Related Experiment Videos
Subcellular localization of presenilins during mouse preimplantation development.
Summary
Presenilins (PSs), linked to Alzheimer's disease, are found in the nucleus during early mouse development and are crucial for cell division and differentiation. Their nuclear presence disappears by the blastocyst stage.
Area of Science:
- Developmental Biology
- Cell Biology
- Neuroscience
Background:
- Familial Alzheimer's disease is associated with mutations in genes encoding presenilins (PSs).
- Presenilin expression and processing are regulated during neuronal development.
- The subcellular localization of presenilins during early development is largely unknown.
Purpose of the Study:
- To investigate the subcellular localization of presenilins during early mouse embryonic development.
- To elucidate the role of presenilins in cell division and differentiation during early development.
Main Methods:
- Utilized a mouse embryo model to track presenilin localization from oocyte to blastocyst stages.
- Employed antisense oligonucleotides against PS1 and PS2 to assess their role in blastocyst transition.
- Used lactacystin (a proteasome inhibitor) and PS2 overexpression in HEK 293 cells to study cell cycle effects.
Main Results:
- Presenilins were detected in the nucleus from oocyte to 2.5 days postcoitum (dpc), disappearing at the blastocyst stage (3.5 dpc).
- Combined antisense against PS1 and PS2 inhibited the transition to blastocyst, while individual antisense had no effect.
- Lactacystin treatment redistributed presenilins to the centrosome-kinetochore microtubule, and PS2 overexpression arrested cells in S phase.
Conclusions:
- Presenilins exhibit dynamic nuclear localization during early embryonic development.
- Presenilins play critical roles in cell division and differentiation, impacting early developmental transitions.