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Lack of correlation between c-myc expression and programmed or experimentally-induced cell death during chick limb
M A Ros1, M Dolores Delgado, J Leon
1Departamento de Anatomía y Biología Celular, Universidad de Cantabria, Santander, Spain.
The International Journal of Developmental Biology
|December 1, 1995
Summary
Protooncogene c-myc, linked to cell death in lab studies, shows no expression increase during natural or induced cell death in developing chick limbs. This suggests c-myc may not regulate in vivo apoptosis.
Area of Science:
- Developmental Biology
- Molecular Biology
- Cell Death Research
Background:
- The protooncogene c-myc is implicated in regulating cell death (apoptosis) in in vitro models.
- It has been hypothesized that apoptosis is a physiological role of c-myc.
- Investigating c-myc's role in vivo, particularly during development, is crucial.
Purpose of the Study:
- To examine c-myc mRNA expression patterns during chick limb development.
- To determine if c-myc expression correlates with naturally occurring programmed cell death (apoptosis) in the developing limb.
- To assess c-myc expression changes in response to experimentally induced cell death.
Main Methods:
- In situ mRNA hybridization was employed on chick limb sections and whole-mounts.
- Analysis focused on stages of limb development with known cell death events.
- Surgical manipulation (apical ridge removal) was used to induce experimental cell death.
Main Results:
- c-myc mRNA expression was detected in premuscular masses and chondrogenic condensations during limb development.
- No c-myc expression was observed in regions of massive spontaneous apoptosis.
- Experimental induction of cell death via apical ridge removal did not elevate c-myc expression in the affected mesoderm.
Conclusions:
- The study found no correlation between elevated c-myc expression and apoptosis in the developing chick limb.
- Results challenge the proposed role of c-myc in regulating cell death in vivo.
- Further research may be needed to elucidate the precise functions of c-myc during embryonic development.