fishing for new therapies for dba zebrafish · (healthy fish) mutant that lacks hemoglobin...
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ZebrafishFishing for New Therapies for DBA
Camp Sunshine 2017 Elizabeth Macari, PhD
Lab of Leonard Zon, MD Boston Children’s Hospital
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Transparent embryo
Circulating blood in 23 hours
Transgenic fish
Genetic screens Gene knockdowns
Chemical screens
Conserved blood lineages
Adult
100s of progeny / week
Strengths of studying zebrafish
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Zebrafish embryoHuman embryo(28 days) (19 hours)
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Wild Type (Healthy Fish)
Mutant that lacks
hemoglobin
Visualizing red blood cells in zebrafish
Hemoglobin Stain
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Twomethodstomodifyzebrafish
X
Chemical treatment to induce random mutations
+/+ +/ m
Inject genetic material into 1 cell stage
+/+ +/+
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Casper
Transparent,adultzebrafish
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CasperlackspigmentofWTfish
WT
Casper
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sis (grx5)
cia (transferrin receptor ) cdy (dmt1) drc(fch) frs (mitoferrin) cha (protein 4.1)
Lymphoid progenitor T cell
B cell
Myeloid
Erythroid
assam camomile darjeeling earl grey (sart 3) jasmine
Hematopoietic Stem Cell
bls
vld (gata1) mon (tifγ)
gata2
Erythroid -myeloid progenitor
DBA (rps29) ret (band 3) ris (b-spectrin) sau (alas2) weh(fpn1) yqe (urod) zin (globin)
Zebrafishbloodmutantgenes
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Wild Type (Healthy Fish)
DBA model Mutation in
rps29
DBA zebrafish model
Hemoglobin Stain
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Twomethodstomodifyzebrafish
X
Chemical treatment to induce random mutations
+/+ +/ m
Inject genetic material into 1 cell stage
+/+ +/+
Thismethodisusefultoaddbackagenethatismissing
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Human RPS29 RNA can rescue hemoglobin in rps29 mutant DBA model
MirabelloL,MacariEetal.Blood2014
rps29-/-
InjectHealthyhuman(WT)RPS29RNA
OrRNAfromDBApaMent 48h
StainforHemoglobin
+ WT RNA
+ I31F RNA uninjected + I50T RNA
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Chemical screen using DBA zebrafish model
DBA zebrafish model
Chemicallibraries600compounds
Chemical“hits”
Screenforrescueof
hemoglobin
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Chemical screen identifies calmodulin inhibitors increase hemoglobin
StainforHemoglobin
rps29+/- rps29-/-
VehicleCaMinhibitors
Trifluoperazine(TFP)
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TFP improves anemia in DBA mouse model
Kavitha Siva and Johan Flygare
TFP (5 mg/kg IP)
Blood/BM Collection
2 wks
**p<0.01
RPS19mutantDBA
Mouse
HealthyMice
Healthy mouse
DBA mouse
DBA mouse + TFP
0
50
100
150
200
Hem
oglo
bin
(g/L
) **
DBAMice
DBAMice+TFP
Hemoglobin
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RPS19R94XSteroidresponsive10yearoldpaMent
TFPincreasesredbloodcellsinDBApaMentbonemarrowsamples
RBC Differentiation BM cells
TFP5days4days
SergeiDoulatovandLindaVo
Analysisforredbloodcellmarkers
CD71
TFP5µm
GLYA
Healthybonemarrow DBApaMentbonemarrow
89 20 50
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PaMentderivedinducedpluripotentstem(iPS)cells
Patient
Patient-derived iPS cells
Too few patient blood cells
Blood cells
Disease modeling and drug screens
Skin cells Respecify
Patient fibroblasts: RPS19 RPL5
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DBAiPScellsshowimpairedabilitytomakeredbloodcells
RPS19+/-Control RPL5+/- Controlheme RPL5+/-heme
GLYA
CD71
33 11 10
RBC Differentiation iPS cells Analysisforredbloodcell
markersandhemoglobinDBApaMentskincells
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Chemical screen using DBA iPS cells
DBA patient derived iPS cells
Chemical“hits”
Screenforchemicalsthatgivemoreredbloodcells
Chemicallibraries1200compounds
SMER28
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SMER28increasesnumberofredbloodcells
RPL5+/- DBA Cells RPL5+/- DBA Cells
+SMER28
Healthy DBA RPS19 mutant cells
CD71
GLY
A
1.0 µM SMER28
89 54 76.5
Control
RBC Differentiation iPS cells
SMER28
Analysisforredbloodcellmarkers
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SMER28increasesredbloodcellsinDBApaMentsamples
GLY
A
CD71
DBA Patient 1 RPS19
DBA Patient 2 RPS29
untreated SMER28 1.0 µM
20 55
15 41
RBC Differentiation BM cells
SMER284days
Analysisforredbloodcellmarkers
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SMER28improveshemoglobininDBAzebrafishmodel
Healthy (WT)
DBA DBA
1µM SMER28
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Chemical screens to discover potential therapies to treat DBA
DBA patient derived iPS cells
DBA zebrafish model
TFP SMER28
ClinicaltrialstarMnginadults
FurthertesMngandbeferderivaMvesneeded
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Funding NHLBI F32 and NHBLI U01
BCH FACS Core Ronald Mathieu Mahnaz Paktinat Lund University Johan Flygare Kavitha Siva Northwell Health Jeff Lipton Adrianna Vlachos
Acknowledgements
Zon Lab
Len Zon Alison Taylor Emma Stillman Julia Huber Kate McGrath Serine Avagyan Julien Ablain Julie Perlin Christie Ciarlo Jess Humphries Alessia Giannozzi Entire Zon Lab!
Kara Maloney Chris Lawrence Bruce Barut Hannah diCicco
Daley Lab Sergei Doulatov Linda Vo
Ebert Lab Dave Raiser Anu Narla
Taplin Mass Spec Ross Tamaino
NCI Blanche Alter Lisa Mirabello Sharon Savage
DBA patients and their families
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