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Fig. 4. Barhl2 pro-apoptotic activity is normally involved in regulating endogenous
apoptosis. (A) TUNEL staining of stage 12.5 (a), stage 15 (b) and stage 18
(c,d) embryos. (d) Magnified view of the boxed region in c. (e,f) Double in
situ hybridization of stage 18 embryos using digoxigenin- and
fluorescein-labeled RNA probes: Xbarhl2 (dark blue) and Xshh
(light blue) (e); Xbarhl2 (dark blue) and Xpax6 (light blue)
(f). (g) In situ hybridization of Xbarhl2AS-injected embryo using
Xpax6 as a probe. (a,b) Dorsal views, anterior upwards. (c-f)
Anterior views, dorsal upwards. (B) Comparison of the percentage of
TUNEL-positive embryos (defined as exhibiting more then 30 apoptotic nuclei in
the axial midline, i.e. where endogenous apoptosis normally occurs) between
wild-type embryos and embryos injected in the two dorsal blastomeres at the
two-cell stage with Xbarhl2AS. Each experimental batch
(n=60) was assessed independently. Three different experiments were
performed and the results are shown as mean±s.e.m. (C) Kinetics of
Xbarhl2 induced apoptosis between stage 8 and stage 13. Embryos were
injected in one dorsal blastomere at the two-cell stage with GFP
(dark blue), Xbarhl2 (red), Xbarhl2 together with
Xbarhl2AS (green) or Xpax6 (light blue) and collected at
indicated developmental stages. Cell death was measured by cell death
detection ELISA. The apoptotic EF is calculated using GFP-injected
embryos as a control. We carried out three different experiments and the
results are shown as mean±s.e.m. (D) Western blot analysis on 3 µg
of protein extracted from stage 12 embryos injected with Xbarhl2 (100
pg) together with Xbarhl2ASIII or Xbarhl2 (100 pg) together
with Xbarhl2ASII, Xpax6 (100 pg), as indicated. The arrow indicates
the large (19 kDa) cleaved caspase 3 fragment. The broken arrow shows a
nonspecific band used as an internal control.
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