Abstract
ErbB4 receptor and thyroid transcription factor (TTF)-1 are important modulators of fetal alveolar type II (ATII) cell development and injury. ErbB4 is an upstream regulator of TTF-1, promoting its expression in MLE-12 cells, an ATII cell line. Both proteins are known to promote surfactant protein-B gene (SftpB) and protein (SP-B) expression, but their feedback interactions on each other are not known. We hypothesized that TTF-1 expression has a feedback effect on ErbB4 expression in an in-vitro model of isolated mouse ATII cells. We tested this hypothesis by analyzing the effects of overexpressing HER4 and Nkx2.1, the genes of ErbB4 and TTF-1 on TTF-1 and ErbB4 protein expression, respectively, as well as SP-B protein expression in primary fetal mouse lung ATII cells. Transient ErbB4 protein overexpression upregulated TTF-1 protein expression in primary fetal ATII cells, similarly to results previously shown in MLE-12 cells. Transient TTF-1 protein overexpression down regulated ErbB4 protein expression in both cell types. TTF-1 protein was upregulated in primary transgenic ErbB4-depleted adult ATII cells, however SP-B protein expression in these adult transgenic ATII cells was not affected by the absence of ErbB4. The observation that TTF-1 is upregulated in fetal ATII cells by ErbB4 overexpression and also in ErbB4-deleted adult ATII cells suggests additional factors interact with ErbB4 to regulate TTF-1 levels. We conclude that the interdependency of TTF-1 and ErbB4 is important for surfactant protein levels. The interactive regulation of ErbB4 and TTF-1 needs further elucidation.
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Abbreviations
- ATII cells:
-
Alveolar type II cells
- BPD:
-
Bronchopulmonary dysplasia
- RDS:
-
Respiratory distress syndrome of the neonate
- ErbB4:
-
Receptor tyrosine-protein kinase
- HER4 :
-
Human ErbB4 encoding gene
- TTF-1:
-
Thyroid transscription factor 1
- Nkx2.1 :
-
TTF-1 encoding gene
- SP-B:
-
Surfactant protein B
- SftpB :
-
SP-B encoding gene
- 4ICD:
-
ErbB4 intracellular domain
- MLE-12:
-
Mouse lung epithelium 12 cell line
- BSA:
-
Bovine serum albumin
- DMEM:
-
Dulbecco’s modified eagle medium
- FBS:
-
Fetal bovine serum
- E:
-
Embryonic day
- HBSS:
-
Hank’s buffered salt solution
- PBS:
-
Phosphate buffered saline solution
- HER4heart(−/−):
-
Homozygote ErbB4 negative transgene
- HER4heart(+/-):
-
Heterozygote transgene
- EGFP:
-
Enhanced green fluorescent protein
- HITES:
-
Hydrocortisone, insulin, transferrin, estrogen and selenium
- BCA:
-
Bicinchoninic acid
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Acknowledgements
We thank Drs. M. Gassmann and C. Birchmeier for providing the HER4heart mouse line. The studies were funded by NIH NHLBI R01 HL085648, HL037930, and Hannover Medical School.
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The authors have no conflicts of interest.
Authors’ contributions
Elger Marten - experimental design, data generation and analysis, manuscript preparation; Heber Nielsen - experimental design, manuscript preparation; Christiane Dammann - experimental design, manuscript preparation.
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Supplemental Figure 1
HER4heart transgenic mice are rescued from their lethal cardiac defect by the α-myosin heavy chain (MHC) promotor resulting in ErbB4 gene expression exclusively in the heart. (A) This cardiac rescue construct (upper blot) was detected by PCR in all mice containing at least one ErbB4-mutated allele. The mutated allele itself was detected at 320 bp and the wild type allele at 150 bp (lower blot). Representative samples of heterozygous (+/−), homozygous wild type (+/+) and homozygous ErbB4 mutated (−/−) mice are shown. (B) Representative Western blots of lung fibroblast homogenates of heterozygous (−/+) and homozygous (−/−) transgenic HER4heart mice confirmed that there is no pulmonary ErbB4 protein expression in ErbB4 −/− animals. β-actin reprobing was used to control for protein loading. (GIF 87 kb)
Supplemental Figure 2
Transfection efficiency in MLE-12 cells (A) and primary fetal ATII cells (B). Fluorescence-labeled EGFP constructs were used to identify transfection cells. The transfection efficiency was about 30–40 % in MLE-12 cells and about 20 % in primary fetal ATII cells. DAPI staining was used to identify total cell numbers. (GIF 46 kb)
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Marten, E., Nielsen, H.C. & Dammann, C.E.L. Interdependent TTF1 - ErbB4 interactions are critical for surfactant protein-B homeostasis in primary mouse lung alveolar type II cells. J. Cell Commun. Signal. 9, 207–215 (2015). https://doi.org/10.1007/s12079-015-0299-1
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DOI: https://doi.org/10.1007/s12079-015-0299-1