Biomaterial Database

Antisense palmitoyl protein thioesterase 1 (PPT1) treatment inhibits PPT1 activity and increases cell death in LA-N-5 neuroblastoma cells. 2000

S Cho, and P E Dawson, and G Dawson

Departments of Pediatrics, Biochemistry and Molecular Biology, University of Chicago, Chicago, Illinois, USA.

Infantile neuronal ceroid lipofuscinosis (INCL) is a childhood neurodegenerative disease caused by the selective death of cortical neurons and retinal degeneration, as the result of a palmitoyl protein thioesterase 1 (PPT1) deficiency. Recently, we showed that overexpression of PPT1 protects LA-N-5 human neuroblastoma cells against apoptotic death (Cho and Dawson [2000a] J. Neurochem. 74:1478-1488) and we now show that inhibition of PPT1 increases the susceptibility of these cells to apoptotic cell death. Transient transfection of LA-N-5 neuroblastoma cells with PPT1-FLAG resulted in a strong expression of PPT-FLAG-tagged protein as evidenced by Western blot analysis and immunofluorescence. Co-transfection of a reverse-oriented (antisense) PPT1 (AS-PPT1) decreased the expression of PPT-FLAG to almost zero, reduced PPT1 enzyme activity (as measured by an in vitro assay) and increased the susceptibility to apoptosis induced by C(2) ceramide. Similarly, inhibition of PPT1 with a synthetic inhibitor (AcG-palmitoyl diaminoproprionate-VKIKK) (DAP1) (100 microM) increased the susceptibility of the cells to apoptosis induced by either C(2)-ceramide or etoposide, a common chemotherapeutic agent used in the treatment of neuroblastoma. Cells stably overexpressing PPT1 were resistant to apoptosis induced by DAP1 suggesting that the inhibitor has a specific action and confirming that low levels of protein palmitoylation block the death pathway. Drugs that raise the level of protein palmitoylation are pro-apoptotic and PPT1 inhibition may enhance the killing efficacy of chemotherapeutic agents used to kill neuroblastoma-derived cells.

UI	MeSH Term	Description	Entries
D009447	Neuroblastoma	A common neoplasm of early childhood arising from neural crest cells in the sympathetic nervous system, and characterized by diverse clinical behavior, ranging from spontaneous remission to rapid metastatic progression and death. This tumor is the most common intraabdominal malignancy of childhood, but it may also arise from thorax, neck, or rarely occur in the central nervous system. Histologic features include uniform round cells with hyperchromatic nuclei arranged in nests and separated by fibrovascular septa. Neuroblastomas may be associated with the opsoclonus-myoclonus syndrome. (From DeVita et al., Cancer: Principles and Practice of Oncology, 5th ed, pp2099-2101; Curr Opin Oncol 1998 Jan;10(1):43-51)	Neuroblastomas
D009472	Neuronal Ceroid-Lipofuscinoses	A group of severe neurodegenerative diseases characterized by intracellular accumulation of autofluorescent wax-like lipid materials (CEROID; LIPOFUSCIN) in neurons. There are several subtypes based on mutations of the various genes, time of disease onset, and severity of the neurological defects such as progressive DEMENTIA; SEIZURES; and visual failure.	Batten Disease,Ceroid Lipofuscinosis, Neuronal, 4B, Autosomal Dominant,Ceroid-Lipofuscinosis, Neuronal,Jansky-Bielschowsky Disease,Kufs Disease,Santavuori-Haltia Disease,Spielmeyer-Vogt Disease,Adult Neuronal Ceroid Lipofuscinosis,Amaurotic Idiocy, Adult Type,Batten-Mayou Disease,Batten-Spielmeyer-Vogt Disease,CLN3-Related Neuronal Ceroid-Lipofuscinosis,CLN4A,CLN4B,Ceroid Lipofuscinosis, Neuronal 3, Juvenile,Ceroid Lipofuscinosis, Neuronal 4,Ceroid Lipofuscinosis, Neuronal, 3,Ceroid Lipofuscinosis, Neuronal, 4A, Autosomal Recessive,Ceroid Lipofuscinosis, Neuronal, Parry Type,Ceroid Storage Disease,Infantile Neuronal Ceroid Lipofuscinosis,Juvenile Batten Disease,Juvenile Cerebroretinal Degeneration,Juvenile Neuronal Ceroid Lipofuscinosis,Kuf's Disease,Kufs Disease Autosomal Recessive,Kufs Disease, Autosomal Dominant,Kufs Disease, Autosomal Recessive,Kufs Type Neuronal Ceroid Lipofuscinosis,Late-Infantile Neuronal Ceroid Lipofuscinosis,Lipofuscin Storage Disease,Lipofuscinosis, Neuronal Ceroid,Neuronal Ceroid Lipofuscinosis,Neuronal Ceroid Lipofuscinosis Juvenile Type,Neuronal Ceroid Lipofuscinosis, Adult,Neuronal Ceroid Lipofuscinosis, Adult Type,Neuronal Ceroid Lipofuscinosis, Infantile,Neuronal Ceroid Lipofuscinosis, Juvenile,Neuronal Ceroid Lipofuscinosis, Late Infantile,Neuronal Ceroid Lipofuscinosis, Late-Infantile,Neuronal Ceroid-Lipofuscinosis,Spielmeyer-Sjogren Disease,Vogt Spielmeyer Disease,Vogt-Spielmeyer Disease,Batten Disease, Juvenile,Batten Diseases, Juvenile,Batten Mayou Disease,Batten Spielmeyer Vogt Disease,CLN3 Related Neuronal Ceroid Lipofuscinosis,CLN3-Related Neuronal Ceroid-Lipofuscinoses,CLN4As,Cerebroretinal Degeneration, Juvenile,Cerebroretinal Degenerations, Juvenile,Ceroid Lipofuscinosis, Neuronal,Ceroid Storage Diseases,Ceroid-Lipofuscinosis, CLN3-Related Neuronal,Disease, Ceroid Storage,Disease, Juvenile Batten,Disease, Kuf's,Disease, Lipofuscin Storage,Disease, Spielmeyer-Sjogren,Disease, Vogt Spielmeyer,Disease, Vogt-Spielmeyer,Jansky Bielschowsky Disease,Juvenile Batten Diseases,Juvenile Cerebroretinal Degenerations,Kuf Disease,Lipofuscin Storage Diseases,Neuronal Ceroid Lipofuscinoses,Neuronal Ceroid-Lipofuscinoses, CLN3-Related,Neuronal Ceroid-Lipofuscinosis, CLN3-Related,Santavuori Haltia Disease,Spielmeyer Disease, Vogt,Spielmeyer Sjogren Disease,Spielmeyer Vogt Disease,Storage Disease, Ceroid,Storage Disease, Lipofuscin
D009944	Organoplatinum Compounds	Organic compounds which contain platinum as an integral part of the molecule.	Compounds, Organoplatinum
D010170	Palmitoyl-CoA Hydrolase	Enzyme catalyzing reversibly the hydrolysis of palmitoyl-CoA or other long-chain acyl coenzyme A compounds to yield CoA and palmitate or other acyl esters. The enzyme is involved in the esterification of fatty acids to form triglycerides. EC 3.1.2.2.	Acyl CoA Hydrolase,Fatty Acyl Thioesterase,Palmitoyl CoA Deacylase,Palmitoyl Coenzyme A Hydrolase,Palmitoyl Thioesterase,Long-Chain Fatty-Acyl-CoA Hydrolase,Oleoyl-CoA Acylhydrolase,Stearoyl CoA Hydrolase,Thioesterase I,Acylhydrolase, Oleoyl-CoA,CoA Deacylase, Palmitoyl,CoA Hydrolase, Acyl,CoA Hydrolase, Stearoyl,Deacylase, Palmitoyl CoA,Fatty-Acyl-CoA Hydrolase, Long-Chain,Hydrolase, Acyl CoA,Hydrolase, Long-Chain Fatty-Acyl-CoA,Hydrolase, Palmitoyl-CoA,Hydrolase, Stearoyl CoA,Long Chain Fatty Acyl CoA Hydrolase,Oleoyl CoA Acylhydrolase,Palmitoyl CoA Hydrolase,Thioesterase, Fatty Acyl,Thioesterase, Palmitoyl
D006801	Humans	Members of the species Homo sapiens.	Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D000970	Antineoplastic Agents	Substances that inhibit or prevent the proliferation of NEOPLASMS.	Anticancer Agent,Antineoplastic,Antineoplastic Agent,Antineoplastic Drug,Antitumor Agent,Antitumor Drug,Cancer Chemotherapy Agent,Cancer Chemotherapy Drug,Anticancer Agents,Antineoplastic Drugs,Antineoplastics,Antitumor Agents,Antitumor Drugs,Cancer Chemotherapy Agents,Cancer Chemotherapy Drugs,Chemotherapeutic Anticancer Agents,Chemotherapeutic Anticancer Drug,Agent, Anticancer,Agent, Antineoplastic,Agent, Antitumor,Agent, Cancer Chemotherapy,Agents, Anticancer,Agents, Antineoplastic,Agents, Antitumor,Agents, Cancer Chemotherapy,Agents, Chemotherapeutic Anticancer,Chemotherapy Agent, Cancer,Chemotherapy Agents, Cancer,Chemotherapy Drug, Cancer,Chemotherapy Drugs, Cancer,Drug, Antineoplastic,Drug, Antitumor,Drug, Cancer Chemotherapy,Drug, Chemotherapeutic Anticancer,Drugs, Antineoplastic,Drugs, Antitumor,Drugs, Cancer Chemotherapy
D014162	Transfection	The uptake of naked or purified DNA by CELLS, usually meaning the process as it occurs in eukaryotic cells. It is analogous to bacterial transformation (TRANSFORMATION, BACTERIAL) and both are routinely employed in GENE TRANSFER TECHNIQUES.	Transfections
D014407	Tumor Cells, Cultured	Cells grown in vitro from neoplastic tissue. If they can be established as a TUMOR CELL LINE, they can be propagated in cell culture indefinitely.	Cultured Tumor Cells,Neoplastic Cells, Cultured,Cultured Neoplastic Cells,Cell, Cultured Neoplastic,Cell, Cultured Tumor,Cells, Cultured Neoplastic,Cells, Cultured Tumor,Cultured Neoplastic Cell,Cultured Tumor Cell,Neoplastic Cell, Cultured,Tumor Cell, Cultured
D016373	DNA, Antisense	DNA that is complementary to the sense strand. (The sense strand has the same sequence as the mRNA transcript. The antisense strand is the template for mRNA synthesis.) Synthetic antisense DNAs are used to hybridize to complementary sequences in target RNAs or DNAs to effect the functioning of specific genes for investigative or therapeutic purposes.	Antisense DNA,Anti-Sense DNA,Anti Sense DNA,DNA, Anti-Sense
D016923	Cell Death	The termination of the cell's ability to carry out vital functions such as metabolism, growth, reproduction, responsiveness, and adaptability.	Death, Cell