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As novel agonists of Wnt/β-catenin signaling pathway, R-spondin proteins constitute a class of ligands, including R-spondin 1/2/3/4, functioning through their receptors leucine-rich repeat-containing G-protein coupled receptor (LGR)4/5/6 to enhance Wnt/β-catenin activity. Since Wnt signaling plays pivotal roles in the regulation of many life processes involved in embryogenesis and adulthood, R-spondin proteins also take part in cell proliferation, differentiation and morphogenesis.For example, in the formation of respiratory system，R-spondin 2 is required for normal laryngeal-tracheal and lung morphogenesis，and the lack of R-spondin 1 expression results in the absence of duct side-branching development and subsequent alveolar formation. In addition, R-spondins show protective effect in tissue injury and diseases. R-spondin 1 and R-spondin 3 have been reported to prevent chemotherapy- or radiotherapy-induced mucous membrane lesion. R-spondin 1 attenuates oral mucositis contributed by radiotherapy in mouse models and R-spondin 3 potentiates intestinal regeneration elicited via gastrointestinal toxic effect of chemoradiotherapy treatment. However, whether R-spondin proteins exert salient influence on acute lung injury especially induced by mechanical ventilation is deficient. Therefore, this study aims to ascertain the implication of R-spondin proteins in the pathology of mechanical ventilation induced lung injury through detecting human plasma concentration change of R-spondin 1/2/3/4 after mechanical ventilation and interference effects in mouse model, which is helpful for prevention and treatment of ventilation induced lung injury.
Mechanical ventilation is a critical intervention for patients with acute respiratory failure. However, lung overdistension induced by mechanical ventilation also causes pulmonary endothelial dysfunction. The injurious effect of mechanical stretch on pulmonary endothelium has been implicated in the development of ventilator-induced lung injury, which is characterized by pulmonary inflammation and particularly increased vascular permeability. In addition, the investigators and others have previously shown that mechanical stretch increases cultured lung endothelial monolayer permeability in vitro and promotes lung vascular permeability in mice Thus, elucidating the mechanisms underlying the mechanical stretch-induced lung endothelial barrier dysfunction may provide a novel clinical therapeutic target against ventilator-induced lung injury.
As novel agonists of Wnt/β-catenin signaling pathway, R-spondin proteins constitute a class of ligands, including R-spondin 1/2/3/4, functioning through their receptors leucine-rich repeat-containing G-protein coupled receptor (LGR)4/5/6 to enhance Wnt/β-catenin activity. Since Wnt signaling plays pivotal roles in the regulation of many life processes involved in embryogenesis and adulthood, R-spondin proteins also take part in cell proliferation, differentiation and morphogenesis. For example, in the formation of respiratory system，R-spondin 2 is required for normal laryngeal-tracheal and lung morphogenesis，and the lack of R-spondin 1 expression results in the absence of duct side-branching development and subsequent alveolar formation. In addition, R-spondins show protective effect in tissue injury and diseases. R-spondin 1 and R-spondin 3 have been reported to prevent chemotherapy- or radiotherapy-induced mucous membrane lesion. R-spondin 1 attenuates oral mucositis contributed by radiotherapy in mouse models and R-spondin 3 potentiates intestinal regeneration elicited via gastrointestinal toxic effect of chemoradiotherapy treatment. However, whether R-spondin proteins exert salient influence on acute lung injury especially induced by mechanical ventilation is deficient. Therefore, this study aims to ascertain the implication of R-spondin proteins in the pathology of mechanical ventilation induced lung injury through detecting human plasma concentration change of R-spondin 1/2/3/4 after mechanical ventilation and interference effects in mouse model, which is helpful for prevention and treatment of ventilation induced lung injury.
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| control／mechanical ventilation | venous blood samples collected from patients twice，relatively before mechanical ventilation and 3rd hour after mechanical ventilation |
|
| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| mechanical ventilation | Other | mechanical ventilation protocol: tidal volume 6-8 ml/kg, positive end-expiratory pressure 5 cm H2O, oxygen concentration 40%; respiratory rate 10-15/min, inspiratory/expiratory ratio 1:1.5. |
| Measure | Description | Time Frame |
|---|---|---|
| Change in Plasma Concentration of R-spondin 1 | The venous blood samples were collected twice for each patient that the first time was around the onset of the mechanical ventilation and the second was 3rd hour after the onset of the mechanical ventilation, which were named as sample A and sample B relatively. Then, plasmids were separated by centrifugation and detected for R-spondin1 concentration. And the outcome was calculated by subtracting the R-spondin1 plasmid concentration of sample A from the R-spondin1 plasmid concentration of sample B, which was the change in plasma concentration of R-spondin1. | 3 hours |
| Change in Plasma Concentration of R-spondin 2 | The venous blood samples were collected twice for each patient that the first time was around the onset of the mechanical ventilation and the second was 3rd hour after the onset of the mechanical ventilation, which were named as sample A and sample B relatively. Then, plasmids were separated by centrifugation and detected for R-spondin2 concentration. And the outcome was calculated by subtracting the R-spondin2 plasmid concentration of sample A from the R-spondin2 plasmid concentration of sample B, which was the change in plasma concentration of R-spondin2. | 3 hours |
| Change in Plasma Concentration of R-spondin3 | The venous blood samples were collected twice for each patient that the first time was around the onset of the mechanical ventilation and the second was 3rd hour after the onset of the mechanical ventilation, which were named as sample A and sample B relatively. Then, plasmids were separated by centrifugation and detected for R-spondin3 concentration. And the outcome was calculated by subtracting the R-spondin3 plasmid concentration of sample A from the R-spondin3 plasmid concentration of sample B, which was the change in plasma concentration of R-spondin3. | 3 hours |
| Change in Plasma Concentration of R-spondin4 | The venous blood samples were collected twice for each patient that the first time was around the onset of the mechanical ventilation and the second was 3rd hour after the onset of the mechanical ventilation, which were named as sample A and sample B relatively. Then, plasmids were separated by centrifugation and detected for R-spondin4 concentration. And the outcome was calculated by subtracting the R-spondin4 plasmid concentration of sample A from the R-spondin4 plasmid concentration of sample B, which was the change in plasma concentration of R-spondin4. |
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Inclusion Criteria:
Exclusion Criteria:
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patients undergo elective surgery
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| Name | Affiliation | Role |
|---|---|---|
| Lai Jiang, chief doctor | Xinhua Hospital affiliated to Medicine school,Shanghai Jiaotong University | Study Chair |
| Facility | Status | City | State | ZIP | Country | Contacts |
|---|---|---|---|---|---|---|
| Department of Anesthesia, Shanghai Xinhua hospital | Shanghai | Shanghai Municipality | 200082 | China |
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| ID | Title | Description |
|---|---|---|
| FG000 | Control／Mechanical Ventilation | venous blood samples collected from patients twice，relatively before mechanical ventilation and 3rd hour after mechanical ventilation |
| Title | Milestones | Reasons Not Completed | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Overall Study |
|
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| ID | Title | Description |
|---|---|---|
| BG000 | Control／Mechanical Ventilation | venous blood samples collected from patients twice，relatively before mechanical ventilation and 3rd hour after mechanical ventilation mechanical ventilation: mechanical ventilation protocol: tidal volume 6-8 ml/kg, positive end-expiratory pressure 5 cm h2o, oxygen concentration 40%; respiratory rate 10-15/min, inspiratory/expiratory ratio 1:1.5. |
| Units | Counts |
|---|---|
| Participants |
|
| Title | Description | Population Description | Parameter Type | Dispersion Type | Unit of Measure | Calculate Percentage | Denominator Units Selected | Denominators | Classes |
|---|---|---|---|---|---|---|---|---|---|
| Age, Categorical | Count of Participants |
| Type | Title | Description | Population Description | Reporting Status | Anticipated Posting Date | Parameter Type | Dispersion Type | Unit of Measure | Calculate Percentage | Time Frame | Units Analyzed | Denominator Units Selected | Arm/Group Information | Denominators | Classes | Analyses | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Primary | Change in Plasma Concentration of R-spondin 1 | The venous blood samples were collected twice for each patient that the first time was around the onset of the mechanical ventilation and the second was 3rd hour after the onset of the mechanical ventilation, which were named as sample A and sample B relatively. Then, plasmids were separated by centrifugation and detected for R-spondin1 concentration. And the outcome was calculated by subtracting the R-spondin1 plasmid concentration of sample A from the R-spondin1 plasmid concentration of sample B, which was the change in plasma concentration of R-spondin1. | Posted | Mean | Standard Deviation | pg/ml | 3 hours |
|
3 hours Explanation: The venous blood samples were collected twice for each patient that the first time was around the onset of the mechanical ventilation and the second was 3rd hour after the onset of the mechanical ventilation.
Samplings of 1 ml blood were performed twice per patient from peripheral venous catheter: the first just before endotracheal intubation and the second 3rd hour after that. Systematic monitoring, including electrocardiograph monitoring, brain electricity guardianship, blood gas，blood pressure, etc., was performed during surgery process. Patients responded normally with stable postoperative consciousness. No death, serious or other adverse events occurred during this process in surgical room.
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| ID | Title | Description | Deaths (Affected) | Deaths (At Risk) | Serious Events (Affected) | Serious Events (At Risk) | Other Events (Affected) | Other Events (At Risk) |
|---|---|---|---|---|---|---|---|---|
| EG000 | Control／Mechanical Ventilation | Venous blood samples were collected twice for each patient，relatively before onset of mechanical ventilation and 3rd hour after mechanical ventilation. |
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| Term | Organ System | Source Vocabulary | Assessment Type | Notes | Statistical Information |
|---|---|---|---|---|---|
| 0 | General disorders | Systematic Assessment |
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| Title | Organization | Phone | Extension | |
|---|---|---|---|---|
| Dr. Lai Jiang | Department of Anesthesia, Xinhua hospital affiliated to Shanghai Jiaotong University School of medicine | 021-25078999 | jianglaimz@sina.com |
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| Type | Includes Protocol | Includes SAP | Includes ICF | Document Label | Document Date | Document Uploaded Date | Document File Name |
|---|---|---|---|---|---|---|---|
| Prot_SAP | Yes | Yes | No | Study Protocol and Statistical Analysis Plan | Jul 20, 2017 | Oct 22, 2017 | Prot_SAP_002.pdf |
| ICF | No | No | Yes | Informed Consent Form | Jul 20, 2017 | Oct 22, 2017 | ICF_003.pdf |
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| ID | Term |
|---|---|
| D055371 | Acute Lung Injury |
| D055370 | Lung Injury |
| ID | Term |
|---|---|
| D008171 | Lung Diseases |
| D012140 | Respiratory Tract Diseases |
| D013898 | Thoracic Injuries |
| D014947 | Wounds and Injuries |
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| ID | Term |
|---|---|
| D012121 | Respiration, Artificial |
| ID | Term |
|---|---|
| D058109 | Airway Management |
| D013812 | Therapeutics |
| D012151 | Resuscitation |
| D004638 | Emergency Treatment |
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venous blood samples from patients undergo elective surgery with general anesthesia and mechanical ventilation
| 3 hours |
| Participants |
|
| Sex: Female, Male | Count of Participants | Participants |
|
| Race (NIH/OMB) | Count of Participants | Participants |
|
| Region of Enrollment | Number | participants |
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| Primary | Change in Plasma Concentration of R-spondin 2 | The venous blood samples were collected twice for each patient that the first time was around the onset of the mechanical ventilation and the second was 3rd hour after the onset of the mechanical ventilation, which were named as sample A and sample B relatively. Then, plasmids were separated by centrifugation and detected for R-spondin2 concentration. And the outcome was calculated by subtracting the R-spondin2 plasmid concentration of sample A from the R-spondin2 plasmid concentration of sample B, which was the change in plasma concentration of R-spondin2. | Posted | Mean | Standard Deviation | pg/ml | 3 hours |
|
|
|
| Primary | Change in Plasma Concentration of R-spondin3 | The venous blood samples were collected twice for each patient that the first time was around the onset of the mechanical ventilation and the second was 3rd hour after the onset of the mechanical ventilation, which were named as sample A and sample B relatively. Then, plasmids were separated by centrifugation and detected for R-spondin3 concentration. And the outcome was calculated by subtracting the R-spondin3 plasmid concentration of sample A from the R-spondin3 plasmid concentration of sample B, which was the change in plasma concentration of R-spondin3. | Posted | Mean | Standard Deviation | pg/ml | 3 hours |
|
|
|
| Primary | Change in Plasma Concentration of R-spondin4 | The venous blood samples were collected twice for each patient that the first time was around the onset of the mechanical ventilation and the second was 3rd hour after the onset of the mechanical ventilation, which were named as sample A and sample B relatively. Then, plasmids were separated by centrifugation and detected for R-spondin4 concentration. And the outcome was calculated by subtracting the R-spondin4 plasmid concentration of sample A from the R-spondin4 plasmid concentration of sample B, which was the change in plasma concentration of R-spondin4. | Posted | Mean | Standard Deviation | pg/ml | 3 hours |
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| 0 |
| 52 |
| 0 |
| 52 |
| 0 |
| 52 |
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| D012138 |
| Respiratory Therapy |