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Metallothionein in platelets
1Department of Immunology, School of Medicine, University of Occupational and Environmental Health, Japan, Kitakyushu.
International Archives of Allergy and Immunology
|January 1, 1994
Summary
Platelets contain significantly higher zinc levels than other blood cells, primarily bound to metallothionein (MT). This study confirms the presence of MT in platelets, though its exact function remains under investigation.
Area of Science:
- Biochemistry
- Hematology
- Toxicology
Background:
- Platelets are known to accumulate various metals.
- Metallothioneins (MTs) are crucial proteins involved in metal homeostasis and detoxification.
- The presence and role of MTs in platelets have not been extensively studied.
Purpose of the Study:
- To determine the zinc content in platelets of rabbits, humans, and horses.
- To identify the protein bound to zinc in platelet lysates.
- To quantify metallothionein (MT) concentrations in platelets.
Main Methods:
- Quantification of zinc content in platelet cells and supernatants.
- Gel filtration analysis to determine the molecular weight of zinc-binding proteins.
- Enzyme-linked immunoassay and immunoblotting using monoclonal antibodies to identify metallothionein (MT).
Main Results:
- Platelets exhibit significantly higher zinc levels (3 µg/10^10 cells) compared to other peripheral blood cells.
- Approximately 70% of zinc in platelet lysates is associated with a low-molecular-weight protein (6,000–8,000 MW).
- This protein was identified as metallothionein (MT) based on antigenic properties; concentrations were 30.5 ± 3.7 (rabbit), 39.4 ± 4.2 (human), and 39.7 ± 4.4 µg/10^10 cells (horse).
Conclusions:
- Metallothionein (MT) is present in platelets of rabbits, humans, and horses.
- Platelet MT may play a role in regulating metal homeostasis or preserving essential metals for cellular functions.
- Further research is needed to elucidate the specific biological functions of MT in platelets.