Open Access

Sodium hydrosulfide alleviates dexamethasone‑induced cell senescence and dysfunction through targeting the miR‑22/sirt1 pathway in osteoblastic MC3T3‑E1 cells

  • Authors:
    • Peng Li
    • Wei-Wei Mao
    • Shuai Zhang
    • Liang Zhang
    • Zhi-Rong Chen
    • Zhi-Dong Lu
  • View Affiliations

  • Published online on: January 21, 2021     https://doi.org/10.3892/etm.2021.9669
  • Article Number: 238
  • Copyright: © Li et al. This is an open access article distributed under the terms of Creative Commons Attribution License.

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Abstract

Glucocorticoid‑induced osteoporosis is characterized by osteoblastic cell and microarchitecture dysfunction, as well as a loss of bone mass. Cell senescence contributes to the pathological process of osteoporosis and sodium hydrosulfide (NaHS) regulates the potent protective effects through delaying cell senescence. The aim of the present study was to investigate whether senescence could contribute to dexamethasone (Dex)‑induced osteoblast impairment and to examine the effect of NaHS on Dex‑induced cell senescence and damage. It was found that the levels of the senescence‑associated markers, p53 and p21, were markedly increased in osteoblasts exposed to Dex. A p53 inhibitor reversed Dex‑induced osteoblast injury, a process that was mitigated by NaHS administration through alleviating osteoblastic cell senescence. MicroRNA (miR)‑22 blocked the impact of NaHS on Dex‑induced osteoblast damage and senescence through targeting the regulation of Sirtuin 1 (sirt1) expression, as shown by the decreased cell viability and alkaline phosphatase activity, as well as an increased expression of p53 and p21. It was revealed that the sirt1 gene was the target of miR‑22 in osteoblastic MC3T3‑E1 cells through combining the results of dual luciferase reporter assays and reverse transcription‑quantitative PCR, as well as western blot analyses. Silencing of sirt1 abolished the protective effect of NaHS against Dex‑associated osteoblast senescence and injury. Taken together, the present study showed that NaHS prevents Dex‑induced cell senescence and damage through targeting the miR‑22/sirt1 pathway in osteoblastic MC3T3‑E1 cells.

Introduction

Glucocorticoids (GCs) are used clinically to treat a number of diseases, and it is estimated that 1-2% of the worldwide population are undergoing long-term GC therapy (1-4). However, long-term administration with GCs has been shown to result in multiple complications, common among which is GC-induced osteoporosis (GIO), which is characterized by systemic damage of the bone size and microarchitecture (5). A growing number of studies have revealed that osteoblast dysfunction disrupts the balance between bone formation and bone resorption in terms of the role that is exerted by bone mass in GIO, for example, by inhibiting osteoblast proliferation and differentiation, as well as enhancing the rate of osteoblast apoptosis (5-7).

Cell senescence is considered to be a state of cell cycle arrest, as well as physiological and metabolic dysfunction, which occurs under normal environmental conditions, with a gradual increase in its prevalence towards death (8). A previous study showed that cell senescence serves an important role in the development of osteoporosis (9). However, whether osteoblast senescence contributes to the development of GIO has yet to be elucidated.

Hydrogen sulfide (H2S) is an endogenously generated secondary messenger that is involved in regulating a wide range of physiological processes, including having cardioprotective and neuroprotective effects, as well exerting a beneficial role following acute lung injury (10-12). Furthermore, H2S also has a critical role in the occurrence and development of osteoporosis (13,14). Xu et al (13) demonstrated that H2S attenuates oxidative stress-induced osteoblastic cell damage and inhibits cell proliferation, as well as differentiation, through a MAPK-dependent signaling pathway. Additionally, Yang et al (14) found that H2S mitigates dexamethasone (Dex)-induced osteoblast injury by activating the AMP-activated protein kinase signaling (14); however, whether H2S inhibits Dex-induced osteoblast dysfunction through repressing cell senescence has yet to be elucidated.

MicroRNAs (miRs), as a class of highly conserved noncoding RNAs, which are able to post-transcriptionally modulate the expression of target genes and serve a critical role in various diseases (15-17). Numerous studies have shown that miRs contribute to the pathogenesis and development of osteoporosis (18-20). Notably, previous research showed that miR-22 was negatively correlated with the function of various cells (17,21,22). In the present study, alterations in the expression profile of biomarkers, such as p53 and p21, which are associated with cell senescence in Dex-treated MC3T3-E1 cells, and the effects of sodium hydrosulfide (NaHS) on Dex-induced osteoblast damage and senescence, were examined. Subsequently, the expression levels of miR-22 in Dex-treated osteoblast cells with or without NaHS administration were investigated to determine whether miR-22 is involved with the protective role that NaHS has in Dex-induced osteoblast dysfunction and cell senescence.

Materials and methods

Cell culture and drug administration

Osteoblastic murine MC3T3-E1 cells were cultured in α-MEM (α-MEM, Gibco; Thermo Fisher Scientific, Inc.) with 10% FBS (Thermo Fisher Scientific, Inc.) at a temperature of 37˚C and in an atmosphere containing 5% CO2/95% air. Absolute ethanol was used to dissolve the Dex (Sigma-Aldrich; Merck KGaA) and the cells were treated with Dex at a final concentration of 1 µM for 72 h, as previously described (23). The p53 inhibitor, pifithrin-α (Sigma-Aldrich; Merck KGaA) was dissolved in DMSO and the cells were treated with pifithrin-α at a concentration of 20 µM for 48 h (23). NaHS (Sigma-Aldrich; Merck KGaA) was dissolved in saline solution and used at 20 µM for 72 h. Dex and NaHS after 24 h of cell culture, and pifithrin-α was used after 48 h. The cell number used in these experiments was 2x105 cells/ml (200 µl each well in 48-well plate and 2 ml each well in 6-well plate).

Small interfering (si)RNA transfection assay

Xfect™ RNA transfection reagent (Takara Biotechnology Co., Ltd.) was used to perform sirtuin 1 (sirt1) siRNA transfections (200 nM; cat. no. sc-40987; Santa Cruz Biotechnology, Inc.) into osteoblastic MC3T3-E1 cells, with a non-targeting siRNA (Santa Cruz Biotechnology, Inc.) served as negative control. The sequences of control siRNA are as follows: 5'-UUCUUCGAACGUGUCACGUTT-3' and 5'-ACGUGACACGUUCGGAGAATT-3'. Osteoblasts were pretreated with control or sirt1 siRNA for 24 h and then immediately subjected to subsequent experimentation.

Cell viability analysis

MTT detection assays were performed to measure the viability of the osteoblasts. Briefly, osteoblastic cells were cultivated in a 48-well plate at a density of 2x105 cells/ml (200 µl each well) at 37˚C and the cells were subjected to Dex and NaHS treatment for 72 h, and pifithrin-α. was added for the last 48h. Cells were then exposed to MTT for 2-4 h at 37˚C in the dark and a microplate reader was used to detect absorbance of formazan crystals dissolved in DMSO at 550 nm.

Alkaline phosphatase (ALP) activity detection

The method described by Bowers and McComb was performed to measure ALP activity (24). Briefly, Triton X-100 was added into 1x105 osteoblasts at a final concentration of 1%. The supernatant was collected by centrifugation at 14,000 x g at 4˚C for 20 min. A total of 25 µl supernatant was added into the reaction mixture, which contained assay buffer and para-nitrophenyl phosphate (cat. no. P0321S; Alkaline Phosphatase Assay kit; Beyotime Institute of Biotechnology). Subsequently, the mixture was incubated for 10 min at 37˚C and a microplate reader was used to measure the absorbance of p-nitrophenol at 405 nm after termination of the reaction.

Dual luciferase assay

The psiCHECK2 luciferase reporter plasmid (Promega Corporation) was used to clone the synthesized wild-type (WT) and mutant 3'-untranslated region (UTR) of sirt1. The psiCHECK2 plasmid with WT or mutant derivatives and miRNA control or miR-22 mimic were co-transfected into the osteoblasts. Xfect™ RNA transfection reagent (Takara Biotechnology Co., Ltd.) was used to perform plasmid and miRNA control, as well as miR-22 mimic transfection. Cell lysates were collected 24 h post-transfection and the dual-luciferase reporter system (Dual-Luciferase® Reporter Assay System; cat. no. E1910; Promega Corporation) was used to measure firefly and Renilla luciferase activity. The ratio of luminescence between the experimental reporter (firefly) to the control reporter (Renilla) was used to reflect the relative luciferase activity of sirt1.

Reverse transcription-quantitative PCR (qPCR)

Total RNA was extracted from the osteoblasts using TRIzol® (Takara Biotechnology Co., Ltd.) and reverse transcribed into cDNA using SuperScript™ II reverse transcriptase (Thermo Fisher Scientific, Inc.) with a special stem-loop primer for miR-22 and oligodeoxythymidine for mRNAs with the following temperature protocol: 25˚C for 10 min; 42˚C for 1 h and 72˚C for 10 min). A MiniOpticon real-time PCR detection system (Bio-Rad Laboratories, Inc.) was used to perform qPCR. The reaction solution consisted of 5.0 µl diluted cDNA, 0.2 µM/l of each paired primer, 1x Sybr Green qPCR Mix buffer (Toyobo Biotech Co., Ltd.) and 4.9 µl DEPC-treated water. The annealing temperature was set at 58-62˚C and amplification was set at 40 cycles. The temperature range to detect the melting temperature of the PCR product was set from 60-95˚C. To determine the relative quantitation of gene expression, the comparative Cq (threshold cycle) method with arithmetic formulae (2-ΔΔCq) was used (25). mRNA levels of sirt1, p53 and p21 were normalized relative to the house-keeping gene β-actin. The primers used were as follows: Sirt1 (accession number NM_001159589.2) sense strand, 5'-CTGTTTCCTGTGGGATACCTGACT-3' and antisense strand, 5'-ATCGAACATGGCTTGAGGATCT-3' (26); p53 (accession number NM_001127233.1) sense strand, 5'-AGAGACCGCCGTACAGAAGA-3' and antisense strand, 5'-CTGTAGCATGGGCATCCTTT-3' (27); p21 (accession number NM_001111099.2) sense strand, 5'-AGCAAAGTGTGCCGTTGT CT-3' and antisense strand, 5'-AGAAATCTGTCAGGCTGGTC-3'; β-actin (accession number NM_007393.5) sense strand, 5'-AGCCATGTACGTAGCCATCC-3' and antisense strand, 5'-CTCTCAGCTGTGGTGGTGAA-3' (28). The sequence of miR-22 was AAGCUGCCAGUUGAAGAACUGU (29).

Western blot analysis

Osteoblast proteins were extracted using RIPA buffer including 1% protease inhibitor cocktail (Thermo Fisher Scientific, Inc.) and BCA assay was used to calculate the protein concentration. Then 30 µg proteins per lane was subjected to SDS-PAGE (10% gels) to separate, prior to their transfer onto PVDF membranes. After blocking with nonfat dry milk dissolved in TBS containing 0.05% Tween-20 for 1-2 h at room temperature, the membranes were incubated with antibodies against sirt1 (Santa Cruz Biotechnology, Inc.; cat. no. sc-74665); p53 (ProteinTech Group, Inc.; cat. no. 10442-1-AP) and p21 (ProteinTech Group, Inc.; cat. no. 28248-1-AP) and GAPDH (Santa Cruz Biotechnology, Inc.; cat. no. sc-137179) overnight at 4˚C at a dilution of 1:1,000. Subsequently, the membranes were incubated with a secondary horseradish peroxidase-conjugated antibody for 1-2 h at room temperature at a dilution of 1:2,000, including goat anti-rabbit IgG-HRP (Santa Cruz Biotechnology, Inc.; cat. no. sc-2004) and goat anti-mouse IgG-HRP (Santa Cruz Biotechnology, Inc.; cat. no. sc-2005). An enhanced chemiluminescence western blotting detection system (Santa Cruz Biotechnology, Inc.) and a GeneGnome HR scanner (Syngene) were used to visualize the immunoreactive proteins and chemiluminescent signal from the membranes. The expression levels of the proteins of interest were normalized to GAPDH.

Bioinformatics analysis

The TargetScan (http://www.targetscan.org/) and miRanda, (http://www.microrna.org/microrna/home.do) tools were used to perform target prediction. The target genes predicted by TargetScan and miRanda were screened based on their scoring criteria. In the TargetScan algorithm, target genes with a context percentile <50 were excluded. In the miRanda algorithm, target genes with Max-Energy >-10 were excluded. The overlapping prediction results were selected as the candidate target genes of miR-22 (30,31).

Statistical analysis

SPSS 16.0 (SPSS, Inc.) was used to perform the data analysis. Data are presented as the mean ± SEM. Statistical comparisons between two groups were determined using two-tailed paired Student's t-test. One-way or two-way ANOVAs, with Bonferroni's post hoc tests were performed for comparisons among multiple groups. P<0.05 was considered to indicate a statistically significant value.

Results

Osteoblast senescence contributes to Dex-induced osteoblast dysfunction

Firstly, alterations in the levels of the senescence-associated biomarkers, p53 and p21, in osteoblastic MC3T3-E1 cells exposed to Dex, were measured in the present study. As shown in Fig. 1A and B, the mRNA and protein expression levels of p53 and p21 were significantly increased in the Dex-treated osteoblasts, suggesting that osteoblast senescence was involved in Dex-induced cell damage. Subsequently, a p53 inhibitor (pifithrin-α) was used to measure the impact of Dex-induced osteoblast damage. It was found that Dex treatment resulted in a decreased cell viability and ALP activity, with these results being partly reversed by pifithrin-α, as shown by the increased cell viability and ALP activity (Fig. 1C and D).

NaHS mitigates Dex-induced osteoblast dysfunction and senescence

Subsequently, the effects of NaHS on osteoblast dysfunction and senescence exposed to Dex were measured. As shown in Fig. 2, compared with control group, cell viability and ALP activity in the Dex-treated group were markedly decreased, whereas the expression of p53 and p21 at the mRNA and protein levels was significantly increased. However, NaHS attenuated Dex-induced osteoblast damage and senescence, as shown by the increased cell viability (Fig. 2A) and the increase in ALP activity (Fig. 2B) in the Dex and NaHS treated group. Additionally, NaHS treatment caused an increase in the mRNA and protein expression levels of p53 and p21 (Fig. 2C and D).

miR-22 mimic blocks the beneficial effects of NaHS on Dex-induced osteoblast dysfunction and senescence

In the present set of experiments, it was found that the miR-22 levels in MC3T3-E1 cells that Dex-treated were significantly increased (Fig. 3A). Subsequently, the present study investigated whether alterations in the miR-22 levels were also associated with the protective effect of NaHS against Dex-induced osteoblast damage and senescence. As shown in Fig. 3A, the increased miR-22 levels in Dex-treated MC3T3-E1 cells was reversed upon administration of NaHS. Moreover, as shown in Fig. S1A, miR-22 mimic transfection resulted in a markable increase expression of miR-22. It was found that the miR-22 mimic blocked the NaHS-induced increases in cell viability and ALP activity that were observed in MC3T3-E1 cells exposed to Dex (Fig. 3B and C). Furthermore, the miR-22 mimic also reversed the NaHS-induced downregulation of p53 and p21 at the mRNA and protein levels in MC3T3-E1 cells subjected to Dex (Fig. 3D and E).

sirt1 is the target of miR-22 in osteoblastic MC3T3-E1 cells

As previously mentioned, miRs are able to post-transcriptionally and negatively regulate the expression of target genes (15-17). TargetScan and miRanda were used to perform target prediction analysis of miR-22, and sirt1 was found to be an overlapping gene. As shown in Fig. 4A, one evolutionarily conserved sequence of the sirt1 gene was complementary to miR-22. As shown in Fig. 4B and C, the miR-22 mimic was able to significantly suppress the mRNA and protein expression levels of sirt1. Sirt1 3'-UTR luciferase reporter constructs and miR-22 mimics were transfected into osteoblastic MC3T3-E1 cells to confirm the direct regulatory effect of miR-22 on sirt1 expression. A significant decrease in luciferase activity in the miR-22 mimic group was found compared with the miR control group (Fig. 4D). No decrease in luciferase activity was observed upon co-transfection of miR-22 mimic with the sirt1 3'UTR luciferase reporter construct containing a mutated target sequence. These results suggested that miR-22 could suppress sirt1 expression in osteoblastic MC3T3-E1 cells through binding to response elements in its 3'-UTR.

Silencing of sirt1 blocks the protective role of NaHS against Dex-induced osteoblast damage and senescence

As shown in Fig. 5A, the protein expression level of sirt1 was significantly decreased in Dex-treated osteoblasts, although this was reversed upon administration of NaHS. Furthermore, the addition of sirt1 siRNA led to a marked decrease in mRNA and protein expression levels of sirt1 (Fig. S1B and C). Consequently, whether sirt1 is associated with the beneficial effects of NaHS against Dex-induced osteoblast senescence was investigated. As shown in Fig. 5A, sirt1 siRNA blocked the inhibitory effect of NaHS against Dex-induced osteoblast senescence, as shown by the increased protein levels of p53 and p21. In addition, sirt1 siRNA also abolished the beneficial effects of NaHS against Dex-induced osteoblast damage, as evidenced by decreased cell viability and ALP activity (Fig. 5B and C).

Discussion

In the present study, it has been shown that osteoblast senescence may contribute to Dex-induced dysfunction and that a p53 inhibitor (pifithrin-α) could partly reverse the osteoblast damage induced by Dex, as revealed by increased levels of cell proliferation and ALP activity. Moreover, NaHS mitigated the Dex-induced damage and senescence through targeting the miR-22/sirt1 pathway, as miR-22 mimic and sirt1 siRNA blocked the beneficial effects of NaHS on Dex-induced osteoblast dysfunction and senescence, and sirt1 is a target of miR-22.

An accumulating number of studies have suggested that cell senescence exerts a dominant role in a wide variety of diseases, including hepatocarcinogenesis (32), intervertebral disc degeneration (33), diabetic nephropathy (34), diabetic cardiomyopathy (35), Parkinson's disease (36) and Alzheimer's disease (37). Additionally, the crucial role of cell senescence in the development of osteoporosis has also been widely recognized (38,39). Zhang et al (38) revealed that osteoblastic cell senescence may contribute to osteoporosis resulting from estrogen deficiency, and this process is accelerated upon treatment with serum from ovariectomized rats. Khosla et al (39) determined that this may be a novel therapeutic paradigm for restraining, or even reversing, age-associated osteoporosis via targeting cellular senescence.

It is widely accepted that sirt1 protects osteoblastic cells against multiple unfavorable factors, including hypoxia (40); TiAl6V4 particles and CoCrMo particles (41); hydrogen peroxide (42); and sodium fluoride (43). Interestingly, it is also recognized that sirt1 prevents cell senescence, with sirt1 knockdown inducing cell senescence (44-48). Ota et al (44) demonstrated that overexpression of sirt1 could provide protection against stress-caused endothelial damage through repressing premature senescence of human endothelial cells. Zu et al (46) also showed that sirt1 prevents primary porcine aortic endothelial cell senescence by targeting serine/threonine kinase 11. In the present study, senescence and dysfunction in osteoblastic MC3T3-E1 cells were phenotypically shown to be associated with decreased sirt1 expression levels. Among many factors that negatively regulate gene expression, an accumulating number of studies have provided confirmatory evidence in support of an essential role for miRs (15-17). miR-22 is a widely expressed miR, and bioinformatics analysis and previous studies (21,22,49) have shown that sirt1 is the target of miR-22 in osteoblastic MC3T3-E1 cells. Chen et al (21) demonstrated that miR-22 induces human glioblastoma cell dysfunction through the direct targeting of sirt1, as revealed by suppressed levels of cell proliferation, motility and invasion. Zou et al (22) also revealed that miR-22 could restrict cell growth and metastasis in breast cancer through targeting sirt1 and the miR-22/sirt1 signaling pathway, also proposing that this potentially forms the basis of a novel therapeutic strategy for breast cancer. Another study demonstrated that upregulation of miR-22 contributes to ischemia-reperfusion-induced myocardial damage by directly targeting sirt1, which exerts a critical role in the regulation of mitochondrial function (17). In the present study, it was also shown that upregulation of miR-22 is involved in Dex-induced osteoblastic cell senescence and injury through targeting the regulation of sirt1 expression. However, further research is required to determine whether alteration of the mitochondrial function in Dex-treated osteoblast cells is involved in the underlying mechanism of action.

Previous studies have demonstrated that NaHS, an H2S donor, exerts a protective role in multiple diseases, including chronic restrain stress (CRS)-induced cognitive damage (50), cerebral IR injury (51), chronic kidney disease (52,53) and high pulmonary blood flow-induced pulmonary artery collagen remodeling (54). Interestingly, Li et al (50) showed that H2S mitigates CRS-induced cognitive damage and hippocampal impairment through the upregulation of sirt1. A growing number of studies have shown that H2S may protect a variety of cell types from adverse factors by delaying cell senescence (55-57). Zheng et al (57) demonstrated that NaHS delays cellular senescence of human umbilical vascular endothelial cells through upregulating sirt1 expression. In agreement with these results, the results of the present study have also demonstrated that NaHS mitigated Dex-induced osteoblastic cell senescence and impairment through the upregulation of sirt1 expression.

A limitation of the present study was that the results were gained in vitro. Further in vivo studies would be beneficial to confirm the present findings. Interestingly, Ma et al (58) demonstrated that exogenous H2S attenuates Dex-induced inhibition of osteoblast proliferation and osteogenic differentiation by activating the Wnt/β-catenin signaling pathway. Additionally, Xia et al (59) indicated that activation of the Wnt/β-catenin signaling pathway is negatively related to cell senescence. As such, it was speculated that exogenous H2S alleviates Dex-induced osteoblast dysfunction through inhibition of senescence. Furthermore, future studies should investigate the mechanism of action behind how Dex treatment leads to increased expression levels of miR-22, as well as the other targets of miR-22 in Dex-treated osteoblasts.

As summarized in Fig. 6, the present study demonstrated that NaHS prevented Dex-induced osteoblastic MC3T3-E1 cell senescence and damage through targeting the miR-22/sirt1 pathway.

Supplementary Material

Impact of miR-22 mimic transfection and sirt1 siRNA on the expression of miR-22 and sirt1 at the mRNA and protein expression levels in osteoblastic MC3T3E1 cells. Osteoblasts were transfected with miR control or miR22 mimic (200 nM) for 24 h. RT-qPCR was performed to measure the expression levels of miR22 (A). Osteoblasts were transfected with control siRNA or sirt1 siRNA for 24 h. RT-qPCR and western blot analyses were performed to determine sirt1 mRNA (B) and protein (C) expression levels, respectively, in osteoblasts. Data are shown as the mean ± SEM (n=4). **P<0.01 vs. the control. miR, microRNA; RT-qPCR; reverse transcription PCR; siRNA, small interfering RNA; sirt1, sirtuin 1.

Acknowledgements

Not applicable.

Funding

The present study was supported by the key incubation project of Li Peng from the Science and Technology Department of Ningxia Medical University, Key Incubation Project.

Availability of data and materials

The datasets used and/or analyzed during the current study are available from the corresponding author on reasonable request.

Author's contributions

ZDL was responsible for study design and manuscript preparation. PL performed manuscript preparation, data collection and statistical analysis. WWM contributed to data interpretation. The literature search and dual luciferase assay were performed by SZ, LZ and ZRC. All authors read and approved the final manuscript.

Ethics approval and consent to participate

Not applicable.

Patient consent for publication

Not applicable.

Competing interests

The authors declare that they have no competing interests.

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March-2021
Volume 21 Issue 3

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Online ISSN:1792-1015

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Spandidos Publications style
Li P, Mao W, Zhang S, Zhang L, Chen Z and Lu Z: Sodium hydrosulfide alleviates dexamethasone‑induced cell senescence and dysfunction through targeting the miR‑22/sirt1 pathway in osteoblastic MC3T3‑E1 cells. Exp Ther Med 21: 238, 2021.
APA
Li, P., Mao, W., Zhang, S., Zhang, L., Chen, Z., & Lu, Z. (2021). Sodium hydrosulfide alleviates dexamethasone‑induced cell senescence and dysfunction through targeting the miR‑22/sirt1 pathway in osteoblastic MC3T3‑E1 cells. Experimental and Therapeutic Medicine, 21, 238. https://doi.org/10.3892/etm.2021.9669
MLA
Li, P., Mao, W., Zhang, S., Zhang, L., Chen, Z., Lu, Z."Sodium hydrosulfide alleviates dexamethasone‑induced cell senescence and dysfunction through targeting the miR‑22/sirt1 pathway in osteoblastic MC3T3‑E1 cells". Experimental and Therapeutic Medicine 21.3 (2021): 238.
Chicago
Li, P., Mao, W., Zhang, S., Zhang, L., Chen, Z., Lu, Z."Sodium hydrosulfide alleviates dexamethasone‑induced cell senescence and dysfunction through targeting the miR‑22/sirt1 pathway in osteoblastic MC3T3‑E1 cells". Experimental and Therapeutic Medicine 21, no. 3 (2021): 238. https://doi.org/10.3892/etm.2021.9669