Effect of Mechanical Ventilation on Plasma Concentration Level of R-spondin Proteins

the Change of R-spondin Proteins Plasma Concentration Level Caused by Mechanical Ventilation and Its Effect on Mechanical Ventilation 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.

Study Overview

• Status: Completed
• Conditions: Acute Lung Injury
• Intervention / Treatment: Other: mechanical ventilation

Detailed Description

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.

• Study Type: Observational
• Enrollment (Actual): 52

Contacts and Locations

Study Locations

• China
  • Shanghai
    • Shanghai, Shanghai, China, 200082
      • Department of Anesthesia, Shanghai Xinhua hospital

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 18 years to 60 years (Adult)
• Accepts Healthy Volunteers: No
• Genders Eligible for Study: All

• Sampling Method: Non-Probability Sample

Study Population

patients undergo elective surgery

Description

Inclusion Criteria:

• undergo elective surgery with mechanical ventilation lasting for > 3 hours; classified as physical status I to III according to the American Society of Anesthesiologists Physical Status Classification System; Written informed consent is approved.

Exclusion Criteria:

• chronic lung disease; recent lung infection; recent anaesthetics or mechanical ventilation treatment; hemodilution with massive fluid supply during surgery; children；women during pregnancy or lactation; being involved in other clinical subjects

Study Plan

How is the study designed?

Number of groups / cohorts

1

Cohorts and Interventions

Group / Cohort	Intervention / Treatment
control／mechanical ventilation; venous blood samples collected from patients twice，relatively before mechanical ventilation and 3rd hour after mechanical ventilation	Other: 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.

What is the study measuring?

Primary Outcome Measures

Outcome Measure	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.	3 hours

Collaborators and Investigators

• Sponsor: Xinhua Hospital, Shanghai Jiao Tong University School of Medicine

Study record dates

Study Major Dates

• Study Start (Actual): September 22, 2017
• Primary Completion (Actual): October 15, 2017
• Study Completion (Actual): October 31, 2017

Study Registration Dates

• First Submitted: October 16, 2017
• First Submitted That Met QC Criteria: October 16, 2017
• First Posted (Actual): October 20, 2017

Study Record Updates

• Last Update Posted (Actual): July 25, 2019
• Last Update Submitted That Met QC Criteria: May 22, 2019
• Last Verified: October 1, 2017

More Information

Terms related to this study

• Keywords: R-spondin proteins, mechanical ventilation, lung injury
• Additional Relevant MeSH Terms: Respiratory Tract Diseases; Lung Diseases; Wounds and Injuries; Thoracic Injuries; Acute Lung Injury; Lung Injury
• Other Study ID Numbers: XH-17-015

Plan for Individual participant data (IPD)

• Plan to Share Individual Participant Data (IPD)?: UNDECIDED

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: No
• Studies a U.S. FDA-regulated device product: No