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Table 2 Summary of O2 only study characteristics

From: Effect of low-to-moderate hyperoxia on lung injury in preclinical animal models: a systematic review and meta-analysis

Author (y)

Country

Animals studied

Oxygen studied

Measures reported

Type (Strain)

Sex

Age

Wgt

FiO2

Duration

Hackney

(1975)

US

Monkey (Squirrel)

M

NR

NR

0.21, 0.60, 0.80

2, 4, 8d

Lung injurya, lung or systemic immune response parametersb

Hayatdavoudi (1981)

US

Rat (Charles River – CD)

M

NR

300–350 g

0.21, 0.60, 0.85

7d

Body weights; lung injury; lung or systemic immune response parameters; survival with FiO2 = 1.0 after prior lower FiO2 exposure

Rister

(1983)

Germany

Guinea pigs

NR

NR

NR

0.21, 0.30, 0.40, 0.50, 0.60, 0.70, 0.80

0, 18, 42, 60, 90 h

Lung injury

Coursin

(1987)

US

Rats

(SD)

M

NR

160–200 g

0.21, 0.50, 0.65, 0.80

7, 14, 21, 28, 42d

Body weights; lung injury; lung or systemic immune response parameters; Survival with FiO2 = 1.0 after prior lower FiO2 exposure

Holm

(1987)

US

Rabbits (NZW)

M

NR

1.9–2.2 kg

0.21, 0.60

21d

Lung injury; lung or systemic immune response parameters

Nickerson

(1990)

US

Rabbits

(NZW)

NR

NR

2.0–3.0 kg

0.21, 0.60

21d

Lung injury

Nylen

(1993)

US

Hamsters

(Syrian Gold)

M

6weeks

NR

0.21, 0.60

7, 21, 90d

Body weight; lung injury

Van Klaveren (1997)

Belgium, UK

Rats (Wistar)

M

NR

NR

0.21, 0.60, 0.85

7d

Body weight; lung injury; lung or systemic immune response parameters; survival

Belik

(2003)

Canada

Rats

(SD)

F

NR

250–275 g

0.21, 0.60

14d

Lung injury

Nelin

(2003)

US

Rats

(SD)

M

NR

250–325 g

0.21, 0.50, 0.90

2.5d

Body weight; lung injury; salicylate conversion to 2,3-DHBA to assess lung hydroxyl radical oxidant production

Hesse

(2004)

Germany

Mice

(C57BL6/J)

M

12–16 wk

26–27 g

0.21, 0.60, > 0.95

3d

Body weight; lung injury; lung or systemic immune response parameters; body weight; survival

Gan

(2011)

US

Rats

(SD)

M

NR

275–325 g

0.21, 0.60, 0.85

7d

Body weight; lung injury; lung or systemic immune response parameters

Audi

(2012)

US

Rats

(SD)

M

NR

300–325 g

0.21, 0.60, 0.95

60–7d

95–2d

Lung injury; lung or systemic immune response parameters

Lagishetty

(2014)

US

Mice

(C57BL/6 J)

M

9 weeks

NR

0.21, 0.50, 0.75, 1.0

3d

Lung injury; lung or systemic immune response parameters; lung tissue expression of 6 CLOCK proteins (CLOCK, Bmal1, Cry1, Cry2, Per1, Per2)

  1. F female, M male, MAC macrophage, NR not reported, NZW New Zealand White, SD Sprague–Dawley, UC unclear, US United States, UK United Kingdom, Wgt weight, Bmal1—CLOCK circadian locomotor output cycles kaput, 2,3-DHBA dihydroxy benzoic acid, GSH glutathione, HMPAQ Tc labele3d hexamethylpropyleneamine oxide (trapped in the lung by GSH), DEM GSH depleter diethyl maleate, GSH-glutathione GSSG-oxidized glutathione
  2. aLung injury measures included one or more of the following: arterial oxygen pressure; lung weights, lung wet to dry weight ratios, lung to body weight ratios; bronchoalveolar lavage (BAL) volume, cell, protein or albumin concentrations; alveolar permeability to solute; lung pressure/volume relationships, lung volumes, diffusion capacity; lung histologic changes; pulmonary artery and airway contractile and relaxation function, and/or alveolar macrophage and neutrophil microtubule and microfilament integrity, BAL type-2 cell dysfunction or phospholipid content
  3. bLung or systemic immune response parameters included one or more of the following: BAL cellularity and polymorphonuclear neutrophil cell numbers, BAL or lung tissue macrophages, BAL or lung tissue lymphocytes; BAL or serum cytokine, nitric oxide, or nitric oxide synthase levels; lung antioxidant activity which included HMPAQ retention with or without DEM based on lung to background ratio, lung or BAL glutathione peroxidase (GPx), glutathione (GSH), oxidized glutathione (GSSG), gamma-glutamyltransferase, non-protein-sulfhydral (NPSH), and/or superoxide dismutase (SOD) levels