Objective:To learn about both the distribution of resources of radiodiagnostic and radiotherapeutic and the frequencies of radiological examinations to provide a basis for rational allocation of medical resources and standardize medical ionizing radiation.Methods:Based on the data on permanent resident population and the data reported by the Suzhou medical institutions in possesion of radiological equipment to the " Suzhou radiological health information management platform", a summary was made of the number of items of radiological equipment and the frequencies of radiological examinations in Suzhou medical institutions in 2022 and 2023.Results:In 2023, there were 368 medical institutions with radiological equipment in Suzhou, including 28 tertiary hospitals, 58 secondary hospitals, 159 primary hospitals and 123 unrated others. The total number of the items of radiological equipment was 1 688, with 39 items more than in 2022, about 1.30 units per 10 000 population. There were 5 187 medical radiation workers in total, with 339 more than in 2022. The frequencies of radiological procedures were 1 157.961/per thousand population, with 37.70% being from computed tomography in 2023.Conclusions:The number of items of radiodiagnostic and radiotherapeutic equipment and the frequencies of radiological procedures was at a relatively high level in China, but the distribution of medical resources were in a unbanlanced state. Efforts should be focused on optimization of the allocation of medical resources for the sake of reducing the public radiation dose and protecting public health.

Objective:To generate a chronic lymphocytic leukemia (CLL) mouse model with intact immune competence and short latency by adoptively transferring (AT) splenocytes from immunoglobulin heavy-chain enhancer-driven T-cell leukemia/lymphoma 1 (Eμ-TCL1) transgenic donors into wild-type (WT) recipients.Methods:Specific pathogen-free C57BL/6J WT mice and H11-Eμ-VH-TCL1-β-globin-PolyA knock-in mice were utilized. The H11-Eμ-VH-TCL1-β-globin-PolyA knock-in mice were generated using CRISPR/Cas9 technology, and their genotypes were confirmed by PCR. Experimental animals were randomly divided into an adoptive transfer (AT) group and a WT control group ( n=10 per group). Mice in the AT group received an intraperitoneal injection of splenocytes from H11-Eμ-VH-TCL1-β-globin-PolyA knock-in mice. The weight and general condition of the mice were monitored. Mice were euthanized by cervical dislocation at 9 weeks post-transplantation. The CLL model was validated using key indicators, including pathological manifestations, changes in peripheral blood leukocyte counts, and immunophenotype. Results:AT group mice exhibited significantly increased spleen weight [ (0.92±0.16) g vs (0.06±0.01) g in WT group, P<0.05] and liver weight [ (2.11±0.56) g vs (1.42±0.13) g in WT group, P=0.006], indicative of marked splenomegaly and hepatomegaly. The peripheral blood leukocyte count was significantly higher in the AT group [ (124.33±8.74) ×10 9/L] compared to the WT group [ (5.55±1.67) ×10 9/L] ( P=0.002). Similarly, the percentage of peripheral blood B lymphocytes was markedly increased in the AT group versus the WT group [ (69.13±6.88) % vs (39.78±5.94) %, P<0.05]. Histopathological examination revealed CLL manifestations in the spleen, lymph nodes, and bone marrow of AT group mice, with significant lymphocytic infiltration observed in the liver, lung, and kidney tissues. Flow cytometry analysis showed that the percentages of CD19 +CD5 + B lymphocytes among total lymphocytes in peripheral blood, bone marrow, and spleen of the AT group were (61.37±9.92) %, (28.61± 7.08) %, and (86.03±5.78) %, respectively. These were significantly higher (all P<0.05) than in the WT group [ (4.51±1.32) %, (5.58±1.46) %, and (14.33±3.20) %]. Furthermore, these CLL-like cells in the AT group were positive for CD43 and CD200, but showed lower expression of CD20, CD22, and CD79b compared to WT B cells. Conclusion:Adoptive transfer of splenocytes from Eμ-TCL1 transgenic mice successfully established a CLL mouse model with a relatively short latency period. This model represents a valuable preclinical tool for investigating CLL and related pathologies.

Objective:To analyze the impact of occupational health management assistance for small and micro enterprises in Suzhou on employers, exploring the assistance model for occupational health management in small and micro enterprises.Methods:From 2020 to 2022, a total of 318 small and micro enterprises with serious occupational disease hazards, weak occupational health management, and strong subjective improvement were selected as assistance objects annually by means of territorial recommendation and active registration of employers. The basic information of the enterprise and the status of occupational health management were obtained by means of questionnaire survey, archives review, workplace field investigation and occupational disease hazard factors detection. Pearson χ2 test was used to analyze the changes of occupational health management before and after helping enterprises. Results:The small and micro enterprises receiving assistance were mainly private enterprises (51.26%, 163/318) and limited liability companies (27.99%, 89/318). The occupational health training rates for enterprise leaders, management personnel, and workers increased from 77.36% (246/318), 82.08% (261/318) and 72.44% (4554/6287) before assistance to 90.57% (288/318), 95.28% (303/318) and 94.40% (5905/6255), the differences were statistically significant ( χ2=20.60, 27.63, 1092.67, all P<0.001). After the assistance, the distribution and wearing of personal protective equipment for workers, the detection of occupational hazard factors in the workplace and occupational health examination by enterprises increased by 3.34%, 18.39%, 13.21% and 15.10%, respectively. In terms of occupational health management, the comprehensive establishment rate of occupational health management system increased from 21.70% (69/318) before assistance to 64.47% (205/318). Compared with before assistance, the comprehensive notification rate/setting rate of warning signs and notification cards, labor contracts for occupational disease hazard positions, occupational health bulletin boards, and occupational health examination results were significantly increased after assistance ( χ2=120.08, 77.40, 149.18, 86.76, all P<0.001) . Conclusion:Suzhou adopts a model led by the health administrative department and supported by technical support from service institutions to assist small and micro enterprises, resulting in a significant improvement in the occupational health management level of small and micro enterprises.

Objective:To analyze the impact of occupational health management assistance for small and micro enterprises in Suzhou on employers, exploring the assistance model for occupational health management in small and micro enterprises.Methods:From 2020 to 2022, a total of 318 small and micro enterprises with serious occupational disease hazards, weak occupational health management, and strong subjective improvement were selected as assistance objects annually by means of territorial recommendation and active registration of employers. The basic information of the enterprise and the status of occupational health management were obtained by means of questionnaire survey, archives review, workplace field investigation and occupational disease hazard factors detection. Pearson χ2 test was used to analyze the changes of occupational health management before and after helping enterprises. Results:The small and micro enterprises receiving assistance were mainly private enterprises (51.26%, 163/318) and limited liability companies (27.99%, 89/318). The occupational health training rates for enterprise leaders, management personnel, and workers increased from 77.36% (246/318), 82.08% (261/318) and 72.44% (4554/6287) before assistance to 90.57% (288/318), 95.28% (303/318) and 94.40% (5905/6255), the differences were statistically significant ( χ2=20.60, 27.63, 1092.67, all P<0.001). After the assistance, the distribution and wearing of personal protective equipment for workers, the detection of occupational hazard factors in the workplace and occupational health examination by enterprises increased by 3.34%, 18.39%, 13.21% and 15.10%, respectively. In terms of occupational health management, the comprehensive establishment rate of occupational health management system increased from 21.70% (69/318) before assistance to 64.47% (205/318). Compared with before assistance, the comprehensive notification rate/setting rate of warning signs and notification cards, labor contracts for occupational disease hazard positions, occupational health bulletin boards, and occupational health examination results were significantly increased after assistance ( χ2=120.08, 77.40, 149.18, 86.76, all P<0.001) . Conclusion:Suzhou adopts a model led by the health administrative department and supported by technical support from service institutions to assist small and micro enterprises, resulting in a significant improvement in the occupational health management level of small and micro enterprises.

Objective To investigate the differences of type 2 innate lymphocytes (ILC2) and interlukin 9 (IL-9) between chronic lymphocytic leukemia (CLL) patients and healthy controls, and to understand the effects of ILC2 on the function of regulatory T cells (Tregs), CD8⁺ T cells and CLL cells through IL-9. Methods Flow cytometry was used to detect the levels of ILC2 and Tregs in the peripheral blood of 45 newly diagnosed CLL patients and 24 healthy controls, and the expressions of granzyme B and perforin in CD8⁺ T cells in the peripheral blood of 28 patients and 15 healthy controls; ELISA was used to detect the level of IL-9 in the serum. ILC2 of patients and healthy controls was sorted by immunomagnetic beads and cultured separately, and the level of IL-9 in the culture supernatant was measured by ELISA. ILC2 sorted from CLL patients and healthy control-derived peripheral blood mononuclear cells(PBMCs) were co-cultured with the B cell leukemia MEC-1 cells, one group was supplemented with IL-9 antibody and the other group was not. After 72 hours of culture, the ratio of Tregs, programmed death 1 (PD-1), T cell immunoglobulin and immunoreceptor tyrosine-based inhibitory motif domain (TIGIT), cytotoxic T lymphocyte antigen 4 (CTLA-4) on Tregs, granzyme B and perforin in CD8⁺ T cells were measured by flow cytometry, IL-9 level of the culture supernatant was measured by ELISA, the apoptosis of MEC-1 cells was measured by Annexin V-PI. Results Compared with the healthy control group, the levels of ILC2, Tregs and IL-9 in the CLL group increased significantly. The levels of granzyme B and perforin in CD8⁺ T cells were positively correlated in the peripheral blood of CLL patients. Compared with the healthy control group, IL-9 levels in the supernatant of sorted ILC2 from CLL patients increased. In the anti-IL9 antibody group, the level of PD-1 and TIGIT on Tregs decreased, and the level of granzyme B in CD8⁺ T cells increased significantly. The level of IL-9 in the anti-IL9 antibody group decreased statistically. And MEC-1 cells showed increased early apoptotic rate in the anti-IL9 antibody group statistically. Conclusion In CLL, ILC2 affects CD8⁺ T cells and Tregs through IL-9, which weakens the anti-tumor effect of CD8⁺ T cells, enhances the immunosuppressive effect of Tregs, and plays a role in the occurrence and development of CLL disease.
Humans ; Leukemia, Lymphocytic, Chronic, B-Cell/immunology* ; CD8-Positive T-Lymphocytes/immunology* ; T-Lymphocytes, Regulatory/immunology* ; Middle Aged ; Male ; Female ; Interleukin-9/blood* ; Aged ; Granzymes/metabolism* ; Perforin/metabolism* ; Immunity, Innate ; Adult ; Lymphocytes/immunology*

Objective:To investigate effect of rapamycin on proliferation of human chronic lymphoblastic leukemia tumor cell MEC-1 in vitro.Methods:Human γδT cells were cultured and expanded in vitro.Human γδT cells percentage was detected by flow cytometry on the 10th day.γδT cells were treated with different concentrations of rapamycin(0,50,100 and 200 nmol/L).After 48 h of intervention,IL-17,IL-12,IFN-γ and TNF-α contents secreted by γδT cells were determined by ELISA,and AKT/mTOR protein expression was detected by Western blot.Supernatant of γδT was collected and co-cultured with MEC-1 indirectly.Co-cultured experi-mental was divided into DMSO group,rapamycin group,γδT group,rapamycin treated γδT group and control group.Survival rate of MEC-1 cells in each group was determined by CCK-8 after 48 h of culture.Results:IL-12,IFN-γ and TNF-α levels secreted by γδT cells were the highest when rapamycin was 100 nmol/L,which was significantly higher than other groups(P<0.05).When rapamycin was 50 nmol/L,IL-17 secretion level of γδT cells was the highest,and IL-17 level secreted by γδT cells gradually decreased with increase of rapamycin concentration.Survival rates of MEC-1 cells in supernatant of DMSO group,rapamycin group,rapamycin treated γδT cell group and γδT cell group were(93.48±2.52)%,(71.44±4.31)%,(83.93±1.54)%and(57.97±2.47)%,whose differences were statistically significant compared with control group(P<0.05).Compared with control group,mTOR protein level of γδT cells was decreased in all rapamycin treated groups.Protein expressions of upstream AKT,pAKT and downstream specific transcription factor 4EBP-1 were decreased with increase of rapamycin concentration(P<0.05).Conclusion:There is a dose-effect relationship between rapamycin concentration and IL-17,IL-12,IFN-γ,TNF-α secretions by γδT cells.Rapamycin and γδT cells can inhibit pro-liferation of MEC-1 cells,and 100 nmol/L rapamycin can enhance inhibitory effect of γδT cells on proliferation of MEC-1 cells.Rapa-mycin can weaken AKT pathway on γδT cells,and rapamycin combined with γδT cells plays a positive role in anti-tumor application of leukemia.

Objective:To generate a chronic lymphocytic leukemia (CLL) mouse model with intact immune competence and short latency by adoptively transferring (AT) splenocytes from immunoglobulin heavy-chain enhancer-driven T-cell leukemia/lymphoma 1 (Eμ-TCL1) transgenic donors into wild-type (WT) recipients.Methods:Specific pathogen-free C57BL/6J WT mice and H11-Eμ-VH-TCL1-β-globin-PolyA knock-in mice were utilized. The H11-Eμ-VH-TCL1-β-globin-PolyA knock-in mice were generated using CRISPR/Cas9 technology, and their genotypes were confirmed by PCR. Experimental animals were randomly divided into an adoptive transfer (AT) group and a WT control group ( n=10 per group). Mice in the AT group received an intraperitoneal injection of splenocytes from H11-Eμ-VH-TCL1-β-globin-PolyA knock-in mice. The weight and general condition of the mice were monitored. Mice were euthanized by cervical dislocation at 9 weeks post-transplantation. The CLL model was validated using key indicators, including pathological manifestations, changes in peripheral blood leukocyte counts, and immunophenotype. Results:AT group mice exhibited significantly increased spleen weight [ (0.92±0.16) g vs (0.06±0.01) g in WT group, P<0.05] and liver weight [ (2.11±0.56) g vs (1.42±0.13) g in WT group, P=0.006], indicative of marked splenomegaly and hepatomegaly. The peripheral blood leukocyte count was significantly higher in the AT group [ (124.33±8.74) ×10 9/L] compared to the WT group [ (5.55±1.67) ×10 9/L] ( P=0.002). Similarly, the percentage of peripheral blood B lymphocytes was markedly increased in the AT group versus the WT group [ (69.13±6.88) % vs (39.78±5.94) %, P<0.05]. Histopathological examination revealed CLL manifestations in the spleen, lymph nodes, and bone marrow of AT group mice, with significant lymphocytic infiltration observed in the liver, lung, and kidney tissues. Flow cytometry analysis showed that the percentages of CD19 +CD5 + B lymphocytes among total lymphocytes in peripheral blood, bone marrow, and spleen of the AT group were (61.37±9.92) %, (28.61± 7.08) %, and (86.03±5.78) %, respectively. These were significantly higher (all P<0.05) than in the WT group [ (4.51±1.32) %, (5.58±1.46) %, and (14.33±3.20) %]. Furthermore, these CLL-like cells in the AT group were positive for CD43 and CD200, but showed lower expression of CD20, CD22, and CD79b compared to WT B cells. Conclusion:Adoptive transfer of splenocytes from Eμ-TCL1 transgenic mice successfully established a CLL mouse model with a relatively short latency period. This model represents a valuable preclinical tool for investigating CLL and related pathologies.

Objective:To investigate effect of rapamycin on proliferation of human chronic lymphoblastic leukemia tumor cell MEC-1 in vitro.Methods:Human γδT cells were cultured and expanded in vitro.Human γδT cells percentage was detected by flow cytometry on the 10th day.γδT cells were treated with different concentrations of rapamycin(0,50,100 and 200 nmol/L).After 48 h of intervention,IL-17,IL-12,IFN-γ and TNF-α contents secreted by γδT cells were determined by ELISA,and AKT/mTOR protein expression was detected by Western blot.Supernatant of γδT was collected and co-cultured with MEC-1 indirectly.Co-cultured experi-mental was divided into DMSO group,rapamycin group,γδT group,rapamycin treated γδT group and control group.Survival rate of MEC-1 cells in each group was determined by CCK-8 after 48 h of culture.Results:IL-12,IFN-γ and TNF-α levels secreted by γδT cells were the highest when rapamycin was 100 nmol/L,which was significantly higher than other groups(P<0.05).When rapamycin was 50 nmol/L,IL-17 secretion level of γδT cells was the highest,and IL-17 level secreted by γδT cells gradually decreased with increase of rapamycin concentration.Survival rates of MEC-1 cells in supernatant of DMSO group,rapamycin group,rapamycin treated γδT cell group and γδT cell group were(93.48±2.52)%,(71.44±4.31)%,(83.93±1.54)%and(57.97±2.47)%,whose differences were statistically significant compared with control group(P<0.05).Compared with control group,mTOR protein level of γδT cells was decreased in all rapamycin treated groups.Protein expressions of upstream AKT,pAKT and downstream specific transcription factor 4EBP-1 were decreased with increase of rapamycin concentration(P<0.05).Conclusion:There is a dose-effect relationship between rapamycin concentration and IL-17,IL-12,IFN-γ,TNF-α secretions by γδT cells.Rapamycin and γδT cells can inhibit pro-liferation of MEC-1 cells,and 100 nmol/L rapamycin can enhance inhibitory effect of γδT cells on proliferation of MEC-1 cells.Rapa-mycin can weaken AKT pathway on γδT cells,and rapamycin combined with γδT cells plays a positive role in anti-tumor application of leukemia.

Objective:To learn about both the distribution of resources of radiodiagnostic and radiotherapeutic and the frequencies of radiological examinations to provide a basis for rational allocation of medical resources and standardize medical ionizing radiation.Methods:Based on the data on permanent resident population and the data reported by the Suzhou medical institutions in possesion of radiological equipment to the " Suzhou radiological health information management platform", a summary was made of the number of items of radiological equipment and the frequencies of radiological examinations in Suzhou medical institutions in 2022 and 2023.Results:In 2023, there were 368 medical institutions with radiological equipment in Suzhou, including 28 tertiary hospitals, 58 secondary hospitals, 159 primary hospitals and 123 unrated others. The total number of the items of radiological equipment was 1 688, with 39 items more than in 2022, about 1.30 units per 10 000 population. There were 5 187 medical radiation workers in total, with 339 more than in 2022. The frequencies of radiological procedures were 1 157.961/per thousand population, with 37.70% being from computed tomography in 2023.Conclusions:The number of items of radiodiagnostic and radiotherapeutic equipment and the frequencies of radiological procedures was at a relatively high level in China, but the distribution of medical resources were in a unbanlanced state. Efforts should be focused on optimization of the allocation of medical resources for the sake of reducing the public radiation dose and protecting public health.

Objective: To examine the mediating effect of nighttime sleep duration on pain and frailty among elderly patients with comorbidity of chronic diseases, so as to provide insights into frailty control among the elderly. Methods: Demographic information, pain and nighttime sleep duration of the elderly at ages of 60 years and older were collected from the China Health and Retirement Longitudinal Study 2020. Frailty were evaluated using frailty index. The mediating effect of sleep duration for pain and frailty was analyzed using the Process program compiled by HAYSS and colleagues, and the significance of the mediating role was tested using the Bootstrap test. Results: A total of 2 246 elderly patients with comorbidity of chronic diseases were enrolled, including 1 195 males (53.21%) and 1 051 females (46.79%), with a median age of 65.00 (interquartile range, 8.00) years. There were 504 cases with frailty (22.44%), with a median pain score of 0 (interquartile range, 1.00) points, and a mean nighttime sleep duration of (6.44±1.55) hours. Mediating analysis showed that pain affected frailty directly and positively with the effect value of 0.089 (95%CI: 0.066-0.112), and also affected frailty by nighttime sleep duration directly and positively with the effect value of 0.047 (95%CI: 0.036-0.058), with the mediating effect contributed 34.56% of the total effect. Conclusion Pain can directly or indirectly affect frailty among elderly patients with comorbidity of chronic diseases through nighttime sleep duration.