To investigate the effects of selective cyclooxygenase-2 (COX-2) inhibitor NS-398 on 5-fluorouracil (5-Fu) chemotherapy and on the progression of colon cells.

To determine the effects of Varglaucocalyx on c-fos gene expression during global myocardial ischemia-reperfusion.

To investigate the role of major histocompatibility complex (MHC) II transactivator in constitutive or interferon (IFN)-gamma inducible expression of MHC molecules in human malignant hematological cell lines.

To explore the molecular mechanism of neural tube defects (NTDs) caused by hyperglycemia and thiadiazole and the antagonistic effect of taurine.

To explore the effects of Triptolide (TP) on TNFalpha-induced cell proliferation and expressions of cyclooxygenase-2 (COX-2), inducible nitric oxide synthase (iNOS) and their inducing products PGE2, NO in human rheumatoid arthritis synovial fibroblasts (RASF).

To investigate the effect of bacillus Calmette-Guerin (BCG) on Toll-like receptors (TLRs) expression and cytokine production in human bladder cancer cell line T24.

Rat's osteoblasts cultured in vitro were stimulated by recombinant bovine basic fibroblast growth factor(rb-bFGF). After 1-2 days, the osteoblast grew long protuberance, the numbers of osteoblasts were greater than the control groups', the vitality of osteoblasts was better than that of control groups. After 1 hour, the expression of c-fos in osteoblast increased when compared with that in the control group. After the osteoblasts having been stimulated for 1-2 days, the expression of c-fos increased more conspicuously. These results show that bFGF can boost the osteoblast to grow and proliferate and can enhance the expression of c-fos gene. The increase of c-fos gene's expression may be an important step in the signal transformation process of all kinds of stimulation boosting osteoblast to proliferate.

AIM To establish a drug screening model based on transcriptional regulation of estrogen responsive element (ERE) and use it to screen compounds for discovering new ligands of estrogen receptor (ER) subtypes.

To investigate the effect of hydrogen peroxide (H(2)O(2)) on interleukin-1beta (IL-1beta)-induced cyclooxygenase-2 (COX-2) expression in human pulmonary epithelial cells (HPEC).

To observe the effects of Panax Notoginosides (PNS) on up-regulation of AP-1 family transcription factors NF-E2, c-jun and c-fos for exploring intracellular signal pathway of PNS in hematopoietic cells, four human hematopoietic cells lines including myeloid HL-60, erythroid K562, megakaryoid CHRF-288 and Meg-01 were incubated in the presence of PNS for 14 days. The nuclear protein of cells were extracted and analyzed by Western blot with antibodies against NF-E2, c-fos and c-jun. Electrophoretic mobility shift assay (EMSA) was performed by using (32)P labeled AP-1 consensus oligonucleotide which contains binding site for NF-E2, c-jun and c-fos. The results showed that the transcription factors NF-E2, c-jun and c-fos of AP-1 family could be induced by PNS. Western blot demonstrated that the nuclear protein of both NF-E2 and c-jun in four cell lines treated by PNS were increased by 1.5-2.5- and 2.0-3.0-fold over untreated cells respectively. The c-fos protein in three cell lines of K562, CHRF-288 and Meg-01 was also elevated by 2.0-3.0-fold respectively, while c-fos protein in HL-60 cells was no detectable difference after PNS treatment. EMSA results in four cell lines indicated that AP-1 binding activity initiated by PNS was apparently elevated to form higher density band of AP-1-DNA complex. In conclusion, the intracellular transcription regulation initiated by PNS was involved in transcription factors NF-E2, c-jun and c-fos of AP-1 family members, which could play an important role in the up-regulation of genes expression related to proliferation and differentiation of hematopoietic cells.

To investigate the inhibiting effect of classII major histocompatibility complex transactivator (CIITA) anti-sense cDNA on MHCII molecules expression.

To study the expression and localization of early growth response gene-1 (Egr-1) in macrophages after stimulation by silicon dioxide in vivo and in vitro and to discuss the role of Egr-1 in the development of silicosis.

To observe the effect of lead on the expression of c-fos mRNA in hippocampus and cerebellum and the ability of learning and memory in rat, and to observe the antagonistic action of Gastrodia elata and E-gelatin on the effect mentioned above.

To study the mechanism of gene JWA involved in oxidative stress under hydrogen peroxide (H(2)O(2)) exposure.

To investigate the gene expression of transforming growth factor-beta(1) (TGF-beta(1)) in lung tissues of silica-treated mice.

To explore the toxic mechanism of 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) by studying the induction of cytochrome P4501A1 (CYP1A1) and aryl hydrocarbon receptor (AHR) mRNA in liver of TCDD-treated SD rats.

To understand the differentially expressed genes in human T lymphocytes induced by arsenic trioxide (As(2)O(3)) and to explore mechanism of its immunotoxicity and immune suppression.