Abstract
Vascular endothelial growth factor (VEGF) is important for lung development and function but ideal mouse models are limited to decipher the quantitative relationship between VEGF expression levels and its proper development and pathogenesis. Human SPC promoter has been used to faithfully express genes or cDNAs in the pulmonary epithelium in many transgenic mouse models. In the study, a mouse model of lung-specific and reversible VEGF repression (hspc-rtTRtg/+/VegftetO/tetO) was generated. Human SPC promoter was used to drive lung-specific rtTR expression, a cDNA coding for doxycycline-regulated transcription repression protein. By crossing with VegftetO/tetO mice, that has tetracycline operator sequences insertion in 5′-UTR region, it allows us to reversibly inhibit lung VEGF transcription from its endogenous level through doxycycline food, water or injection. The tissue-specific inhibition of VEGF is used to mimic abnormal expression levels of VEGF in lung. Reduced VEGF expression in lung is confirmed by quantitative real time PCR and immunoblotting. Lung development and structure was analyzed by histology analysis and found significantly affected under low VEGF. The pulmonary epithelium and alveolarization are found abnormal with swelling alveolar septum and enlargement of air space. Genome-wide gene expression analysis identified that immune activities are involved in the VEGF-regulated lung functions. The transgenic mouse model can be used to mimic human pulmonary diseases. The mouse model confirms the important regulatory roles of epithelial expressed VEGF in lung development and function. This mouse model is valuable for studying VEGF-regulated lung development, pathogenesis and drug screening under low VEGF expression.
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Abbreviations
- VEGF:
-
Vascular endothelial growth factor
- VEGFA:
-
Vascular endothelial growth factor A
- VEGFR1:
-
Vascular endothelial growth factor receptor1
- VEGFR2:
-
Vascular endothelial growth factor receptor2
- Flt-1:
-
Fms like tryosyl kinase-1
- Flk-1/KDR:
-
Fetal liver kinase-1/kinase domain-containing receptor
- TetO:
-
Tetracycline operator
- TetR:
-
Tetracycline repressor
- Dox:
-
Doxycycline
- HSP-C:
-
Human surfactant protein C
- CD5L:
-
Cyclin-dependent kinase-like 5
- WDR49:
-
WD Repeat Domain 49
- LIPF:
-
Lipase F, gastric type
- CNTN1:
-
Contactin 1
- Mup10:
-
Major urinary protein 10
- KCNH4:
-
Potassium Voltage-Gated Channel Subfamily H member 4
- SOX10:
-
SRY-box transcription factor 10
- Gbp2b:
-
Guanylate binding protein 2b
- ARSI:
-
Arylsulfatase family member I
- Fam2051:
-
Family with sequence similarity 205 Member A)
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Acknowledgments
Authors would like to thank Ms. Xiulu Lu and Huiyan Wu for microinjection and mouse colony management.
Funding
This study is supported by National Natural Science Foundation of China (81270953), the Natural Science Foundation of Jilin Province (20160101344JC) and Science and Technology Project of Jilin Provincial Education Department (JJKH20180023KJ).
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Conceptualization: YZ; Data curation: MZZM, JJ, ZMO, SA; Formal analysis: MZZM, RKS, SA; Funding acquisition: XF, and YZ; Investigation; MZZM, JJ, YC, SA, ZMO, FH; Methodology: MZZM, JJ, YC, YZ; Project administration: YZ; Resources: XF, and YZ; Software: MZZM, RKS; Supervision: LZ, XF, and YZ; Validation: MZZM, JJ, YZ; Visualization: HH, FH, NB, MKC; Writing—original draft preparation: MZZM, JJ; Writing—review and editing: LZ, XF, and YZ.
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May Zun Zaw Myint and Jia Jia have contributed equally to this work.
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Myint, M.Z.Z., Jia, J., Adlat, S. et al. Effect of low VEGF on lung development and function. Transgenic Res 30, 35–50 (2021). https://doi.org/10.1007/s11248-020-00223-w
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DOI: https://doi.org/10.1007/s11248-020-00223-w