Thymosin β4 is not required for embryonic viability or vascular development.
BACKGROUND
Rossdeutsch et al describe a requirement for thymosin β4 (Tβ4) in vascular development. Impaired mural cell migration, differentiation, partial embryonic lethality, and hemorrhaging were observed after analysis of 2 lines of mice, one of which was germline null for Tβ4 and another in which Tβ4 was knocked down by endothelial-specific expression of Tβ4 short hairpin RNA. These data are in direct contrast to our published global and cardiac-specific Tβ4-knockout lines. Thus, the role of Tβ4 needs to be clarified to understand its importance in cardiovascular development.


OBJECTIVE
To investigate and clarify the role of Tβ4 in vascular smooth muscle cell development and vessel stability.


RESULTS
Examination of Tβ4 global knockouts did not demonstrate embryonic hemorrhaging, altered mural cell development, or lethality. Endothelial-specific knockouts also did not exhibit any embryonic lethality and were viable to adulthood.


CONCLUSIONS
Analysis of our Tβ4 global and cardiac- and endothelial-specific knockout models demonstrated that Tβ4 is dispensable for embryonic viability and vascular development.
Department of Medicine, University of California San Diego, La Jolla, CA 92093, USA.
Indroneal
I
Banerjee
Thomas
T
Moore Morris
Sylvia M
SM
Evans
Ju
J
Chen
D000818:Animals; D015415:Biomarkers / Q000378:metabolism; D002470:Cell Survival; D004622:Embryo, Mammalian / Q000098:blood supply / Q000378:metabolism; D042783:Endothelial Cells / Q000378:metabolism*; D018507:Gene Expression Regulation, Developmental; D005838:Genotype; D005865:Gestational Age; D051379:Mice; D008810:Mice, Inbred C57BL; D018345:Mice, Knockout; D009131:Muscle, Smooth, Vascular / Q000196:embryology / Q000378:metabolism*; D032389:Myocytes, Smooth Muscle / Q000378:metabolism*; D010641:Phenotype; D013947:Thymosin / Q000172:deficiency / Q000235:genetics / Q000378:metabolism*; D000099201:Thymosin beta(4)
D015415:Biomarkers; D013947:Thymosin; D000099201:Thymosin beta(4)