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Conserved lamin A protein expression in differentiated cells in the earthworm Eudrilus eugeniae
Ramamoorthy M Kalidas1, Subramanian Elaiya Raja1, Sheik Abdul Kader Nagoor Meeran Mydeen1
1Department of Biotechnology, Manonmaniam Sundaranar University, Tirunelveli-627012, Tamilnadu, India.
Cell Biology International
|April 11, 2015
Summary
Lamin A protein, crucial for cell structure, is absent in stem cells but present in differentiated cells. This study confirms lamin A
Area of Science:
- Cell Biology
- Developmental Biology
- Biochemistry
Background:
- Lamin A is an intermediate filament protein essential for the nuclear structure in differentiated vertebrate cells.
- Its expression and function in invertebrates, particularly in relation to stem cells and regeneration, are poorly understood.
- The earthworm Eudrilus eugeniae serves as a model organism for studying tissue regeneration.
Purpose of the Study:
- To investigate the sequence, immunochemical conservation, and expression pattern of lamin A in the earthworm Eudrilus eugeniae.
- To compare the expression of lamin A with Oct-4, a marker for undifferentiated cells, in regenerating tissues and the prostate gland.
- To provide the first evidence of lamin A and Oct-4 immunochemical identification in earthworms.
Main Methods:
- Immunoblotting was used to confirm the presence of lamin A in E. eugeniae.
- Immunohistochemistry with antibodies against human lamin A peptides localized the protein within the nuclear membrane.
- Partial genome sequencing provided sequence information for earthworm lamin A.
Main Results:
- Lamin A was immunochemically identified in E. eugeniae, with antibodies detecting a 65 kDa protein, distinct from the 70 kDa protein in mice.
- Lamin A expression was observed in differentiated cells but notably absent in Oct-4 positive undifferentiated blastemal tissues of regenerating earthworms.
- This expression pattern of lamin A inversely correlating with Oct-4 was also confirmed in the earthworm prostate gland.
Conclusions:
- The study provides the first immunochemical identification of lamin A and Oct-4 in the earthworm.
- The findings suggest that the expression pattern of lamin A, being excluded from stem/undifferentiated cells and present in differentiated cells, is conserved from invertebrates to humans.
- Lamin A plays a conserved role in cellular differentiation across species.
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