Chemical Reversion of Conventional Human Pluripotent Stem Cells to a Na&#239;ve-like State with Improved Multilineage Differentiation Potency

Na&#239;ve human pluripotent stem cells (N-hPSC) with improved functionality may have a wide impact in regenerative medicine. The goal of this protocol is ...

Johns Hopkins School of Medicine

We elucidate the cellular and molecular kinetics of the stepwise differentiation of human embryonic stem cells (hESCs) to primitive and definitive erythromyelopoiesis from human embryoid bodies (hEBs) in serum-free clonogenic assays. Hematopoiesis initiates from CD45 hEB cells with emergence of semiadherent mesodermal-hematoendothelial (MHE) colonies that can generate endothelium and form organized, yolk sac-like structures that secondarily generate multipotent primitive hematopoietic stem progenitor cells (HSPCs), erythroblasts, and CD13+CD45+ macrophages. A first wave of hematopoiesis follows MHE colony emergence and is predominated by primitive erythropoiesis characterized by a brilliant red hemoglobinization, CD71/CD325a (glycophorin A) expression, and exclusively embryonic/fetal hemoglobin expression. A second wave of definitive-type erythroid burst-forming units (BFU-e's), erythroid colony-forming units (CFU-e's), granulocyte-macrophage colony-forming cells (GM-CFCs), and multilineage CFCs follows next from hEB progenitors. These stages of hematopoiesis proceed spontaneously from hEB-derived cells without requirement for supplemental growth factors during hEB differentiation. Gene expression analysis of differentiating hEBs revealed that initiation of hematopoiesis correlated with increased levels of SCL/TAL1, GATA1, GATA2, CD34, CD31, and the homeobox gene-regulating factor CDX4 These data indicate that hematopoietic differentiation of hESCs models the earliest events of embryonic and definitive hematopoiesis in a manner resembling human yolk sac development, thus providing a valuable tool for dissecting the earliest events in human HSPC genesis.

Hematopoietic differentiation of human embryonic stem cells progresses through sequential hematoendothelial, primitive, and definitive stages resembling human yolk sac development.

&#x8840;&#x7BA1;&#x5468;&#x56F4;&#x591A;&#x80FD;&#x5E72;&#x95F4;&#x5145;&#x8D28;&#x7956;&#x7EC6;&#x80DE;&#x5B58;&#x5728;&#x4E8E;&#x5404;&#x79CD;&#x7EC4;&#x7EC7;&#xFF0C;&#x5305;&#x62EC;&#x80CE;&#x76D8;&#x3002;&#x5728;&#x8FD9;&#x91CC;&#xFF0C;&#x6211;&#x4EEC;&#x5EFA;&#x8BAE;&#x672C;&#x80CE;&#x76D8;&#x7EC4;&#x7EC7;&#x4E2D;&#x7684;&#x4E30;&#x5BCC;&#x8840;&#x7BA1;&#x53EF;&#x4EE5;&#x4F5C;&#x4E3A;&#x6E90;&#x7684;&#x6210;&#x808C;&#x7EC6;&#x80DE;&#x518D;&#x751F;&#x9AA8;&#x9ABC;&#x808C;&#x3002;&#x5165; SCID/mdx &#x9F20;&#xFF0C;&#x5176;&#x4E2D;&#x4ED6;&#x4EEC;&#x53C2;&#x52A0;&#x808C;&#x8089;&#x518D;&#x751F;&#x7684;&#x751F;&#x4EA7; myofibers &#x8868;&#x793A;&#x4EBA;&#x7C7B;&#x6297;&#x808C;&#x840E;&#x7F29;&#x86CB;&#x767D;&#x548C;&#x8840;&#x5F71;&#x7684;&#x8153;&#x80A0;&#x808C;&#x808C;&#x8089;&#x9996;&#x5148;&#x539F;&#x5C01;&#x4E0D;&#x52A8;&#x5730;&#x79FB;&#x690D;&#x89E3;&#x5256;&#x4ECE; mid-gestation &#x4EBA;&#x7C7B;&#x80CE;&#x76D8;&#x7ED2;&#x6BDB;&#x3002;&#x5728;&#x4F53;&#x5916;&#x80CE;&#x76D8;&#x7ED2;&#x6BDB;&#x91CA;&#x653E;&#x8868;&#x793A;&#x9AA8;&#x9AD3;&#x95F4;&#x5145;&#x8D28;&#x5E72;&#x7EC6;&#x80DE;&#x6807;&#x8BB0;&#x7269;&#x7684;&#x5047;&#x5B9A;&#x5468;&#x56F4;&#x8D77;&#x6E90; CD146 + CD34&#x207B;CD45&#x207B;CD56&#x207B; &#x7EC6;&#x80DE;&#x8FC5;&#x901F;&#x575A;&#x6301;&#x4E0E;&#x6D04;&#x6E38;&#x3002;CD146 + CD34&#x207B;CD45&#x207B;CD56&#x207B; &#x8840;&#x7BA1;&#x5468;&#x56F4;&#x7EC6;&#x80DE;&#x5206;&#x79BB;&#x548C;&#x51C0;&#x5316;&#x4ECE;&#x80CE;&#x76D8;&#x7ED2;&#x6BDB;&#x7684;&#x6D41;&#x6D41;&#x5F0F;&#x7EC6;&#x80DE;&#x4EEA;&#x662F;&#x5728;&#x6587;&#x5316;&#x4E2D;&#xFF0C;&#x786E;&#x5B9E;&#x975E;&#x5E38;&#x808C;&#x548C;&#x751F;&#x6210;&#x6297;&#x808C;&#x840E;&#x7F29;&#x86CB;&#x767D;&#x6297;&#x4F53;&#x9633;&#x6027; myofibers&#xFF0C;&#x4ED6;&#x4EEC;&#x664B;&#x5347;&#x5230; SCID/mdx &#x9F20;&#x6807;&#x808C;&#x8089;&#x79FB;&#x690D;&#x672F;&#x540E;&#x8840;&#x7BA1;&#x751F;&#x6210;&#x3002;&#x8FD9;&#x4E9B;&#x610F;&#x89C1;&#x786E;&#x8BA4;&#x95F4;&#x5145;&#x8D28;&#x7956;&#x7EC6;&#x80DE;&#x5728;&#x4EBA;&#x4F53;&#x8840;&#x7BA1;&#x58C1;&#x5185;&#x7684;&#x5B58;&#x5728;&#xFF0C;&#x5E76;&#x8868;&#x660E;&#x4E30;&#x5BCC;&#x5E26;&#x8840;&#x7BA1;&#x8482;&#x7684;&#x4EBA;&#x7C7B;&#x80CE;&#x76D8;&#x8840;&#x7BA1;&#x5468;&#x56F4;&#x808C;&#x7EC6;&#x80DE;&#x80FD;&#x591F;&#x5728;&#x8425;&#x517B;&#x4E0D;&#x826F;&#x6027;&#x808C;&#x5185;&#x8FC1;&#x79FB;&#xFF0C;&#x5E76;&#x91CD;&#x65B0;&#x751F;&#x6210; myofibers &#x7684;&#x4E30;&#x5BCC;&#x6765;&#x6E90;&#x3002;

&#x4EBA;&#x4F53;&#x808C;&#x8089;&#x518D;&#x751F;&#x7684;&#x80CE;&#x76D8;&#x8840;&#x7BA1;&#x5468;&#x56F4;&#x7EC6;&#x80DE;&#x3002;

Perivascular multipotent mesenchymal progenitors exist in a variety of tissues, including the placenta. Here, we suggest that the abundant vasculature present in the human placenta can serve as a source of myogenic cells to regenerate skeletal muscle. Chorionic villi dissected from the mid-gestation human placenta were first transplanted intact into the gastrocnemius muscles of SCID/mdx mice, where they participated in muscle regeneration by producing myofibers expressing human dystrophin and spectrin. In vitro-cultured placental villi released rapidly adhering and migratory CD146+CD34â»CD45â»CD56â» cells of putative perivascular origin that expressed mesenchymal stem cell markers. CD146+CD34â»CD45â»CD56â» perivascular cells isolated and purified from the placental villi by flow cytometry were indeed highly myogenic in culture, and generated dystrophin-positive myofibers, and they promoted angiogenesis after transplantation into SCID/mdx mouse muscles. These observations confirm the existence of mesenchymal progenitor cells within the walls of human blood vessels, and suggest that the richly vascularized human placenta is an abundant source of perivascular myogenic cells able to migrate within dystrophic muscle and regenerate myofibers.

Placental perivascular cells for human muscle regeneration.

Perivasculares progenitores mesenquimales multipotentes existir en una variedad de tejidos, incluyendo la placenta. Aqu&#xED;, se sugiere que la presente vasculatura abundante en la placenta humana puede servir como una fuente de c&#xE9;lulas miog&#xE9;nicas para regenerar el m&#xFA;sculo esquel&#xE9;tico. Las vellosidades cori&#xF3;nicas disecados de la placenta humana mitad de la gestaci&#xF3;n fueron trasplantados primera intacto en los m&#xFA;sculos gemelos de SCID / MDX ratones, en los que participaron en la regeneraci&#xF3;n del m&#xFA;sculo por la producci&#xF3;n de fibras musculares que expresan humana distrofina y espectrina. In vitro, cultivo de vellosidades placentarias libera r&#xE1;pidamente adherentes y migratorias CD146 + CD34 CD45 &#x207B; &#x207B; CD56 &#x207B; c&#xE9;lulas de origen supuesta perivascular que expresa marcadores de c&#xE9;lulas madre mesenquimales. CD146 + CD34 &#x207B; CD45 CD56 &#x207B; &#x207B; de las c&#xE9;lulas perivasculares aislados y purificados a partir de las vellosidades placentarias por citometr&#xED;a de flujo eran en realidad altamente miog&#xE9;nica en la cultura, y ha generado positivas de distrofina fibras musculares, y se promueve la angiog&#xE9;nesis tras el trasplante en los m&#xFA;sculos de ratones SCID / MDX. Estas observaciones confirman la existencia de c&#xE9;lulas progenitoras mesenquimales dentro de las paredes de los vasos sangu&#xED;neos humanos, y sugieren que el ricamente vascularizado de la placenta humana es una fuente abundante de c&#xE9;lulas perivasculares miog&#xE9;nicas capaces de migrar dentro del m&#xFA;sculo distr&#xF3;fico y regenerar fibras musculares.

Placenta c&#xE9;lulas perivasculares para la regeneraci&#xF3;n del m&#xFA;sculo humano

P&#xE9;rivasculaires multipotentes m&#xE9;senchymateuses prog&#xE9;nitrices existent dans une vari&#xE9;t&#xE9; de tissus, y compris le placenta. Ici, nous sugg&#xE9;rons que le pr&#xE9;sent syst&#xE8;me vasculaire abondante dans le placenta humain peut servir comme une source de cellules myog&#xE9;niques pour r&#xE9;g&#xE9;n&#xE9;rer le muscle squelettique. Villosit&#xE9;s choriales diss&#xE9;qu&#xE9;s &#xE0; partir du placenta &#xE0; mi-gestation humaine ont d&#x26;#39;abord &#xE9;t&#xE9; transplant&#xE9; intact dans les muscles jumeaux de SCID / mdx souris, o&#xF9; ils ont particip&#xE9; &#xE0; la r&#xE9;g&#xE9;n&#xE9;ration du muscle par myofibres producteurs exprimant la dystrophine humaine et la spectrine. In vitro-culture villosit&#xE9;s placentaires lib&#xE9;r&#xE9; rapidement adh&#xE9;rents et migrateurs CD146 + CD34 CD45 &#x207B; &#x207B; &#x207B; CD56 des cellules d&#x26;#39;origine p&#xE9;rivasculaire putatif qui a exprim&#xE9; marqueurs des cellules souches m&#xE9;senchymateuses. CD146 + CD34 CD45 &#x207B; &#x207B; &#x207B; CD56 des cellules p&#xE9;rivasculaires isol&#xE9;s et purifi&#xE9;s &#xE0; partir des villosit&#xE9;s placentaires par cytom&#xE9;trie de flux ont &#xE9;t&#xE9; en effet tr&#xE8;s myog&#xE9;nique dans la culture, et a g&#xE9;n&#xE9;r&#xE9; la dystrophine-positives myofibres, et ils ont favoris&#xE9; l&#x26;#39;angiogen&#xE8;se apr&#xE8;s la transplantation dans les muscles de souris SCID / mdx. Ces observations confirment l&#x26;#39;existence de cellules souches m&#xE9;senchymateuses dans les parois des vaisseaux sanguins de l&#x26;#39;homme, et sugg&#xE8;rent que le placenta humain richement vascularis&#xE9;e est une source abondante de cellules myog&#xE9;niques p&#xE9;rivasculaires capables de migrer &#xE0; l&#x26;#39;int&#xE9;rieur du muscle dystrophique et la r&#xE9;g&#xE9;n&#xE9;ration des fibres musculaires.

Placentaires cellules p&#xE9;rivasculaires pour la r&#xE9;g&#xE9;n&#xE9;ration des muscles humains

Perivaskul&auml;ren multipotenten Mesenchymale Vorl&auml;uferzellen vorhanden in einer Vielzahl von Geweben, einschlie&szlig;lich der Plazenta. Hier empfehlen wir die reichlich Gef&auml;&szlig;system in der menschlichen Plazenta vorhanden als eine Quelle von myogener Zellen Regenerieren der Skelettmuskulatur dienen kann. Chorionzotten, die von der mid-gestation menschlichen Plazenta seziert wurden zun&auml;chst intakt in die Gastrocnemius Muskeln SCID/Mdx-M&auml;use, transplantiert wo sie bei Muskel-Regeneration nahmen durch die Herstellung von Myofibers, die menschliche Dystrophin und Spektrin auszudr&uuml;cken. In Vitro kultiviert Plazenta Zotten ver&ouml;ffentlicht rasch haftende und wandernde CD146 + CD34&#x207B;CD45&#x207B;CD56&#x207B; Zellen vermeintliche perivaskul&auml;ren Ursprungs, die mesenchymalen Stammzell-Marker ausgedr&uuml;ckt. CD146 + CD34&#x207B;CD45&#x207B;CD56&#x207B; perivaskul&auml;ren Zellen isoliert und gereinigt aus der Plazenta Zotten von Flow Cytometry waren in der Tat sehr myogener in Kultur, generiert Dystrophin-Positive Myofibers und f&ouml;rderten sie Angiogenesis nach der Transplantation in SCID/Mdx Maus Muskeln. Diese Beobachtungen best&auml;tigen die Existenz von mesenchymalen Vorl&auml;uferzellen innerhalb der Mauern der menschlichen Blutgef&auml;&szlig;e, und schlagen vor, da&szlig; die reich gef&auml;&szlig;reichen menschliche Plazenta ist eine reiche Quelle der perivaskul&auml;ren myogener Zellen migrieren innerhalb dystrophische Muskeln und Myofibers zu regenerieren k&ouml;nnen.

Plazenta perivaskul&auml;ren Zellen menschlichen Muskel-Regeneration.

Progenitori mesenchimali multipotenti perivascolare esistono in una variet&agrave; di tessuti, tra cui la placenta. Qui, suggeriamo che la vascolarizzazione abbondante presente nella placenta umana pu&ograve; servire come fonte di cellule miogena rigenerare i muscoli scheletrici. Villi coriali sezionati da placenta umana mid-gestation in primo luogo sono stati trapiantati intatto in muscoli gastrocnemio di topi SCID/mdx, dove hanno partecipato nella rigenerazione muscolare producendo myofibers esprimendo spettrina e distrofina umana. Nei villi placentari coltivate in vitro rilasciato rapidamente aderente e migratorie CD146 + CD34&#x207B;CD45&#x207B;CD56&#x207B; cellule di origine putativo perivascolare che espressi marcatori delle cellule staminali mesenchimali. CD146 + CD34&#x207B;CD45&#x207B;CD56&#x207B; perivascolari cellule isolate e purificate dalle villi placentari di flusso cytometry erano infatti altamente miogena nella cultura e generato myofibers distrofina-positivi, e hanno promosso l&#39;angiogenesi dopo trapianto in muscoli topo SCID/mdx. Queste osservazioni confermano l&#39;esistenza di cellule progenitrici mesenchimali entro le pareti dei vasi sanguigni umani e suggeriscono che la placenta umana riccamente vascolarizzata &egrave; un&#39;abbondante fonte di perivascolare miogena cellule in grado di migrare all&#39;interno distrofica muscolare e rigenerare myofibers.

Cellule perivascolari placentare per rigenerazione muscolare umana.

&#x8840;&#x7BA1;&#x5468;&#x56F2;&#x306E;&#x591A;&#x80FD;&#x6027;&#x9593;&#x8449;&#x7CFB;&#x524D;&#x99C6;&#x7D30;&#x80DE;&#x306F;&#x3001;&#x80CE;&#x76E4;&#x3092;&#x542B;&#x3080;&#x69D8;&#x3005;&#x306A;&#x7D44;&#x7E54;&#x306B;&#x5B58;&#x5728;&#x3057;&#x3066;&#x3044;&#x307E;&#x3059;&#x3002;&#x3053;&#x3053;&#x3067;&#x306F;&#x3001;&#x30D2;&#x30C8;&#x80CE;&#x76E4;&#x306B;&#x8C4A;&#x5BCC;&#x306A;&#x8840;&#x7BA1;&#x304C;&#x5B58;&#x5728;&#x3059;&#x308B;&#x9AA8;&#x683C;&#x7B4B;&#x3092;&#x518D;&#x751F;&#x3059;&#x308B;&#x305F;&#x3081;&#x306B;&#x7B4B;&#x7D30;&#x80DE;&#x306E;&#x4F9B;&#x7D66;&#x6E90;&#x3068;&#x3057;&#x3066;&#x6A5F;&#x80FD;&#x3059;&#x308B;&#x3053;&#x3068;&#x3092;&#x793A;&#x5506;&#x3057;&#x3066;&#x3044;&#x308B;&#x3002;&#x598A;&#x5A20;&#x4E2D;&#x671F;&#x30D2;&#x30C8;&#x80CE;&#x76E4;&#x304B;&#x3089;&#x89E3;&#x5256;&#x7D68;&#x6BDB;&#x306F;&#x3001;&#x6700;&#x521D;&#x306B;&#x3001;&#x5F7C;&#x3089;&#x304C;&#x4EBA;&#x9593;&#x306E;&#x30B8;&#x30B9;&#x30C8;&#x30ED;&#x30D5;&#x30A3;&#x30F3;&#x3068;&#x30B9;&#x30DA;&#x30AF;&#x30C8;&#x30EA;&#x30F3;&#x3092;&#x767A;&#x73FE;&#x3057;&#x3066;&#x751F;&#x6210;&#x3059;&#x308B;&#x7DDA;&#x7DAD;&#x306B;&#x3088;&#x3063;&#x3066;&#x7B4B;&#x8089;&#x306E;&#x518D;&#x751F;&#x306B;&#x53C2;&#x52A0;&#x3057;&#x305F;SCID / mdx&#x30DE;&#x30A6;&#x30B9;&#x306E;&#x8153;&#x8179;&#x7B4B;&#x306B;&#x305D;&#x306E;&#x307E;&#x307E;&#x79FB;&#x690D;&#x3057;&#x305F;&#x3002; in vitro&#x3067;&#x57F9;&#x990A;&#x3057;&#x305F;&#x80CE;&#x76E4;&#x306E;&#x7D68;&#x6BDB;&#x306F;&#x3001;&#x6025;&#x901F;&#x306B;&#x4ED8;&#x7740;&#x3057;&#x3001;&#x6E21;&#x308A;&#x9CE5;&#x306E;CD146 + CD34 CD45&#x207B;&#x207B;&#x207B;CD56&#x9593;&#x8449;&#x7CFB;&#x5E79;&#x7D30;&#x80DE;&#x30DE;&#x30FC;&#x30AB;&#x30FC;&#x3092;&#x767A;&#x73FE;&#x63A8;&#x5B9A;&#x8840;&#x7BA1;&#x7531;&#x6765;&#x306E;&#x7D30;&#x80DE;&#x3002;&#x30EA;&#x30EA;&#x30FC;&#x30B9;&#x30D5;&#x30ED;&#x30FC;&#x30B5;&#x30A4;&#x30C8;&#x30E1;&#x30C8;&#x30EA;&#x30FC;&#x306B;&#x3088;&#x308B;&#x80CE;&#x76E4;&#x7D68;&#x6BDB;&#x304B;&#x3089;&#x5358;&#x96E2;&#x3055;&#x308C;&#x3001;&#x7CBE;&#x88FD;&#x3055;&#x308C;&#x305F;CD146 + CD34&#x207B;CD45&#x207B;CD56&#x207B;&#x8840;&#x7BA1;&#x5468;&#x56F2;&#x7D30;&#x80DE;&#x306F;&#x3001;&#x57F9;&#x990A;&#x4E2D;&#x306E;&#x5B9F;&#x969B;&#x306B;&#x975E;&#x5E38;&#x306B;&#x7B4B;&#x305F;&#x3057;&#x3001;&#x30B8;&#x30B9;&#x30C8;&#x30ED;&#x30D5;&#x30A3;&#x30F3;&#x967D;&#x6027;&#x7DDA;&#x7DAD;&#x3092;&#x751F;&#x6210;&#x3057;&#x3001;&#x305D;&#x3057;&#x3066;&#x3001;&#x5F7C;&#x3089;&#x306F;SCID / mdx&#x30DE;&#x30A6;&#x30B9;&#x306E;&#x7B4B;&#x8089;&#x306B;&#x79FB;&#x690D;&#x5F8C;&#x306E;&#x8840;&#x7BA1;&#x65B0;&#x751F;&#x3092;&#x4FC3;&#x9032;&#x3057;&#x305F;&#x3002;&#x3053;&#x308C;&#x3089;&#x306E;&#x89B3;&#x200B;&#x200B;&#x5BDF;&#x306F;&#x3001;&#x4EBA;&#x9593;&#x306E;&#x8840;&#x7BA1;&#x306E;&#x58C1;&#x5185;&#x306E;&#x9593;&#x8449;&#x7CFB;&#x524D;&#x99C6;&#x7D30;&#x80DE;&#x306E;&#x5B58;&#x5728;&#x3092;&#x78BA;&#x8A8D;&#x3057;&#x3001;&#x8C4A;&#x304B;&#x306A;&#x8840;&#x7BA1;&#x30D2;&#x30C8;&#x80CE;&#x76E4;&#x304C;&#x30B8;&#x30B9;&#x30C8;&#x30ED;&#x30D5;&#x30A3;&#x30FC;&#x7B4B;&#x304A;&#x3088;&#x3073;&#x518D;&#x751F;&#x6210;&#x306E;&#x7B4B;&#x7DDA;&#x7DAD;&#x5185;&#x306B;&#x79FB;&#x884C;&#x3059;&#x308B;&#x3053;&#x3068;&#x304C;&#x3067;&#x304D;&#x8840;&#x7BA1;&#x7B4B;&#x7D30;&#x80DE;&#x306E;&#x8C4A;&#x5BCC;&#x306A;&#x4F9B;&#x7D66;&#x6E90;&#x3067;&#x3042;&#x308B;&#x3053;&#x3068;&#x3092;&#x793A;&#x5506;&#x3057;&#x3066;&#x3044;&#x308B;&#x3002;

&#x4EBA;&#x9593;&#x306E;&#x7B4B;&#x8089;&#x306E;&#x518D;&#x751F;&#x306E;&#x305F;&#x3081;&#x306B;&#x80CE;&#x76E4;&#x306E;&#x8840;&#x7BA1;&#x5468;&#x56F2;&#x7D30;&#x80DE;

Perivascular multipotent &#xC5FD; progenitors &#xC870;&#xC9C1;, &#xD0DC; &#xBC18; &#xB4F1;&#xC758; &#xB2E4;&#xC591; &#xD55C; &#xC874;&#xC7AC;. &#xC5EC;&#xAE30;, &#xC778;&#xAC04;&#xC758; &#xD0DC; &#xBC18;&#xC5D0; &#xD48D;&#xBD80;&#xD55C; &#xD608;&#xAD00; &#xACE8;&#xACA9; &#xADFC;&#xC721; &#xC7AC;&#xC0DD;&#xC131; myogenic &#xC140;&#xC758; &#xC6D0;&#xBCF8;&#xC73C;&#xB85C; &#xC0AC;&#xC6A9;&#xD560; &#xC218; &#xC788;&#xC2B5;&#xB2C8;&#xB2E4; &#xD558;&#xB294; &#xAC83;&#xC774; &#xC88B;&#xC2B5;&#xB2C8;&#xB2E4;. Mid-gestation &#xC778;&#xAC04;&#xC758; &#xD0DC; &#xBC18;&#xC5D0;&#xC11C; &#xD574; &#xBD80; &#xC735; villi &#xCC98;&#xC74C; SCID/mdx &#xC950;, &#xADF8;&#xB4E4;&#xC740; &#xC778;&#xAC04;&#xC758; dystrophin spectrin &#xD45C;&#xD604; myofibers&#xB97C; &#xC0DD;&#xC0B0; &#xD558; &#xC5EC; &#xADFC;&#xC721; &#xC7AC;&#xC0DD;&#xC131;&#xC5D0; &#xCC38;&#xAC00; gastrocnemius &#xADFC;&#xC721;&#xC5D0; &#xADF8;&#xB300;&#xB85C; &#xC774;&#xC2DD; &#xD588;&#xB2E4;. Placental villi &#xCCB4; &#xC678; &#xBC30;&#xC591; &#xC911;&#xAC04; &#xC5FD; &#xC904;&#xAE30; &#xC138;&#xD3EC; &#xD45C;&#xC2DD; &#xD45C;&#xC2DC; &#xC0C1; perivascular &#xAE30;&#xC6D0;&#xC758; &#xC2E0;&#xC18D; &#xD558; &#xAC8C; &#xC811;&#xCC29; &#xD558; &#xACE0; &#xCCA0;&#xC0C8; CD146 + CD34&#x207B;CD45&#x207B;CD56&#x207B; &#xC140;&#xC744; &#xBC1C;&#xD45C; &#xD588;&#xB2E4;. CD146 + CD34&#x207B;CD45&#x207B;CD56&#x207B; perivascular &#xC138;&#xD3EC; &#xACA9;&#xB9AC; &#xADF8;&#xB9AC;&#xACE0; &#xC815;&#xD654; &#xD750;&#xB984;&#xC5D0; &#xC758;&#xD574; placental villi&#xC5D0;&#xC11C; cytometry &#xD588;&#xB2E4; &#xC2E4;&#xC81C;&#xB85C; &#xB192;&#xC740; &#xBB38;&#xD654;, myogenic&#xC640; dystrophin &#xC591;&#xC131; myofibers &#xC0DD;&#xC131; SCID/mdx &#xB9C8;&#xC6B0;&#xC2A4; &#xADFC;&#xC721;&#xC5D0; &#xC774;&#xC2DD; &#xD6C4; &#xC2E0;&#xC0DD;&#xC744; &#xC2B9;&#xC9C4;. &#xC774;&#xB7EC;&#xD55C; &#xAD00;&#xCE21; &#xC778;&#xAC04;&#xC758; &#xD608;&#xAD00; &#xBCBD; &#xB0B4; &#xC5FD; &#xC870;&#xC0C1; &#xC138;&#xD3EC;&#xC758; &#xC874;&#xC7AC;&#xB97C; &#xD655;&#xC778; &#xD558; &#xACE0; &#xD48D;&#xBD80;&#xD55C; vascularized &#xC778;&#xAC04;&#xC758; &#xD0DC; &#xBC18; &#xD48D;&#xBD80;&#xD55C; &#xC6D0;&#xCC9C;&#xC774; perivascular myogenic &#xC140; dystrophic &#xADFC;&#xC721; &#xB0B4;&#xC5D0;&#xC11C; &#xB9C8;&#xC774;&#xADF8;&#xB808;&#xC774;&#xC158;&#xD560; myofibers&#xB97C; &#xB2E4;&#xC2DC; &#xC0DD;&#xC131; &#xD558;&#xB294; &#xAC83;&#xC774; &#xC88B;&#xC2B5;&#xB2C8;&#xB2E4;.

&#xC778;&#xAC04;&#xC758; &#xADFC;&#xC721; &#xC7AC;&#xC0DD; &#xD0DC; &#xBC18; perivascular &#xC140;&#xC785;&#xB2C8;&#xB2E4;.

The hematopoietic and vascular lineages are intimately entwined as they arise together from bipotent hemangioblasts and hemogenic endothelial precursors during human embryonic development. In vitro differentiation of human pluripotent stem cells toward these lineages provides opportunities for elucidating the mechanisms of hematopoietic genesis. We previously demonstrated the stepwise in vitro differentiation of human embryonic stem cells (hESC) to definitive erythromyelopoiesis through clonogenic bipotent primitive hemangioblasts. This system recapitulates an orderly hematopoiesis similar to human yolk sac development via the generation of mesodermal-hematoendothelial progenitor cells that give rise to endothelium followed by embryonic primitive and definitive hematopoietic cells. Here, we report that under modified feeder-free endothelial culture conditions, multipotent CD34⁺ CD45⁺ hematopoietic progenitors arise in mass quantities from differentiated hESC and human induced pluripotent stem cells (hiPSC). These hematopoietic progenitors arose directly from adherent endothelial/stromal cell layers in a manner resembling in vivo hematopoiesis from embryonic hemogenic endothelium. Although fibroblast-derived hiPSC lines were previously found inefficient in hemato-endothelial differentiation capacity, our culture system also supported robust hiPSC hemato-vascular differentiation at levels comparable to hESC. We present comparative differentiation results for simultaneously generating hematopoietic and vascular progenitors from both hESC and fibroblast-hiPSC. This defined, optimized, and low-density differentiation system will be ideal for direct single-cell time course studies of the earliest hematopoietic events using time-lapse videography, or bulk kinetics using flow cytometry analyses on emerging hematopoietic progenitors.

Efficient and simultaneous generation of hematopoietic and vascular progenitors from human induced pluripotent stem cells.

The generation of vascular progenitors (VPs) from human induced pluripotent stem cells (hiPSCs) has great potential for treating vascular disorders such as ischemic retinopathies. However, long-term in vivo engraftment of hiPSC-derived VPs into the retina has not yet been reported. This goal may be limited by the low differentiation yield, greater senescence, and poor proliferation of hiPSC-derived vascular cells. To evaluate the potential of hiPSCs for treating ischemic retinopathies, we generated VPs from a repertoire of viral-integrated and nonintegrated fibroblast and cord blood (CB)-derived hiPSC lines and tested their capacity for homing and engrafting into murine retina in an ischemia-reperfusion model.

Vascular progenitors from cord blood-derived induced pluripotent stem cells possess augmented capacity for regenerating ischemic retinal vasculature.

Many forms of blindness result from the dysfunction or loss of retinal photoreceptors. Induced pluripotent stem cells (iPSCs) hold great potential for the modelling of these diseases or as potential therapeutic agents. However, to fulfill this promise, a remaining challenge is to induce human iPSC to recreate in vitro key structural and functional features of the native retina, in particular the presence of photoreceptors with outer-segment discs and light sensitivity. Here we report that hiPSC can, in a highly autonomous manner, recapitulate spatiotemporally each of the main steps of retinal development observed in vivo and form three-dimensional retinal cups that contain all major retinal cell types arranged in their proper layers. Moreover, the photoreceptors in our hiPSC-derived retinal tissue achieve advanced maturation, showing the beginning of outer-segment disc formation and photosensitivity. This success brings us one step closer to the anticipated use of hiPSC for disease modelling and open possibilities for future therapies.

Tea Soon Park

Department of Oncology,
Division of Pediatric Oncology and Institute for Cell Engineering,
Department of Oncology, Division of Pediatric Oncology and Institute for Cell Engineering

Johns Hopkins School of Medicine

Chemical Reversion of Conventional Human Pluripotent Stem Cells to a Naïve-like State with Improved Multilineage Differentiation Potency

Tea Soon Park

.css-o250i3{font-size:18px;font-family:Open Sans,sans-serif;line-height:21.6px;}Department of Oncology,Division of Pediatric Oncology and Institute for Cell Engineering,Department of Oncology, Division of Pediatric Oncology and Institute for Cell Engineering

Johns Hopkins School of Medicine

Chemical Reversion of Conventional Human Pluripotent Stem Cells to a Naïve-like State with Improved Multilineage Differentiation Potency

Department of Oncology,
Division of Pediatric Oncology and Institute for Cell Engineering,
Department of Oncology, Division of Pediatric Oncology and Institute for Cell Engineering