ObjectiveTo investigate the changes of fibrinogen and classical markers of collagen metabolism [carboxy-terminal propeptide of type Ⅰ procollagen (PICP) and carboxy-terminal cross-linked peptide of type Ⅰ collagen (ICTP)] in peripheral blood and pericardial drainage after coronary artery bypass grafting (CABG) and/or heart valve replacement (VR), and to evaluate their relationship with postoperative atrial fibrillation (POAF) after cardiac surgery. MethodsPatients who underwent CABG and/or VR in the Heart Center of Beijing Chao-Yang Hospital from March to June 2021 were included. Peripheral blood and pericardial drainage fluid samples were collected before surgery and at 0 h, 6 h, 24 h and 48 h after surgery to detect PICP, ICTP and fibrinogen levels, and preoperative, intraoperative and postoperative confounding factors were also collected. PICP, ICTP and fibrinogen levels were measured by enzyme-linked immunosorbent assay (ELISA). ResultsA total of 26 patients with 125 blood samples and 78 drainage samples were collected. There were 18 males and 8 females with an average age of 64.04±7.27 years. The incidence rate of POAF was 34.6%. Among the factors, the fibrinogen level in pericardial drainage showed two peaks within 48 h after operation (0 hand 24 h after operation) in the POAF group, while it showed a continuous downward trend in the sinus rhythm (SR) group, and the change trend of fibrinogen in pericardial drainage was significantly different over time between the two groups (P=0.022). Fibrinogen in blood, PICP and ICTP in blood and drainage showed an overall decreasing trend, and their trends over time were not significantly different between the two groups of patients (P>0.05). Univariate analysis showed that fibrinogen at 24 h and 48 h after pericardial drainage, fibrinogen in preoperative blood, PICP immediately after surgery and right atrial long axis diameter were significantly higher or longer in the POAF group than those in the SR group. Multiple regression showed that fibrinogen≥11.47 ng/mL in pericardial drainage 24 h after surgery (OR=14.911, 95%CI 1.371-162.122, P=0.026), right atrial long axis diameter≥46 mm (OR=10.801, 95%CI 1.011-115.391, P=0.049) were independent predictors of POAF. ConclusionThis study finds the regularity of changes in fibrinogen and collagen metabolic markers after CABG and/or VR surgery, and to find that fibrinogen in pericardial drainage 24 h after surgery is a potential novel and predictive factor for POAF. The results provide a new idea for exploring the mechanism of POAF, and provide a research basis for the accurate prediction and prevention of clinical POAF.
Objective To investigate the significance of sensory neuropeptides [calcitonin gene related peptide (CGRP) and substance P (SP)] in steroid-induced avascular necrosis of the femoral head (ANFH) by using a rabbit model. Methods Fifty-five adult female Japanese White rabbits (weighing 3 kg and aging 24 months) were randomly divided into experimental group (n=45) and control group (n=10). The rabbits in experimental group received a single intramuscularinjection of methylprednisolone at a dose of 4 mg/kg and then were sacrificed after 3 days (n=15), 1 week (n=15), and 2 weeks (n=15) of injection. The rabbits in control group were fed without any treatment. The necrosis of the femoral head was observed. And the expressions of the monoclonal antibodies CGRP and SP were observed with immunohistochemical staining. Also, the integrated absorbance (IA) value of the positive area was calculated. Results All rabbits survived to the end of the experiment. There was no necrosis of the bone or bone marrow in experimental group at 3 days; whereas ANFH was observed in 5 rabbits at 1 week (33%) and in 8 rabbits at 2 weeks (53%). There were significant differences in the rate of ANFH between 1 week, 2 weeks and 3 days (P lt; 0.05); but there was no significant difference between 1 week and 2 weeks (P gt; 0.05). The intensity of CGRP immunoreactivity increased and reached the peak at 1 week, and then decreased at 2 weeks in experimental group. The IA value of CGRP in experimental group at 1 week was significantly higher than that of control group and that of experimental group at 3 days (P lt; 0.05). The IA value of CGRP in experimental group at 2 weeks was significantly lower than those at 3 days and 1 week (P lt; 0.05). The intensity of SP immunoreactivity decreased and reached the lowest at 1 week, and then increased. The IA value of SP in experimental group at 1 week was significantly lower than that of control group and that of experimental group at 2 weeks (P lt; 0.05). Conclusion The sensory neuropeptides may be affected by the steroid, which may play a key role in the process of steroid-induced ANFH by imbalance of bone metabol ism, disturbance of the microcirculation of bone, and disorder of the protective pain-transmission.
ObjectiveTo explore the relevance of the ratio of pulmonary arterial diameter to aortic diameter exceeding one (PA:A>1) with brain natriuretic peptide (BNP) and inflammatory factor levels in patients with acute exacerbation of chronic obstructive pulmonary disease (AECOPD).
MethodsFrom August 2013 to December 2013,95 inpatients with AECOPD in West China Hospital were divided into two groups according to the ratio of pulmonary arterial diameter to aortic diameter. The clinical data of the patients were collected. Meanwhile,arterial blood gas,plasma levels of BNP,C-reactive protein (CRP),and interleukin-6 (IL-6) within 24 hours were measured.
ResultsThe plasma BNP level was 2005(483-4582)ng/L in the group with PA:A>1,and 404(137-1224)ng/L in the group with PA:A<1. There was significant difference in plasma BNP level between two groups (P<0.01). There was no significant difference in CRP or IL-6 level between two groups (P>0.05).
ConclusionThe ratio of pulmonary arterial diameter to aortic diameter is correlated with BNP level in patients with AECOPD,but is not correlated with CRP or IL-6.
ObjectiveTo investigate the feasibility to culture rabbit annulus fibrosus cells on the KLD-12 polypeptide nanofiber gel so as to search for the seed cells and the scaffolds for tissue engineering.
MethodsThe rabbit annulus fibrosus cells were isolated with pancreatin and cultured; the cells at passage 3 were seeded on the KLD-12 polypeptide nanofiber gel to prepare the KLD-12 polypeptide/annulus fibrosus cells gel. The cell morphology change was observed by inverted microscope. The cell counting kit 8 (CCK-8) was used to detect the cell proliferation, and Calcein-AM/propidium iodide (PI) fluorescent staining to observe the cell vitality. The alcian blue method was used to measure the glycosaminoglycan (GAG) content, immunofluorescence technique to observe the collagen type II level, and real-time fluorescence quantitative PCR (RT-qPCR) to measure the mRNA expressions of Aggrecan and collagen type II.
ResultsThe cells on the scaffolds grew well, showing round shape on the scaffolds and spindle or fusiform shape at the edge of the scaffold. The cell proliferation exhibited increasing trend with time, and it was significantly higher at 14 days than the other time points (P < 0.05), and on KLD-12 polypeptide nanofiber gel than on blank gel (P < 0.05). The ratios of living cells were 89.32%±8.58% at 5 days and 97.81%±1.09% at 14 days, showing no significant difference (t=-1.962, P=0.097). The GAG content gradually increased with culture time, reached the peak at 8 days, and then gradually decreased; the GAG content at 5, 8, and 11 days was significantly higher than that at 2 and 14 days (P < 0.05). The level of collagen type II was normal. The mRNA expressions of collagen type II and Aggrecan could be measured at 5 and 14 days; the relative expression levels of collagen type II and Aggrecan mRNA were significantly higher at 14 days than 5 days (P < 0.05).
ConclusionThe rabbit annulus fibrosus cells on KLD-12 polypeptide nanofiber gel are able to grow well and to produce extracellular matrix, so KLD-12 polypeptide nanofiber gel has the potential to serve as a scaffold for the treatment of intervertebral disc degeneration.
Both bariatric surgery and pharmacotherapy, particularly glucagon-like peptide-1 receptor agonist (GLP-1RA), are effective interventions for obesity, yet each has its own advantages and limitations. Drawing on the “bridging” concept from cancer therapy, this commentary explores an innovative obesity management strategy that involves the combined application of GLP-1RA and bariatric surgery during the perioperative period, with the aim of optimizing treatment outcomes. The present analysis focuses specifically on the potential value of this approach: preoperatively, GLP-1RAs serve as a “bridging therapy” to promote weight loss and reduce surgical risks in severely obese patients; postoperatively, they might be used to manage weight rebound or insufficient weight loss. This multimodal integrated strategy is designed to overcome the inherent limitations of single therapies and offer patients more comprehensive treatment options. Emphasizing that future research must urgently focus on optimizing treatment parameters (e.g., timing, dosage), evaluating long-term safety and efficacy, and establishing patient selection criteria for combination therapy. Integrating surgical and pharmacological treatments, this comprehensive strategy based on the oncological “bridging” concept represents a highly promising paradigm shift in obesity management.
ObjectiveTo explore the feasibility of co-transduction and co-expression of Nogo extracellular peptide residues 1-40 (NEP1-40) gene and neurotrophin 3 (NT-3) gene into neural stem cells (NSCs).MethodsNSCs were derived from the cortex tissue of Sprague Dawley rat embryo. The experiment included 5 groups: no-load lentiviral vector transducted NSCs (group A), NEP1-40 transducted NSCs (group B), NT-3 transducted NSCs (group C), NEP1-40 and NT-3 corporately transducted NSCs (group D), and blank control (group E). Target genes were transducted into NSCs by lentiviral vectors of different multiplicity of infection (MOI; 5, 10, 15) for different time (24, 48, 72 hours). Fluorescent microscope was used to observe the expression of fluorescence protein and acquire the optimum MOI and optimum collection time. Real-time fluorescence quantitative PCR and Western blot tests were utilized to evaluate the gene expressions of NEP1-40 and NT-3 in NSCs and protein expressions of NEP1-40 and NT-3 in NSCs and in culture medium.ResultsThe optimum MOI for both target gene was 10 and the optimum collection time was 48 hours. The real-time fluorescence quantitative PCR and Western blot results showed that the mRNA and protein relative expressions of NEP1-40 in groups B and D were significantly higher than those in groups A and C (P<0.05), but no significant difference was found between groups B and D, and between groups A and C (P>0.05). The mRNA and protein relative expressions of NT-3 in groups C and D were significantly higher than those in groups A and B (P<0.05), but no significant difference was found between groups A and B, and between groups C and D (P>0.05).ConclusionNEP1-40 and NT-3 gene can be successfully co-transducted into NSCs by the mediation of lentiviral vector. The expressions of the two target genes are stable and have no auxo-action or antagonism between each other.
Diabetic retinopathy (DR) is one of the most serious complications of diabetes mellitus. Severe diabetic macular edema or proliferative retinopathy may lead to impaired vision or even blindness in diabetic patients. The glucagon-like peptide-1 receptor agonist (GLP-1RA) is now commonly used as novel glucose-lowering agents in the clinical management of type 2 diabetes, but the rapid glycaemic changes associated with the use of the GLP-1RA may aggravate the risk of an increase in the occurrence of short-term potential DR. Potential effects and mechanisms of DR include oxidative stress, vascular endothelial growth factor, inflammation, retinal neurodegeneration, and other cytokines.Whether GLP-1RA leads to the increased risk of DR remains controversial. More basic and clinical studies are needed with the aim of further clarifying the correlation between GLP-1RA and DR risk.
摘要:目的: 探討益活清下法早期聯用用丙氨酰谷氨酰胺二肽治療重癥急性胰腺炎(severe acute pancreatitis, SAP)的療效。 方法 :依據納入和排除標準,選取我院中西醫結合科收治的SAP80例,按1︰1隨機分成早期組(40例)和晚期組(40例),早期組入院時便應用丙氨酰谷氨酰胺二肽治療;晚期組入院5 d后加用丙氨酰谷氨酰胺二肽治療。 結果 :兩組入院時Ranson評分、CT評分、APACHEⅡ評分無統計學差異(P ＞005),治療15 d后早期組APACHEⅡ評分(497±239分)明顯低于晚期組(863±357分)(P ＜001);兩組并發ARDS、腎功能衰竭、休克、肝功能不全、心功能衰竭、腦病及腸麻痹的發生率無統計學差異(P ＞005);早期組ARDS、腎功能衰竭、休克、肝功能不全、腦病及腸麻痹持續時間及住院病程短于晚期組(P＜005 );早期組感染率、手術中轉率及病死率低于晚期組(P＜005 )。 結論 :益活清下法早期應用丙氨酰谷氨酰胺二肽治療SAP,可縮短并發癥的持續時間及病程,降低病死率和手術中轉率。Abstract: Objective: To compare the effects of integrated basal treatment of Chaiqin Chengqi Decoction with alanylglutamine Dipeptide giving in different times for sever acute pancreatitis. Methods : The randomized parallel control was adopted. 80 patients of SAP were randomized to earlytreated group (40 cases were treated by AlaGln as soon as who entered hospital) and latetreated group (40 cases were treated by AlaGln after 5 days from who had entered hospital). The mortality, incidences of complication, operation and mortality,the duration of complication and the course of diseases, hospitalization were compared. Results : The mortality shown that in earlytreated group was lower than the latertreated group, there was statistically significantly difference. Ranson score, CT score, Acute Physiology and Chronic Heath EvaluationⅡscore (APACHEⅡ score) and the incidences of complications were no statistical differencein the two groups(P ＞005)in the early stage of hospitalization. But the APACHEⅡ score (497±239)in earlytreated group was lower than those in latetreated group(863±357)after 15 days(P ＜001 The duration of acute respiratory distress syndrome(ARDS ),renal failure, shock, hepatic failure, encephalopathy and enteroplegia were shorter in earlytreated group than those in latetreated group(P＜005 . The incidence of infection, operation and mortality were lower in earlytreated group than those in latetreated group(P＜005 . The course of diseases of earlytreated group was shorter than that of latetreated group (P＜005 . Conclusion : SAP treated by (CQCQD) and AlaGln in early stage can shorten the duration of complications and the hospitalization period, and reduce the incidences of infection, operation rates and mortality rate.
ObjectiveTo study the hydrophilicity and the cell biocompatibility of the poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) and poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) (PHBHHx) coated with a fusion protein polyhydroxyalkanoates granule binding protein (PhaP) fused with Arg-Gly-Asp (RGD) peptide (PhaP-RGD).
MethodsPHBV and PHBHHx films were fabricated by solvent evaporation.Scanning electronic microscope (SEM) was used to study the morphology of the films.PhaP-RGD fusion proteins were expressed and purified by the technology of protein engineering; PHBV and PHBHHx films were immersed in the PhaP-RGD with an amount of 3.5 mg/mL protein/per sample respectively.The hydrophilicity of the surface were detected by the contact angle measurements.Septal cartilage cells obtained from human septal cartilage were cultured in vitro.The 2nd passage chondrocytes were incubated on PHBV unmodified with PhaP-RGD in group A1,PHBV modified with PhaP-RGD in group A2,PHBHHx unmodified with PhaP-RGD in group B1,PHBHHx modified with PhaP-RGD in group B2,and on the cell culture plates in group C.After cultured for 3 days,the proliferation of cells was detected by the DAPI staining; the proliferation viability of cells was detected by the MTT assay after cultured for 3 and 7 days; after cultured for 7 days,the adhesion and morphology of the cells on the surface of the biomaterial films were observed by SEM and the matrix of the cells was detected through the toluidine blue staining.
ResultsSEM observation showed that PHBV and PHBHHx films had porous structures.The contact angle of the surface of the PHBV and PHBHHx films modified with PhaP-RGD fusion proteins were significantly reduced when compared with the films unmodified with PhaP-RGD fusion proteins (P<0.05).Chondrocytes of human nasal septal cartilage incubated on the films could grow in all groups.After 3 days of cultivation in vitro,the cell proliferation and viability of group B2 were the strongest among all groups (P<0.05); the cell proliferation after cultured for 7 days was significantly stronger than that after cultured for 3 days in groups A1,A2,B1,and B2 (P<0.05); and the cell proliferation was significantly stronger in groups B1 and B2 than groups A1,A2 and C,in group B2 than group B1,and in group A1 than group A2 (P<0.05).The results of toluidine blue staining showed that blue metachromasia matrixes were observed in groups A1,A2,B1,and B2; group A1 and group A2 had similar staining degree,and the staining of group B2 was deeper than that of group B1.The adhesion of cells in all groups was good through SEM observation; and the connection of cells formed and stretched into the pores of the materials.
ConclusionThe biomaterial films of PHBHHx modified with PhaP-RGD fusion protein can promote its biocompatibility with chondrocytes.
Objective To evaluate the effects of the polypeptide growth factors on the periodontal ligament cell(PDLC) based on a comprehensive review onthe literature concerned. Methods The recent literature related to the effects of the polypeptide growth factors on the PDLC were extensivelyand comprehensively reviewed and a corresponding evaluation was made. Results The proliferation and the multidirectional differentiation of thePDLC were found to be the basis for the regeneration of the periodontal tissues. The effects of the polypeptide growth factors on the function of the PDLC became a hot issue of the research on the regeneration of the periodontal tissues. The polypeptide growth factors were found to play an important role in the migration, growth, proliferation, differentiation, and synthesis of protein and matrixof the PDLC. Conclusion The polypeptide growth factors can beused in the periodontal regeneration treatment, but a further research is stillrequired to improve this kind of treatment.
