Effect of R-spondin3 on Sepsis Induced Endothelial Dysfunction

the Mechanism of the Downregulation of R-spondin3 in Sepsis Induced Lung Injury

Sepsis is the most frequent risk factor for ALI/ARDS. Meanwhile, Pulmonary is the most vulnerable organ to fail in response to sepsis, vascular endothelial dysfunction is a central event in the pathophysiology of sepsis. An improved understanding of endothelial response and associated biomarkers may lead to strategies to more accurately predict outcome and develop novel endothelium-directed therapies in sepsis.

The human and mouse R-spondins encode a family of proteins that includes four paralogs (R-spo1-4). R-spondins are secreted proteins found primarily in the extracellular region and are known to promote β-catenin signaling. Among them, the embryonic lethal vascular remodeling phenotype of R-spondin3 (Rspo3) mutant mice suggests a role of EC derived Rspo3 in angiogenesis. Rspo3 protects tissues against mesenteric I/R by tightening endothelial cell junction and improving vascular intergrity. However, the role of Rspo3 in sepsis-induced pulmonary endothelial dysfunction remains unclear. Thus, it is worthwhile to explore the relationship between Rspo3 and sepsis-induced lung injury, which will be helpful for prevention and treatment of sepsis-induced lung injury and endothelial dysfunction.

Study Overview

• Status: Unknown
• Conditions: Acute Respiratory Distress Syndrome (ARDS); Acute Lung Injury (ALI)
• Intervention / Treatment: Other: sepsis

Detailed Description

Acute lung injury (ALI) or acute respiratory distress syndrome (ARDS), is a clinical problem induced by acute and excessive pulmonary inflammation. Sepsis is the most frequent risk factor for ALI/ARDS. Meanwhile, Pulmonary is the most vulnerable organ to fail in response to sepsis, and a major cause of death for sepsis patients is respiratory failure. Despite modern clinical practices in critical care medicine, there still remains a mortality rate as high as 45%. In addition, Vascular endothelial dysfunction is a central event in the pathophysiology of sepsis. Endothelial cell activation is associated with sepsis severity, organ dysfunction and mortality. An improved understanding of endothelial response and associated biomarkers may lead to strategies to more accurately predict outcome and develop novel endothelium-directed therapies in sepsis.

The human and mouse R-spondins encode a family of proteins that includes four paralogs (R-spo1-4). R-spondins are secreted proteins found primarily in the extracellular region and are known to promote β-catenin signaling. Among them, the embryonic lethal vascular remodeling phenotype of R-spondin3 (Rspo3) mutant mice suggests a role of EC derived Rspo3 in angiogenesis. Former studies demonstrated that endothelial Rspo3 enhances cell autonomous non-canonical Wnt signaling, thereby preventing retinal and tumor blood vessel regression and EC apoptosis. The mid-gestational lethality of Rspo3-ECKO mice indicated a role of EC-derived RSPO3 in controlling blood vessel remodeling. Furthermore, Rspo3 protects tissues against mesenteric I/R by tightening endothelial cell junction and improving vascular intergrity. However, the role of Rspo3 in sepsis-induced pulmonary endothelial dysfunction remains unclear. Thus, it is worthwhile to explore the relationship between Rspo3 and sepsis-induced lung injury.

In the present study, the investigators will analyze the expression of Rspo3 in septic patients and sepsis-induced lung injury models and explore whether Rspo3 could protect sepsis-associated lung injury, which will be helpful for prevention and treatment of sepsis-induced lung injury and endothelial dysfunction.

• Study Type: Observational
• Enrollment (Anticipated): 60

Contacts and Locations

• Study Contact: Name: Lai Jiang, chief doctor; Phone Number: +86-2125077821; Email: jianglai@xinhuamed.com.cn
• Study Contact Backup: Name: Hui Zhang, resident; Phone Number: +86-2125077821; Email: hui950315@sjtu.edu.cn

Study Locations

• China
  • Shanghai
    • Shanghai, Shanghai, China, 200082
      • Recruiting
      • Department of Anesthesia, Shanghai Xinhua hospital
      • Contact: Lai Jiang, chief doctor; Phone Number: +86-2125077821; Email: jianglai@xinhuamed.com.cn

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 18 years and older (Adult, Older Adult)
• Accepts Healthy Volunteers: No
• Genders Eligible for Study: All

• Sampling Method: Non-Probability Sample

Study Population

septic patients

Description

Inclusion Criteria:

• patients with sepsis defined as SIRS combined with an infectious episode and dysfunction of one or more organ
• age older than 18 years

SIRS is considered to be present when patients have more than one of the following clinical findings:

• Body temperature higher than 38°C or lower than 36°C;
• Heart rate higher than 90/min
• Hyperventilation evidenced by respiratory rate higher than 20/min or PaCO2 lower than 32 mmHg;
• White blood cell count higher than 12,000 cells/ µl or lower than 4,000/ µl.

Exclusion Criteria:

• patients younger than 18
• women during pregnancy or lactation; being involved in other clinical subjects.

Study Plan

How is the study designed?

Design Details

• Observational Models: Cohort
• Time Perspectives: Prospective

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Change in Plasma Concentration of R-spondin 3	The venous blood samples were collected from septic patients after the onset of the sepsis, plasma were separated by centrifugation and detected for R-spondin3 concentration.	after initiation of sepsis within 24 hours

Collaborators and Investigators

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

Study record dates

Study Major Dates

• Study Start (Actual): July 8, 2020
• Primary Completion (Anticipated): August 8, 2021
• Study Completion (Anticipated): December 12, 2021

Study Registration Dates

• First Submitted: August 19, 2020
• First Submitted That Met QC Criteria: September 6, 2020
• First Posted (Actual): September 14, 2020

Study Record Updates

• Last Update Posted (Actual): September 14, 2020
• Last Update Submitted That Met QC Criteria: September 6, 2020
• Last Verified: July 1, 2020

More Information

Terms related to this study

• Keywords: sepsis; ALI; Rspondin3
• Additional Relevant MeSH Terms: Pathologic Processes; Infections; Respiratory Tract Diseases; Respiration Disorders; Lung Diseases; Systemic Inflammatory Response Syndrome; Inflammation; Wounds and Injuries; Infant, Newborn, Diseases; Infant, Premature, Diseases; Thoracic Injuries; Sepsis; Respiratory Distress Syndrome; Respiratory Distress Syndrome, Newborn; Acute Lung Injury; Lung Injury
• Other Study ID Numbers: XHEC-C-2020-084

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