Zfyve16 regulates the proliferation of B-lymphoid cells

Abstract

Zfyve16 (a.k.a. endofin or endosome-associated FYVE-domain protein), a member of the FYVE-domain protein family, is involved in endosomal trafficking and in TGF-β, BMP, and EGFR signaling. The FYVE protein SARA regulates the TGF-β signaling pathway by recruiting Smad2/3 and accelerating their phosphorylation, thereby altering their susceptibility to TGF-β-mediated T cell suppression. Zfyve16 binds to Smad4 and their binding affects the formation of Smad2/3-Smad4 complex in TGF-β signaling. However, the in vivo function of Zfyve16 remains unknown. In this study, we generated a Zfyve16 knockout mouse strain (Zfyve16^KO) and examined its hematopoietic phenotypes and hematopoietic reconstruction ability. The proportion of T cells in the peripheral blood of Zfyve16^KO mice increases compared with that in wild-type mice. This finding is consistent with the role of Zfyve16 in facilitating TGF-β signaling. Unpredictably, B cell proliferation is inhibited in Zfyve16^KO mice. The proliferation potential of Zfyve16^KO B-lymphoid cells also significantly decreases in vitro. These results suggest that Zfyve16 inhibits the proliferation of T cells, possibly through the TGF-β signaling, but upregulates the proliferation of B-lymphoid cells.

Keywords

Zfyve16 / endofin / hematopoiesis / TGF-β / lymphocytes

References

[1] Seet LF, Hong W. Endofin, an endosomal FYVE domain protein. J Biol Chem 2001; 276(45): 42445–42454

[2] Michel SL, Berg JM. Building a metal binding domain, one half at a time. Chem Biol 2002; 9(6): 667–668

[3] Stenmark H, Aasland R, Toh BH, D’Arrigo A. Endosomal localization of the autoantigen EEA1 is mediated by a zinc-binding FYVE finger. J Biol Chem 1996; 271(39): 24048–24054

[4] Stenmark H, Aasland R. FYVE-finger proteins—effectors of an inositol lipid. J Cell Sci 1999; 112(Pt 23): 4175–4183

[5] Gillooly DJ, Simonsen A, Stenmark H. Cellular functions of phosphatidylinositol 3-phosphate and FYVE domain proteins. Biochem J 2001; 355(2): 249–258

[6] Chen YG, Wang Z, Ma J, Zhang L, Lu Z. Endofin, a FYVE domain protein, interacts with Smad4 and facilitates transforming growth factor-b signaling. J Biol Chem 2007; 282(13): 9688–9695PMID:17272273

[7] Dong M, Blobe GC. Role of transforming growth factor-b in hematologic malignancies. Blood 2006; 107(12): 4589–4596

[8] Huang F, Chen YG. Regulation of TGF-b receptor activity. Cell Biosci 2012; 2(1): 9 doi:10.1186/2045-3701-2-9

[9] Toy W, Lim SK, Loh MC, Lim YP. EGF-induced tyrosine phosphorylation of endofin is dependent on PI3K activity and proper localization to endosomes. Cell Signal 2010; 22(3): 437–446

[10] Blobe GC, Schiemann WP, Lodish HF. Role of transforming growth factor b in human disease. N Engl J Med 2000; 342(18): 1350–1358 doi:10.1056/NEJM200005043421807

[11] Khalil N. TGF-b: from latent to active. Microbes Infect 1999; 1(15): 1255–1263

[12] Hµger M, Pedersen CC, Larsen MT, Andersen MK, Hother C, Grønbæk K, Jarmer H, Borregaard N, Cowland JB. MicroRNA-130a-mediated down-regulation of Smad4 contributes to reduced sensitivity to TGF-b1 stimulation in granulocytic precursors. Blood 2011; 118(25): 6649–6659

[13] Derynck R, Zhang YE. Smad-dependent and Smad-independent pathways in TGF-b family signalling. Nature 2003; 425(6958): 577–584

[14] Letterio JJ. TGF-b signaling in T cells: roles in lymphoid and epithelial neoplasia. Oncogene 2005; 24(37): 5701–5712

[15] Zhang N, Bevan MJ. TGF-b signaling to T cells inhibits autoimmunity during lymphopenia-driven proliferation. Nat Immunol 2012; 13(7): 667–673

[16] Cottrez F, Groux H. Regulation of TGF-b response during T cell activation is modulated by IL-10. J Immunol 2001; 167(2): 773–778

[17] Letterio JJ, Geiser AG, Kulkarni AB, Dang H, Kong L, Nakabayashi T, Mackall CL, Gress RE, Roberts AB. Autoimmunity associated with TGF-b1-deficiency in mice is dependent on MHC class II antigen expression. J Clin Invest 1996; 98(9): 2109–2119

[18] Wolfraim LA, Fernandez TM, Mamura M, Fuller WL, Kumar R, Cole DE, Byfield S, Felici A, Flanders KC, Walz TM, Roberts AB, Aplan PD, Balis FM, Letterio JJ. Loss of Smad3 in acute T-cell lymphoblastic leukemia. N Engl J Med 2004; 351(6): 552–559

[19] Bakkebø M, Huse K, Hilden VI, Smeland EB, Oksvold MP. TGF-b-induced growth inhibition in B-cell lymphoma correlates with Smad1/5 signalling and constitutively active p38 MAPK. BMC Immunol 2010; 11(1): 57

[20] Tsukazaki T, Chiang TA, Davison AF, Attisano L, Wrana JL. SARA, a FYVE domain protein that recruits Smad2 to the TGFb receptor. Cell 1998; 95(6): 779–791

[21] Itoh F, Divecha N, Brocks L, Oomen L, Janssen H, Calafat J, Itoh S, Dijke P. The FYVE domain in Smad anchor for receptor activation (SARA) is sufficient for localization of SARA in early endosomes and regulates TGF-b/Smad signalling. Genes Cells 2002; 7(3): 321–331

[22] Seet LF, Hong W. Endofin recruits clathrin to early endosomes via TOM1. J Cell Sci 2005; 118(3): 575–587

[23] Seet LF, Liu N, Hanson BJ, Hong W. Endofin recruits TOM1 to endosomes. J Biol Chem 2004; 279(6): 4670–4679

[24] Goh JB, Wallace DF, Hong W, Subramaniam VN. Endofin, a novel BMP-SMAD regulator of the iron-regulatory hormone, hepcidin. Sci Rep 2015; 5(1): 13986

[25] Shi W, Chang C, Nie S, Xie S, Wan M, Cao X. Endofin acts as a Smad anchor for receptor activation in BMP signaling. J Cell Sci 2007; 120(7): 1216–1224

[26] Li MO, Wan YY, Flavell RA. T cell-produced transforming growth factor-b1 controls T cell tolerance and regulates Th1- and Th17-cell differentiation. Immunity 2007; 26(5): 579–591

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