IL1? Mediates HSPC Production (A) Generation of Tg(hsp70l:il1b) embryos. (B) runx1/cmyb expression (36 hpf) in the dorsal aorta with or without il1b overexpression (actIL1?; 32 hpf) in chimeric injected embryos. (C) Phenotype distribution plot of runx1/cmyb expression scored in embryos from (B) (n ? 117/condition). (D) actIL1? induces runx1 in whole Tg(hsp70l:il1b) embryos by qPCR (48 hpf, n = 5, mean ± SEM). (E) HSPCs quantified by flow cytometry (FC) in Tg(flk1:dsRed;cmyb:GFP;hsp70l:il1b) embryos compared with actIL1?? controls (48 hpf). Error bars indicate SD. (F) actIL1? (32 hpf) induces expression of il1b and common targets (n ? 3, 48 hpf, mean ± SEM). (G) Relative frequency of neutrophils in 120 hpf Tg(mpx:GFP;hsp70l:il1b) embryos heat-shocked at 32 hpf. Error bars indicate SD. (H) WISH images of cmyb expression in the kidney marrow (arrows) at 120 hpf, after actIL1? induction at 32 hpf. CFP eye signal was used to identify the presence of the hsp70l:il1b transgene. (I) Quantification of kidney marrow area in embryos from (H). Error bars indicate SD. Scale bars, 100 ?m. ?p < 0.05, ??p < 0.01. See also Figure S3.
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