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Lactoferrin binding sites and nuclear localization in K562(S) cells.
C Garré1, G Bianchi-Scarrá, M Sirito
1Institute of Biology and Genetics, University of Genova, Italy.
Journal of Cellular Physiology
|December 1, 1992
Summary
Lactoferrin binds to specific sites on K562 cells, is internalized, and detected linked to DNA in nuclear extracts. This glycoprotein regulates myelopoiesis and interacts with hematopoietic cells.
Area of Science:
- Hematology
- Molecular Biology
- Cell Biology
Background:
- Lactoferrin, a cationic glycoprotein from neutrophil granules, regulates myelopoiesis.
- Specific lactoferrin receptors exist on hematopoietic cells, influencing cell growth.
- Lactoferrin has demonstrated interactions with DNA.
Purpose of the Study:
- To confirm lactoferrin binding sites on K562 cells.
- To quantify these binding sites and determine the dissociation constant.
- To investigate lactoferrin internalization and its association with DNA.
Main Methods:
- Western blotting analysis of K562 cell lysates.
- Detection of lactoferrin binding sites on K562 cells.
- Temperature-dependent internalization studies and nuclear extract analysis.
Main Results:
- Specific lactoferrin binding sites were confirmed on K562 cells.
- A 120 kDa protein band responsible for lactoferrin binding was identified via Western blotting.
- Lactoferrin internalization was observed in a temperature-dependent manner.
- Lactoferrin was detected as a DNA-linked protein within nuclear extracts.
Conclusions:
- K562 cells possess specific lactoferrin binding sites with quantifiable characteristics.
- Lactoferrin is internalized by K562 cells and associates with DNA within the nucleus.
- These findings contribute to understanding lactoferrin's role in hematopoietic cell regulation.