the Effect of Dopamine on Mechanical Ventilation Induced Lung Injury

the Mechanism of the Downregulation of Dopamine Receptor in Mechanical Ventilation Induced Lung Injury

Dopamine(DA) is a common neurotransmitter that has been known to regulate behavior, movement, cardiovascular，endocrine and gastrointestinal functions, but also functions as an important molecule engaging in the immune systems to possess anti-inflammatory effects. However, its role in ventilator-induced lung injury (VILI) is still unclear. Herein, this study aimed to investigate the therapeutic efficacy of dopamine on ventilation-induced lung endothelial barrier dysfunction and explore the possible underlying molecular mechanisms.

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 at high tidal volumes 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 (VILI), 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 VILI.

Dopamine is a neurotransmitter, which can also be produced outside the central nervous system. Lung alveolar epithelial cells represent an important source of extraneuronal dopamine, which has a significant role in local organ physiology. Dopamine D1 receptor (DRD1) and D2 receptor (DRD2) are present in lung tissues. Activation of D2DR induces NaKATPase gene expression. Moreover, activation of DRD1 results in the trafficking of NaKATPase to the basolateral membrane of type II alveolar epithelial cells, thus increasing lung liquid clearance during acute lung injury. Although the lung-protective effects of DA and its implication in the pathology of ALI are emerging, the mechanisms are still largely unknown.

In the present study, the investigators will analyze the influence of mechanical ventilation on dopamine receptors in the lung tissue of the participants, and explore whether DA could protect ventilation induced lung injury, which is helpful for prevention and treatment of ventilation induced lung injury.

• Study Type: Observational
• Enrollment (Actual): 46

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 lobectom

Description

Inclusion Criteria:

• Patients inclusion criteria: undergo elective lobectomy with general anesthesia and mechanical ventilation; 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:

• Distant metastases: recent anaesthetics or mechanical ventilation treatment；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
ventilation; patients undergoing selective operation with general anesthesia(GA) and mechanical ventilation(MV)	Other: mechanical ventilation; mechanical ventilation protocol: tidal volume 6-8 ml/kg, positive end-expiratory pressure 5 cmH2O, 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
Correlation Coefficient (r) Between Duration of Mechanical Ventilation and DRD1 Expression	ImageJ software were used to get the Integrated Optical Density(IOD) of the chemiluminescent signal from the membranes of dopamine receptor 1(DRD1). The normalization was carried out by DRD1 IOD/total β-actin IOD for sample loading correction. In determination of the expression level of DRD1 in different time points, the investigators had a bulk preparation of normal placental protein which was set as a control. Analyze the correlation between duration of mechanical ventilation and DRD1 expression. If p value is less than 0.05, then its change is statically significant.	20min-60min

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Correlation Coefficient (r) Between Duration of Mechanical Ventilation and DRD2 Expression	ImageJ software were used to get the Integrated Optical Density(IOD) of the chemiluminescent signal from the membranes of dopamine receptor 2(DRD2). The normalization was carried out by DRD2 IOD/total β-actin IOD for sample loading correction. In determination of the expression level of DRD2 in different time points, the investigators had a bulk preparation of normal placental protein which was set as a control. Analyze the correlation between duration of mechanical ventilation and DRD2 expression. If p value is less than 0.05, then its change is statically significant.	20min-60min
the Expression of TH in Lung Tissues	ImageJ software were used to get the Integrated Optical Density(IOD) of the chemiluminescent signal from the membranes of Tyrosine hydroxylase(TH). The normalization was carried out by TH IOD/total β-actin IOD for sample loading correction. In determination of the expression level of TH in different time points, the investigators had a bulk preparation of normal placental protein which was set as a control. Analyze the correlation between duration of mechanical ventilation and TH expression. If p value is less than 0.05, then its change is statically significant.	20min-60min
the Expression of DDC in Lung Tissues	ImageJ software were used to get the Integrated Optical Density(IOD) of the chemiluminescent signal from the membranes of Dopa decarboxylase(DDC). The normalization was carried out by DDC IOD/total β-actin IOD for sample loading correction. In determination of the expression level of DDC in different time points, the investigators had a bulk preparation of normal placental protein which was set as a control. Analyze the correlation between duration of mechanical ventilation and DDC expression. If p value is less than 0.05, then its change is statically significant.	20min-60min
the Expression of Ac-a-tubulin in Lung Tissues	ImageJ software were used to get the Integrated Optical Density(IOD) of the chemiluminescent signal from the membranes of acetylated-a-tubulin(Ac-a-tubulin). The normalization was carried out by Ac-a-tubulin IOD/total β-actin IOD for sample loading correction. In determination of the expression level of Ac-a-tubulin in different time points, the investigators had a bulk preparation of normal placental protein which was set as a control. Analyze the correlation between duration of mechanical ventilation and Ac-a-tubulin expression. If p value is less than 0.05, then its change is statically significant.	20min-60min

Collaborators and Investigators

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

Study record dates

Study Major Dates

• Study Start (Actual): March 20, 2017
• Primary Completion (Actual): October 22, 2017
• Study Completion (Actual): December 1, 2017

Study Registration Dates

• First Submitted: July 17, 2017
• First Submitted That Met QC Criteria: October 19, 2017
• First Posted (Actual): October 23, 2017

Study Record Updates

• Last Update Posted (Actual): October 22, 2018
• Last Update Submitted That Met QC Criteria: December 27, 2017
• Last Verified: March 1, 2017

More Information

Terms related to this study

• Keywords: dopamine,mechanical ventilation,lung injury
• Additional Relevant MeSH Terms: Respiratory Tract Diseases; Lung Diseases; Thoracic Injuries; Wounds and Injuries; Acute Lung Injury; Lung Injury
• Other Study ID Numbers: XH-17-011

Drug and device information, study documents

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