Related Experiment Videos
Calmodulin-activated calcium ATPase in bipolar illness.
H L Meltzer1, S Kassir, P J Goodnick
1New York State Psychiatric Institute, New York.
Neuropsychobiology
|January 1, 1988
Summary
Bipolar disorder is linked to higher levels of a key calcium transport enzyme in red blood cells. This enzyme, calmodulin-activated calcium ATPase, plays a crucial role in maintaining normal intracellular calcium.
Area of Science:
- Biochemistry
- Cellular Biology
- Neuroscience
Background:
- Intracellular ionized calcium homeostasis is critical for normal cellular function.
- Calmodulin-activated calcium ATPase (Ca2+-ATPase) is the primary enzyme responsible for maintaining low intracellular calcium levels.
Purpose of the Study:
- To quantify key parameters of erythrocyte Ca2+-ATPase in bipolar disorder.
- To investigate potential alterations in Ca2+-ATPase concentration, maximal velocity, and calmodulin binding affinity in bipolar subjects.
Main Methods:
- Erythrocyte membranes were isolated from lithium carbonate-treated bipolar subjects and healthy controls.
- Enzyme parameters including E-t (concentration in membrane), Vmax (maximal velocity), and Ka (binding affinity for calmodulin) were determined.
Main Results:
- Significantly increased levels of E-t (membrane concentration) were observed in erythrocyte membranes from bipolar subjects compared to controls.
- No significant differences were found in Vmax or Ka between the two groups.
Conclusions:
- Elevated Ca2+-ATPase concentration in erythrocytes may be a biomarker associated with bipolar disorder.
- The findings suggest a specific alteration in enzyme quantity rather than its catalytic activity or calmodulin binding in this patient group.