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Zheng H, Zheng Y, Huang W, Jiang L, Liu S, Miao P, Zhu N, Cao RY. Exploration of the Potential Biomarker FNDC5 for Discriminating Heart Failure in Patients with Coronary Atherosclerosis. J Cardiovasc Transl Res 2024:10.1007/s12265-024-10489-8. [PMID: 38376700 DOI: 10.1007/s12265-024-10489-8] [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] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/10/2023] [Accepted: 01/29/2024] [Indexed: 02/21/2024]
Abstract
Coronary atherosclerosis leading to ischemic artery disease is one of the etiological factors to develop heart failure (HF). This study aimed to investigate potential biomarkers for discriminating HF in atherosclerotic patients. This study included 40 consecutive atherosclerotic patients who underwent angiography. Concentrations of B-type natriuretic peptide (BNP), fibronectin type III domain containing 5 (FNDC5), and Phosphodiesterase 9A (PDE9A) were measured in 20 atherosclerotic patients with HF symptoms/signs and 20 without HF symptoms/signs. Circulating BNP levels were elevated, while FNDC5 levels were reduced in atherosclerotic patients with HF symptoms/signs compared to those without HF symptoms/signs. Pearson correlation analysis showed a significant correlation between FNDC5 and BNP. Receiver Operating Characteristics analysis indicated that both FNDC5 and BNP were able to discriminate HF in atherosclerotic patients. Our findings suggest that FNDC5, along with BNP, has independent value as a biomarker for discriminating HF in patients with coronary atherosclerosis.
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Affiliation(s)
- Hongchao Zheng
- Biomarker Exploring Program, Shanghai Xuhui Central Hospital/Zhongshan-Xuhui Hospital, Fudan University, 966 Middle Huaihai Road, Shanghai, 200031, China
| | - Yuntao Zheng
- Biomarker Exploring Program, Shanghai Xuhui Dahua Hospital, 901 Laohumin Road, Shanghai, 200237, China
| | - Wei Huang
- Biomarker Exploring Program, Shanghai Xuhui Dahua Hospital, 901 Laohumin Road, Shanghai, 200237, China
| | - Lingling Jiang
- Biomarker Exploring Program, Shanghai Xuhui Central Hospital/Zhongshan-Xuhui Hospital, Fudan University, 966 Middle Huaihai Road, Shanghai, 200031, China
| | - Siyu Liu
- Biomarker Exploring Program, Shanghai Xuhui Central Hospital/Zhongshan-Xuhui Hospital, Fudan University, 966 Middle Huaihai Road, Shanghai, 200031, China
| | - Peizhi Miao
- Biomarker Exploring Program, Shanghai Xuhui Central Hospital/Zhongshan-Xuhui Hospital, Fudan University, 966 Middle Huaihai Road, Shanghai, 200031, China
| | - Ning Zhu
- Biomarker Exploring Program, Shanghai Xuhui Central Hospital/Zhongshan-Xuhui Hospital, Fudan University, 966 Middle Huaihai Road, Shanghai, 200031, China
| | - Richard Y Cao
- Biomarker Exploring Program, Shanghai Xuhui Central Hospital/Zhongshan-Xuhui Hospital, Fudan University, 966 Middle Huaihai Road, Shanghai, 200031, China.
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Li M, Miao P, Yu J, Qiu Y, Zhu Y, Tong S. Influences of Hypothermia on the Cortical Blood Supply by Laser Speckle Imaging. IEEE Trans Neural Syst Rehabil Eng 2021; PP. [PMID: 34077361 DOI: 10.1109/tnsre.2009.2015181] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Induced hypothermia has been broadly applied in neurological intensive care unit (NICU). Meanwhile, accidental hypothermia is also a threatening condition in daily life. It is meaningful to investigate the influences of temperature change on the cerebral blood flow (CBF). In the present study, temporal laser speckle image contrast analysis (tLASCA) was implemented to study the relative CBF change in cerebral artery, vein and capillary level under mild (35$\circ$C) and moderate (32$\circ$C) hypothermia. Twelve male Sprague-Dawley rats (300±50g) were anesthetized with sodium pentobarbital and randomly assigned to mild and moderate hypothermia groups (n=9 each). Laser speckle imaging trials were acquired from baseline (37$\circ$C), hypothermia (35$\circ$C or 32$\circ$C) and post-rewarming (37$\circ$C) phases. In the mild group, mean CBF in different vessels all increased throughout the hypothermic and post-rewarming phases. On the contrary, mean CBF reduced by 10% to 20% at 32$\circ$C and returned to ~95% of the baseline level during the post-rewarming session in the moderate group. Besides, in the moderate group, a CBF rebound in vein was found in the post-rewarming phase. Our results suggested that the CBF changed differently between mild and moderate hypothermia, which may worth for further study in clinical. And we demonstrated LSI as a promising method to achieve high spatiotemporal resolution CBF change with minimal invasion.
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Tan Z, Miao P, Ishikawa Y, Hagihala M, Lee S, Torii S, Yonemura M, Kamiyama T. Synthesis, Structural and Magnetic Properties of La0.5Ba0.5CoO2.75+x. Atom Indo 2018. [DOI: 10.17146/aij.2018.781] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
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Miao P, Peng J, Chen C, Gai N, Yin F. [A novel mutation in KCNB1 gene in a child with neuropsychiatric comorbidities with both intellectual disability and epilepsy and review of literature]. Zhonghua Er Ke Za Zhi 2017; 55:115-119. [PMID: 28173649 DOI: 10.3760/cma.j.issn.0578-1310.2017.02.012] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Objective: To explore the association between the phenotype and KCNB1 gene mutation. Method: Clinical information including physical features, laboratory and genetic data of one patient of mental retardation with refractory epilepsy from Department of Pediatrics, Xiangya Hospital in January 2016 was analyzed. This patient was discovered to have KCNB1 gene mutations through whole exome sequencing. Relevant information about KCNB1 gene mutation was searched and collected from Pubmed, CNKI, Human Gene Mutation Database(HGMD) and Online Mendelian Inheritance in Man(OMIM). Searching was done using "KCNB1" as a keyword. Result: A 3.5 years old boy who visited our hospital firstly at the age of 2 years because of development delay came for follow up as he developed seizures.The forms included tonic, clonic seizures and spasm. The condition became more severe 10 months later. Electroencephalogram(EEG) showed high frequency discharge (>85%). He had poor response to multiple anti-epileptic drugs, methylprednisolone and ketogenic diet. At the age of 3, he started to have mental regression. Whole exome-sequencing study (trios) identified a novel heterozygous mutation c. G1136T (p.G379V) in KCNB1, which is not available in the databases mentioned above. This is the first case report of KCNB1 gene mutation in China. Eight cases have been reported so far worldwide and all of them were diagnosed with refractory epilepsy. Those 8 reported cases of encephalopathy were all due to de novo mutation. Conclusion: The main clinical features of patients with KCNB1 mutations include severe to profound intellectual disability, intractable seizures, hypotonia and regression of cognition and motor activity which lead to poor prognosis.
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Affiliation(s)
- P Miao
- Department of Pediatrics, Xiangya Hospital of Central South University/Hunan Intellectual and Developmental Disabilities Research Center, Changsha 410008, China
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Kousaka Y, Ogura T, Zhang J, Miao P, Lee S, Torii S, Kamiyama T, Campo J, Inoue K, Akimitsu J. Long Periodic Helimagnetic Ordering in CrM3S6(M = Nb and Ta). ACTA ACUST UNITED AC 2016. [DOI: 10.1088/1742-6596/746/1/012061] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Qi L, Zhao S, Li H, Guo Y, Xu G, Ge J, Wu S, Miao P, Jin Y, Yang J, Wu X, Ma C, Xu D, Luo J, Wang B, Li G, Wang F, Shen F, Shi H, Huo Y. [Efficacy comparison between 5 mg perindopril arginine salt and 4 mg perindopril tert-butylamine salt for patients with mild to moderate essential hypertension]. Zhonghua Xin Xue Guan Bing Za Zhi 2015; 43:863-867. [PMID: 26652987] [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] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
OBJECTIVE To compare the efficacy and safety of 5 mg perindopril arginine salt and 4 mg perindopril tert-butylamine salt for patients with mild to moderate essential hypertension. METHODS The study was designed as multicenter, randomized, double-blind, active controlled trial with two parallel groups enrolling 524 participants with mild to moderate essential hypertension. After 2-week run-in period, 186 patients were enrolled and randomly treated with 5 mg perindopril arginine salt and 183 patients were enrolled and randomly treated with 4 mg perindopril tert-butylamine salt. The random sequence was generated by the I.R.I.S., and a balance was made in each center. After double-blind treatment for 8 weeks, the dose could be doubled for patients with uncontrolled BP ((SBP) ≥ 140 mmHg (1 mmHg = 0.133 kPa) or diastolic blood pressure (DBP) ≥ 90 mmHg) and patients were treated for another 4 weeks. RESULTS The sitting SBP was similarly decreased by (19.9 ± 17.2) mmHg in perindopril arginine group and (18.5 ± 14.7) mmHg (P = 0.000 5) in perindopril tert-butylamine group post 8 weeks treatment. Dose was doubled in 109 patients (59.9%) in perindopril arginine group and 116 patients (63.7%) in perindopril tert-butylamine group. At 12 weeks post therapy, the sitting SBP decreased by (19.8 ± 16.2) and (19.6 ± 16.3) mmHg respectively in the 2 groups. The decrease of sitting DBP was also similar in both groups (-12.0 ± 10.0) mmHg and (-11.0 ± 8.9) mmHg (P < 0.000 1), respectively. The control rate or response rate was also similar between the two groups (control rate over 8 weeks was 38.5% vs. 31.3%, 95% CI (-2.6-16.9), control rate over 12 weeks was 36.3% vs. 35.7%, 95% CI (-9.3-10.4), response rate over 8 weeks was 64.3% vs. 63.2%, 95% CI (-8.8-11.0), response rate over 12 weeks was 65.9% vs. 64.8%, 95% CI (-8.7-10.9)). Incidence of adverse events was low and similar in both therapy groups. CONCLUSIONS The results show that perindopril arginine salt 5 mg is as efficient as perindopril tert-butylamine 4 mg on lowering BP for patients with mild to moderate essential hypertension. Both drugs have good safety profile and are well tolerated by patients in this cohort.
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Affiliation(s)
- Litong Qi
- Department of Cardiology, Peking University First Hospital, Beijing 100034, China
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Zheng H, Li N, Ding Y, Miao P. Losartan alleviates hyperuricemia-induced atherosclerosis in a rabbit model. Int J Clin Exp Pathol 2015; 8:10428-10435. [PMID: 26617751 PMCID: PMC4637566] [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] [Subscribe] [Scholar Register] [Received: 07/03/2015] [Accepted: 08/20/2015] [Indexed: 06/05/2023]
Abstract
OBJECTIVE To investigate the mechanisms underlying the therapeutic effects of losartan on hyperuricemia-induced aortic atherosclerosis, in an experimental rabbit model. METHODS Male rabbits (n = 48) were divided into control, hyperuricemia (HU), hypercholesterolemia + hyperuricemia (HC + HU) and high-purine with 30-mg/kg/d losartan (HU + losartan) groups. Serum uric acid (UA) and plasma renin and angiotensin II activities were determined. Aortic tissue specimens were analyzed for histological changes and proliferating cell nuclear antigen (PCNA). Liver tissues were sampled for quantitative analyses of liver low-density lipoprotein receptor (LDLR) mRNA and protein via reverse transcription polymerase chain reaction and western blotting. RESULTS After 12 weeks, serum UA and plasma renin and plasma angiotensin II activities were enhanced in the HU and HU + HC groups (P < 0.001) compared to the control, whereas in the HU + losartan group plasma renin activity was not different and serum UA concentrations as well as plasma angiotensin II activity were moderately enhanced (P < 0.05). Smooth muscle cell (SMC) PCNA expression increased strongly in the HU and HU + HC groups (P < 0.001), but was less pronounced in the HU + losartan group. In contrast, transcription and expression of LDLR mRNA and protein were significantly higher in the control and HU + losartan groups compared to the HU and HU + HC groups. Both the HU and HU + HC groups had elevated intima thickness and intima areas compared to the control and HU + losartan groups. CONCLUSIONS Losartan can alleviate experimental atherosclerosis induced by hyperuricemia.
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Affiliation(s)
- Hongchao Zheng
- Department of Cardiology, Xuhui District Central Hospital Shanghai, China
| | - Ning Li
- Department of Cardiology, Xuhui District Central Hospital Shanghai, China
| | - Yueyou Ding
- Department of Cardiology, Xuhui District Central Hospital Shanghai, China
| | - Peizhi Miao
- Department of Cardiology, Xuhui District Central Hospital Shanghai, China
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Zhiwen Z, Zheng H, Jia J, Yu S, Miao P, Zhao L, Zhou J, Zhou Z. GW25-e1610 The Effect of Berbamine on Acetylcholine-Induced Atrial Fibrillation in Rabbit. J Am Coll Cardiol 2014. [DOI: 10.1016/j.jacc.2014.06.942] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Chen W, Miao P, Li YG, Zhu HL, Zeng QF. Synthesis and solid state structures of two new copper(II) complexes of Schiff bases derived from furfuryl and tetrahydrofurfurylamine. RUSS J COORD CHEM+ 2010. [DOI: 10.1134/s1070328410120110] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Melanson M, Miao P, Eisenstat D, Gong Y, Gu X, Au K, Zhu W, Begum F, Frost EE, Namaka M. Experimental autoimmune encephalomyelitis-induced upregulation of tumor necrosis factor-alpha in the dorsal root ganglia. Mult Scler 2009; 15:1135-45. [DOI: 10.1177/1352458509106856] [Citation(s) in RCA: 20] [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] [Indexed: 11/16/2022]
Abstract
Background: Multiple sclerosis (MS) is a chronic, neurological disease characterized by targeted destruction of central nervous system (CNS) myelin. The autoimmune theory is the most widely accepted explanation of disease pathology. Circulating Th1 cells become activated by exposure to CNS-specific antigens such as myelin basic protein. The activated Th1 cells secrete inflammatory cytokines, which are pivotal for inflammatory responses. We hypothesize that enhanced production of inflammatory cytokines triggers cellular events within the dorsal root ganglia (DRG) and/or spinal cord, facilitating the development of neuropathic pain (NPP) in MS. NPP, the second worst disease-induced symptom suffered by patients with MS, is normally regulated by DRG and/or spinal cord. Objective: To determine gene and protein expression levels of tumor necrosis factor-alpha (TNFα) within DRG and/or spinal cord in an animal model of MS. Methods: Experimental autoimmune encephalomyelitis (EAE) was induced in adolescent female Lewis rats. Animals were sacrificed every 3 days post-disease induction. DRG and spinal cords were harvested for protein and gene expression analysis. Results: We show significant increases in TNFα expression in the DRG and of EAE animals at peak disease stage, as assessed by clinical symptoms. Conclusion: Antigen-induced production of inflammatory cytokines such as TNFα within the DRG identifies a potential novel mechanism for MS-induced NPP.
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Affiliation(s)
- M. Melanson
- Faculty of Pharmacy, Apotex Centre, University of Manitoba, Winnipeg, MB, Canada, Department of Neurology Multiple Sclerosis Clinic, Health Sciences Centre, University of Manitoba, Winnipeg, MB, Canada
| | - P. Miao
- Faculty of Pharmacy, Apotex Centre, University of Manitoba, Winnipeg, MB, Canada
| | - D. Eisenstat
- Department of Pediatrics and Child Health, University of Manitoba, Winnipeg, MB, Canada, Manitoba Institute of Cell Biology, University of Manitoba, Winnipeg, MB, Canada, Manitoba Institute of Child Health, University of Manitoba, Winnipeg, MB, Canada
| | - Y. Gong
- Faculty of Pharmacy, Apotex Centre, University of Manitoba, Winnipeg, MB, Canada
| | - X. Gu
- Faculty of Pharmacy, Apotex Centre, University of Manitoba, Winnipeg, MB, Canada
| | - K. Au
- Faculty of Pharmacy, Apotex Centre, University of Manitoba, Winnipeg, MB, Canada, Manitoba Institute of Child Health, University of Manitoba, Winnipeg, MB, Canada
| | - W. Zhu
- Faculty of Pharmacy, Apotex Centre, University of Manitoba, Winnipeg, MB, Canada, Manitoba Institute of Child Health, University of Manitoba, Winnipeg, MB, Canada
| | - F. Begum
- Manitoba Institute of Child Health, University of Manitoba, Winnipeg, MB, Canada, Department of Human Anatomy and Cell Science, University of Manitoba, Winnipeg, MB, Canada
| | - EE Frost
- Department of Human Anatomy and Cell Science, University of Manitoba, Winnipeg, MB, Canada, , Department of Pathology, University of Manitoba, Winnipeg, MB, Canada
| | - M. Namaka
- Faculty of Pharmacy, Apotex Centre, University of Manitoba, Winnipeg, MB, Canada, Department of Neurology Multiple Sclerosis Clinic, Health Sciences Centre, University of Manitoba, Winnipeg, MB, Canada, Manitoba Institute of Child Health, University of Manitoba, Winnipeg, MB, Canada
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Miao P, Cai DC, Xiang BR, An DK, Ito Y. Separation and Purification of Strychnine from Crude Extract of Strychnos nux-vomica L. by High-Speed Countercurrent Chromatography. J LIQ CHROMATOGR R T 2006. [DOI: 10.1080/10826079808001945] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- P. Miao
- a Instrument Center of China Pharmaceutical University , Nanjing, 210009, China
| | - D.-C. Cai
- b Research Center of Pharmacy of the PLA Navy , Shanghai, 200083, China
| | - B.-R. Xiang
- a Instrument Center of China Pharmaceutical University , Nanjing, 210009, China
| | - D.-K. An
- a Instrument Center of China Pharmaceutical University , Nanjing, 210009, China
| | - Y. Ito
- c Laboratory of Biophysical Chemistry , National Heart, Lung, and Blood Institute , National Institutes of Health Bldg. 10, Rm 7N322, Bethesda, MD, 20892, USA
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Miao P, Robinson AW, Palmer RE, Kariuki BM, Harris KDM. Structural Properties of Self-Organized Organo-Silicon Macromolecular Films Investigated by Scanning Tunneling Microscopy and X-ray Diffraction. J Phys Chem B 2000. [DOI: 10.1021/jp993167r] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Affiliation(s)
- S. C. Ng
- Department of Chemistry, National University of Singapore, Singapore 119260
| | - P. Miao
- Department of Chemistry, National University of Singapore, Singapore 119260
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Lu X, Miao P, Watson AT, Pepin GP, Moss RM, Semmelbeck M. X-ray computed tomography studies of gas storage and transport in Devonian shales. AIChE J 1994. [DOI: 10.1002/aic.690400715] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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McElligott MA, Miao P, Dice JF. Lysosomal degradation of ribonuclease A and ribonuclease S-protein microinjected into the cytosol of human fibroblasts. J Biol Chem 1985; 260:11986-93. [PMID: 4044585] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
We have analyzed the subcellular localization of 125I-labeled ribonuclease A and ribonuclease S-protein (residues 21-124) after erythrocyte-mediated microinjection into confluent cultures of IMR-90 human lung fibroblasts. Microinjected cells were fractionated by two consecutive Percoll gradients, and the distribution of radioactive ribonuclease A and S-protein was compared to patterns for known enzyme markers. Ribonuclease A is localized in the cytosol immediately after microinjection, but thereafter a portion of the microinjected enzyme is associated with lysosomes. We obtained similar results for ribonuclease S-protein except extensive association with a nonlysosomal intracellular structure is also evident. The effects of ammonium chloride on proteolysis indicate that ribonuclease A and ribonuclease S-protein are degraded at least in part by lysosomal pathways. Degradation of long-lived cellular proteins is inhibited by 17% in the presence of serum and by 35% in the absence of serum. The effects of ammonium chloride on catabolism of microinjected proteins are more variable. Inhibition in the presence and absence of serum ranged between 43 and 64% for both ribonuclease A and ribonuclease S-protein. To quantitatively assess the role of lysosomal and cytosolic pathways in the degradation of microinjected proteins, we have tagged proteins with the inert trisaccharide, [3H] raffinose. The radioactive degradation products of such proteins are completely retained within lysosomes since the lysosomal membrane is impermeable to [3H] raffinose coupled to lysine or small peptides. These studies show that ribonuclease A and S-protein are degraded almost entirely by lysosomes while bovine serum albumin is degraded principally in the cytosol. A mixture of rat liver cytosolic proteins is degraded approximately 60% in the cytosol and 40% by lysosomes confirming that both lysosomal and nonlysosomal pathways of proteolysis are important in confluent human fibroblasts.
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McElligott MA, Miao P, Dice JF. Lysosomal degradation of ribonuclease A and ribonuclease S-protein microinjected into the cytosol of human fibroblasts. J Biol Chem 1985. [DOI: 10.1016/s0021-9258(17)38974-3] [Citation(s) in RCA: 27] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
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Abstract
The relationship between lipoproteins and growth of aortic smooth muscle cells has been a matter of controversy. We therefore reexamined this issue using serum-free defined media methodology. By themselves, LDL or HDL (50-500 micrograms/ml) from normolipemic human or bovine plasma produced little or no growth of homologous aortic smooth muscle cells incubated in serum-free medium that was supplemented with insulin and transferrin to maintain cell viability. In fact, LDL prepared in the absence of an antioxidant (BHT) was toxic to these cells. However, in the presence of maximally effective concentrations of platelet-derived growth factor (PDGF), LDL or HDL consistently increased the growth of homologous smooth muscle cells (up to twofold increased in DNA accumulation in 48 hr). Lipoproteins also augmented the growth response of arterial smooth muscle cells to fibroblast growth factor or epidermal growth factor. The mechanism of this effect was investigated further with HDL, because, in contrast to LDL, HDL apoproteins are water-soluble. Neither HDL delipidated by solvent extraction (apoHDL), purified bovine apoA-I, nor cholesterol added in the form of phospholipid vesicles appreciably increased PDGF-induced growth of bovine smooth muscle cells. However, HDL-like particles reconstituted by sonication of apoHDL with cholesterol and phospholipids did increase the growth of cultures of bovine smooth muscle cells treated with PDGF. Uptake of tritiated thymidine by cultures incubated with partially purified PDGF alone (10 micrograms/ml) was 5,693 +/- 235 dpm/24 hr compared to 10,381 +/- 645 dpm/24 hr (p less than 0.01) in the presence of both PDGF and reconstituted HDL-like particles (250 micrograms protein/ml). Thus both the lipid and protein components of HDL may be necessary for optimal potentiation of growth of mitogen-stimulated cells. These results indicate that lipoproteins from normolipemic sera are not bona fide growth factors but can potentiate the growth of mitogen-stimulated cells, perhaps by supplying exogenous cholesterol required for membrane biogenesis. This finding might be important in arterial injury when the release of PDGF and exposure to plasma lipoproteins could act in concert to stimulate the proliferation of smooth muscle cells.
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Black VH, Mierlak J, Katz T, Miao P, Huima T, McNamara N. Isolated guinea pig adrenocortical cells in vitro: morphology and steroidogenesis in control and ACTH-treated cultures. Am J Anat 1982; 165:225-48. [PMID: 6295129 DOI: 10.1002/aja.1001650302] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Isolated guinea pig adrenocortical cells were maintained in long-term culture in order to perform sequential experiments on the same cell populations. The cells produced fluorogenic steroids, shown by thin-layer chromatography to be at least aldosterone, cortisol, and corticosterone. In addition, they increased production of these steroids when treated with either ACTH or dibutyryl cyclic AMP. Of particular interest was the fact that cultures treated for the initial 24-hour culture period with ACTH maintained enhanced levels of secretion for several days in absence of hormone and had an enhanced response to ACTH later in the culture period. Such enhancement of secretion was not seen following early treatment with dibutyryl cyclic AMP. The fine structure of the ACTH-treated cells was consistent with increased steroidogenesis. They possessed more smooth-surfaced endoplasmic reticulum, larger mitochondrial crystal surfaces, and larger Golgi complexes than the cells in untreated cultures.
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Abstract
This paper reports a quick, relatively simple and reproducible technique for obtaining populations of zona fasciculata and zona glomerulosa cells up to 80-90% pure, which can be maintained in vitro for study of adrenocortical cell function. Isolated guinea pig adrenocortical cells were separated on a 1-28% bovine serum albumin/Ca++, Mg++-free buffer gradient (wt/vol at 4% increments) using equilibrium density centrifugation (570 g, 30 min). Over 60% of the 8 x 10(5) viable cells/adrenal obtained in the total isolate were recovered after separation. 80% of the zona glomerulosa cells were found in the lower three bands of the gradient. 78% of the zona fasciculata cells were found in the top three bands. Of the cells in the first two bands, 78-91% were zona fasciculata cells, whereas of the cells in the bottom two bands 92-95% were zona glomerulosa cells. The cells retained the morphological characteristics of cells in situ and could be maintained in vitro for periods up to 11 d. They produced a wide variety of steroids, cortisol, corticosterone, aldosterone, 11-beta-hydroxyandrostenedione, deoxycortisol, deoxycorticosterone, cortisone, 18-hydroxycorticosterone, and a product tentatively identified as dehydroepiandrosterone, and they responded to ACTH in a dose-responsive manner with enhanced levels of steroid output. Zona glomerulosa-enriched populations differed from zona fasciculata-enriched populations in their abundant production of aldosterone and in the pattern of steroid production. None of the cultures responded to angiotensin II (100 pg/ml) with increased steroid production.
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Abstract
Erythrocyte ghosts loaded with 125I-labeled proteins were fused with confluent monolayers of IMR-90 fibroblasts using polyethylene glycol. Erythrocyte-mediated microinjection of 125I-proteins did not seriously perturb the metabolism of the recipient fibroblasts as assessed by measurements of rates of protein synthesis, rates of protein degradation, or rates of cellular growth after addition of fresh serum. A mixture of cytosolic proteins was degraded after microinjection according to expected characteristics established for catabolism of endogenous cytosolic proteins. Furthermore, withdrawal of serum, insulin, fibroblast growth factor, and dexamethasone from the culture medium increased the degradative rates of microinjected cytosolic proteins, and catabolism of long-lived proteins was preferentially enhanced with little or no effect on degradation of short-lived proteins. Six specific polypeptides were degraded after microinjection with markedly different half-lives ranging from 20 to 320 h. Degradative rates of certain purified proteins (but not others) were also increased in the absence of serum, insulin, fibroblast growth factor, and dexamethasone. The results suggest that erythrocyte-mediated microinjection is a valid approach for analysis of intracellular protein degradation. However, one potential limitation is that some microinjected proteins are structurally altered by the procedures required for labeling proteins to high specific radioactivities. Of the four purified proteins examined in this regard, only ribonuclease A consistently showed unaltered enzymatic activity and unaltered susceptibility to proteolytic attack in vitro after iodination.
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