open access

Vol 64, No 3 (2013)
Original papers
Published online: 2013-07-01
Submitted: 2013-07-31
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Determining the enzymatic activities of iodothyronine 5’-deiodinases in renal medulla and cortex

Stanisław Niemczyk, Marta Dudek, Zbigniew Bartoszewicz, Katarzyna Szamotulska, Łukasz Woźniacki, Dorota Brodowska-Kania, Longin Niemczyk, Władysław Małek, Joanna Matuszkiewicz-Rowińska
Endokrynologia Polska 2013;64(3):182-185.

open access

Vol 64, No 3 (2013)
Original papers
Published online: 2013-07-01
Submitted: 2013-07-31

Abstract


Introduction: Thyroid hormone disorders in patients with chronic kidney disease (CKD) are a result of impaired conversion of T4 to T3. The importance of kidneys in thyroid hormones conversion is not fully understood. The activities of different types of iodothyronine deiodinases in the kidney structures have not been determined yet. The aim of this study was to determine the activity of deiodinase type 1 (D1) and type 2 (D2) in renal cortex and medulla in renal cancer patients.
Material and methods: Samples of renal cortex and medulla (ten patients) or renal cortex alone (13 patients) were taken from kidneys resected because of malignant cancer, from a site opposite to the cancer. Resections were performed in the 23 patients (seven female and 16 male) who were 52–82 years old. The material was stored at –72 oC.
Results: Activity of D1 in renal cortex was 3.785 ± 2.041 fmol 125I/mg protein/minute and activity of D2 was 0.236 ± 0.125 fmol 125I/mg protein/minute. There was a strong positive correlation between D1 and D2 activities in renal cortex (r = 0.890, p < 0.001). Activity of D1 in renal medulla was 2.157 ± 2.176 fmol 125I/mg protein/minute, and activity of D2 was 0.168 ± 0.095 fmol 125I/mg protein/minute. A positive correlation between D1 and D2 in renal medulla (r = 0.661, p = 0.038) was observed as well. Activities of D1 in cortex and medulla were strongly and positively associated (r = 0.794, p = 0.006), whereas there was no correlation between the activities of D2 in cortex and medulla (r = 0.224, p = 0.553).
Conclusions: Results presented in this study suggest that both cortical and medullary D1 and D2 may be involved in thyroid hormone metabolism. This finding could be of clinical relevance in patients with impaired renal function. (Endokrynol Pol 2013; 64 (3): 182–185)

Abstract


Introduction: Thyroid hormone disorders in patients with chronic kidney disease (CKD) are a result of impaired conversion of T4 to T3. The importance of kidneys in thyroid hormones conversion is not fully understood. The activities of different types of iodothyronine deiodinases in the kidney structures have not been determined yet. The aim of this study was to determine the activity of deiodinase type 1 (D1) and type 2 (D2) in renal cortex and medulla in renal cancer patients.
Material and methods: Samples of renal cortex and medulla (ten patients) or renal cortex alone (13 patients) were taken from kidneys resected because of malignant cancer, from a site opposite to the cancer. Resections were performed in the 23 patients (seven female and 16 male) who were 52–82 years old. The material was stored at –72 oC.
Results: Activity of D1 in renal cortex was 3.785 ± 2.041 fmol 125I/mg protein/minute and activity of D2 was 0.236 ± 0.125 fmol 125I/mg protein/minute. There was a strong positive correlation between D1 and D2 activities in renal cortex (r = 0.890, p < 0.001). Activity of D1 in renal medulla was 2.157 ± 2.176 fmol 125I/mg protein/minute, and activity of D2 was 0.168 ± 0.095 fmol 125I/mg protein/minute. A positive correlation between D1 and D2 in renal medulla (r = 0.661, p = 0.038) was observed as well. Activities of D1 in cortex and medulla were strongly and positively associated (r = 0.794, p = 0.006), whereas there was no correlation between the activities of D2 in cortex and medulla (r = 0.224, p = 0.553).
Conclusions: Results presented in this study suggest that both cortical and medullary D1 and D2 may be involved in thyroid hormone metabolism. This finding could be of clinical relevance in patients with impaired renal function. (Endokrynol Pol 2013; 64 (3): 182–185)
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Keywords

deiodinase; iodothyronine 5’-deiodinase; thyroid hormones; kidney; cortex; medulla

About this article
Title

Determining the enzymatic activities of iodothyronine 5’-deiodinases in renal medulla and cortex

Journal

Endokrynologia Polska

Issue

Vol 64, No 3 (2013)

Pages

182-185

Published online

2013-07-01

Bibliographic record

Endokrynologia Polska 2013;64(3):182-185.

Keywords

deiodinase
iodothyronine 5’-deiodinase
thyroid hormones
kidney
cortex
medulla

Authors

Stanisław Niemczyk
Marta Dudek
Zbigniew Bartoszewicz
Katarzyna Szamotulska
Łukasz Woźniacki
Dorota Brodowska-Kania
Longin Niemczyk
Władysław Małek
Joanna Matuszkiewicz-Rowińska

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