Ignite Creation Date:
2024-05-05 @ 11:56 AM
Last Modification Date:
2024-10-26 @ 9:16 AM
Study NCT ID:
NCT00174109
Status:
UNKNOWN
Last Update Posted:
2005-09-15
First Post:
2005-09-13
Brief Title:
The Relation of Microtubule-Associated Protein 2 and Cell Migration
Sponsor:
National Taiwan University Hospital
Organization:
National Taiwan University Hospital
Study Overview
Official Title:
None
Status:
UNKNOWN
Status Verified Date:
2005-06
Last Known Status:
RECRUITING
Delayed Posting:
No
If Stopped, Why?:
Not Stopped
Has Expanded Access:
False
If Expanded Access, NCT#:
N/A
Has Expanded Access, NCT# Status:
N/A
Acronym:
None
Brief Summary:
Clarify the relation of microtubule-associated protein 2 and cell migration
Detailed Description:
Betel quid chewing has been shown to have intimate correlation with oral cancer In Taiwan the incidence of oral cancer is the fourth most common malignancy in male and in fact 90 of which has been linked to betel quid chewing The predisposing factors in oral cancers between the western countries and India Southeast Asia including Taiwan are different The factor is smoking in the former countries and betel quid chewing is the most important one in the latter groups The genetic aberrations of oral cancers are different too between the western countries and India Southeast Asia including Taiwan The percentage of RAS mutations of oral cancers in the western countries is around 5 and 35 in the India In Taiwan the RAS mutation rate revealed with immunohistochemical staining is 92 comparing with those in western countries 62 Japan 55-65 and vice versa in the p53 mutations The percentage of p53 mutations of oral cancers in the western countries is around 50 and 16 in the India Southeast Asia and Taiwan It is generally believed that betel nut itself arecoline and arecaidine the major betel alkaloids account for the etiological factors in the pathogenesis of oral cancer while betel quid supplements unlike the former two main components were reported to have little relevancy to oral cancer Despite the fact that the cytotoxic and genotoxic effects of betel nut extract and arecoline arecaidine have been extensively documented and that some well-studied oncogenes or tumor suppressor genes have been implicated in betel quid-related oral cancer the molecular mechanisms addressed in a broader view by which betel nut ingredients lead to oral tumorigenesis are not fully understood Our preliminary results by virtue of different genome-wide screening approaches to explore cellular functions of protein kinases in this context identified several candidates that showed differential expression upon treatment of BQ on primary cultures from human oral mucosa Of the candidates isolated microtubule-associated protein 2 MAP2 a neuron-specific cytoskeletal protein that is thought to predominantly express in rat brain cells was found up-regulated at RNA level by RT-PCR in primary cultures Our expanded immunohistochemical results of normal mucosa leukoplakia and oral squamous cell carcinoma OSCC suggest that expression of the MAP2 significantly correlates with progression of BQ-induced OSCC P 00046 since the percentage of MAP2 positive staining is as much fourfold in BQ-exposed OSCC 412 as in BQ-free OSCC 105 whereas normal mucosa and leukoplakia show much less immunoreactivity as a whole Furthermore the MAP2 is shown to be preferentially expressed in histopathologically less differentiated OSCC P 0014 Finally we show that the MAP2 is highly expressed in the majority of invasive OSCC 67 Consequently this finding in conjunction with the previous one raise a possibility that overexpression of the MAP2 may play a critical role in the development of highly malignant OSCC characteristic of invasive andor metastatic Here we study the issue by establishing an in vitro system where extracts from the whole betel quid sandwiches are used to treat head and neck cancer cell lines and primary oral epithelial cells and subsequently the effects of such treatments will be evaluated in terms of cell migration Western blotting Eight head and neck cancer cell lines and normal oral mucosae from 8 patients undergoing oral surgery will be collected Extracts from the whole betel quid sandwiches with the concentration of 15 mgml will be added to the cell lines and primary oral epithelial cells for 13 and 5 days respectively Migration assay and detection of MAP2 expression will be performed to elucidate the relationship of MAP2 and cell migration
Study Oversight
Has Oversight DMC:
None
Is a FDA Regulated Drug?:
None
Is a FDA Regulated Device?:
None
Is an Unapproved Device?:
None
Is a PPSD?:
None
Is a US Export?:
None
Is an FDA AA801 Violation?:
None