[5-FU-Injured Bone Marrow Stromal Cells Initiate Stress-induced Premature Senescence of Hematopoietic Cells]

OBJECTIVE

To investigate the damage effect of 5-fluorouracil(5-FU) with tumor inhibition concentration on human bone marrow mesenchymal stem cells (hBMSC) and influence of its effect on the hematopoietic cells.

METHODS

The Cell Counting Kit-8 was used for determining the sensitivity of breast cancer cell line MCF-7, colon cancer cell line HCT-116 and HS-5 derived from human bone marrow stronal cell line to the different doses of 5-fluorouracil in vitro. After HS-5 was treated with 5-fluorouracil, crystal violet staining assay was used to count the number of colony forming unit-fibroblast, the distribution of cell cycle was analyzed by flow cytometry (FCM), apoptosis was assessed by Annexin V/PI double-stained method and Hoechest staining; DCFH-DA staining was used to analyse the level of reactive oxygen species (ROS), ELISA and immuofluorescence were used to detect cytokines KL, GM-CSF, RANTS and SDF. The hUCB-MNC was counted by trypan blue staining after co-culture with HS-5, FCM was used to detect the cell cycle distribution, ROS level and the ratio of CD34⁺ cells. The levels of glutathione peroxidase (GSH-Px) and total superoxide dismutase(T-SOD) were measured by enzymatic assay. The senescence associated-β-galactosidase (SA-β-Gal) staining was used to detect the senescent hUCB-MNC.

RESULTS

5-Fluorouracil of 12.5 µg/ml-100 µg/ml inhibited the proliferation of MCF-7, HCT-116 and HS-5 cells in dose-dependent and time-dependent manner, among them HS-5 was more sensitive to 5- fluorouracil. After treatment with 5-fluorouracil, the HS-5 cell cycle was blocked. The apoptosis rate and the intracellular ROS level of HS-5 significantly increased. Also HS-5-secreted hematopoietic growth factors decreased and inflammatory chemokines increased. After co-cultured with 5-fluorouracil-treated HS-5, the number of hUCB-MNC and the ratio of CD34⁺ cells were decreased. hUCB-MNC cell cycle blocked in G₁ phase. The antioxidant capacity also decreased and the intracellular ROS level increased significantly. The senescent hUCB-MNC increased.

CONCLUSION

5-Fluorouracil can result in oxidative damage of bone marrow stromal cells and change of function secreting bioactivators, thus induce oxidative stress in hematopoietic cells to initiate stress-induced premature senescence (SIPS).

Effect of targeted cognitive function exercise on constipation symptoms, cognitive function, and daily living ability in acute stroke patients with constipation

AIM

To investigate the effect of targeted cognitive function exercise on constipation symptoms, cognitive function, and daily living ability in acute stroke patients with constipation.

METHODS

Seventy-six patients with constipation after acute stroke were enrolled at Yinzhou People's Hospital from July 2016 to December 2017 and randomly divided into either a control group or an observation group, with 38 cases in each group. Both groups were given routine nursing measures for stroke and constipation. The observation group was additionally given targeted cognitive function exercise. The two groups were compared for Self-rating Anxiety Scale (SAS) scores, Self-rating Depression Scale (SDS) scores, constipation symptom scores, Mini-Mental State Examination (MMSE) scores, National Institutes of Health Stroke Scale (NIHSS) scores, Fugl-Meyer Rating Scale (FMA) scores, Barthel scores, and nursing satisfaction.

RESULTS

The scores of SAS, SDS, and constipation symptoms at 3 mo after intervention were significantly lower in the observation group than in the control group (P < 0.05). NIHSS scores in the observation group were significantly lower than those in the control group at 3 mo, while MMSE, FMA, and Barthel scores in the observation group were significantly higher than those in the control group (P < 0.05). The satisfaction rate in the observation group was 100.00% (38/38), which was significantly higher than that in the control group [78.95% (30/38), P < 0.05].

CONCLUSION

Targeted cognitive function exercise can effectively relieve constipation symptoms, increase cognitive function and daily living ability, and improve the relationship between nurses and patients in acute stroke patients with constipation.

Association between melatonin receptor 1A (MTNR1A) gene single-nucleotide polymorphisms and the velvet antler yield of Sika deer

Melatonin, a secretion from pineal gland is ambiguously considered as the key hormone involved in regulation of the antler cycle in Sika deer. To find out more about the roles of melatonin and its receptor gene, we carried out current study to investigate the association between polymorphisms in melatonin receptor 1A (MTNR1A) gene and the antler yield from Sika deer. A total of 251 Sika deer were analyzed in this study, of which consisted of Wusan Sika deer (n = 163) and Dongfeng Sika deer (n = 88). MTNRA gene was amplified by PCR and genotyped by Polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP). Three polymorphism loci (C518T, C629G and C635T) were detected in exon2 of MTNR1A gene. The restriction site Ecol881 was used for C518T while a C629G polymorphism locus was digested with Mval restriction endonucleases. In Wusan Sika deer the allele frequencies of C and T were 0.637 and 0.363 for C518T, Also C and G alleles in C629G locus were 0.206 and 0.794. Genotypic frequencies of allele CC, CT and TT were 33.7, 59.9 and 6.4 % respectively, It showed 1.8, 37.4 and 60.7 % for frequencies of genotypes CC, CG and GG. In Dongfeng Sika deer the allele frequencies of C and T were 0.518 and 0.482 for C518T, C and G alleles were 0.375 and 0.625 for C629G. Genotypic frequencies were 10.6, 82.4 and 7.1 % for genotypes CC, CT and TT respectively, and they were 1.1, 72.7 and 26.2 % for genotypes CC, CG and GG. Among three SNPs, only C629G showed significant association (P < 0.05) with average antler yield in Wusan Sika deer, while no SNP was significant in Dongfeng Sika deer. These preliminary results implied that the identified SNPs of MTNR1A gene might influence the antler yield in Wusan Sika deer.