Leukocyte-specific protein 1 (LSP1) is an F-actin binding protein expressed in various leukocytes, including lymphocytes, mononuclear macrophages, and neutrophils. LSP1 is highly conserved across different species. Human LSP1 protein contains 339 amino acids, featuring a Ca²⁺ binding site in the acidic NH2-terminal region and multiple F-actin binding domains along with phosphorylatable sites in the basic COOH-terminal region. Under Ca²⁺ regulation, the COOH-terminal domain of LSP1 binds to F-actin to regulate cell movement and signal transduction. Additionally, LSP1 activates the mitogen-activated protein kinase (MAPK) signaling pathway through phosphorylation mediated by protein kinase C (PKC) and MAPK-activated protein kinase-2, thereby regulating leukocyte proliferation and chemotaxis. The main effects of LSP1 on leukocytes are as follows: LSP1 plays important roles in neutrophil and macrophage migration, affecting cell adhesion, polarization and movement. LSP1 also functions in endothelial cells to regulate leukocyte transendothelial migration. In addition, LSP1 regulates macrophage phagocytosis through interaction with myosin 1e. Moreover, LSP1 regulates leukocyte proliferation and differentiation and plays significant roles in the development of leukemia and other tumors. In summary, LSP1 regulates leukocyte morphology, movement and function through interactions with cytoskeletal and signaling proteins. This review provides a comprehensive summary of these aspects.
Humans ; Leukocytes/cytology* ; Animals ; Cytoskeleton/metabolism* ; Microfilament Proteins/physiology* ; Cell Movement ; Signal Transduction

Objective:To analyze the clinical characteristics of patients with different types of coronavirus disease 2019 (COVID-19).Methods:A total of 272 eligible COVID-19 patients who were admitted to Guangzhou Eighth People′s Hospital, Guangzhou Medical University from January 22 to February 15, 2020 were retrospectively enrolled. General characteristics, the first laboratory examination and imaging data of these patients were collected. According to the clinical classification, there were 236 cases in non-severe group (mild+ common type) and 36 cases in severe group (severe+ critical type). Comparisons between groups were performed by t test, chi-square test or rank-sum test when appropriate. Results:There were 23 males and 13 females in the severe group, 103 males and 133 females in the non-severe group, and the difference was statistically significant ( χ2=5.149, P=0.023). The age of severe group was (60.5±11.2) years, which was higher than that of non-severe group (46.8±15.7) years. The difference was statistically significant ( t=6.43, P<0.01). The lymphocyte (LYM) count, platelet (PLT) count and arterial partial pressure of oxygen (PaO 2) in the severe group were 0.90(0.55, 1.10)×10 9/L, 170.00(143.50, 198.00)×10 9/L and 73.50(69.70, 83.00) mmHg(1 mmHg=0.133 kPa), respectively, which were all lower than those in the non-severe group (1.42(1.09, 1.95)×10 9/L, 187.00(148.00, 230.00)×10 9/L and 96.00(83.20, 108.00) mmHg, respectively). The differences were all statistically significant ( Z=5.59, 2.00 and 5.00, respectively, all P<0.05). The levels of creatine kinase (CK), aspartate aminotransferase (AST), lactate dehydrogenase (LDH), C reaction protein (CRP) and procalcitonin (PCT) in the severe group were 123.00(79.00, 212.00) U/L, 32.10(27.00, 47.40) U/L, 305.50(216.00, 396.00) U/L, 37.02(23.92, 63.66) mg/L and 0.09(0.05, 0.19) μg/L, respectively, which were all higher than those in the non-severe group (68.00(48.00, 103.00) U/L, 20.10(16.70, 26.20) U/L, 179.00(150.00, 222.00) U/L, 26.55(18.11, 36.96) mg/L and 0.04(0.03, 0.06) μg/L respectively), and the differences were all statistically significant ( Z=3.89, 5.60, 5.12, 2.85 and 5.43, respectively, all P<0.01). No significant differences were observed in white blood cell count, creatine kinase isoenzyme and blood lactate between the two groups ( Z=1.53, 0.41 and 1.00, respectively, all P>0.05). Conclusion:Gender, age, LYM count, PLT count, PaO 2, CK, AST, LDH, CRP and PCT could be used to provide reference for clinical classification of COVID-19 patients.

Objective:To retrospective analyze the epidemiology, clinical characteristics, treatment and prognosis in patients with coronavirus disease 2019 (COVID-19).Methods:A total of 278 patients with COVID-19 admitted to Guangzhou Eighth People′s Hospital from January 20 to February 10, 2020 were selected. The general demographic data, epidemiological data, clinical symptoms, laboratory examinations, lung CT imaging, treatment and prognosis were analyzed.Results:There were 130 male patients (46.8%) and 148 females (53.2%) with age (48.1±17.0) years and 88.8% patients between 20-69 years. Two hundred and thirty-six (84.9%) patients had comorbidities. Two hundred and eleven cases (75.9%) were common type. The in-hospital mortality was 0.4% (1/278). The majority (201, 72.3%) were imported cases mainly from Wuhan (89, 44.3%). The most common clinical manifestations were fever (70.9%) and dry cough (61.5%). In some patients, hemoglobin (10.4%), platelets (12.6%) and albumin (55.4%) were lower than the normal range. Other biochemical tests according to liver and function were normal, while lactic dehydrogenase (LDH) was elevated in 61 patients (21.9%), creatine kinase increased in 26 patients (9.4%). Prolonged activated partial thromboplastin time (APTT) was seen in 52 patients (18.7%), D-dimer higher than normal in 140 patients (50.4%), while 117 patients (42.1%) had elevated high-sensitivity C-reactive protein. Typical CT manifestations included single or multiple ground glass shadows especially in lung periphery in early disease which infiltrated and enlarged during progressive stage. Diffuse consolidation with multiple patchy density in severe/critical cases and even "white lung" presented in a few patients. Two hundred and forty-two patients (87.1%) received one or more antiviral agents, 242 (87.1%) combined with antibacterials, 191 (68.7%) with oxygen therapy. There were 198 patients (71.2%) treated with traditional Chinese medicine.Conclusions:COVID-19 could attack patients in all ages with majority of common type and low mortality rate. Clinical manifestations involve multiple organs or systems. Progression of the disease results in critical status which should be paid much attention.

OBJECTIVETo compare the effects on joint dysfunction after meniscal suture surgery between rehabilitation training combined with modified-acupuncture and simple rehabilitation training.

METHODSSeventy-one patients with meniscal suture surgery were randomized into an observation group (=36) and a control group (=35). Patients in the observation group received modified-acupuncture combined with rehabilitation training. Acupuncture for 8 weeks were at Zutonggu (BL 65), Shugu (BL 66), Neiting (ST 44), Xiangu (ST 43), Xiaxi (GB 43), Zulinqi (GB 41), Dadu (SP 2), Taibai (SP 3), Xingjian (LR 2), and Taichong (LR 3), once a day for continuous 6 days with 1 day for rest. Patients in the control group received simple rehabilitation training for continuous 8 weeks. The training included quadriceps femoris, range of knee joint motion and motion and limb walking on the affected side. The effect score for meniscus injury after treatment from Japanese Orthopaedics Association (JOA) and visual analogue scale (VAS) score were recorded before and after treatment. The effects were compared in the two groups.

RESULTSAfter treatment, the VAS and JOA scores were improved in the two groups (all<0.05), with better results in the observation group (both<0.05). The effective rate was 91.7% (33/36) in the observation group, which was better than 80.0% (28/35) in the control group (<0.05).

CONCLUSIONRehabilitation training combined with-acupuncture achieve better effect than simple rehabilitation training for joint dysfunction after meniscal suture surgery.