Renal expression of the brain and muscle isoforms of glycogen phosphorylase in different cell types.
Kidney contains glycogen. Glycogen is degraded by glycogen phosphorylase (GP). This enzyme comes in three isoforms, one of which, the brain isozyme (GP BB), is known to occur in kidney. Its pattern of distribution in rat kidney was studied in comparison to that of the muscle isoform (GP MM) with the aim to see if for GP BB and GP MM there were functional similarities in brain and kidney. In immunoblotting and quantitative reverse transcriptase polymerase chain reaction (RT-PCR) experiments, both isozymes and their respective mRNAs were found in kidney homogenates. GP BB was immunocytochemically detected in collecting ducts which were identified by the marker protein aquaporin-2. GP MM was localized exclusively in interstitial cells of cortex and outer medulla. These cells were identified as fibroblasts by their expression of 5'-ectonucleotidase (cortex) or by their morphology (outer medulla). The physiological role of both isozymes is discussed in respect to local demands of energy and of proteoglycan building blocks.
Schmid
Heide
H
Interfaculty Institute for Biochemistry, University of Tuebingen, Hoppe-Seyler-Str. 4, 72076, Tuebingen, Germany.
Dolderer
Benedikt
B
Thiess
Ulrike
U
Verleysdonk
Stephan
S
Hamprecht
Bernd
B
D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D001921:Brain / Q000201:enzymology*; D017931:DNA Primers; D004591:Electrophoresis, Polyacrylamide Gel; D024981:Glycogen Phosphorylase / Q000235:genetics / Q000378:metabolism*; D007150:Immunohistochemistry; D007527:Isoenzymes / Q000235:genetics / Q000378:metabolism*; D007668:Kidney / Q000201:enzymology*; D008297:Male; D008969:Molecular Sequence Data; D009132:Muscles / Q000201:enzymology*; D012333:RNA, Messenger / Q000235:genetics; D051381:Rats; D017208:Rats, Wistar; D020133:Reverse Transcriptase Polymerase Chain Reaction
D017931:DNA Primers; D007527:Isoenzymes; D012333:RNA, Messenger; D024981:Glycogen Phosphorylase