INTRODUCTION

Dry eye disease is a developing health problem resulting in serious impacts on general state of health, functional vision, economy and life quality

. The primary pathogenesis of dry eye disease contains, tear film flimsiness, causing and went with by tear hyperosmolarity, driving to epithelial inflammation and damage

. Recent evidences have documented that the levels of pro-inflammatory cytokines and chemokines increase in the tear fluid of dry eye

. In dry eye conditions tear clearance decreases, which can also cause increased concentrations of proinflammatory cytokines;whereas before these studies, dry eye disease was thought to be caused simply by insufficient tear production. Nowadays,dry eye disease is also known as an inflammatory disorder.

Tear film disorders are followed by matrix metalloproteinase(MMP) intervened corneal disease

. Collagenases (MMP-1,MMP-13), gelatinases (MMP-9), and stromelysins (MMP-3) have been recommended to play a critical part within the disruption of corneal epithelium under hyperosmolar model

.In ocular surface, the corneal epithelium forms a barrier to noxious stimuli and prevents foreign material within the outside environment

. Four kinds of junctions have been identified to form this barrier, including tight junction (TJ),desmosomes, adherens junctions, and gap junctions

. The foremost layer is the TJ between adjoining cells. The TJ proteins ZO-1 and Occludin form the very first barrier for the eyeball. Recent studies have found that MMP-9 is able to disrupt one of the proteins, Occludin

. TNF-α has been found to induce the destruction of ZO-1 from the neighboring human corneal epithelial cells (HCECs)

. Disruption of these TJ proteins leads to numerous pathological situations, resulting in infection, or melting of the cornea

.

But the physiological mechanism of the disruption of the TJ proteins, as well as the association between tumor necrosis factor (TNF)-α and MMPs under hyperosmotic dry eye condition, remains unclear.

HCECs are the most broadly used models for studies of dry eye disease

. Hyperosmolar stress is widely applied to these primary cells to mimic dry eye hyperosmotic conditions

. The latest studies showed that dry eye disease models were treated with hyperosmotic saline solution in 500 mOsM/L both

and

. We hypothesized that the TJ may be disrupted in hyperosmolarity dry eye condition by inflammation, and we used nuclear factor-κB(NF-κB) inhibitor and MMP inhibitor to identify the roles of TNF-α and MMPs in this process.

MATERIALS AND METHODS

Fresh corneoscleral tissues of human(＜72h after death), donors aged 18-70 years old, after the central cornea had been used for keratoplasty. Primary HCECs (Figure 1A) were cultured on 8-chamber slides for immunofluorescence (IF) staining and in 12-well plates for RNA extraction or enzyme-linked immunosorbent assay(ELISA) for cytokine proteins. Primary corneal epithelial cells migrate from limbus. We used the explants from corneal limbus in supplemented hormonal epidermal medium (SHEM)with 5% fetal bovine serum (FBS) according to the protocol of previous publications

.

Primary HCECs cultured for 14-19d were exchanged with serum-free medium for 24h, then adding 44,69 or 94 mmol/L sodium chloride (NaCl) for hyperosmolar stress group (400, 450 and 500 mOsM) or adding rh-TNF-α(10 ng/mL) as TNF-α group. NF-κB inhibitor (5 μmol/L) was added 1h before that treatment (500 mOsM or TNF-α group)to antagonize the effect of TNF-α. MMP inhibitor GM-6001(20 μmol/L) was also added 1h before that treatment (500 mOsM or TNF-α group) to antagonize the effect of MMP.

水力壓裂是個復雜的過程，裂隙通常沿垂直于最小主應力方向擴展，但裂隙形態(tài)、擴展方向并不僅取決于某一個因素，如煤體均質性、原生裂隙分布特征、地應力狀態(tài)等都可能會對壓裂效果產生影響[17-18]。在多孔控制定向水力壓裂技術中，孔隙水壓的分布特征與地應力組合影響下煤體起裂、裂隙擴展規(guī)律有待研究。

HCECs treated for 4h were used for mRNA expression.HCECs treated for 24h were used for IF staining or ELISA.

因為故對任意ε>0,存在Nk,使得當n>Nk時, ρ(An(xk),ak)<ε,即1-an(xk)?ak> <ε,從而an(xk)?ak> 1-ε。取N=max{N1,…,Nr},則對任意ε>0,存在N,當n>N時,

ε,從而an(xk)?ak

ε,即1-an(xk)?ak

綜上，針對肝硬化患者，在給予常規(guī)治療及護理的同時，配合實施優(yōu)質護理干預，可有效提高患者的生活質量，效果較好，值得推廣。

GM-6001 (potent and broad spectrum MMP inhibitor) protected cells from destruction of ZO-1 and Occludin by hyperosmolar stress and rh-TNF-α.

The cultured HCECs on 8-chamber slides were exchanged with FBS-free SHEM and were treated with 90 mmol/L of NaCl to make hyperosmolar media (500 mOsM) for 24h, and the untreated media served as control group (312 mOsM). MMP inhibitor GM-6001(20 μmol/L) was added 1h before. Cells on slides were fixed in cold acetone (for TJ proteins ZO-1, Occludin staining),then blocked with 20% goat serum (Abcam, Cambridge, MA,USA). Slides were then incubated at 4℃ overnight with rabbit anti-mouse ZO-1 and Occludin antibodies (Invitrogen, dilution 1:200), then incubated with secondary antibodies and DAPI for one hour.

VRML除了在工程技術、建筑、電子商務和娛樂等領域廣泛應用外，也可以應用于高職智慧課堂教學。由VRML實現的模擬仿真課件，與一般的模擬仿真課件相比，能營造更為逼真的環(huán)境或場景，人機交互更為自然，更能增強想象力，增加學生的感官刺激，激發(fā)學習興趣。下面列出幾個典型的網絡教學應用。

Data analysis was done using GraphPad Prism 8.0.2 (California, USA). Student’s

-test was used to infer statistical significance between two groups.

＜0.05 were considered to be statistically significant.

RESULTS

To evaluate the subcellular distribution of TJ proteins in dry eye, hyperosmotic media at 500 mOsM was used in HCECs. IF staining was done to evaluate the integrity of major TJ proteins, ZO-1 and Occludin. As shown in Figure 1B,the immunoreactivities staining of these two proteins showed a contiguous network morphology in the untreated (UT) group(SHEM with iso-osmolarity 312 mOsM).

However, these two junction proteins were significantly disrupted when exposed to hyperosmotic media at 500 mOsM after 24h, appearing their inadequate connections and irregular staining of the damaged network between cells.

東海 2號機組是第15臺獲得規(guī)制委重啟許可的機組，是首臺在 2011年3月的地震和海嘯中受損并獲準重啟的機組，同時也是第三臺獲準重啟的沸水堆機組。另外兩臺獲準重啟的沸水堆機組是柏崎·刈羽6號和7號機組。

The corneal epithelial barrier is formed by four kinds of junctions. Among them, the TJ is the major intercellular intersection structure, with ZO-1, Occludin, and others as essential component proteins. Studies showed that the TJ play an imperative role in protecting the ocular surface against adverse external conditions

. Another important role for TJ was the control of cell proliferation and gene expression

.We found that these important TJ proteins were significantly disrupted, and the net-structure stain of TJ proteins was destroyed when exposed to hyperosmotic media after 24h.However, the physiological mechanism of the disruption of the TJ proteins in hyperosmolarity condition is still elusive.

HCECs were treated with either hyperosmolar media (500 mOsM) or rh-TNF-α (10 ng/mL) for 4h or 24h with or without NF-κB inhibitor (5 μmol/L) added 1h before.

4.一旦在得到確診的基礎上，筆者認為采取封鎖、隔離、緊急接種、藥物治療等綜合措施，是能夠有效治愈和控制疫病的流行和傳播，為養(yǎng)豬戶最大限度減少經濟損失，保障規(guī)模養(yǎng)豬大戶經濟利益，促進我區(qū)生豬生產健康發(fā)展。

When exposed to 500 mOsM or rh-TNF-α, the structure of ZO-1 and Occludin proteins was disrupted. However, 20 μmol/L of GM-6001 pre-added in 500 mOsM medium 1h before,restored most of those disruption. Interestingly, this phenomenon also happened in rh-TNF-α treated medium. When 20 μmol/L GM-6001 pretreated, the disruption of ZO-1 and Occludin was prevented in rh-TNF-α treated HCECs (Figure 4).

The mRNA level of MMP-9 increased to 4.68±0.71 and 3.85±0.74 fold, when exposed to hyperosmolar stress (500 mOsM)and rh-TNF-α (

＜0.001,

＜0.005), but decreased to 2.08±0.36 fold (

＜0.001, 500 mOsM group) and 2.40±0.44 fold(

＜0.005, TNF-α group) with addition of NF-κB inhibitor.The MMP-9 protein level increased from 7.43±1.55 pg/mL to 24.86±2.82 and 25.15±3.55 pg/mL (

＜0.001,

＜0.001) when exposed to hyperosmolar stress (500 mOsM) and rh-TNF-α,but decreased to 9.80±2.10 pg/mL (

＜0.0001, 500mOsM group) and 8.95±2.33 pg/mL (

＜0.001, TNF-α group) with addition of NF-κB inhibitor (Figure 3C).

The mRNA level of MMP-3 increased to 4.90±0.60 and 4.06±0.42 fold, when exposed to hyperosmolar stress(500 mOsM) and rh-TNF-α (

＜0.001,

＜0.0001), but decreased to 2.25±0.60 fold (

＜0.0001, 500 mOsM group)and 2.00±0.64 fold (

＜0.0001, TNF-α group) with addition of NF-κB inhibitor. The MMP-3 protein level increased from 19.54±5.32 pg/mL to 87.61±15.20 and 73.83±12.03 pg/mL(

＜0.001,

＜0.001) when exposed to hyperosmolar stress(500 mOsM) and rh-TNF-α, but decreased to 39.47±7.35 pg/mL(

＜0.01, 500 mOsM group) and 33.16±7.51 pg/mL (

＜0.01,TNF-α group) with addition of NF-κB inhibitor (Figure 3D).NF-κB is a key mediator of TNF-α actions. The effect of TNF-α was antagonized by NF-κB inhibitor (NF-κB-I). The levels of MMPs increased significantly when HCECs were exposed to hyperosmolar stress. The expression levels of these MMPs also increased in HCECs treated with rh-TNF-α. The stimulated MMPs by hyperosmolarity and TNF-α were largely suppressed by NF-κB inhibitor.

1.4 統(tǒng)計學處理 利用WHONET 5.4版軟件對兩組CNS藥敏數據進行耐藥性分析。采用SPSS 13軟件包對兩組數據進行統(tǒng)計分析，計數資料選用Z檢驗，P＜0.05為差異有統(tǒng)計學意義。

From these results, we infer that TNF-α mediated the mRNA and protein level of MMPs stimulated by hyperosmotic stress.That hyperosmolarity stimulates the level of MMPs through the increased expression of TNF-α.

The cell culture supernatants were collected after different treatments

. ELISA for TNF-α and MMPs (BioLegend, San Diego, CA, USA)were performed by manufacturers’ protocols and previously reported methods

. Absorbance was studied at 450 nm and 570 nm using Infinite M200 microplate reader (Tecan US, Inc.,Morrisville, NC, USA).

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The mRNA level of MMP-1 increased to 4.80±0.47 and 3.96±0.65 fold, respectively, when exposed to hyperosmolar stress (500 mOsM) and rh-TNF-α (

＜0.0001,

＜0.001).MMP-1 level decreased, with addition of NF-κB inhibitor, to 2.05±0.23 fold (

＜0.001, 500 mOsM group) and 1.75±0.44 fold (

＜0.001, TNF-α group). The protein level of MMP-1 in HCECs increased from 21.39±5.63 to 73.55±10.46 and 64.03±12.39 ng/mL (

＜0.005,

＜0.01) when exposed to hyperosmolar stress (500 mOsM) and rh-TNF-α, but decreased to 26.79±6.93 (

＜0.005, 500 mOsM group) and 31.51±7.81 ng/mL (

＜0.001, TNF-α group) with addition of NF-κB inhibitor (Figure 3A).

The mRNA level of MMP-13 increased to 8.05±0.81 and 6.49±0.58 fold, when exposed to hyperosmolar stress (500 mOsM) and rh-TNF-α, (both

＜0.0001), but decreased to 2.62±0.45 fold (

＜0.001, 500 mOsM group) and 2.79±0.40 fold (

＜0.0001, TNF-α group) with addition of NF-κB inhibitor. The MMP-13 protein level increased from 159.82±25.00 pg/mL to 966.53±101.79 and 806.19±143.41 pg/mL (

＜0.001,

＜0.005) when exposed to hyperosmolar stress (500 mOsM) and rh-TNF-α, but decreased to 255.18±57.87 pg/mL (

＜0.001, 500 mOsM group) and 367.49±74.03 pg/mL (

＜0.005, TNF-α group)with addition of NF-κB inhibitor (Figure 3B).

After treatments, total RNA was extracted using extraction kit (RNeasy Micro RNA kit) with protocol. RNA concentrations were measured with NanoDrop? ND-2000 Spectrophotometer. Reverse transcription was performed by RT using Ready-To-Go You-Prime First-Strand Beads.(25℃ for 10min and 37℃ for 60min). Quantitative reverse transcription polymerase chain reaction (RT-qPCR) was performed essentially as described in detail previously

.In short, 50℃ for 2min and 95℃ for 10min, 40 cycles of 95℃ for 15s and 60℃ for 1min. TaqMan gene expression assays of primer were: GAPDH (Hs99999905_m1), MMP-1(Hs00899658_m1), MMP-13 (Hs00942589_m1), MMP-9(Hs00234579_m1), MMP-3 (Hs00233962_m1), TNF-α(Hs00174128_m1).

Taken together, these results suggest that hyperosmolarity disrupts the TJ proteins ZO-1 and Occludin

TNF-α/MMP pathway in HCECs.

DISCUSSION

As assessed by RT-qPCR (Figure 2A), TNF-α mRNA level was osmolarity-dependently upregulated to 4.11±1.67(

＜0.05), 11.98±4.19 (

＜0.05) and 17.17±5.12 (

＜0.01)fold, respectively, when HCECs were exposed to different hyperosmolar media (400, 450 or 500 mOsM) compared with UT group. To quantify the protein levels of TNF-α in HCECs,ELISA was used. TNF-α levels in the supernatants increased significantly from 28.80±10.84 pg/mL in UT group to 189.49±27.12 pg/mL (

＜0.0001) in hyperosmolar stress group (500 mOsM; Figure 2B).

那段時光不知道究竟有多長，但青辰記得，自己是被一種“嘎嘎咔咔”的聲音驚醒的。醒來時，他發(fā)現自己仍然跪伏著，頭臉埋在地上，身體在不聽使喚地戰(zhàn)栗著。

In dry eye conditions proinflammatory cytokines, such as TNF-α increased

. MMPs were proposed to play the important role in the disruption of corneal epithelium under hyperosmolar stress

. But the relationship between TNF-α and MMPs in the process is not clear.

We observed that TNF-α and MMPs both increased by hyperosmolar stress at mRNA and protein level. Interestingly,the stimulatory effect of MMPs was repressed by NF-κB inhibitor under hyperosmolar stress. NF-κB is a key mediator of TNF-α actions

. TNF-α activates the NF-κB signaling pathway in HCECs

. TNF-α production and activation of the NF-κB/IκBα pathway were measured to evaluate inflammatory effects

dry eye disease model

.

To confirm that TNF-α can cause the increase of MMPs, we added rh-TNF-α in medium and found that in rh-TNF-α treated HCECs, MMPs also increased. These stimulated MMPs were suppressed by NF-κB inhibitor. These findings reveal that the hyperosmolar stress stimulated production of MMPs was through increasing TNF-α expression.

Then we tried to determine if the disruption of TJ is in connection with this TNF-α/MMP pathway in HCECs under hyperosmolar stress. When exposed to 500 mOsM or rh-TNF-α treated medium, the integrity structure of ZO-1 and Occludin was disrupted. While, 20 μmol/L GM-6001 (MMP inhibitor) pre-added in 500 mOsM medium one hour before,prevented most of this disruption.

Interestingly, this phenomenon also occurred in rh-TNF-α treated medium. When 20 μmol/L GM-6001 pre-added in rh-TNF-α treated medium, the disruption of ZO-1 and Occludin was reduced, suggesting TJ disruption in hyperosmolar stress and TNF-α was protected by MMP inhibitor GM-6001. Taken together, hypertonicity-induced TNF-α upregulation leads to disruption of TJ proteins through MMP activation.

In conclusion, our findings demonstrate that hyperosmolarity disrupts the TJ proteins ZO-1 and Occludin

TNF-α/MMP pathway in HCECs, further suggesting that drugs targeting MMPs upregulation may be a protective option to the ocular surface in dry eye disease. Although, HCECs are the most broadly used models

for studies of dry eye disease

.Some data from animal models or human patients would be significant. However, animal experiments are proceeding very slowly at present, due to the pandemic of COVID-19. These findings would further validated using an animal model in our future work.

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