Related Experiment Videos
Male-specific cell migration into the developing gonad is a conserved process involving PDGF signalling
Craig A Smith1, Peter J McClive, Quanah Hudson
1Department of Paediatrics and Murdoch Children's Research Institute, The University of Melbourne, Royal Children's Hospital, Melbourne, Victoria 3052, Australia.
Developmental Biology
|July 12, 2005
Summary
Male-specific cell migration into embryonic gonads is crucial for testis development and is conserved in mammals and birds. This process relies on Platelet-Derived Growth Factor (PDGF) signaling, a key pathway in gonadal sex differentiation.
Area of Science:
- Developmental Biology
- Cell Biology
- Genetics
Background:
- Testis formation in mice requires male-specific migration of mesonephric kidney cells.
- The conservation and underlying signaling of this migratory process in other vertebrates remain unclear.
- Previous speculation suggested male-specific cell migration might be limited to mammals.
Purpose of the Study:
- To investigate if male-specific cell migration is conserved in non-mammalian vertebrates.
- To identify the signaling molecules involved in this conserved migratory process.
- To elucidate the role of Platelet-Derived Growth Factor (PDGF) signaling in gonadal sex differentiation.
Main Methods:
- Interspecific co-cultures of embryonic quail mesonephric kidneys and chicken gonads.
- Co-culture of GFP-labeled mouse mesonephric kidneys with embryonic chicken gonads.
- Analysis of gene expression for PDGF-A, PDGF receptor-alpha, and PI3KC2alpha.
- Inhibition of PDGF signaling using AG1296 (tyrphostin) in organ cultures.
Main Results:
- Quail cells migrated specifically into male chicken gonads, confirming conservation in birds.
- Mouse cells also migrated specifically into male chicken gonads, demonstrating cross-species recognition.
- PDGF signaling components (PDGF-A, PDGF receptor-alpha) and PI3KC2alpha were male-specifically upregulated.
- Inhibition of PDGF receptor signaling impaired mesonephric cell migration in both avian and mammalian systems.
Conclusions:
- Male-specific mesonephric cell migration is a conserved mechanism for testis formation in higher vertebrates.
- Platelet-Derived Growth Factor (PDGF) signaling is a conserved pathway essential for this migration.
- This conserved cellular event is an indirect consequence of Sry expression in mammals.