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Thallium-201 (201Tl) distributes into red blood cells and plasma. Cellular uptake involves the Na, K-ATPase, with 201Tl retained within erythrocytes.
Area of Science:
- Biochemistry
- Radiopharmacology
Background:
- Thallium-201 (201Tl) is a radiotracer used in medical imaging.
- Understanding its distribution in blood components is crucial for interpreting imaging results.
Purpose of the Study:
- To investigate the in vivo and in vitro distribution of Thallium-201 in blood.
- To elucidate the mechanism of Thallium-201 uptake and retention in erythrocytes.
Main Methods:
- In vivo and in vitro experiments using Thallium-201.
- Analysis of Thallium-201 distribution between erythrocytes and plasma.
- Investigating the effect of temperature, ouabain, and KCl on erythrocyte uptake.
Main Results:
- Immediately after administration, 201Tl distributed into erythrocytes and plasma at a ratio of 1.4:1.0.
- Erythrocyte uptake of 201Tl was influenced by incubation temperature and the presence of ouabain and KCl, suggesting Na, K-ATPase involvement.
- 201Tl was retained within erythrocytes, while present as a free ion in plasma.
- The erythrocyte/plasma ratio increased to 1.9:1.0 as 201Tl moved out of erythrocytes.
Conclusions:
- Thallium-201 distribution in blood involves both plasma and erythrocytes.
- Erythrocyte uptake of 201Tl is partially mediated by the Na, K-ATPase.
- Erythrocytes act as a significant reservoir for Thallium-201.
Abstract:
Thallium-201 distribution in the blood was investigated both in vivo and in vitro. Thallium-201 was distributed into the erythrocytes and plasma with the ratio of 1.4 +/- 0.3 to 1.0, immediately after its administration. The uptake of 201Tl into the erythrocytes in vitro were affected by the incubation temperature and the presence of ouabain and KCl; indicating that the 201Tl was uptaken into cells partly through their membranes Na, K-ATPase. Erythrocytes could retain 201Tl in it, whereas 201Tl was present as free ion in the plasma. Thallium-201 was flew out of erythrocytes into the plasma, keeping the ratio of 201Tl in erythrocytes/plasma to be 1.9 +/- 0.2/1.0.