Cellular redistribution of inducible Hsp70 protein in the human and rabbit heart in response to the stress of chronic hypoxia: role of protein kinases,.
Many infants who undergo cardiac surgery have a congenital cyanotic defect where the heart is chronically perfused with hypoxemic blood. Infant hearts adapt to chronic hypoxemia by activation of intracellular protein kinase signal transduction pathways. However, the involvement of heat shock protein 70 in adaptation to chronic hypoxemia and its role in protein kinase signaling pathways is unknown. We determined expression of message and subcellular protein distribution for inducible (Hsp70i) and constitutive heat shock protein 70 (Hsc70) in chronically hypoxic and normoxic infant human and rabbit hearts and their relationship to protein kinases. In chronically hypoxic human and rabbit hearts message levels for Hsp70i were elevated 4- to 5-fold compared with normoxic hearts, Hsp70i protein was redistributed from the particulate to the cytosolic fraction. In normoxic infants Hsp70i protein was distributed almost equally between the cytosolic and particulate fractions. Hsc70 message and subcellular distribution of Hsc70 protein were unaffected by chronic hypoxia. We then determined if protein kinases influence Hsp70i protein subcellular distribution. In rabbit hearts SB203580 and chelerythrine reduced Hsp70i message levels, whereas SB203580, chelerythrine, and curcumin reversed the subcellular redistribution of Hsp70i protein caused by chronic hypoxia, with no effect in normoxic hearts, indicating regulation of Hsp70i message and subcellular distribution of Hsp70i protein in chronically hypoxic rabbit hearts is influenced by protein kinase C and mitogen-activated protein kinases, specifically p38 MAPK and JNK. We conclude the Hsp70 signal transduction pathway plays an important role in adaptation of infant human and rabbit hearts to chronic hypoxemia.
Rafiee
Parvaneh
P
Division of Pediatric Surgery, Medical College of Wisconsin and Children's Hospital of Wisconsin, Milwaukee, Wisconsin 53226, USA.
Shi
Yang
Y
Pritchard
Kirkwood A
KA
Ogawa
Hitoshi
H
Eis
Annie L W
AL
Komorowski
Richard A
RA
Fitzpatrick
Colleen M
CM
Tweddell
James S
JS
Litwin
S Bert
SB
Mussatto
Kathleen
K
Jaquiss
Robert D
RD
Baker
John E
JE
D000470:Alkaloids; D000818:Animals; D053119:Benzophenanthridines; D015153:Blotting, Western; D003474:Curcumin / Q000494:pharmacology; D004591:Electrophoresis, Polyacrylamide Gel; D004791:Enzyme Inhibitors / Q000494:pharmacology; D005260:Female; D050883:HSC70 Heat-Shock Proteins; D018840:HSP70 Heat-Shock Proteins / Q000096:biosynthesis*; D006321:Heart / Q000502:physiology; D006419:Heme Oxygenase (Decyclizing) / Q000378:metabolism; D051547:Heme Oxygenase-1; D006801:Humans; D000860:Hypoxia; D007093:Imidazoles / Q000494:pharmacology; D007150:Immunohistochemistry; D007223:Infant; D007231:Infant, Newborn; D007511:Ischemia; D020935:MAP Kinase Signaling System; D008297:Male; D008565:Membrane Proteins; D009206:Myocardium / Q000378:metabolism*; D010617:Phenanthridines / Q000494:pharmacology; D011493:Protein Kinase C / Q000378:metabolism; D011725:Pyridines / Q000494:pharmacology; D012333:RNA, Messenger / Q000378:metabolism; D011817:Rabbits; D020133:Reverse Transcriptase Polymerase Chain Reaction; D015398:Signal Transduction; D013997:Time Factors
D000470:Alkaloids; D053119:Benzophenanthridines; D004791:Enzyme Inhibitors; D050883:HSC70 Heat-Shock Proteins; D018840:HSP70 Heat-Shock Proteins; C494371:HSPA8 protein, human; D007093:Imidazoles; D008565:Membrane Proteins; D010617:Phenanthridines; D011725:Pyridines; D012333:RNA, Messenger; C016299:chelerythrine; C496541:HMOX1 protein, human; D006419:Heme Oxygenase (Decyclizing); D051547:Heme Oxygenase-1; D011493:Protein Kinase C; D003474:Curcumin; C093642:SB 203580