PMID- 32510325 OWN - NLM STAT- MEDLINE DCOM- 20210312 LR - 20210312 IS - 2050-084X (Electronic) IS - 2050-084X (Linking) VI - 9 DP - 2020 Jun 8 TI - Shear stimulation of FOXC1 and FOXC2 differentially regulates cytoskeletal activity during lymphatic valve maturation. LID - 10.7554/eLife.53814 [doi] LID - e53814 AB - Mutations in the transcription factor FOXC2 are predominately associated with lymphedema. Herein, we demonstrate a key role for related factor FOXC1, in addition to FOXC2, in regulating cytoskeletal activity in lymphatic valves. FOXC1 is induced by laminar, but not oscillatory, shear and inducible, endothelial-specific deletion impaired postnatal lymphatic valve maturation in mice. However, deletion of Foxc2 induced valve degeneration, which is exacerbated in Foxc1; Foxc2 mutants. FOXC1 knockdown (KD) in human lymphatic endothelial cells increased focal adhesions and actin stress fibers whereas FOXC2-KD increased focal adherens and disrupted cell junctions, mediated by increased ROCK activation. ROCK inhibition rescued cytoskeletal or junctional integrity changes induced by inactivation of FOXC1 and FOXC2 invitro and vivo respectively, but only ameliorated valve degeneration in Foxc2 mutants. These results identify both FOXC1 and FOXC2 as mediators of mechanotransduction in the postnatal lymphatic vasculature and posit cytoskeletal signaling as a therapeutic target in lymphatic pathologies. CI - (c) 2020, Norden et al. FAU - Norden, Pieter R AU - Norden PR AUID- ORCID: 0000-0002-5960-5245 AD - Feinberg Cardiovascular and Renal Research Institute, Department of Medicine, Feinberg School of Medicine, Northwestern University, Chicago, United States. FAU - Sabine, Amelie AU - Sabine A AUID- ORCID: 0000-0002-7512-6703 AD - Department of Oncology, Centre Hospitalier Universitaire Vaudois and University of Lausanne, Epalinges, Switzerland. FAU - Wang, Ying AU - Wang Y AUID- ORCID: 0000-0002-7852-386X AD - Department of Biochemistry and Molecular Biology, College of Medicine and Science, Mayo Clinic, Jacksonville, United States. FAU - Demir, Cansaran Saygili AU - Demir CS AD - Department of Oncology, Centre Hospitalier Universitaire Vaudois and University of Lausanne, Epalinges, Switzerland. FAU - Liu, Ting AU - Liu T AD - Feinberg Cardiovascular and Renal Research Institute, Department of Medicine, Feinberg School of Medicine, Northwestern University, Chicago, United States. FAU - Petrova, Tatiana V AU - Petrova TV AD - Department of Oncology, Centre Hospitalier Universitaire Vaudois and University of Lausanne, Epalinges, Switzerland. FAU - Kume, Tsutomu AU - Kume T AUID- ORCID: 0000-0002-6005-5316 AD - Feinberg Cardiovascular and Renal Research Institute, Department of Medicine, Feinberg School of Medicine, Northwestern University, Chicago, United States. LA - eng GR - R01 HL144129/HL/NHLBI NIH HHS/United States GR - R01 HL126920/HL/NHLBI NIH HHS/United States GR - P30 CA060553/CA/NCI NIH HHS/United States GR - T32 HL094293/HL/NHLBI NIH HHS/United States PT - Journal Article PT - Research Support, N.I.H., Extramural DEP - 20200608 PL - England TA - Elife JT - eLife JID - 101579614 RN - 0 (FOXC1 protein, human) RN - 0 (Forkhead Transcription Factors) RN - 0 (Foxc1 protein, mouse) RN - 0 (mesenchyme fork head 1 protein) SB - IM MH - Animals MH - Cells, Cultured MH - Embryo, Mammalian MH - Embryonic Development MH - Endothelial Cells/*metabolism MH - Forkhead Transcription Factors/genetics/*metabolism MH - Gene Expression Regulation, Developmental MH - Humans MH - Lymphatic System/growth & development/metabolism MH - Mice MH - Mice, Knockout PMC - PMC7302880 OTO - NOTNLM OT - cell biology OT - developmental biology OT - lymphatic endothelial cell OT - lymphatic valve OT - mesentery OT - mouse COIS- PN, AS, YW, CD, TL, TP, TK No competing interests declared EDAT- 2020/06/09 06:00 MHDA- 2021/03/13 06:00 PMCR- 2020/06/08 CRDT- 2020/06/09 06:00 PHST- 2019/11/21 00:00 [received] PHST- 2020/06/06 00:00 [accepted] PHST- 2020/06/09 06:00 [pubmed] PHST- 2021/03/13 06:00 [medline] PHST- 2020/06/09 06:00 [entrez] PHST- 2020/06/08 00:00 [pmc-release] AID - 53814 [pii] AID - 10.7554/eLife.53814 [doi] PST - epublish SO - Elife. 2020 Jun 8;9:e53814. doi: 10.7554/eLife.53814.