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Wang K, Zhu QZ, Ma XT, Cheng C. SUV39H2/KMT1B Inhibits the cardiomyocyte senescence phenotype by down-regulating BTG2/PC3. Aging (Albany NY) 2021; 13:22444-22458. [PMID: 34559682 PMCID: PMC8507256 DOI: 10.18632/aging.203551] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [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: 11/03/2020] [Accepted: 08/24/2021] [Indexed: 04/08/2023]
Abstract
Suppressor of variegation 3-9 homolog 2 (SUV39H2/KMT1B), a member of the SUV39 subfamily of lysine methyltransferases (KMTs), functions as an oncogene in various types of cancers. Here, we demonstrate a novel function of SUV39H2 that drives the cardiomyocyte aging process through BTG2. In our study, cardiomyocyte aging was induced by H2O2 and aging cells exhibited increases in SUV39H2. Knockdown of SUV39H2 accelerated cardiomyocyte senescence, while overexpression of SUV39H2 inhibited the cardiomyocyte senescence phenotype. These effects of SUV39H2 on cardiomyocytes were independent of DNA damage and mitochondrial dysfunction. Interestingly, RNA sequencing and bioinformatics analyses identified a strong correlation between SUV39H2 and BTG2. In addition to this, BTG2 protein levels were significantly increased in SUV39H2-deficient cardiomyocytes, and BTG2 knockdown virtually rescued the cardiomyocyte senescence phenotype induced by SUV39H2 knockdown. Taken together, these results indicate that SUV39H2 protects cardiomyocytes from H2O2 exposure-induced oxidative stress, DNA damage, and mitochondrial dysfunction by regulating the p53-BTG2 pathway. Our findings provide evidence that the activation of SUV39H2 has therapeutic or preventive potential against cardiac aging.
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Affiliation(s)
- Kan Wang
- Division of Cardiothoracic and Vascular Surgery, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei 430030, China
- Department of Cardiovascular Surgery, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei 430022, China
| | - Qiang Zhang Zhu
- Division of Cardiothoracic and Vascular Surgery, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei 430030, China
| | - Xian Tao Ma
- Division of Cardiothoracic and Vascular Surgery, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei 430030, China
| | - Cai Cheng
- Division of Cardiothoracic and Vascular Surgery, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei 430030, China
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Chen XL, Li DH, Zhu QZ, Yang HH, Zheng H, Wang ZH, Xu JG. Determination of proteins at nanogram levels by a resonance light-scattering technique with tetra-substituted sulphonated aluminum phthalocyanine. Talanta 2012; 53:1205-10. [PMID: 18968214 DOI: 10.1016/s0039-9140(00)00611-1] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2000] [Revised: 10/03/2000] [Accepted: 10/04/2000] [Indexed: 11/27/2022]
Abstract
This is the first report on the determination of proteins with tetra-substituted sulphonated aluminum phthalocyanine (AlS(4)Pc) by resonance light-scattering (RLS). At pH 3.0, the weak RLS of AlS(4)Pc can be enhanced by the addition of proteins. Based on this, a novel quantitative method has been developed for the determination of proteins in aqueous solutions. Under optimal conditions, the linear ranges of the calibration curves were 0.050-2.0 mug ml(-1) for both human serum albumin (HSA) and human r-IgG. The detection limits were 12.7 ng ml(-1) for HSA and 16.1 ng ml(-1) for human r-IgG. The method has been applied to the analysis of total protein in human serum samples collected from the hospital and the results were in good agreement with those reported by the hospital, which indicates that the method presented here is not only sensitive, simple, but also reliable and suitable for practical applications.
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Affiliation(s)
- X L Chen
- The Key Laboratory of Analytical Science of MOE, Department of Chemistry, Xiamen University, Xiamen 361005, People's Republic of China
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Yang HH, Zhu QZ, Chen S, Li DH, Chen XL, Ding M, Xu JG. Fluorescence immunoassay system based on the use of a pH-sensitive phase-separating polymer. Anal Biochem 2001; 296:167-73. [PMID: 11554711 DOI: 10.1006/abio.2001.5184] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Poly(N-isopropylacrylamide-co-methacrylic acid) [P(NIPAAm-co-MAA)], a linear water-soluble pH-sensitive phase-separating polymer, was synthesized and used as a novel separation carrier for the reactants in immunoassay. This polymer precipitates out of water below a critical pH 5.8 at 37 degrees C and redissolves when the pH of solution is above 6.2. The characteristic of this polymer makes it possible to carry out the immunochemical steps of an immunoassay in a true solution and then to quickly separate the resulting product from the reaction mixture. The above approach was applied to determination of alpha-fetoprotein with the competitive immunoassay format. Compared with traditional ELISA using the same reactants, the proposed method was much faster (the assay time decreased from 100-120 to 30 min) and showed similar sensitivity, i.e., 0.04 ng/mL. In addition, a sandwich immunoassay method for the determination of hepatitis B surface antigen was also studied, and the results showed that the pH phase-separating immunoassay could be carried out through a sandwich or a competitive method. This general technique may also be used for a wide variety of separation processes in addition to immunoassay, in which a specific component is to be isolated for analysis, recovery, or disposal.
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Affiliation(s)
- H H Yang
- Key Laboratory of Analytical Science of MOE, Xiamen University, Xiamen, 361005, People's Republic of China
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Yang HH, Zhu QZ, Li DH, Lin P, Ding MT, Xu JG. Fluorescence immunoassay of alpha-fetoprotein with iron(III) tetrasulfonatophthalocyanine as a mimetic enzyme labeling reagent. Fresenius J Anal Chem 2001; 370:88-91. [PMID: 11393243 DOI: 10.1007/s002160100723] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
A new fluorimetric immunoassay for alpha-fetoprotein (AFP) has been developed using a novel promising mimetic peroxidase, iron(III) tetrasulfonatophthalocyanine (FeTSPc), as a labeling reagent to catalyze the fluorescence reaction of P- hydroxyphenylacetic acid (P-HPA) and hydrogen peroxide (H2O2). In the competitive immunoassay, anti-AFP antibody was coated on a 96-well plate (polystyrene) and a constant amount of FeTSPc-labeled AFP and a known amount of test solution were added. Non-labeled and FeTSPc-labeled AFP compete for binding to the plate-bound antibody. After the immunoreaction, the immunochemically adsorbed FeTSPc-AFP conjugate moiety was determined by measuring the fluorescence produced in a solution containing P-HPA and H2O2. AFP can be determined in the concentration range of 1-300 ng mL(-1) with a detection limit of 0.5 ng mL(-1).
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Affiliation(s)
- H H Yang
- Department of Chemistry, Xiamen University, P.R. China
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Chen XL, Li DH, Yang HH, Zhu QZ, Zheng H, Xu JG. A new red-region substrate, tetra-substituted amino aluminium phthalocyanine, for the fluorimetric determination of H2O2 catalyzed by mimetic peroxidases. Analyst 2001; 126:523-7. [PMID: 11340992 DOI: 10.1039/b009253n] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A new red-region fluorogenic substrate, tetra-substituted amino aluminium pthalocyanine, was developed for the selective determination of H2O2 based on the catalytic effect of mimetic peroxidases, viz., hemin or iron tetrasulfonatophthalocyanine (FeTSPc). Under the optimum conditions, the linearity of the calibration graph for the determination of H2O2 with hemin (or FeTSPc) as the catalyst was in the range from 0.0 to 3.0 x 10(-7) mol L-1 (or from 0.0 to 2.0 x 10(-6) mol L-1). The detection limits were 3.7 x 10(-9) and 4.9 x 10(-9) mol L-1 H2O2, respectively. The relative standard deviation (n = 7) was within 1.5% in the middle of the linear range. The peroxidase activity of the mimetic enzymes hemin and FeTSPc, the effects of some experimental conditions and the influence of foreign substances were investigated. With this substrate, 0.0-7.5 x 10(-8) mol L-1 hemin and 0.0-2.0 x 10(-6) mol L-1 FeTSPc can be determined with an accuracy and precision of about 1.3%. The potential application of the reagent was tested by the determination of H2O2 in rainwater.
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Affiliation(s)
- X L Chen
- Key Laboratory of Analytical Sciences of MOE, Department of Chemistry, Xiamen University, Xiamen 361005, China
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Zhan XQ, Li DH, Zhu QZ, Zheng H, Xu JG. Sensitive fluorimetric determination of formaldehyde by the co-quenching effect of formaldehyde and sulfite on the fluorescence of tetra-substituted amino aluminium phthalocyanine. Analyst 2000; 125:2330-4. [PMID: 11219077 DOI: 10.1039/b005432l] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A novel and sensitive fluorimetric method was developed for the determination of formaldehyde based on the co-quenching effect of formaldehyde and sulfite on the fluorescence of tetra-substituted amino aluminium phthalocyanine. Formaldehyde in the concentration range 0.040-1.19 micrograms ml-1 can be determined with a limit of detection of 7.5 ng ml-1. The relative standard deviation for nine replicate measurements of 80.0 ng ml-1 formaldehyde is 1.8%. The method was applied to the analysis of real samples with satisfactory results.
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Affiliation(s)
- X Q Zhan
- Department of Chemistry, Zhangzhou Teachers' College, Zhangzhou 363000, China
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Zhu QZ, Yang HH, Li DH, Chen QY, Xu JG. A novel mimetic enzymatic fluorescence immunoassay for hepatitis B surface antigen by using a thermal phase separating polymer. Analyst 2000; 125:2260-3. [PMID: 11219063 DOI: 10.1039/b005748g] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Iron tetrasulfonatophthalocyanine (FeTSPc), a peroxidase mimic, was used as a labeling reagent and poly(N-isopropylacrylamide) (PNIP) as the separation support of the immune complex for the mimetic-enzymatic immunoassay of hepatitis B surface antigen (HBsAg). PNIP was precipitated from aqueous solution when the ambient temperature was higher than its lower critical solution temperature of 31 degrees C. In a sandwich immunoassay, the antigen (HBsAg) first reacted with mouse anti-human HBsAg antibody immobilized on PNIP (PNIP-antibody) and then further reacted with FeTSPc-labeled mouse anti-HBsAg antibody (antibody-FeTSPc) at room temperature in a homogeneous format. After changing the temperature to separate the PNIP-antibody-HBsAg-antibody-FeTSPc conjugate moiety, it was re-dissolved and determined by coupling with the fluorogenic reaction of hydrogen peroxide and p-hydroxyphenylpropionic acid. The sensitivity of this method (3 ng mL-1) was close to that of the traditional ELISA using the same reactants. However, the assay was much faster (the assay time decreased from 100-120 to 45 min). This method was applied to determine HBsAg in human serum with satisfactory results.
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Affiliation(s)
- Q Z Zhu
- Key Laboratory of Analytical Sciences of MOE and Department of Chemistry, Xiamen University, Xiamen 361005, China
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Zhu CQ, Li DH, Zhu QZ, Zheng H, Chen QY, Yang HH, Xu JG. Determination of proteins at nanogram levels by their quenching effect on large particle scattering of colloidal silver chloride. Fresenius J Anal Chem 2000; 366:863-8. [PMID: 11227423 DOI: 10.1007/s002160051586] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
A novel quantitative method for the determination of proteins in aqueous solutions has been based on the quenching of the resonance scattering light of colloidal silver chloride in the presence of proteins. The detection limits for eight kinds of proteins (BSA, HSA, egg albumin, human gamma-IgG,alpha-chymotrypsin, E. Coli. alpsase, myoglobin, alpha-casein) were at about 8 ng/mL; the linear ranges of the calibration curves were 10-400 ng/mL under optimal conditions,except for human gamma-IgG (20-400 ng/mL), myoglobin (10-300 ng/mL), and alpha-casein (10-300 ng/mL). Three wavelengths (398 nm, 475 nm, 499 nm) were all suitable for the determination and any acidity from pH 3.0 to pH 9.0 could be chosen. A few non-protein substances at high concentration levels interfered with this method, but this problem could simply be overcome by diluting the samples before the assay. Mechanism studies showed that the quenching effect of proteins on the scattering light of colloidal silver chloride was mainly due to the coagulation of AgCl particles retarded by protein. The method was employed for the determination of total protein in human serum with satisfactory results.
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Affiliation(s)
- C Q Zhu
- Department of Chemistry, Anhui Normal University, Wuhu, PR China
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Yang HH, Zhu QZ, Chen QY, Li DH, Xu JG. Application of magdala red as a fluorescence probe in the determination of nucleic acids. Fresenius J Anal Chem 2000; 366:303-6. [PMID: 11225676 DOI: 10.1007/s002160050057] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
A fluorescence quenching method was developed for the rapid determination of DNA and RNA using magdala red as fluorescence probe. In weakly acidic medium, the fluorescence of magdala red (lambdaex/lambdaem = 540/555 nm) can be largely quenched by DNA or RNA. The calibration graphs are linear over the range 0.01-1.2 microg/mL for both calf thymus DNA (CT DNA) and salmon DNA (SM DNA), and 0.015-1.0 microg/mL for yeast RNA, respectively. The corresponding detection limits are 6.0 ng/mL for CT DNA, 7.0 ng/mL for SM DNA and 15.0 ng/mL for yeast RNA, respectively. CT DNA could be determined in the presence of 20% (w/w) yeast RNA, and the relative standard deviation of six replicate measurements is 3.18% for 400 ng/mL of CT DNA. Interference from coexisting substances in the determination of DNA was also examined. Real samples were determined with satisfactory results.
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Affiliation(s)
- H H Yang
- Department of Chemistry, Xiamen University, P.R. China
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10
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Chen QY, Li DH, Zhao Y, Yang HH, Zhu QZ, Xu JG. Interaction of a novel red-region fluorescent probe, Nile blue, with DNA and its application to nucleic acids assay. Analyst 1999; 124:901-6. [PMID: 10736873 DOI: 10.1039/a901174i] [Citation(s) in RCA: 126] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A novel fluorimetric method was developed for the rapid determination of DNA and RNA based on their quenching effect on the cationic red-region fluorescent dye Nile Blue (NB). In the investigation of the interaction of NB with DNA by steady-state polarization measurements, thermal denaturing study, determination of absorption and fluorescence characteristics, salt effect study and electrophoresis experiments, the results supported the suggestion that NB served as an intercalator to the stack base pairs of nucleic acids. Further evidence showed that the quenching could be ascribed to the static quenching mode. A binding constant of about 10(6) M-1 and a binding site size of about three base pairs were obtained by spectral methods. Under optimum conditions, the calibration curves for the determination of calf thymus DNA (CT DNA) and yeast RNA were linear over the ranges 3.0 ng mL-1-2.0 micrograms mL-1 and 27 ng mL-1-10 micrograms mL-1, respectively. The detection limits were 3.0 ng mL-1 for CT DNA and 27 ng mL-1 for RNA. The relative standard deviation (n = 6) was within 2.1% in the middle of the linear range. Interferences from some interesting co-existing substances in the determination of DNA were also examined.
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Affiliation(s)
- Q Y Chen
- Department of Chemistry, Xiamen University, China
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11
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Abstract
A network of interacting cellular components is known to mediate the regulatory role of tumor suppressor protein p53 in genomic stability. DNA repair machinery is considered to be one of these vital cellular components. To investigate the modulatory function of p53 on the repair of DNA damage and related effects, we have studied the responses of human p53-wild-type (p53-WT), p53-mutant (p53-Mut) and p53-nullizygous (p53-Null) cells following exposure to UV irradiation. Absence of wild-type p53 function coincided with an enhanced sensitivity to UV, as well as induction of apoptosis. However, the lack of wild-type p53 expression did not affect the response of its signal transducer protein, p21. Repair analysis of specific genomic sequences, at a single nucleotide resolution, revealed that the removal of cyclobutane pyrimidine dimers in a non-transcribed strand was significantly slower in p53-Mut and p53-Null cell lines compared with the normal p53-WT cells. However, the repair of the transcribed strand was comparable in the three cell lines. Thus, p53 is required for the efficient nucleotide excision repair (NER) of the global genomic DNA, but not for the transcription-coupled repair of the essential genes. The decreased global NER, due to the lost p53 function, seems to be responsible for the conjoined cytotoxicity and apoptosis of human cells subjected to DNA stress damage.
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Affiliation(s)
- M A Wani
- Department of Radiology, Ohio State University, Columbus 43210, USA
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Zhu QZ, Xu JG, Guo XQ, Zheng XY, Li WY, Zhao YB. In-situ photochemical spectrofluorimetric detection of 9,10-anthraquinone-labeled bovine serum albumin. Spectrochim Acta A Mol Biomol Spectrosc 1997; 53A:2195-2200. [PMID: 9437874 DOI: 10.1016/s1386-1425(97)00123-6] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
Bovine serum albumin (BSA) labeled with 9,10-anthraquinone (AQ) shows a greatly enhanced photochemical fluorometric activity compared with that of free AQ. The spectral characteristics of the photoreduction product of conjugated AQ was investigated and large blue shifts in the excitation and emission bands compared with those of free AQ were observed. The enhancement in the photochemical reactivity can be employed for sensitive detection of labeled BSA by a simple in-situ photochemical kinetic fluorimetric method. The kinetic behavior of the photochemical reaction and the effects of some experimental conditions were investigated. The calibration graph was linear over the range 0-1.8 x 10(-7) M BSA. The detection limit was 1.2 x 10(-10) M BSA and the relative standard deviation was 2.24% for the 1.42 x 10(-8) M BSA (n = 7).
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Affiliation(s)
- Q Z Zhu
- Department of Chemistry, Xiamen University, People's Republic of China
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Zhu QZ, Xu JG, Guo XQ, Zheng XY, Li WY, Zhao YB. In-situ photochemical spectrofluorimetric detection of 9,10-anthraquinone-labeled bovine serum albumin. Spectrochim Acta A Mol Biomol Spectrosc 1997; 53A:1883-1887. [PMID: 9375413 DOI: 10.1016/s1386-1425(97)00075-9] [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] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
Bovine serum albumin (BSA) labeled with 9,10-anthraquinone (AQ) shows a greatly enhanced photochemical fluorimetric activity compared with that of free AQ. The spectral characteristics of the photoreduction product of conjugated AQ were investigated and large blue shifts in the excitation and emission bands compared with those of free AQ were observed. The enhancement in the photochemical reactivity can be employed for sensitive detection of labeled BSA by a simple in-situ photochemical kinetic fluorimetric method. The kinetic behavior of the photochemical reaction and the effects of some experimental conditions were investigated. The calibration graph was linear over the range 0-1.8 x 10(-7) M BSA. The detection limit was 1.2 x 10(-10) M BSA and the relative standard deviation was 2.24% for 1.42 x 10(-8) M BSA (n = 7).
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Affiliation(s)
- Q Z Zhu
- Research Laboratory of SEDC of Analytical Science for Material and Life Chemistry, Department of Chemistry, Xiamen University, People's Republic of China
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Abstract
A novel fluorimetric method has been developed for rapid determination of DNA and RNA with hypocrellin A (HA) as a fluorescence probe, based on the fluorescence enhancement of HA in the presence of DNA or RNA. Maximum fluorescence is produced in the pH range 3.4-4.0, with maximum excitation and emission wavelengths at 470 and 600 nm, respectively. Under optimal conditions, the calibration graphs are linear over the range 0-200.0 ng cm-3 for calf thymus DNA and 13.0-200.0 ng cm-3 for yeast RNA, respectively. The corresponding detection limits are 5.0 ng cm-3 for calf thymus DNA and 13.0 ng cm-3 for yeast RNA. The relative standard deviation of six replicate measurements is 4.5% for 100 ng cm-3 calf thymus DNA. DNA could be determined in the presence of 20% m/m yeast RNA. The mechanism for the binding of HA to DNA is also studied.
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Affiliation(s)
- Q Z Zhu
- Department of Chemistry, Xiamen University, China
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15
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Abstract
The oxidation reactions of three substrates, p-hydroxybenzoic acid (HBA), p-hydroxyphenylacetic acid, and p-hydroxyphenylpropionic acid, with H2O2 catalysed by hemin were studied. It was significant that only the oxidation product of HBA, di-p,p'-hydroxybenzoic acid, forms a long-lived fluorescent complex with Tb3+. The three substrates themselves do not form fluorescent complexes with Tb3+ although they have chemical structural similarities. Based on this, a novel lanthanide fluorescence system with a coupled reaction was developed. The possible reactive mechanism is discussed. HBA was concluded to be well suited to several types of application from hemin determination to bovine serum albumin labeling.
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Affiliation(s)
- X Y Zheng
- Department of Chemistry, Xiamen University, China
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Abstract
We report the purification, structure and biological properties of a peptide of novel sequence from human granulocytes that inhibits ACTH stimulated synthesis of corticosterone in rat adrenal cell suspensions. The peptide HP-4 is homologous to a previously described human granulocyte peptide HP-1 that has no anti-ACTH activity.
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Affiliation(s)
- A Singh
- Royal Victoria Hospital, Department of Medicine, Montreal, Quebec, Canada
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Zhu QZ, Hu J, Mulay S, Esch F, Shimasaki S, Solomon S. Isolation and structure of corticostatin peptides from rabbit fetal and adult lung. Proc Natl Acad Sci U S A 1988; 85:592-6. [PMID: 2829194 PMCID: PMC279597 DOI: 10.1073/pnas.85.2.592] [Citation(s) in RCA: 43] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023] Open
Abstract
A 34-amino acid peptide and three other structurally related peptides were isolated from rabbit fetal and adult lung. These cationic arginine- and cysteine-rich peptides inhibit corticotropin (ACTH)-stimulated rat adrenal cell corticosterone production. The peptide was called corticostatin (CSI). CSI was purified by reverse-phase HPLC and was shown to be homogenous from its amino acid analysis. Its sequence was determined on a gas-phase sequenator. The structure of CSI is Gly-Ile-Cys-Ala-Cys-Arg-Arg-Arg-Phe-Cys-Pro-Asn-Ser-Glu-Arg-Phe-Ser-Gly- Tyr-Cys - Arg-Val-Asn-Gly-Ala-Arg-Tyr-Val-Arg-Cys-Cys-Ser-Arg-Arg. CSI was found to markedly inhibit ACTH-stimulated corticosterone production by rat adrenal cells in vitro but did not affect basal levels. CSI did not affect the stimulation of aldosterone synthesis by angiotensin II in rat zona glomerulosa cells but it did suppress ACTH-stimulated aldosterone synthesis in whole adrenal cells, demonstrating that CSI is a specific inhibitor of ACTH-stimulated corticosteroid synthesis. The minimum effective concentration of CSI inhibiting ACTH-stimulated (33 pM) corticosterone production was 5 nM (20 ng/ml), the ED50 (50% effective dose) was 25 nM and steroidogenesis was completely inhibited at concentrations greater than 500 nM (2 micrograms/ml).
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Affiliation(s)
- Q Z Zhu
- Royal Victoria Hospital, Department of Medicine, McGill University, Montreal, Quebec, Canada
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Zhu QZ. [Pedigree study of primary open-angle glaucoma]. Zhonghua Yan Ke Za Zhi 1988; 24:6-9. [PMID: 3142753] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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Zhu QZ, Singh AV, Bateman A, Esch F, Solomon S. The corticostatic (anti-ACTH) and cytotoxic activity of peptides isolated from fetal, adult and tumor-bearing lung. J Steroid Biochem 1987; 27:1017-22. [PMID: 2826896 DOI: 10.1016/0022-4731(87)90184-1] [Citation(s) in RCA: 41] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
The possibility that corticosteroids influence lung maturation was suggested in 1968 by Buckingham et al. and supported by studies mounted in humans and in rabbits by Liggins and Howie and by a collaborative study from the N.I.H. To our knowledge no reverse process, i.e. the regulation of adrenal function by the lung, has been postulated. In attempting to isolate ACTH from fetal lung we found peptides which depressed corticosterone production. Eventually, we isolated a group of peptides from rabbit fetal lung which showed potent inhibition of corticosterone production in rat adrenal cell suspensions. Using high-resolution reverse-phase HPLC and high-sensitivity gas-phase sequencing techniques the primary structure of one of these peptides has been determined and it was called corticostatin. The adult rabbit lung contains a large quantity of a very similar peptide, which elutes close to corticostatin but whose amino acid composition differs by a single glycine and possibly a serine. This peptide is also potently corticostatic. We have isolated homologous human peptides but these show no apparent corticostatic activity in rat adrenal cell suspensions. They do, however, show interesting effects on in vitro growth of lung cell lines.
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Affiliation(s)
- Q Z Zhu
- Endocrine Laboratory, Royal Victoria Hospital, Montreal, Quebec, Canada
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