Associate Professor Alexander Larcombe

Mouse Lung Structure and Function after Long-Term Exposure to an Atmospheric Carbon Dioxide Level Predicted by Climate Change Modeling

Climate change models predict that atmospheric carbon dioxide [CO2] levels will be between 700 and 900 ppm within the next 80yrs. In this study we aimed to assess the respiratory structure and function effects of long-term exposure to 890ppm CO2 from preconception to adulthood using a mouse model.

Exposomes and metabolic health through a physical activity lens: a narrative review

In this narrative review, we provide an overview of the role of physical activity as part of differing exposomes (our combined non-genetic exposures from conception onwards) and environmental influences on metabolic health. We discuss 'beneficial' exposomes (green/natural outdoor spaces, sun exposure, healthy diets and features of built environments) that could synergise with physical activity to prevent metabolic dysfunction, particularly that related to lifestyle diseases of obesity, type 2 diabetes and metabolic syndrome.

Editorial overview: The physiology of the diseased lung

IRF7-Associated Immunophenotypes Have Dichotomous Responses to Virus/Allergen Coexposure and OM-85-Induced Reprogramming

High risk for virus-induced asthma exacerbations in children is associated with an IRF7lo immunophenotype, but the underlying mechanisms are unclear. Here, we applied a Systems Biology approach to an animal model comprising rat strains manifesting high versus low susceptibility to experimental asthma, induced by virus/allergen coexposure, to elucidate the mechanism(s)-of-action of the high-risk asthma immunophenotype.

Fuel feedstock determines biodiesel exhaust toxicity in a human airway epithelial cell exposure model

Biodiesel is promoted as a sustainable replacement for commercial diesel. Biodiesel fuel and exhaust properties change depending on the base feedstock oil/fat used during creation. The aims of this study were, for the first time, to compare the exhaust exposure health impacts of a wide range of biodiesels made from different feedstocks and relate these effects with the corresponding exhaust characteristics.

Previous Influenza Infection Exacerbates Allergen Specific Response and Impairs Airway Barrier Integrity in Pre-Sensitized Mice

In this study we assessed the effects of antigen exposure in mice pre‐sensitized with allergen following viral infection on changes in lung function, cellular responses and tight junction expression.

Phage therapy for multi-drug resistant respiratory tract infections

The emergence of multi-drug resistant (MDR) bacteria is recognised today as one of the greatest challenges to public health. As traditional antimicrobials are becoming ineffective and research into new antibiotics is diminishing, a number of alternative treatments for MDR bacteria have been receiving greater attention. Bacteriophage therapies are being revisited and present a promising opportunity to reduce the burden of bacterial infection in this post-antibiotic era.

Chemical analysis of fresh and aged Australian e-cigarette liquids

To assess the chemical composition of electronic cigarette liquids (e-liquids) sold in Australia, in both their fresh and aged forms. Design, setting: Gas chromatography–mass spectrometry analysis of commercial e-liquids sold in Australia (online and physical stores).

Long-term exposure of mice to 890 ppm atmospheric CO2 alters growth trajectories and elicits hyperactive behaviours in young adulthood

Atmospheric carbon dioxide (CO2) levels are currently at 418 parts per million (ppm), and by 2100 may exceed 900 ppm. The biological effects of lifetime exposure to CO2 at these levels is unknown. Previously we have shown that mouse lung function is altered by long-term exposure to 890 ppm CO2. Here, we assess the broader systemic physiological responses to this exposure.

What doctors should consider before prescribing e-liquids for e-cigarettes

Pharmacological ablation of the airway smooth muscle layer—Mathematical predictions of functional improvement in asthma

Findings provide further proof of concept that pharmacological targeting of airway smooth muscle thickness will be beneficial and may be facilitated by azithromycin

The Evolving Landscape of e-Cigarettes: A Systematic Review of Recent Evidence

This review focuses on smokers and nonsmokers and evaluates the most recent data regarding the potential health effects of e-cigarettes

Editorial overview: Endocrine and metabolic adaptations to extreme environments: Living life to the extreme – insights into the limits of life and transitions to disease

The need to understand responses to extreme environments has prompted this edition of Current Opinion in Endocrine and Metabolic Research

Maternal high fat diet compromises survival and modulates lung development of offspring, and impairs lung function of dams

While maternal high fat diet compromised litter survival, it also promoted somatic and lung growth (increased lung volume) in the offspring

Nicotine and other potentially harmful compounds in "nicotine-free" e-cigarette liquids in Australia

The aim of our investigation was to assess the chemical composition of a range of e-liquids available in Australia, focusing on nicotine and other potentially harmful compounds

Mechanical Abnormalities of the Airway Wall in Adult Mice After Intrauterine Growth Restriction

We propose that mechanical abnormalities of the airway wall acquired through disrupted fetal growth impact susceptibility to disease

Soy Biodiesel Exhaust is More Toxic than Mineral Diesel Exhaust in Primary Human Airway Epithelial Cells

Exposure to biodiesel exhaust resulted in significantly greater cell death and a greater release of immune mediators compared to both air controls and ULSD exhaust

Early-life exposure to electronic cigarettes: cause for concern

There are a multitude of ways that, with respect to early-life exposures and health, electronic nicotine delivery systems are a cause for concern

Confounding effects of gavage in mice: Impaired respiratory structure and function

It is therefore clear that gavage can have significant impacts on experimental animals in terms of their stress response and overall morbidity and mortality

Transplacental immune modulation with a bacterial-derived agent protects against allergic airway inflammation

These data provide proof of concept supporting the rationale for developing transplacental immune reprogramming approaches for primary disease prevention

Effects of human rhinovirus on epithelial barrier integrity and function in children with asthma

This study demonstrates novel intrinsic differences in tight junctions gene and protein expression between airway epithelial cells of children with and without asthma

Visualisation of Multiple Tight Junctional Complexes in Human Airway Epithelial Cells

Apically located tight junctions in airway epithelium perform a fundamental role in controlling macromolecule migration through paracellular spaces.

Independent and combined effects of airway remodelling and allergy on airway responsiveness

There was a positive relationship between the thickness of the airway smooth muscle layer with airway responsiveness, which was shifted upward in the presence of allergy

Fragranced consumer products: effects on asthmatic Australians

Most asthmatics would prefer workplaces, healthcare facilities, and environments that are fragrance-free, which could help reduce adverse effects

Foetal growth restriction in mice modifies postnatal airway responsiveness in an age and sex-dependent manner

Our data demonstrate changes in airway responsiveness as a result of intrauterine growth restriction that could influence susceptibility to asthma development

Optical coherence tomography-based contact indentation for diaphragm mechanics in a mouse model of transforming growth factor alpha induced lung disease

This study tested the utility of optical coherence tomography-based indentation to assess mechanical properties of respiratory tissues in disease

The effects of electronic cigarette aerosol exposure on inflammation and lung function in mice

This study shows, for the first time, that exposure to e-cigarette aerosol during adolescence and early adulthood is not harmless to the lungs and can result in significant impairments in lung function.

Vitamin D supplementation of initially vitamin D-deficient mice diminishes lung inflammation with limited effects on pulmonary epithelial integrity

In disease settings, vitamin D may be important for maintaining optimal lung epithelial integrity and suppressing inflammation, but less is known of its effects prior to disease onset.

Increased heterogeneity of airway calibre in adult rats after hypoxia-induced intrauterine growth restriction

The rat model demonstrates that intrauterine growth restriction leads to a more heterogeneous distribution of airway lumen calibre in adulthood

Effect of human rhinovirus infection on airway epithelium tight junction protein disassembly and transepithelial permeability

HRV-1B infection directly alters human airway epithelial TJ expression leading to increased epithelial permeability potentially via antiviral response of IL-15

Biodiesel exhaust-induced cytotoxicity and proinflammatory mediator production in human airway epithelial cells

Canola biodiesel exhaust exposure elicits inflammation and reduces viability of human epithelial cell cultures in vitro when compared with ULSD exhaust exposure

Early life rhinovirus infection exacerbates house-dust-mite induced lung disease more severely in female mice

Early life rhinovirus infection influences the development of house-dust-mite induced lung disease in female, but not male mice

Biodiesel exhaust: The need for a systematic approach to health effects research

Biodiesel is a generic term for fuel that can be made from virtually any plant or animal oil via transesterification of triglycerides with an alcohol...

Influence of gestational age on dead space and alveolar ventilation in preterm infants ventilated with volume guarantee

Ventilated preterm infant lungs are vulnerable to overdistension and underinflation.

Respiratory toxicology of e-cigarettes: effect of vapours on lung function and inflammation

Electronic cigarettes (ECs) have been rapidly gaining ground on conventional cigarettes due to their efficiency in ceasing or reducing tobacco consumption,...

Persistent and compartmentalised disruption of dendritic cell subpopulations in the lung following influenza A virus infection

Immunological homeostasis in the respiratory tract is thought to require balanced interactions between networks of dendritic cell (DC) subsets in lung...

House dust mite induced lung inflammation does not alter circulating vitamin D levels

We hypothesized that allergic inflammation decreases the level of circulating 25(OH)D and tested this using a mice model of house dust mite (HDM) induced...

Biodiesel exhaust-induced cytotoxicity and proinflammatory mediator production in human airway epithelial cells

Our results show that canola biodiesel exhaust exposure elicits inflammation and reduces viability of human epithelial cell cultures in vitro when compared...

Route of exposure alters inflammation and lung function responses to diesel exhaust

In this study, we compared the physiological consequences of short-term exposure to diesel exhaust via inhalation to those due to exposure to the same diesel...

Rhinovirus exacerbates house-dust-mite induced lung disease in adult mice

In this study, we combined human-rhinovirus infection with a clinically relevant mouse model of aero-allergen exposure using house-dust-mite in an attempt to...

The effect of diesel exhaust exposure on blood-brain barrier integrity and function in a murine model

Epidemiological studies indicate that exposure to diesel exhaust (DE) is associated with vascular-based disorders.

Early life arsenic exposure and acute and long-term responses to influenza A infection in mice

Exposure to arsenic in early life has been shown to increase the rate of respiratory infections during infancy, reduce childhood lung function, and increase...

The influence of moving walls on respiratory aerosol deposition modelling

This work initially examines particle deposition in a Weibull-type geometry, comparing traditional computational fluid dynamics approaches with a novel...

In utero exposure to low dose arsenic via drinking water impairs early life lung mechanics in mice

All alterations to lung mechanics following in utero arsenic exposure were recovered by adulthood.

In utero exposure to arsenic alters lung development and genes related to immune and mucociliary function in mice

In utero exposure to arsenic via drinking water increases the risk of lower respiratory tract infections during infancy and mortality from bronchiectasis in...

Factors influencing the assessment of lung function in mice with influenza-induced lung disease

The constant-phase model (CPM) is commonly fit to respiratory system input impedance (Z rs) to estimate lung mechanics.

The mechanism of deep inspiration-induced bronchoprotection: Evidence from a mouse model

In healthy individuals, deep inspirations (DIs) taken prior to a bronchial challenge reduce the bronchoconstrictor response, which is termed...

Acute diesel exhaust particle exposure increases viral titre and inflammation associated with existing influenza

Exposure to diesel exhaust particles (DEP) is thought to exacerbate many pre-existing respiratory diseases.

Defective aeroallergen surveillance by airway mucosal dendritic cells as a determinant of risk

A hallmark of atopic asthma is development of chronic airways hyper-responsiveness (AHR) that persists in the face of ongoing exposure to perennial...

Sensitizing and Th2 Adjuvant Activity of Cysteine Protease Allergens

Here, we report on a model that does not use Th2-skewing adjuvants and yet achieves sensitization solely via the nasal mucosa.

Physiological and inflammatory responses in an anthropomorphically relevant model of acute diesel exhaust particle exposure are sex and dose-dependent

Diesel exhaust particles (DEP) are an important contributor to suspended particulate matter (PM) in urban areas. While epidemiological evidence exists for a...

Sexual dimorphism in lung function responses to acute influenza A infection

Males are generally more susceptible to respiratory infections; however, there are few data on the physiological responses to such infections in males and...

In utero cigarette smoke exposure impairs somatic and lung growth in BALB/c mice

The aim of this study was to assess whether in utero tobacco smoke exposure alone affects early-life lung growth and development. Pregnant BALB/c mice...

Boosting airway T-regulatory cells by gastrointestinal stimulation as a strategy for asthma control

The hallmark of atopic asthma is transient airways hyperresponsiveness (AHR) preceded by aeroallergen-induced Th-cell activation.

Self-citation in American Physiological Society Journals

This study investigates the incidence of self-citation (authors citing their own work) for scholarly articles in ten journals published by the American...