1.Protective Effect of Taohong Siwutang on Cerebral Ischemia-reperfusion Injury Based on A1/A2 Phenotype Transformation of Astrocytes Mediated by JAK2/STAT3 Pathway
Huifang WANG ; Xinru CHEN ; Mengyuan CHEN ; Xian ZHOU ; Lan HAN ; Weidong CHEN ; Zhaojie JI
Chinese Journal of Experimental Traditional Medical Formulae 2025;31(7):25-34
ObjectiveTo investigate whether the effect of Taohong Siwutang on cerebral ischemia-reperfusion (CIRI) injury in rats is related to the regulation of astrocyte polarization and explore the related mechanism. MethodsEighty-four male SD rats were randomly assigned to the following groups: A sham operation group, a model group, Taohong Siwutang treatment groups (low dose, medium dose, and high dose), ligustrazine phosphate tablet (LPT) group, and AG490 group. All groups, except for the sham operation group, underwent middle cerebral artery occlusion/reperfusion (MCAO/R) modeling and were treated for seven days. The neurological impairment was evaluated using the Longa score. The volume of cerebral infarction was assessed through 2,3,5-triphenyltetrazolium chloride (TTC) staining. Real-time fluorescent quantitative polymerase chain reaction (Real-time PCR) and Western blot analyses were performed to analyze the mRNA and protein expression levels of cortical complement 3 (C3), S100 calcium-binding protein A10 (S100A10), Janus kinase 2 (JAK2), and signal transducer and activator of transcription 3 (STAT3). Additionally, protein expression levels of vascular endothelial growth factor-A (VEGF-A) were assessed, and the mRNA expression levels of inflammatory factors, including interleukin-6 (IL-6), interleukin-1β (IL-1β), and tumor necrosis factor-α (TNF-α), were evaluated. Glial fibrillary acidic protein (GFAP) and C3, S100A10 and Co-localization was detected via immunofluorescence double staining. Lastly, VEGF expression levels were measured using enzyme-linked immunosorbent assay (ELISA). ResultsCompared with the sham operation group, the model group showed a significant increase in cerebral infarction volume and neurological impairment (P<0.01). C3 protein levels were elevated, while S100A10 levels were decreased. Pathway-related markers were significantly upregulated (P<0.05, P<0.01), and VEGF-A protein levels were significantly reduced (P<0.01). The mRNA expression of inflammatory factors was significantly upregulated (P<0.01). Co-localization analysis showed significantly increased GFAP and C3 fluorescence intensity (P<0.01) and greatly decreased GFAP and S100A10 fluorescence intensity (P<0.01). Additionally, VEGF content was significantly elevated (P<0.01). Compared with the model group, medium- and high-dose Taohong Siwutang and LPT groups exhibited a significant reduction in cerebral infarction volume and neurological impairment (P<0.01). Groups treated with low, medium, and high doses of Taohong Siwutang and LPT group exhibited a decrease in C3 protein expression levels and an increase in S100A10 expression levels (P<0.01). In the high-dose Taohong Siwutang and AG490 groups, both protein and mRNA expression of C3 and pathway-related markers were significantly downregulated (P<0.05, P<0.01), while S100A10 expression and VEGF-A protein levels were significantly increased (P<0.01). Additionally, the mRNA expression levels of inflammatory factors were significantly reduced (P<0.01). The co-localization fluorescence intensity of GFAP and C3 significantly decreased (P<0.01), while that of GFAP and S100A10 greatly increased (P<0.01). Furthermore, VEGF content exhibited a marked elevation (P<0.01). ConclusionTaohong Siwutang exerts a protective effect in rats with cerebral CIRI injury. The underlying mechanism is associated with the downregulation of the JAK2/STAT3 signaling pathway, promotion of A2-type astrocyte polarization, reduction of inflammatory factor release, and enhancement of VEGF production.
2.Protective Effect of Taohong Siwutang on Cerebral Ischemia-reperfusion Injury Based on A1/A2 Phenotype Transformation of Astrocytes Mediated by JAK2/STAT3 Pathway
Huifang WANG ; Xinru CHEN ; Mengyuan CHEN ; Xian ZHOU ; Lan HAN ; Weidong CHEN ; Zhaojie JI
Chinese Journal of Experimental Traditional Medical Formulae 2025;31(7):25-34
ObjectiveTo investigate whether the effect of Taohong Siwutang on cerebral ischemia-reperfusion (CIRI) injury in rats is related to the regulation of astrocyte polarization and explore the related mechanism. MethodsEighty-four male SD rats were randomly assigned to the following groups: A sham operation group, a model group, Taohong Siwutang treatment groups (low dose, medium dose, and high dose), ligustrazine phosphate tablet (LPT) group, and AG490 group. All groups, except for the sham operation group, underwent middle cerebral artery occlusion/reperfusion (MCAO/R) modeling and were treated for seven days. The neurological impairment was evaluated using the Longa score. The volume of cerebral infarction was assessed through 2,3,5-triphenyltetrazolium chloride (TTC) staining. Real-time fluorescent quantitative polymerase chain reaction (Real-time PCR) and Western blot analyses were performed to analyze the mRNA and protein expression levels of cortical complement 3 (C3), S100 calcium-binding protein A10 (S100A10), Janus kinase 2 (JAK2), and signal transducer and activator of transcription 3 (STAT3). Additionally, protein expression levels of vascular endothelial growth factor-A (VEGF-A) were assessed, and the mRNA expression levels of inflammatory factors, including interleukin-6 (IL-6), interleukin-1β (IL-1β), and tumor necrosis factor-α (TNF-α), were evaluated. Glial fibrillary acidic protein (GFAP) and C3, S100A10 and Co-localization was detected via immunofluorescence double staining. Lastly, VEGF expression levels were measured using enzyme-linked immunosorbent assay (ELISA). ResultsCompared with the sham operation group, the model group showed a significant increase in cerebral infarction volume and neurological impairment (P<0.01). C3 protein levels were elevated, while S100A10 levels were decreased. Pathway-related markers were significantly upregulated (P<0.05, P<0.01), and VEGF-A protein levels were significantly reduced (P<0.01). The mRNA expression of inflammatory factors was significantly upregulated (P<0.01). Co-localization analysis showed significantly increased GFAP and C3 fluorescence intensity (P<0.01) and greatly decreased GFAP and S100A10 fluorescence intensity (P<0.01). Additionally, VEGF content was significantly elevated (P<0.01). Compared with the model group, medium- and high-dose Taohong Siwutang and LPT groups exhibited a significant reduction in cerebral infarction volume and neurological impairment (P<0.01). Groups treated with low, medium, and high doses of Taohong Siwutang and LPT group exhibited a decrease in C3 protein expression levels and an increase in S100A10 expression levels (P<0.01). In the high-dose Taohong Siwutang and AG490 groups, both protein and mRNA expression of C3 and pathway-related markers were significantly downregulated (P<0.05, P<0.01), while S100A10 expression and VEGF-A protein levels were significantly increased (P<0.01). Additionally, the mRNA expression levels of inflammatory factors were significantly reduced (P<0.01). The co-localization fluorescence intensity of GFAP and C3 significantly decreased (P<0.01), while that of GFAP and S100A10 greatly increased (P<0.01). Furthermore, VEGF content exhibited a marked elevation (P<0.01). ConclusionTaohong Siwutang exerts a protective effect in rats with cerebral CIRI injury. The underlying mechanism is associated with the downregulation of the JAK2/STAT3 signaling pathway, promotion of A2-type astrocyte polarization, reduction of inflammatory factor release, and enhancement of VEGF production.
3.Study on Differential DNA Methylation Profiles of Patients with High-Altitude Polycythemia.
Jun-Hua JI ; Min YANG ; Yan JIANG ; Ting-Xian YANG ; Xiao-Jing MA ; Qi-Chao YIN ; Hong-Wei YIN ; Lin-Hua JI
Journal of Experimental Hematology 2025;33(2):580-586
OBJECTIVE:
To investigate the whole-genome differential methylation profile of patients with high-altitude polycythemia (HAPC).
METHODS:
In this study, a total of 20 adult male patients with HAPC were included, including 10 Tibetan and 10 Han patients. The control group consisted of 20 healthy adult males, including 10 Tibetan and 10 Han patients. Peripheral blood was collected from each group for DNA extraction and quality inspection, and DNA libraries were constructed. The differential methylation regions (DMRs) between groups were detected using reduced representation bisulfite sequencing, with enriched regions compared to those of the control group. The differential enrichment regions were selected, and the intersection of the enriched regions was associated with genes. The methylation enrichment regions that differed significantly between groups were filtered based on the number of enriched samples in the enriched regions between the groups. GO, KEGG functional, and pathway analysis were performed on the differentially associated gene sets to reveal significant differences between the patients and control groups at the functional and pathway levels.
RESULTS:
In comparison with the control group, 17 152 sites with more than 25% difference and 15 558 sites with less than -25% difference were identified in Tibetan patients. The top 5 genes with the largest methylation differences between the two groups were MCCC2, RP3-399L15.3, ZNF621, RP11-394A14.2 and SLC39A10. The top significantly different pathways annotated in the differentially expressed genes pathway was serotonergic synapse. In comparison with the control group, 2 687 CpG sites with a greater than 25% difference and 2 602 CpG sites with a less than -25% difference were identified in Han patients. The top 5 genes with the largest methylation differences between the two groups were NAA25, CORO2B, PDC, ZNF853, and MLLT10. The top significantly different pathways annotated in the differentially expressed genes pathway were glutamatergic synapse, retrograde endocannabinoid signaling, Rap1 signaling pathway and cholinergic synapse. In comparison with the control group, 3 895 CpG sites with a greater than 25% difference and 3 969 CpG sites with a less than -25% difference were identified in HAPC patients. The maximum methylation difference between the two groups could reach 78.1%, while the minimum was -42.6%. The top 5 genes with the largest methylation differences between the two groups were MCCC2, ARSJ, CTNNA3, SLC39A10, and SWAP70. The top significantly different pathways annotated in the differentially expressed genes pathway was signaling pathways regulating pluripotency of stem cells.
CONCLUSION
The occurrence of HAPC may be related to abnormal changes in DNA methylation, and methylation sites may be helpful for the early diagnosis of HAPC.
Humans
;
DNA Methylation
;
Altitude
;
Polycythemia/genetics*
;
Male
;
Adult
;
CpG Islands
4.Effect analysis of innovative model on perioperative pain management in prostate cancer patients with hematuria undergoing prostatic artery embolization.
Xin WANG ; Ji-Xian ZANG ; Xiao-Yang SU ; Chun-Meng PENG ; Sha-Sha LIU ; Ao-Mei LI
National Journal of Andrology 2025;31(8):728-731
OBJECTIVE:
To investigate the effect of innovative perioperative pain management on prostate cancer patients with hematuria undergoing prostatic artery embolization (PAE).
METHODS:
A total of 60 patients undergoing PAE in the Interventional Therapy Department of General Hospital of Eastern Theater Command from May 2024 to January 2025 were selected by convenience sampling method and randomly divided into the intervention group and the control group, with 30 patients in each group. The control group received traditional pain management of nursing. An innovative perioperative pain management was performed in intervention group including preoperative "body-mind-pain" holistic assessment and preparation, intraoperative humanistic care and real-time support, postoperative multimodal analgesia and rehabilitation, dynamic monitoring and closed-loop feedback. The pain degree after 6 hours, 1 day, 3 days and 1 week of the operation, and the quality of life after 1 week of operation, as well as nursing satisfaction at discharge were compared between the two groups.
RESULTS:
The VAS scores of the intervention group were significantly lower than those of the control group after 6 hours, 1 day, 3 days and 1 week of operation (P<0.05). One week after the operation, the quality of life in the observation group was higher than that of the control group significantly (P<0.05). The nursing satisfaction of the observation group was significantly higher than that of the control group at discharge(P<0.05).
CONCLUSION
The application of innovative perioperative pain management can alleviate pain of patients with PAE, which improves the quality of life and nursing satisfaction of patients, and is conducive to the rehabilitation of patients.
Humans
;
Male
;
Embolization, Therapeutic
;
Hematuria/therapy*
;
Prostatic Neoplasms/surgery*
;
Pain Management/methods*
;
Quality of Life
;
Prostate/blood supply*
;
Perioperative Care
;
Pain, Postoperative
;
Middle Aged
;
Aged
;
Pain Measurement
5.Application of mindfulness-based stress reduction on the patients treated with image fusion-guided prostate biopsy.
Qiang JI ; Jun HU ; Xiao-Hong WANG ; Yun LI ; Fan WANG ; Jie LIU ; Hui-Xian WEI ; Ying-Chun HUANG ; Ying LI
National Journal of Andrology 2025;31(9):812-817
OBJECTIVE:
To evaluate the application effect of mindfulness-based stress reduction (MBSR) therapy on the patients treated with image fusion-guided transperineal prostate biopsy.
METHODS:
A total of 160 patients who underwent image fusion-guided transperineal prostate biopsy in the Urology Department from April 2023 to April 2024 were included. Patients were randomly assigned to a control group and an observation group, with 80 cases in each group. The control group received routine care, while the observation group received combined MBSR on the basis of routine care. The surgical indicators, pain levels, psychological states, nursing satisfaction, and postoperative complication rates of both groups were compared.
RESULTS:
There was no statistically significant difference in general personal information and clinical data between the two groups(P>0.05). The surgery duration, secondary fusion rate, and postoperative complication rate in the observation group were all lower than those in the control group ([23.54±2.07]min vs [26.25±1.69]min, P<0.05; 8.75% vs 22.50%, P=0.017; 17% vs 29%, P=0.036), and nursing satisfaction was higher in the observation group than in the control group ( 77% vs 69%, P=0.025). The VAS scores biopsy (5.11±0.93 vs 6.27±1.32, P=0.041), discharge (0.74±0.67 vs 1.85±0.95, P=0.004), and scores of SDS (47.76±2.06 vs 50.46±2.07, P=0.009) and SAS (46.89±2.68 vs 49.75±2.83, P=0.031) in the observation group were all lower than those in the control group.
CONCLUSION
The application of MBSR in image fusion-guided prostate biopsy can synergistically utilize the advantages of minimally invasive technology, significantly optimize surgical indicators, and improve patients' psychological experiences, which is worthy of clinical application and promotion.
Humans
;
Male
;
Mindfulness
;
Prostate/pathology*
;
Image-Guided Biopsy
;
Stress, Psychological/therapy*
;
Middle Aged
;
Prostatic Neoplasms/pathology*
;
Aged
6.Effectiveness of Lianhua Qingwen Granule and Jingyin Gubiao Prescription in Omicron BA.2 Infection and Hospitalization: A Real-World Study of 56,244 Cases in Shanghai, China.
Yu-Jie ZHANG ; Guo-Jian LIU ; Han ZHANG ; Chen LIU ; Zhi-Qiang CHEN ; Ji-Shu XIAN ; Da-Li SONG ; Zhi LIU ; Xue YANG ; Ju WANG ; Zhe ZHANG ; Lu-Ying ZHANG ; Hua FENG ; Yan-Qi ZHANG ; Liang TAN
Chinese journal of integrative medicine 2025;31(1):11-18
OBJECTIVE:
To examine the effectiveness of Chinese medicine (CM) Lianhua Qingwen Granule (LHQW) and Jingyin Gubiao Prescription (JYGB) in asymptomatic or mild patients with Omicron infection in the shelter hospital.
METHODS:
This single-center retrospective cohort study was conducted in the largest shelter hospital in Shanghai, China, from April 10, 2022 to May 30, 2022. A total of 56,244 asymptomatic and mild Omicron cases were included and divided into 4 groups, i.e., non-administration group (23,702 cases), LHQW group (11,576 cases), JYGB group (12,112 cases), and dual combination of LHQW and JYGB group (8,854 cases). The length of stay (LOS) in the hospital was used to assess the effectiveness of LHQW and JYGB treatment on Omicron infection.
RESULTS:
Patients aged 41-60 years, with nadir threshold cycle (CT) value of N gene <25, or those fully vaccinated preferred to receive CM therapy. Before or after propensity score matching (PSM), the multiple linear regression showed that LHQW and JYGB treatment were independent influence factors of LOS (both P<0.001). After PSM, there were significant differences in LOS between the LHQW/JYGB combination and the other groups (P<0.01). The results of factorial design ANOVA proved that the LHQW/JYGB combination therapy synergistically shortened LOS (P=0.032).
CONCLUSIONS
Patients with a nadir CT value <25 were more likely to accept CM. The LHQW/JYGB combination therapy could shorten the LOS of Omicron-infected individuals in an isolated environment.
Humans
;
Drugs, Chinese Herbal/therapeutic use*
;
Male
;
Female
;
Middle Aged
;
Adult
;
China/epidemiology*
;
Hospitalization
;
COVID-19 Drug Treatment
;
COVID-19/epidemiology*
;
SARS-CoV-2
;
Retrospective Studies
;
Treatment Outcome
;
Length of Stay
;
Young Adult
;
Aged
7.A Novel Mouse Model Unveils Protein Deficiency in Truncated CDKL5 Mutations.
Xue FENG ; Zi-Ai ZHU ; Hong-Tao WANG ; Hui-Wen ZHOU ; Ji-Wei LIU ; Ya SHEN ; Yu-Xian ZHANG ; Zhi-Qi XIONG
Neuroscience Bulletin 2025;41(5):805-820
Mutations in the cyclin-dependent kinase-like 5 gene (CDKL5) cause a severe neurodevelopmental disorder, yet the impact of truncating mutations remains unclear. Here, we introduce the Cdkl5492stop mouse model, mimicking C-terminal truncating mutations in patients. 492stop/Y mice exhibit altered dendritic spine morphology and spontaneous seizure-like behaviors, alongside other behavioral deficits. After creating cell lines with various Cdkl5 truncating mutations, we found that these mutations are regulated by the nonsense-mediated RNA decay pathway. Most truncating mutations result in CDKL5 protein loss, leading to multiple disease phenotypes, and offering new insights into the pathogenesis of CDKL5 disorder.
Animals
;
Disease Models, Animal
;
Mice
;
Protein Serine-Threonine Kinases/deficiency*
;
Mutation/genetics*
;
Epileptic Syndromes/genetics*
;
Humans
;
Dendritic Spines/pathology*
;
Spasms, Infantile/genetics*
;
Male
;
Seizures/genetics*
;
Mice, Inbred C57BL
8.Advancements and applications in radiopharmaceutical therapy.
Shiya WANG ; Mingyi CAO ; Yifei CHEN ; Jingjing LIN ; Jiahao LI ; Xinyu WU ; Zhiyue DAI ; Yuhan PAN ; Xiao LIU ; Xian LIU ; Liang-Ting LIN ; Jianbing WU ; Ji LIU ; Qifeng ZHONG ; Zhenwei YUAN
Chinese Journal of Natural Medicines (English Ed.) 2025;23(6):641-657
Radiopharmaceuticals operate by combining radionuclides with carriers. The radiation energy emitted by radionuclides is utilized to selectively irradiate diseased tissues while minimizing damage to healthy tissues. In comparison to external beam radiation therapy, radionuclide drugs demonstrate research potential due to their biological targeting capabilities and reduced normal tissue toxicity. This article reviews the applications and research progress of radiopharmaceuticals in cancer treatment. Several key radionuclides are examined, including 223Ra, 90Y, Lutetium-177 (177Lu), 212Pb, and Actinium-225 (225Ac). It also explores the current development trends of radiopharmaceuticals, encompassing the introduction of novel radionuclides, advancements in imaging technologies, integrated diagnosis and treatment approaches, and equipment-medication combinations. We review the progress in the development of new treatments, such as neutron capture therapy, proton therapy, and heavy ion therapy. Furthermore, we examine the challenges and breakthroughs associated with the clinical translation of radiopharmaceuticals and provide recommendations for the research and development of novel radionuclide drugs.
Humans
;
Radiopharmaceuticals/therapeutic use*
;
Neoplasms/radiotherapy*
;
Radioisotopes/therapeutic use*
;
Animals
9.Clinical trial of brexpiprazole in the treatment of adults with acute schizophrenia
Shu-Zhe ZHOU ; Liang LI ; Dong YANG ; Jin-Guo ZHAI ; Tao JIANG ; Yu-Zhong SHI ; Bin WU ; Xiang-Ping WU ; Ke-Qing LI ; Tie-Bang LIU ; Jie LI ; Shi-You TANG ; Li-Li WANG ; Xue-Yi WANG ; Yun-Long TAN ; Qi LIU ; Uki MOTOMICHI ; Ming-Ji XIAN ; Hong-Yan ZHANG
The Chinese Journal of Clinical Pharmacology 2024;40(5):654-658
Objective To evaluate the efficacy and safety of brexpiprazole in treating acute schizophrenia.Methods Patients with schizophrenia were randomly divided into treatment group and control group.The treatment group was given brexpiprozole 2-4 mg·d-1 orally and the control group was given aripiprazole 10-20 mg·d-1orally,both were treated for 6 weeks.Clinical efficacy of the two groups,the response rate at endpoint,the changes from baseline to endpoint of Positive and Negative Syndrome Scale(PANSS),Clinical Global Impression-Improvement(CGI-S),Personal and Social Performance scale(PSP),PANSS Positive syndrome subscale,PANSS negative syndrome subscale were compared.The incidence of treatment-related adverse events in two groups were compared.Results There were 184 patients in treatment group and 186 patients in control group.After treatment,the response rates of treatment group and control group were 79.50%(140 cases/184 cases)and 82.40%(150 cases/186 cases),the scores of CGI-I of treatment group and control group were(2.00±1.20)and(1.90±1.01),with no significant difference(all P>0.05).From baseline to Week 6,the mean change of PANSS total score wese(-30.70±16.96)points in treatment group and(-32.20±17.00)points in control group,with no significant difference(P>0.05).The changes of CGI-S scores in treatment group and control group were(-2.00±1.27)and(-1.90±1.22)points,PSP scores were(18.80±14.77)and(19.20±14.55)points,PANSS positive syndrome scores were(-10.30±5.93)and(-10.80±5.81)points,PANSS negative syndrome scores were(-6.80±5.98)and(-7.30±5.15)points,with no significant difference(P>0.05).There was no significant difference in the incidence of treatment-related adverse events between the two group(69.00%vs.64.50%,P>0.05).Conclusion The non-inferiority of Brexpiprazole to aripiprazole was established,with comparable efficacy and acceptability.
10.Effect of delayed cleaning on cleaning and disinfection quality of gastro-scopes
Liu-Ji CHEN ; Jing ZHEN ; Yang-Yang ZHANG ; Zi-Yi HUANG ; Xian-Huang LI ; Xi HUANG ; Jiu-Hong MA
Chinese Journal of Infection Control 2024;23(6):725-730
Objective To evaluate the effect of delayed cleaning on the cleaning and disinfection quality of gastro-scopes after pre-treatment with different solutions.Methods According to the factorial design table,combination of the pre-treatment cleaning solutions(factor A)(including multi-enzyme cleaning solution[A1],clean water[A2])and delayed cleaning durations(factor B)(including 0 minutes after pre-treatment[B1],30 minutes after pre-treat-ment[B2],1 hour after pre-treatment[B3],and 3 hours after pre-treatment[B4])yielded eight groups(A1B1,A1B2,A1B3,A1B4,A2B1,A2B2,A2B3,A2B4).According to the usage order of gastroscopes,96 gastroscopes used in the digestive endoscopy center of a tertiary first-class hospital from May to September,2023 were randomly assigned to each group by random number table method,with 12 gastroscopes in each group.Specimens were taken at four time points:after pre-treatment,before cleaning,after cleaning,and after disinfection.Due to instant clea-ning,no specimen before cleaning were taken from A1B1 and A2B1 groups,thus only 3 specimens were taken from these two groups each.Four specimens were taken from gastroscopes in the rest groups,resulting in 360 specimens in total.The internal condition of the biopsy cavity was observed through a cavity detector during each delayed cleaning period after pre-treatment,and specimens were taken at the subsequent reprocessing processes of the gas-troscopes.The microbial conditions of the gastroscopes after pre-treatment,before cleaning,after cleaning,and af-ter disinfection were compared.Results After pre-treatment with multi-enzyme cleaning solution and clean water,there was no statistically significant difference in microbiological detection result(P>0.05).The biopsy cavity re-mained moist during the delayed cleaning period.There was no statistically significant difference in the microbial de-tection results of factors A and B before and after delayed cleaning as well as after disinfection(all P>0.05).There was no interaction effect between factor A and B.The distribution of bacterial colonies and disinfection qualified rate of gastroscopes after pre-treatment with two cleaning solutions were also not statistically different(both P>0.05).Conclusion Delayed cleaning for 30 minutes,1 hour,and 3 hours after pre-treatment does not affect the cleaning and disinfection quality of gastroscopes.When clinical demand is urgent,immediate cleaning should be carried out.However,a certain buffering time(no longer than 3 hours)before cleaning is acceptable,when cleaning and disin-fection workload is heavy and timely cleaning cannot be carried out.

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