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Cellular and tissue expression of DAPIT, a phylogenetically conserved peptide
European Journal of Histochemistry : EJH
|June 13, 2012
Summary
Diabetes Associated Protein in Insulin-sensitive Tissues (DAPIT) is found in mitochondria and lysosomes. This protein is highly expressed in tissues with high energy needs, suggesting a role in proton pumps.
Area of Science:
- Biochemistry
- Cell Biology
- Molecular Biology
Background:
- Diabetes Associated Protein in Insulin-sensitive Tissues (DAPIT) is a conserved peptide.
- DAPIT mRNA is downregulated in type 1 diabetes rat tissues.
- Its cellular functions and localization were previously uncharacterized.
Purpose of the Study:
- To characterize a custom antibody against DAPIT.
- To confirm the cellular localization of DAPIT.
- To investigate the tissue expression of DAPIT in rats and humans.
Main Methods:
- Custom antibody generation and characterization.
- Immunofluorescence microscopy to determine cellular localization.
- Histological analysis of DAPIT expression in various tissues.
Main Results:
- Confirmed DAPIT's presence in mitochondria and lysosomes of HUVEC and HEK 293T cells.
- Demonstrated high DAPIT expression in rat and human tissues with high aerobic metabolism.
- Observed DAPIT expression in epithelial cells involved in active nutrient and ion transport.
Conclusions:
- DAPIT is localized in both mitochondria and lysosomes.
- High expression in metabolically active tissues suggests a role in energy-intensive processes.
- DAPIT may be a subunit of both mitochondrial F-ATPase and lysosomal V-ATPase, indicating a role in proton pumps.
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