Expression of translationally controlled tumor protein in heat-stressed human dental pulp cells.
OBJECTIVE
The aim of this study was to investigate the effects of heat stress on cell viability, translationally controlled tumor protein (TCTP) expression, and the effects of recombinant TCTP on heat-stressed human dental pulp cells (HDPCs).


METHODS
HDPCs were isolated from human teeth and cultured at 37°C. For heat stress, HPDCs were incubated at 43°C for 45min. After heat stress, recombinant TCTP were added to HDPCs and cultured for various periods of time at 37°C. Heat-treated cells were then analyzed by DNA staining with Hoechst 33258, MTT, and caspase 3 activity assays. TCTP expression level was assessed by real-time PCR and western blot analysis.


RESULTS
Heat-treated cells displayed lower cell density and nuclear morphology resembling apoptotic body. Heat stress significantly decreased cell viability and induced activity of caspase 3. The effect of recombinant TCTP on pulp cell death from heat stress varied depending on each subject and TCTP concentration. Heat stress up-regulated TCTP mRNA expression level. In contrast, TCTP protein level remained unchanged. Recombinant TCTP did not affect TCTP mRNA expression but down-regulated TCTP protein in heat-treated cells.


CONCLUSIONS
Heat stress induces caspase 3 activation and up-regulates TCTP mRNA expression in HDPCs. TCTP did not play a key role on pulp cell recovery from heat stress.
['Jirachotikoon|Canussanun|C|', 'Tannukit|Sissada|S|', 'Kedjarune-Leggat|Ureporn|U|']
D000293:Adolescent D000328:Adult D000818:Animals D014408:Biomarkers, Tumor D053148:Caspase 3 D016923:Cell Death D002470:Cell Survival D002478:Cells, Cultured D003782:Dental Pulp D015536:Down-Regulation D004789:Enzyme Activation D005786:Gene Expression Regulation D006358:Hot Temperature D006801:Humans D033561:Penaeidae D012333:RNA, Messenger D060888:Real-Time Polymerase Chain Reaction D011994:Recombinant Proteins D000090324:Tumor Protein, Translationally-Controlled 1 D015854:Up-Regulation D055815:Young Adult
Dental pulp Heat stress TCTP Apoptosis