1
|
Li DJ, Cheng YW, Pan JM, Guo ZC, Wang SH, Huang QF, Nie PJ, Shi WQ, Xu XE, Wen B, Zhong JL, Zhang ZD, Wu ZY, Zhao H, Liao LD, Wu JY, Zhang K, Dong G, Li EM, Xu LY. KAT8/SIRT7-mediated Fascin-K41 acetylation/deacetylation regulates tumor metastasis in esophageal squamous cell carcinoma. J Pathol 2024; 263:74-88. [PMID: 38411274 DOI: 10.1002/path.6261] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2023] [Revised: 11/25/2023] [Accepted: 01/08/2024] [Indexed: 02/28/2024]
Abstract
Fascin actin-bundling protein 1 (Fascin) is highly expressed in a variety of cancers, including esophageal squamous cell carcinoma (ESCC), working as an important oncogenic protein and promoting the migration and invasion of cancer cells by bundling F-actin to facilitate the formation of filopodia and invadopodia. However, it is not clear how exactly the function of Fascin is regulated by acetylation in cancer cells. Here, in ESCC cells, the histone acetyltransferase KAT8 catalyzed Fascin lysine 41 (K41) acetylation, to inhibit Fascin-mediated F-actin bundling and the formation of filopodia and invadopodia. Furthermore, NAD-dependent protein deacetylase sirtuin (SIRT) 7-mediated deacetylation of Fascin-K41 enhances the formation of filopodia and invadopodia, which promotes the migration and invasion of ESCC cells. Clinically, the analysis of cancer and adjacent tissue samples from patients with ESCC showed that Fascin-K41 acetylation was lower in the cancer tissue of patients with lymph node metastasis than in that of patients without lymph node metastasis, and low levels of Fascin-K41 acetylation were associated with a poorer prognosis in patients with ESCC. Importantly, K41 acetylation significantly blocked NP-G2-044, one of the Fascin inhibitors currently being clinically evaluated, suggesting that NP-G2-044 may be more suitable for patients with low levels of Fascin-K41 acetylation, but not suitable for patients with high levels of Fascin-K41 acetylation. © 2024 The Pathological Society of Great Britain and Ireland. Published by John Wiley & Sons, Ltd.
Collapse
Affiliation(s)
- Da-Jia Li
- The Key Laboratory of Molecular Biology for High Cancer Incidence Coastal Chaoshan Area, Department of Biochemistry and Molecular Biology, Shantou University Medical College, Shantou, PR China
| | - Yin-Wei Cheng
- The Key Laboratory of Molecular Biology for High Cancer Incidence Coastal Chaoshan Area, Department of Biochemistry and Molecular Biology, Shantou University Medical College, Shantou, PR China
- Cancer Research Center, Shantou University Medical College, Shantou, PR China
| | - Jin-Mei Pan
- Medical Informatics Research Center, Shantou University Medical College, Shantou, PR China
| | - Zhen-Chang Guo
- The Key Laboratory of Molecular Biology for High Cancer Incidence Coastal Chaoshan Area, Department of Biochemistry and Molecular Biology, Shantou University Medical College, Shantou, PR China
- Tianjin Key Laboratory of Medical Epigenetics, Department of Biochemistry and Molecular Biology, School of Basic Medical Sciences, Tianjin Medical University, Tianjin, PR China
| | - Shao-Hong Wang
- Clinical Research Center, Shantou Central Hospital, Shantou, PR China
| | - Qing-Feng Huang
- Guangdong Provincial Key Laboratory of Infectious Diseases and Molecular Immunopathology, Institute of Oncologic Pathology, Shantou University Medical College, Shantou, PR China
| | - Ping-Juan Nie
- The Key Laboratory of Molecular Biology for High Cancer Incidence Coastal Chaoshan Area, Department of Biochemistry and Molecular Biology, Shantou University Medical College, Shantou, PR China
| | - Wen-Qi Shi
- Clinical Research Center, Shantou Central Hospital, Shantou, PR China
| | - Xiu-E Xu
- The Key Laboratory of Molecular Biology for High Cancer Incidence Coastal Chaoshan Area, Department of Biochemistry and Molecular Biology, Shantou University Medical College, Shantou, PR China
- Guangdong Provincial Key Laboratory of Infectious Diseases and Molecular Immunopathology, Institute of Oncologic Pathology, Shantou University Medical College, Shantou, PR China
| | - Bing Wen
- The Key Laboratory of Molecular Biology for High Cancer Incidence Coastal Chaoshan Area, Department of Biochemistry and Molecular Biology, Shantou University Medical College, Shantou, PR China
| | - Jin-Ling Zhong
- The Key Laboratory of Molecular Biology for High Cancer Incidence Coastal Chaoshan Area, Department of Biochemistry and Molecular Biology, Shantou University Medical College, Shantou, PR China
| | - Zhi-Da Zhang
- The Key Laboratory of Molecular Biology for High Cancer Incidence Coastal Chaoshan Area, Department of Biochemistry and Molecular Biology, Shantou University Medical College, Shantou, PR China
| | - Zhi-Yong Wu
- Clinical Research Center, Shantou Central Hospital, Shantou, PR China
| | - Hui Zhao
- The Key Laboratory of Molecular Biology for High Cancer Incidence Coastal Chaoshan Area, Department of Biochemistry and Molecular Biology, Shantou University Medical College, Shantou, PR China
- Cancer Research Center, Shantou University Medical College, Shantou, PR China
| | - Lian-Di Liao
- The Key Laboratory of Molecular Biology for High Cancer Incidence Coastal Chaoshan Area, Department of Biochemistry and Molecular Biology, Shantou University Medical College, Shantou, PR China
- Guangdong Provincial Key Laboratory of Infectious Diseases and Molecular Immunopathology, Institute of Oncologic Pathology, Shantou University Medical College, Shantou, PR China
| | - Jian-Yi Wu
- The Key Laboratory of Molecular Biology for High Cancer Incidence Coastal Chaoshan Area, Department of Biochemistry and Molecular Biology, Shantou University Medical College, Shantou, PR China
| | - Kai Zhang
- Tianjin Key Laboratory of Medical Epigenetics, Department of Biochemistry and Molecular Biology, School of Basic Medical Sciences, Tianjin Medical University, Tianjin, PR China
| | - Geng Dong
- Medical Informatics Research Center, Shantou University Medical College, Shantou, PR China
| | - En-Min Li
- The Key Laboratory of Molecular Biology for High Cancer Incidence Coastal Chaoshan Area, Department of Biochemistry and Molecular Biology, Shantou University Medical College, Shantou, PR China
- Shantou Academy Medical Sciences, Shantou, PR China
| | - Li-Yan Xu
- The Key Laboratory of Molecular Biology for High Cancer Incidence Coastal Chaoshan Area, Department of Biochemistry and Molecular Biology, Shantou University Medical College, Shantou, PR China
- Cancer Research Center, Shantou University Medical College, Shantou, PR China
- Guangdong Provincial Key Laboratory of Infectious Diseases and Molecular Immunopathology, Institute of Oncologic Pathology, Shantou University Medical College, Shantou, PR China
| |
Collapse
|
2
|
Tang WY, Tong Q, Li BM, Zheng WC, Pan JM, Wang XC, Liu X, Jin K. Effects of different light-emitting diode light on hatch performance, embryo development, eye structure, and plasma melatonin in layer incubation. Poult Sci 2023; 102:102977. [PMID: 37562131 PMCID: PMC10432833 DOI: 10.1016/j.psj.2023.102977] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2023] [Revised: 07/23/2023] [Accepted: 07/24/2023] [Indexed: 08/12/2023] Open
Abstract
Light intensity, wavelength, and photoperiod have a combined effect on chicken incubation. This study was conducted to evaluate the effect of 12-h light, 12-h dark (12L:12D) photoperiod of white light (380-780 nm, WL), blue light (455/447.5-462.5 nm, BL), and green light (525/515-535 nm, GL) in chicken perceived light intensity during layer incubation on hatching performance, embryo development, eye structure, and melatonin concentration. Three batches of eggs from Jinghong No. 1 layer breeder were used in this experiment. Light stimulation had no effect on hatchability, and no consistent effect on embryo weight and newly hatched chick weight. However, the average hatching time of white light group and green light group was 7.3 h and 5.5 h later than that of the control group. Therefore, the holding period of chicks was significantly shortened (P = 0.001) in these 2 light groups. Light stimulation had a significant effect on the thickness of retinal layers (P < 0.05), retinal layers of white light group was thicker than that of the other 3 groups. Melatonin levels of chicks hatched in the green light and blue light were significantly higher than that of chicks hatched in the white light and darkness (P < 0.05). It indicated that the monochrome green and blue light promoted the expression of melatonin in chicken embryos. No significant diurnal rhythms were found at the level of plasma melatonin in 4 groups on d 21 using cosine analysis. It was concluded that green light has a positive effect on embryo development and melatonin secretion, while white light probably has positive effect on eye development. Furthermore, both green and white light stimulation resulted in late hatch for layer egg incubation. The obtained results are important in determining the light protocol for chicken incubation.
Collapse
Affiliation(s)
- W Y Tang
- Department of Agricultural Structure and Environmental Engineering, College of Water Resources and Civil Engineering, China Agricultural University, Beijing 100083, China
| | - Q Tong
- Department of Agricultural Structure and Environmental Engineering, College of Water Resources and Civil Engineering, China Agricultural University, Beijing 100083, China; Key Laboratory of Agricultural Engineering in Structure and Environment Ministry of Agriculture and Rural Affairs, Beijing 100083, China; Beijing Engineering Research Center on Animal Healthy Environment, Beijing 100083, China.
| | - B M Li
- Department of Agricultural Structure and Environmental Engineering, College of Water Resources and Civil Engineering, China Agricultural University, Beijing 100083, China; Key Laboratory of Agricultural Engineering in Structure and Environment Ministry of Agriculture and Rural Affairs, Beijing 100083, China; Beijing Engineering Research Center on Animal Healthy Environment, Beijing 100083, China
| | - W C Zheng
- Department of Agricultural Structure and Environmental Engineering, College of Water Resources and Civil Engineering, China Agricultural University, Beijing 100083, China; Key Laboratory of Agricultural Engineering in Structure and Environment Ministry of Agriculture and Rural Affairs, Beijing 100083, China; Beijing Engineering Research Center on Animal Healthy Environment, Beijing 100083, China
| | - J M Pan
- Department of Biosystems Engineering, Zhejiang University, Hangzhou 310058, China
| | - X C Wang
- Department of Agricultural Structure and Environmental Engineering, College of Water Resources and Civil Engineering, China Agricultural University, Beijing 100083, China
| | - X Liu
- Department of Agricultural Structure and Environmental Engineering, College of Water Resources and Civil Engineering, China Agricultural University, Beijing 100083, China
| | - K Jin
- Department of Agricultural Structure and Environmental Engineering, College of Water Resources and Civil Engineering, China Agricultural University, Beijing 100083, China
| |
Collapse
|
3
|
Shi HP, Wang ZQ, Fan ZY, Zang MD, Pan JM, Dai QQ, Zheng YN, Zhu ZL, Sah RD, Liu WT, Yang ZY, Feng RH, Yao XX, Chen MM, Yan C, Yan M, Zhu ZG, Li C. [Analysis and comparison of the clinical features and prognosis between extra - gastrointestinal stromal tumors and duodenal gastrointestinal stromal tumors]. Zhonghua Wei Chang Wai Ke Za Zhi 2019; 22:856-860. [PMID: 31550825 DOI: 10.3760/cma.j.issn.1671-0274.2019.09.010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Objective: To investigate the differences of clinicopathological features, diagnosis, treatment and prognosis between patients with extra-gastrointestinal stromal tumors (EGIST) and duodenal gastrointestinal stromal tumors (DGIST). Methods: A retrospective case - control study was performed. Case inclusion criteria: (1) tumor confirmed by histology and pathology; (2) primary tumor locating in the extra - gastrointestinal tract or duodenum; (3) without other synchronous tumors; (4) complete clinical and pathological data. Clinical data of 20 EGIST patients and 32 DGIST patients from March 2011 to September 2016 at Department of Gastrointestinal Surgery, Ruijin Hospital, Shanghai Jiaotong University School of Medicine were retrospectively collected and analyzed. The observational parameters included clinicopathological characteristics, treatment and prognosis conditions. Continuous data of abnormal distribution were expressed as median (range) and compared using the Mann-Whitney U-test. Survival curves were drawn by the Kaplan-Meier method and compared with the Log-rank test. Results: Of the 20 EGIST patients, 8 were males and 12 were females with age of 61.0 (30.0 to 86.0) years and of the 32 DGIST patients, 12 were males and 20 were females with age of 55.5 (27.0 to 70.0) years. Compared with DGIST patients, EGIST patients were older (U=188.000, P=0.012], had larger tumor size [10.0 (3.0 to 29.0) cm vs. 4.0 (1.5 to 10.0) cm, U=98.500, P<0.001] and higher ratio of high risk classification [85.0% (17/20) vs. 12.5% (4/32), χ(2)=26.870, P<0.001]. Among the 20 EGIST patients, 5 were diagnosed with distal metastasis and received imatinib (400 mg/d), and the other 15 patients underwent radical resection who were included in survival analysis. All the 32 DGIST patients underwent radical resection. The median follow-up of whole group was 43 (14 to 76) months. The 3-year recurrence/metastasis-free survival rate of 15 cases undergoing radical resection in the EGIST group was 85.6%, which was lower than that of the DGIST group (88.6%), and the difference was not statistically significant (P=0.745). There was no significant difference in the 3-year overall survival rate between the EGIST group (92.9%) and the DGIST group (100%) (P=0.271). Conclusions: As compared to DGIST, EGIST mostly occurs in those with older age, larger tumor size and higher risk grade. The prognosis of EGIST patients after radical resection is similar to that of DGIST patients.
Collapse
Affiliation(s)
- H P Shi
- Department of Gastrointestinal Surgery, Shanghai Key Laboratory of Gastric Neoplasms, Shanghai Institute of Digestive Surgery, Ruijin Hospital, Shanghai Jiaotong University School of Medicine, Shanghai 200025, China
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
4
|
Yang YF, Jin SF, Zhong ZT, Yu YH, Yang B, Yuan HB, Pan JM. Growth responses of broiler chickens to different periods of artificial light. J Anim Sci 2016; 93:767-75. [PMID: 26020757 DOI: 10.2527/jas.2014-8096] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
This study aimed to establish response curves between broiler chicken growth parameters and artificial light periods, as opposed to optimizing a lighting regimen for broiler production. Medium-growing broiler chickens were illuminated for periods of 12, 14, 16, 18, 20, 22, or 24 h each day. The BW of the broilers were significantly influenced by light periods ( < 0.05). Moreover, BW responded to light periods in a linear fashion, suggesting that long light periods result in greater BW. In addition, a linear relationship was found between feed intake and light periods. However, the relationship between shank length and light period was quadratic. When the light period was too short (12 h) or too long (24 h), the light stimulus did not enhance shank growth in the broiler chickens ( < 0.05). In addition, a quadratic relationship between the quantity of abdominal adipose tissue and light period suggested that the quantity of abdominal adipose decreases when the period of the light stimulus was too short or too long ( < 0.05). Moreover, a broken-stick analysis suggested that the triiodothyronine (T3) concentration in the blood was minimally affected beyond 18 h ( = 0.267), although a quadratic relationship was found between the period (from 18 to 24 h) and T3 concentrations in the blood. The response curves established in the present study will be valuable for designing future lighting regimes for medium-growing broiler strains.
Collapse
|
5
|
Abstract
Maltose-binding protein (MBP) encoded by malE is essential for the energy-dependent translocation of maltose through the cytoplasmic membrane of bacteria. Its property of specific binding to maltose has been used in constructing fusion proteins for easy affinity purification. A monoclonal antibody named MAb SC1D7 was produced against Escherichia coli MBP. This MAb also bound to MBP-containing recombinant proteins in both Western blotting and immunoprecipitation analysis. As a result, this MAb can be a useful probe for tracing MBP-fusion proteins in various applications. Furthermore, intrinsic MBPs from E. coli, Shigella dysenteriae, Salmonella typhimurium, Enterobacter cloacae, and Klebsiella pneumoniae were also detected by this MAb. No reaction was observed with the total proteins from Serratia marcescens, Aeromonas hydrophila and Plesiomonas shigelloides. These observations suggest that the MAb SC1D7-defined epitope is conserved among some enteric bacteria, but not the others. The results strengthen the phylogenetic positions of these closely related bacteria previously placed by other means.
Collapse
Affiliation(s)
- S C Hsu
- Institute of Bio-Pharmaceutical Science, National Yang-Ming University, Pai-Tou, Taipei, Taiwan, ROC
| | | | | | | |
Collapse
|
6
|
Abstract
Cytochrome P450IIE1 (P450IIE1) is responsible for the metabolic activation of N-nitrosodimethylamine (NDMA), a potent environmental carcinogen. This P450 enzyme displays a high-affinity NDMA demethylase (NDMAd) activity and is known to be induced by fasting and acetone administration. In the present work, the effects of pituitary hormones on the regulation of P450IIE1 in the liver were investigated and compared in rats and mice. There was no difference in liver microsomal NDMAd activity (nmol/min/mg protein) in rats in the intact (0.38 +/- 0.12), sham-operated (0.44 +/- 0.06), and hypophysectomized (0.52 +/- 0.04) groups. However, hypophysectomy caused a 2-fold increase in hepatic P450IIE1 protein levels as determined by immunoblot analysis. The P450IIE1 mRNA level in hypophysectomized rat was also significantly increased. The levels of blood ketone bodies (acetone, acetoacetate, and beta-hydroxybutyrate) were not different in the intact, sham-operated, and hypophysectomized groups, suggesting that ketone bodies are not involved in the induction of P450IIE1 protein and its mRNA by hypophysectomy. The discrepancy between the NDMAd activity and the increased P450IIE1 protein in rat liver by hypophysectomy can be partially explained by the lower hepatic NADPH-P450 reductase activity (50% that of the control) in the hypophysectomized rats. Upon the induction of liver NDMAd activity by fasting and acetone, hypophysectomy attenuated the effect of acetone but abolished the effect of fasting completely. Nevertheless, fasting still caused a 3-fold increase in the liver P450IIE1 mRNA level. An involvement of pituitary hormones in the regulation of liver microsomal P450IIE1 in mouse, however, was not observed. There was no difference in constitutive NDMAd activity between genetically growth hormone-deficient (lit/lit) mice and their phenotypically normal heterozygotes (lit/+). Fasting for 48 h caused 1.5- to 2-fold induction and acetone caused 2- to 3-fold induction, in both groups. The above changes in enzyme activity were due to the changes of P450IIE1 levels as verified by the immunoblot analysis. In male BALB/c mice, neither the hepatic NDMAd activity nor the P450IIE1 protein level was altered by hypophysectomy. The effects of acetone on the liver NDMAd activity were also similar in hypophysectomized and sham-operated mice. The results suggest that pituitary hormones are important in the regulation of the expression and activity of hepatic P450IIE1 in rats but not in the mouse strains investigated.
Collapse
Affiliation(s)
- J Y Hong
- Department of Chemical Biology and Pharmacognosy, College of Pharmacy, Rutgers University, Piscataway, New Jersey 08855-0789
| | | | | | | | | | | |
Collapse
|
7
|
Hong JY, Pan JM, Ning SM, Yang CS. Molecular basis for the sex-related difference in renal N-nitrosodimethylamine demethylase in C3H/HeJ mice. Cancer Res 1989; 49:2973-9. [PMID: 2720658] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Previous work with rat and rabbit liver enzymes has demonstrated that cytochrome P450IIE1 is responsible for the metabolism of N-nitrosodimethylamine (NDMA), a widely occurring carcinogen. The present study demonstrated that a similar enzyme also exists in the mouse kidney and is regulated by testosterone. These results can account for the reported sex-related difference in the renal metabolism of NDMA in mouse strains such as C3H/HeJ. NDMA demethylase activities (expressed as pmol/min/mg protein) in kidney microsomes of female and male C3H/HeJ mice were 3.0 +/- 0.7 and 51.9 +/- 11.2, respectively. After testosterone treatment (500 mg/kg b.w. in olive oil, s.c.) for 2 days, the renal NDMA demethylase activity of the female mice was elevated 17-fold. The difference and change in NDMA demethylase activity were accompanied by corresponding differences and changes in P450IIE1 as quantified by immunoblot analysis (using antibodies prepared against rat P450IIE1) as well as in the mRNA level for P450IIE1 as determined by Northern and slot blot analyses (using a cDNA probe containing the coding sequence of rat P450IIE1 gene). Based on gel electrophoresis, the molecular weight of mouse renal P450IIE1 was 52,000 and the size of mouse renal P450IIE1 mRNA was approximately 1.8 kilobases; both were similar to those found in rat liver and kidney. Renal P450IIE1 mRNA levels in female, male, and testosterone-treated female mice were at a ratio of 1:22:20. On the other hand, this testosterone-related difference was not observed in hepatic P450IIE1. In liver microsomes, there were no significant differences in NDMA demethylase activity, P450IIE1 content, and P450IIE1 mRNA level between male and female mice or between untreated and testosterone-treated female mice. The apparent Km value of NDMA demethylase in mouse kidney microsomes (22 to 27 microM NDMA) were similar to that in rat liver microsomes. Renal NDMA demethylase activity was inhibited by a monoclonal antibody prepared against rat P450IIE1. These results suggest that mouse renal P450IIE1 is similar to rat P450IIE1 and is responsible for the low Km form of NDMA demethylase activity. Nevertheless, only the mouse renal enzyme is regulated by testosterone.
Collapse
Affiliation(s)
- J Y Hong
- Department of Chemical Biology and Pharmacognosy, College of Pharmacy, Rutgers University, Piscataway, New Jersey 08855-0789
| | | | | | | |
Collapse
|
8
|
Hong JY, Pan JM, Dong ZG, Ning SM, Yang CS. Regulation of N-nitrosodimethylamine demethylase in rat liver and kidney. Cancer Res 1987; 47:5948-53. [PMID: 3664497] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
In previous work, the low Km form of N-nitrosodimethylamine (NDMA) demethylase has been demonstrated to be due to a specific form of cytochrome P-450 (designated as P-450ac) and to be the enzyme required for the metabolic activation of NDMA. The present work deals with the regulation of P-450ac in rat liver during development as well as the mechanism of induction of P-450ac in rat liver and kidney by inducers. NDMA demethylase activity was almost undetectable in the liver of newborn rats, increased after day 4, and remained elevated throughout the first 17 days of the neonatal period. The enhancement of NDMA demethylase activity during development was accompanied by corresponding increases of P-450ac content and P-450ac mRNA levels as determined by Western and slot blot analyses, respectively. No sex differences with respect to this enzyme were observed in the developing rats. Acetone treatment on late-term pregnant rats for 2 days resulted in transplacental inductions of P-450ac and P-450ac mRNA in the newborn rats. Pretreatment of young male rats and adult female rats with acetone or isopropyl alcohol caused increases of NDMA demethylase activity and P-450ac content in the liver but no significant change in the P-450ac mRNA level. These facts suggest the possible existence of a posttranscription regulatory mechanism under these induction conditions. The presence of P-450ac in rat kidney was demonstrated by Western and Northern blot analyses. The renal form of P-450ac seemed to be regulated in a fashion similar to the hepatic P-450ac regarding its response to inducing factors such as fasting and acetone treatment.
Collapse
Affiliation(s)
- J Y Hong
- Department of Biochemistry, UMDNJ-New Jersey Medical School, Newark 07103-2757
| | | | | | | | | |
Collapse
|
9
|
Abstract
In previous work we have demonstrated that liver microsomal N-nitrosodimethylamine demethylase (NDMAd) activity is increased in rats by fasting, and we have postulated that this is due to the induction of a specific form of cytochrome P-450. This communication provides evidence for such a hypothesis. Fasting for 24 and 48 h caused 59 and 116% increases, respectively, in NDMAd activity in male rats, and fasting for 48 h caused a 63% increase in female rats. These increases were accompanied by corresponding increases of cytochrome P-450j (P-450ac) determined by immunoblotting. Fasting for 24 and 48 h also increased the mRNA for P-450j by 153 to 250%, as determined by hybridization with a cDNA probe of this cytochrome. The results suggest that fasting affects the gene expression of P-450j.
Collapse
|