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Quantitative GPCR and ion channel transcriptomics in primary alveolar macrophages and macrophage surrogates
Paul J Groot-Kormelink1, Lindsay Fawcett, Paul D Wright
1Respiratory Disease Area, Novartis Institutes for Biomedical Research, Horsham, UK.
Background:
Alveolar macrophages are one of the first lines of defence against invading pathogens and play a central role in modulating both the innate and acquired immune systems. By responding to endogenous stimuli within the lung, alveolar macrophages contribute towards the regulation of the local inflammatory microenvironment, the initiation of wound healing and the pathogenesis of viral and bacterial infections. Despite the availability of protocols for isolating primary alveolar macrophages from the lung these cells remain recalcitrant to expansion in-vitro and therefore surrogate cell types, such as monocyte derived macrophages and phorbol ester-differentiated cell lines (e.g. U937, THP-1, HL60) are frequently used to model macrophage function.
Methods:
The availability of high throughput gene expression technologies for accurate quantification of transcript levels enables the re-evaluation of these surrogate cell types for use as cellular models of the alveolar macrophage. Utilising high-throughput TaqMan arrays and focussing on dynamically regulated families of integral membrane proteins, we explore the similarities and differences in G-protein coupled receptor (GPCR) and ion channel expression in alveolar macrophages and their widely used surrogates.
Results:
The complete non-sensory GPCR and ion channel transcriptome is described for primary alveolar macrophages and macrophage surrogates. The expression of numerous GPCRs and ion channels whose expression were hitherto not described in human alveolar macrophages are compared across primary macrophages and commonly used macrophage cell models. Several membrane proteins known to have critical roles in regulating macrophage function, including CXCR6, CCR8 and TRPV4, were found to be highly expressed in macrophages but not expressed in PMA-differentiated surrogates.
Conclusions:
The data described in this report provides insight into the appropriate choice of cell models for investigating macrophage biology and highlights the importance of confirming experimental data in primary alveolar macrophages.
Insights
Primary alveolar macrophages are crucial immune cells, but difficult to expand in vitro. This study compares their gene expression to common cell models, finding key differences in important membrane proteins.
Area of Science:
- Immunology
- Cell Biology
- Genomics
Background:
- Alveolar macrophages are critical for lung immunity and host defense against pathogens.
- In vitro expansion of primary alveolar macrophages is challenging, necessitating the use of surrogate cell models.
- Surrogate models like monocyte-derived macrophages and differentiated cell lines are frequently employed to study macrophage function.
Purpose of the Study:
- To re-evaluate commonly used surrogate cell types as models for primary alveolar macrophages.
- To compare the G-protein coupled receptor (GPCR) and ion channel expression profiles between primary alveolar macrophages and surrogate models.
- To identify discrepancies in membrane protein expression that may impact the validity of surrogate models.
Main Methods:
- Utilized high-throughput TaqMan arrays for accurate transcript quantification.
- Focused on dynamically regulated families of integral membrane proteins, specifically GPCRs and ion channels.
- Compared gene expression profiles between primary human alveolar macrophages and commonly used macrophage cell lines (e.g., U937, THP-1, HL60).
Main Results:
- The complete non-sensory GPCR and ion channel transcriptome was characterized for both primary alveolar macrophages and surrogate models.
- Identified numerous GPCRs and ion channels with previously undescribed expression in human alveolar macrophages.
- Found significant differences in expression for key macrophage function-related membrane proteins, such as CXCR6, CCR8, and TRPV4, which were highly expressed in primary macrophages but absent in PMA-differentiated surrogates.
Conclusions:
- The study provides crucial insights into selecting appropriate cell models for macrophage biology research.
- Highlights the necessity of validating experimental findings in primary alveolar macrophages due to significant differences in surrogate models.
- Emphasizes the importance of understanding transcriptomic differences for accurate interpretation of macrophage function studies.
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