNA-Seq data of the liver showed that the expression of the target genes of PPARα related to lipid metabolism and mitochondrial β oxidation were down-regulated in the liver of type Ⅰ SMA mice. Type Ⅰ SMA mice had higher methylation level of the Fasn promoter region in the liver than the littermate control mice (76.44% vs 58.67%). In primary cultures of hepatocytes from type Ⅰ SMA mice, treatment with 5-AzaC significantly up-regulated the expressions of the genes related to lipid metabolism by over 1 fold (P < 0.01).@*CONCLUSION@#Type Ⅰ SMA mice have liver metabolic disorder, and the down-regulation of the target genes of PPARα related to lipid and glucose metabolism due to persistent DNA methylation contributes to the progression of SMA.


Subject(s)
Mice , Animals , PPAR alpha , Liver Diseases , Muscular Atrophy, Spinal/genetics , Mice, Transgenic , Body Weight , Glucose
4.
Acta Pharmaceutica Sinica ; (12): 3539-3548, 2023.
Article in Chinese | WPRIM | ID: wpr-1004637

ABSTRACT

Cancer and cardiovascular diseases are the two major causes of death worldwide. The application of anti-tumor drugs has significantly improved the prognosis of patients, the cardiovascular toxicity caused by the application of them has become an important factor affecting the survival and prognosis of cancer patients. Therefore, the prevention and treatment of cardiovascular toxicity related to cancer treatment is increasingly important. The cardiovascular toxicity associated with anti-tumor drugs exhibits different clinical manifestations and involves multiple pathological mechanisms. This article reviews the current research progress from the perspective of the characteristics, molecular mechanisms and prevention and treatment strategies of cardiovascular toxicity caused by cancer drugs.

5.
Chinese Journal of Clinical Pharmacology and Therapeutics ; (12): 347-354, 2023.
Article in Chinese | WPRIM | ID: wpr-1014672

ABSTRACT

Frostbite is a tissue injury that occurs when the body is exposed to extreme cold. Its pathological mechanism is complex and has not been fully elucidated. In high cold and high altitude areas, outdoor sports people have a high risk of injury, and severe frostbite has high disability and mortality. Exploring the pathological mechanism of frostbite is helpful to determine the treatment methods and timing. At present, the clinical treatment of frostbite is mainly symptomatic treatment, such as drug treatment and surgical treatment, but the curative effect can not meet the clinical needs. Therefore, it is of great significance to seek more efficient drugs or treatment methods. This article reviews the relevant research progress in pathophysiological mechanism, clinical treatment, cellular and molecular pathways of frostbite in recent years, in order to provide new ideas for future research and clinical treatment.

6.
Chinese Pharmacological Bulletin ; (12): 1222-1227, 2023.
Article in Chinese | WPRIM | ID: wpr-1013767

ABSTRACT

Diabetic nephropathy (DN) is one of the most common and serious microvascular complications in patients with diabetes mellitus. Diabetic renal fibrosis ( DRF) is a major pathological change in the development of DN. In recent years the incidence of renal fibrosis (RF) has remained high. For diabetic patients, RF may expose them to kidney transplantation or even death, which brings a great burden to themselves and their families. Therefore, learning the pathogenesis and the current treat ment status of DRF is crucial for the treatment of the disease and the development of new drugs. Here we review the general situa¬tion of DN, the general situation, molecular mechanism, and the treatment of DRF,looking forward to providing a reference for the research and treatment of DRF.

7.
Chinese Pharmacological Bulletin ; (12): 2201-2204, 2023.
Article in Chinese | WPRIM | ID: wpr-1013671

ABSTRACT

Keloid is a fibrous proliferative disease of the skin, and its pathological essence is excessive wound healing caused by excessive fibrosis. Its pathological mechanism is complex and unclear. At present, it is believed that the cellular mechanism of keloids mainly involves inflammatory cells and fibrosis-related cells, as well as cytokines such as growth factors, interleukins, tumor necrosis factor, and matrix metalloproteinase; the molecular mechanism mainly involves TGF-p/Smad pathway, NF-Mo- lecular mechanisms such as kB pathway, STAT3 signaling pathway, MAPK signaling pathway, and focal adhesion kinase. This article reviews the latest research progress on the pathological mechanism of keloids from the perspectives of cells, cytokines, and molecular signaling pathways.

8.
Journal of Preventive Medicine ; (12): 582-586, 2023.
Article in Chinese | WPRIM | ID: wpr-980001

ABSTRACT

@#The incidence rate of vascular dementia is increasing year by year, and there is still no effective treatment at present, so it is very important to reduce the risk of developing vascular dementia. Research shows that diabetes is associated with vascular dementia. Based on the research literature related to diabetes and vascular dementia from January 1995 to April 2023, This article reviews the relationship between diabetes and vascular dementia, pathological mechanism and prevention and control strategies. It is found that diabetes can promote the occurrence and development of vascular dementia by inducing cerebrovascular disease, oxidative stress and inflammatory reaction, using hypoglycemic drugs, removing the incentives of cerebrovascular disease, maintaining the stability of blood-brain barrier and adhering to a healthy lifestyle are the main measures for the prevention and control of vascular dementia at this stage. Future research needs to further explore the mechanism of vascular dementia induced by diabetes, and seek economic and effective prevention targets.

9.
Chinese Journal of Neurology ; (12): 1324-1329, 2022.
Article in Chinese | WPRIM | ID: wpr-958033

ABSTRACT

Multiple sclerosis (MS) is typically considered to be a chronic inflammatory-demyelinating disease of central nervous system white matter, and less attention is paid to its cortical damage. With the application of immunohistochemical and imaging techniques that are more sensitive to cortical demyelination, more and more evidence has shown that lesions are also often located in the cortex of MS patients. As research progresses, the mechanisms of cortical damage are more likely associated with meningeal inflammation, and the extent of cortical lesion involvement becomes more widespread with disease progression, and cortical lesion burden positively correlates with the severity of physical and cognitive impairments. In recent years, a new subtype of MS, with lesions involving only the cerebral cortex and spinal cord, has been reported in Lancet through pathological study of 100 autopsy cases of MS, which is different from classical MS with white matter lesions, and enriches the connotation of cortical damage of MS.

10.
Chinese Journal of Experimental Traditional Medical Formulae ; (24): 232-239, 2022.
Article in Chinese | WPRIM | ID: wpr-940817

ABSTRACT

Atherosclerotic cardiovascular disease is a common disease with high incidence rate and mortality worldwide. Atherosclerosis is an important pathological basis for the formation of ischemic cardiovascular diseases such as cardiovascular disease, which is related to inflammation, oxidative stress, apoptosis, vascular endothelial damage, foam cell formation, platelet activation, and so on, involving mitogen-activated protein kinase (MAPK), phosphoinositide 3-kinase/protein kinase B (PI3K/Akt), cyclic adenosine monophosphate/protein kinase A (cAMP/PKA), Ras homolog gene family member A (RhoA)/Rho-associated coiled-coil containing protein kinase (ROCK), nuclear factor-kappa B (NF-κB), and other signaling pathways. In the past few decades, high-intensity statins were mainly used to treat atherosclerosis by reducing blood lipid levels, which usually caused obvious side effects. Therefore, the development of safer and more effective drugs and treatment modes is the focus of research at this stage. In recent years, Chinese medicine has been playing an increasingly important role in the prevention and treatment of cardiovascular diseases in China. There are many studies on the mechanism of Chinese medicine in the prevention and treatment of atherosclerosis, and it is found that a variety of single Chinese medicine regulate the formation process of atherosclerosis by regulating targeted signal molecules. This paper reviewed the research results of related signaling pathways involved in the pathological formation of atherosclerosis and the mechanism of Chinese medicine in the prevention and treatment of cardiovascular diseases, thereby providing references for the clinical treatment of cardiovascular diseases.

11.
Acta Pharmaceutica Sinica ; (12): 287-295, 2022.
Article in Chinese | WPRIM | ID: wpr-922905

ABSTRACT

Diabetic retinopathy (DR), one of the common complications of diabetes, is the main cause of blindness. Due to the limitations of the existing clinical treatment methods, it is urgent to develop new targets or/and new therapeutic drugs. This review summarizes the clinical trials of anti-DR drugs in recent years, and we note that gene therapy is a potential direction for DR treatment development. Due to the characteristics of ocular structure, including small size, a relatively independent organ, immune privilege and the opportunity for local administration, gene therapy could well be advantageous in the treatment of DR. Furthermore, the long-term therapeutic effects of gene therapy also improve compliance by DR patients. All these indicate that gene therapy is likely a future direction for development of DR therapies.

12.
Chinese Journal of Experimental Ophthalmology ; (12): 852-856, 2021.
Article in Chinese | WPRIM | ID: wpr-908597

ABSTRACT

Objective:To investigate the breakdown of blood-retinal outer barrier in the ischemia-reperfusion injury mice following acute intraocular hypertension.Methods:Fifty-seven SPF male C57BL/6J mice were selected and divided into the control group and high-intraocular pressure (IOP) group by using the random number table method.There were 25 mice in the control group and 32 mice in the high-IOP group.After the failure and poor modeling excluded, 20 mice were included in each group, and the left eyes were selected as the experimental eyes.The ischemia-reperfusion injury model of the high-IOP group was established following acute intraocular hypertension by anterior chamber perfusion of 0.9% sodium chloride solution, and the control group only received anterior chamber puncture.Optical coherence tomography was used to detect retinal thickness.Immunofluorescence staining was utilized to identify zonula occludens-1 (ZO-1) protein distribution in retina.Retinal capillary degeneration was identified by trypsin digestion.Inflammatory cell infiltration in retinal sections was observed by hematoxylin and eosin staining.The use and care of the animals complied with the Statement of the Association for Research in Vision and Ophthalmology, and the study protocol was approved by an Ethics Committee of Changsha Aier Eye Hospital (No.2018-KYPJ005).Results:Compared with the control group, the structure of the retinal pigment epithelium (RPE) layer was irregular with obvious exudation and local neuroepithelial detachment and elevation.The thickness of the full retinal layer of mice in the high-IOP group was (235.8±5.3)μm, which was significantly thicker than (213.3±3.9)μm in the control group ( t=3.427, P=0.009). ZO-1 staining results showed that ZO-1 was mainly located in cell membrane and a small part in cytoplasm in the RPE layer of mice.Two days after modeling, ZO-1 in the high-IOP group was significantly internalized with decrease in cell membrane and increase in cytoplasm, and its distribution was irregular.Seven days after modeling, retinal capillary degeneration was observed in the high-IOP group, and the number of degenerated retinal capillaries was 201.0±13.2, which was significantly larger than 11.2±1.7 in the control group ( t=14.280, P<0.01). Hematoxylin-eosin staining results showed that inflammatory cell infiltration, mainly neutrophils, could be observed in the mice retina with high IOP, and the infiltrated inflammatory cells were mainly located under the internal limiting membrane. Conclusions:Acute intraocular hypertension induced retinal ischemia-reperfusion injury in mice destroys the integrity of the outer retinal barriers, and causes granulocyte infiltration in the peripheral circulation, retinal edema as well as retinal capillary degeneration.

13.
Journal of Xi'an Jiaotong University(Medical Sciences) ; (6): 103-107, 2021.
Article in Chinese | WPRIM | ID: wpr-1006779

ABSTRACT

Coronavirus disease 2019 has become a pandemic. The transmission of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) is strong, and the population is generally susceptible. The virus enters target cells via angiotensin-converting enzyme 2 as a cellular receptor.Spike protein is activated by serine protease TMPRSS2. The virus can cause damage to multiple organs, and there are currently no specific drugs for this virus. However, several assessments and studies have been carried out. At present, the epidemic situation in China has been effectively controlled. However,the number of infections abroad has increased rapidly. Therefore, the epidemic situation in foreign countries is still very serious. The global epidemic prevention and control work is facing huge challenges. In order to effectively prevent and treat coronavirus disease 2019, this article reviews the etiology, pathological mechanism, pathological manifestations, and development of therapeutic drugs for coronavirus disease 2019.

14.
Chinese Journal of Ultrasonography ; (12): 1081-1087, 2021.
Article in Chinese | WPRIM | ID: wpr-932366

ABSTRACT

Objective:To evaluate the pathological features of a heart failure with preserved ejection fraction(HFpEF) model, which is established by spontaneously hypertensive rats (SHR) through high-fat diet and diabetic factors.Methods:Twenty specific pathogen-free grade(SPF grade) and 14-week-old SHR rats were randomly divided into SHR group (normal diet) and HFpEF group [high-fat diet combined with intraperitoneal injection of streptozotocin (STZ, 25 mg/kg) were used to create a diabetic complex model] with 10 rats in each group. Ten SPF and 14-week-old WKY rats with the same genetic background were set as blank control group (WKY group). All rats were fed for 8 weeks. Echocardiography was performed to measure cardiac parameters: peak velocity of early diastolic mitral inflow(E), peak velocity of late diastolic mitral inflow(A), and the early diastolic mitral annulus e′ in the same cardiac cycle, left atrial ejection fraction (LAEF), left ventricular ejection fraction (LVEF), left atrial diameter, right atrial diameter and interventricular septal thickness(IVST). Serological testing included glucose (GLU) and glycosylated serum protein (GSP); Enzyme-linked immunoassay (ELISA) testing included insulin (INS), glucagon (PG), C-peptide (CP), leptin (LEP), atrial natriuretic peptide (ANP) and B-type brain natriuretic peptide (BNP). The rat heart tissue was stained with HE, and the morphological changes of atrial/ventricular tissue were observed under an optical microscope.Results:The pathological characteristics of HFpEF was established in SHR rats fed with high fat and diabetes. Echocardiography showed that compared with the WKY group, the values of E, E/A and E/e′ in the HFpEF group were significantly increased (all P<0.01), and e′and LAEF were significantly reduced (all P<0.01). In the HFpEF group, the anteroposterior and tranverse dimensions of the left atrium and the long-axis dimension of the right atrium increased to varying degrees (all P<0.05), and the IVST was also significantly increased ( P<0.01). At the same time, atrial wall was thickened obviously, myocardial cells were disordered, and myocardial fibers were broken. Compared with the WKY group, the levels of serum markers ANP and BNP in HFpEF group were significantly increased (all P<0.01), and the levels of serum insulin-related indicators INS, PG, CP, LEP, GSP, and GLU increased to varying degrees (all P<0.01). Conclusions:The composite model established by SHR rats through high-fat diet and diabetic factors can simulate the Doppler echocardiographic changes and pathological features of HFpEF, as well as abnormal changes in serum related markers and insulin indicators.

15.
Chinese Journal of Experimental Traditional Medical Formulae ; (24): 227-240, 2020.
Article in Chinese | WPRIM | ID: wpr-872975

ABSTRACT

Stroke is a devastating cerebrovascular event that occurs as a result of cerebral vascular occlusion (ischemic stroke) or burst/bleeding (hemorrhagic stroke) leading to cerebral blood flow disruption, causing physical disability and multiple functional impairment. The incidence of ischemic stroke is higher than hemorrhagic stroke, accounting for more than half of the total incidence of stroke. The main cause of the disease is caused by atherosclerosis, various arteritis, trauma and other plaques that cause cerebral vascular disease, which may be caused by a variety of cardiovascular diseases such as atrial fibrillation. Blood, caused by blocking blood vessels in the brain. Due to the complexity of the causes of ischemic stroke, the pathogenesis and development mechanism are complex and diverse, such as energy failure, excitotoxicity, neuroinflammation, apoptosis and oxidative stress. Traditional Chinese medicine and compound have the characteristics of multi-component, multi-target, multi-effect, and can be applied to the treatment of different stages of stroke occurrence and development. Therefore, an in-depth understanding of the pathological process and related mechanisms of ischemic stroke, and the development of targeted drugs, is important to prevent the occurrence of ischemic stroke and control its development. In this paper, the timeline of the occurrence and development of ischemic stroke is the main line. The pathological process and related mechanisms are systematically reviewed. The most widely used traditional Chinese medicine and compound in clinical and basic research are summarized, in order to study the pathological study of ischemic stroke. Clinical treatment provides a theoretical basis and data reference.

16.
Chinese Journal of Tissue Engineering Research ; (53): 282-288, 2020.
Article in Chinese | WPRIM | ID: wpr-848098

ABSTRACT

BACKGROUND: Tendinopathy is a hotspot in the fields of sports medicine and rehabilitation, but there have been many controversies about the concept, mechanism and pathological stages of tendinopathy for a long. OBJECTIVE: To systematically review and summarize the related concepts of tendinopathy, the role of inflammation in the occurrence of tendinopathy and the pathological mechanism of tendinopathy. METHODS: CNKI, VIP, CBM, WanFang, PubMed and Embase databases were searched. From the aspects of tendinopathy, enthesis, inflammation and pathological mechanism, some related research results since 1990 were retrieved and summarized. RESULTS AND CONCLUSION: The results show that the debate on the concept of tendinopathy is based on the understanding of its pathological mechanism, and the understanding of the pathological mechanism of tendinopathy will continue to be improved with the emergence of more high-quality researches. The research on the relationship between tendinopathy and inflammation, the relationship between tendinopathy and load patterns, and the mechanical characteristics of enthesis will be a future focus.

17.
Journal of Shanghai Jiaotong University(Medical Science) ; (12): 342-346, 2019.
Article in Chinese | WPRIM | ID: wpr-743425

ABSTRACT

Objective · To investigate the effect of Toll-like receptor 4 (TLR4) in the pathological injury in fat embolism mice model. Methods · One hundred and twenty male C57BL/6 mice were randomly divided into 10 groups. One group was set as blank control group, and others were injected separately with 1, 2…9 μL/g of allogeneic perirenal fat via tail vein, respectively. The mortality of each group was counted, median lethal dose (LD50) of fat injection in mice was calculated by Bliss method, and the fat embolism LD50 mice model was established. The TLR4 protein expression in the pulmonary tissue of surviving mice was detected by Western blotting. Sixty male C57BL/6 mice were randomly divided into the control group (the same dose of saline was given via tail vein) and the experimental groups (group 2 h, group 8 h, group 24 h and group 48 h, the LD50 fat was given via tail vein).The TLR4 protein expression at different time after fat injection was detected by Western blotting. The mortality of 20 TLR4 gene-knockout mice (TLR4-/-mice) was recorded and compared with 60 wild-type mice after LD50 fat injection. Results · The LD50 of fat embolism mice model was (3.93±0.78) μL/g.After the injection of 1-7 μL/g fat, the expressions of TLR4 protein in the pulmonary tissue of all seven groups were significantly increased, compared with the control group (all P=0.000). In the fat embolism LD50 mice model, compared with the control group, the expressions of TLR4 protein in group2 h were significantly increased (P=0.005). Then, expression level of TLR4 protein was gradually reduced after 2 h, and there was no significant difference between the control group and group 48 h. The mortality of TLR4-/- mice injected with LD50 fat was lower than that of wild-type mice (P=0.043).Conclusion · TLR4 protein involves in the pathologic process of fat embolism syndrome. The knockout of TLR4 gene can reduce the mortality of fat embolism mice. TLR4 and its correlated non-infectious inflammatory response may be an important molecular mechanism of biochemical injury in fat embolism syndrome. Blocking the activation of TLR4-mediated signaling pathway can significantly improve the prognosis, which provides new basis for the prevention, evaluation and treatment of fat embolism syndrome.

18.
Journal of Shanghai Jiaotong University(Medical Science) ; (12): 342-346, 2019.
Article in Chinese | WPRIM | ID: wpr-843453

ABSTRACT

Objective • To investigate the effect of Toll-like receptor 4 (TLR4) in the pathological injury in fat embolism mice model. Methods • One hundred and twenty male C57BL/6 mice were randomly divided into 10 groups. One group was set as blank control group, and others were injected separately with 1, 2…9 μL/g of allogeneic perirenal fat via tail vein, respectively. The mortality of each group was counted, median lethal dose (LD50) of fat injection in mice was calculated by Bliss method, and the fat embolism LD50 mice model was established. The TLR4 protein expression in the pulmonary tissue of surviving mice was detected by Western blotting. Sixty male C57BL/6 mice were randomly divided into the control group (the same dose of saline was given via tail vein) and the experimental groups (group 2 h, group 8 h, group 24 h and group 48 h, the LD50 fat was given via tail vein). The TLR4 protein expression at different time after fat injection was detected by Western blotting. The mortality of 20 TLR4 gene-knockout mice (TLR4-/- mice) was recorded and compared with 60 wild-type mice after LD50 fat injection. Results • The LD50 of fat embolism mice model was (3.93±0.78) μL/g. After the injection of 1-7 μL/g fat, the expressions of TLR4 protein in the pulmonary tissue of all seven groups were significantly increased, compared with the control group (all P=0.000). In the fat embolism LD50 mice model, compared with the control group, the expressions of TLR4 protein in group 2 h were significantly increased (P=0.005). Then, expression level of TLR4 protein was gradually reduced after 2 h, and there was no significant difference between the control group and group 48 h. The mortality of TLR4-/- mice injected with LD50 fat was lower than that of wild-type mice (P=0.043). Conclusion • TLR4 protein involves in the pathologic process of fat embolism syndrome. The knockout of TLR4 gene can reduce the mortality of fat embolism mice. TLR4 and its correlated non-infectious inflammatory response may be an important molecular mechanism of biochemical injury in fat embolism syndrome. Blocking the activation of TLR4-mediated signaling pathway can significantly improve the prognosis, which provides new basis for the prevention, evaluation and treatment of fat embolism syndrome.

19.
Chinese Pharmacological Bulletin ; (12): 451-455, 2019.
Article in Chinese | WPRIM | ID: wpr-857343

ABSTRACT

Toll-like receptor (TLR)/MyD88/NF-KB signaling pathway is an important pathway in the body's inflammatory system. It is widely distributed in various tissue cells and participates in the regulation and regulation of various diseases, such as autoimmune diseases, inflammatory diseases, and infectious diseases, allergic diseases, etc. The TLR is a transmembrane protein that recognizes multiple types of pathogen-associated molecular patterns (such as lipopolysaccharide, sodium urate crystals, viral double-stranded RNA, etc.), causing an inflammatory immune response in body, and all TLRs are activated. The MyD88-dependent pathway thereby activates NF-κB, which ultimately leads to the release of inflammatory mediators and cytokines and acts as an anti-inflammatory immune regulator. At present, the research on TLR/MyD88/NF-κB signaling pathway is more in-depth, and has witnessed more progress. This article starts with the mechanism of action of TLR/MyD88/NF-κB signaling pathway in body and reviews its regulation in different diseases.

20.
Chinese Traditional and Herbal Drugs ; (24): 5426-5434, 2018.
Article in Chinese | WPRIM | ID: wpr-851564

ABSTRACT

Adriamycin-induced nephritic model is one of the well-recognized models in simulating human nephropathy, whose clinical manifestations of animal models are similar to human nephrotic syndrome, and its cell models are widely used in the pathological mechanism study of nephropathy because of the well-simulated basic function of glomerular podocyte. Based on the animal models and cell models in vitro of adriamycin nephropathy, this study aims at reviewing the modelling method and pathological mechanism of adriamycin-induced nephritic model in order to provide a scientific and rational pharmacological experimental model reference for drug research and development based on kidney disease, and provide evidence for the research of the mechanism of Chinese herbal compound in the treatment of nephropathy.

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