Browsing by Author "Chang, C.-C."

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Direct and in vitro observation of growth hormone receptor molecules in A549 human lung epithelial cells by nanodiamond labeling
(2007-04-16)
Cheng, C.-Y.
;
Perevedentseva, E.
;
Tu, J.-S.
;
Chung, P.-H.
;
Cheng, C.-L.
This letter presents direct observation of growth hormone receptor in one single cancer cell using nanodiamond-growth hormone complex as a specific probe. The interaction of surface growth hormone receptor of A549 human lung epithelial cells with growth hormone was observed using nanodiamond's unique spectroscopic signal via confocal Raman mapping. The growth hormone molecules were covalent conjugated to 100 nm diameter carboxylated nanodiamonds, which can be recognized specifically by the growth hormone receptors of A549 cell. The Raman spectroscopic signal of diamond provides direct and in vitro observation of growth hormone receptors in physiology condition in a single cell level. (C) 2007 American Institute of Physics.
Mutation analysis of the tumor suppressor gene PPP2R1B in human cervical cancer
(2007-07-01)
Yeh, L.-S.
;
Hsieh, Y.-Y.
;
Chang, J.-G.
;
Chang, W. W.-C.
;
Chang, C.-C.
Protein phosphatase 2A (PP2A) holoenzyme plays a critical role in cell cycle control and growth factor signaling. The PPP2R1B gene encodes the beta isoforms of the subunit A of the PP2A. We aimed to evaluate the role of the PPP2R1B gene in the pathogenesis of cervical cancer. Twenty-four women with primary cervical cancer were included. All resected specimens were divided into two groups: (1) cervical cancers (n = 24), (2) nearby noncancerous tissues (n = 24). We performed nested reverse transcriptase-polymerase chain reaction analysis and complementary DNA sequencing on the genomic DNA samples of all specimens. The aberrant transcripts and gene mutation as well as the genotype and allele frequencies of codon 66 CTA/CTG of PPP2R1B genes in both groups were compared. The percentages of aberrant transcripts between both groups were nonsignificantly different (20.8% vs 33.3%). There was no mutation in all specimens. The genotype and allele frequencies between both groups were non-different. Proportions of CTA homozygote/heterozygote/CTG homozygote were (1) 66.7/8.3/25% and (2) 58.3/12.5/29.2%. Proportions of CTA/CTG alleles in both groups were (1) 70.8/29.2% and (2) 64.6/35.4%. We conclude that PPP2R1B genes may not play a role in the carcinogenesis of cervical cancer. Mutations of PPP2R1B gene are not frequent in cervical cancer.