TY - JOUR
T1 - Lamin B is a prompt heat shock protein
AU - Dynlacht, Joseph R.
AU - Story, Michael D.
AU - Zhu, Wei Guo
AU - Danner, Jeffrey
PY - 1999/1
Y1 - 1999/1
N2 - The cellular response to hyperthermia involves the increased synthesis of heat shock proteins (HSPs) within several hours after treatment. In addition, a subset of proteins has been shown to be increased immediately after heating. These 'prompt' HSPs are predominantly found in the nuclear matrix-intermediate filament fraction and are not present or detectable in unheated cells. Since the nuclear matrix has been suggested to be a target for heat-induced cell killing, prompt HSPs may play a prominent role in the heat shock response. Using Western blotting and flow cytometry, we found that an increase in the synthesis of lamin B, one of the major proteins of the nuclear lamina, is induced during heating at 45.5°C but not during heating at 42°C. Since it is an abundant protein which is constitutively expressed in mammalian cells, lamin B appears to be a unique member of the prompt HSP family. The kinetics of induction of lamin B during 45.5°C heating did not correlate with the dose-dependent reduction in cell survival. While increased levels of lamin B during 45.5°C heating do not appear to confer a survival advantage directly, a possible role for lamin B in cellular recovery after heat shock cannot be discounted.
AB - The cellular response to hyperthermia involves the increased synthesis of heat shock proteins (HSPs) within several hours after treatment. In addition, a subset of proteins has been shown to be increased immediately after heating. These 'prompt' HSPs are predominantly found in the nuclear matrix-intermediate filament fraction and are not present or detectable in unheated cells. Since the nuclear matrix has been suggested to be a target for heat-induced cell killing, prompt HSPs may play a prominent role in the heat shock response. Using Western blotting and flow cytometry, we found that an increase in the synthesis of lamin B, one of the major proteins of the nuclear lamina, is induced during heating at 45.5°C but not during heating at 42°C. Since it is an abundant protein which is constitutively expressed in mammalian cells, lamin B appears to be a unique member of the prompt HSP family. The kinetics of induction of lamin B during 45.5°C heating did not correlate with the dose-dependent reduction in cell survival. While increased levels of lamin B during 45.5°C heating do not appear to confer a survival advantage directly, a possible role for lamin B in cellular recovery after heat shock cannot be discounted.
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U2 - 10.1002/(SICI)1097-4652(199901)178:1<28::AID-JCP4>3.0.CO;2-K
DO - 10.1002/(SICI)1097-4652(199901)178:1<28::AID-JCP4>3.0.CO;2-K
M3 - Article
C2 - 9886487
AN - SCOPUS:3743147224
SN - 0021-9541
VL - 178
SP - 28
EP - 34
JO - Journal of cellular physiology
JF - Journal of cellular physiology
IS - 1
ER -