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Liu J, Wan XX, Zheng SY, He HH, Khan MA, Feng YX, Xiao JG, Chen Y, Hu XM, Zhang Q, Xiong K. Mesenchymal Stem Cell Transplantation in Type 1 Diabetes Treatment: Current Advances and Future Opportunity. Curr Stem Cell Res Ther 2023; 19:CSCR-EPUB-135081. [PMID: 37817652 DOI: 10.2174/011574888x268740231002054459] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2023] [Revised: 08/27/2023] [Accepted: 09/01/2023] [Indexed: 10/12/2023]
Abstract
Type 1 Diabetes (T1D) is characterized by hyperglycemia, and caused by a lack of insulin secretion. At present there is no cure for T1D and patients are dependent on exogenous insulin for lifelong, which seriously affects their lives. Mesenchymal stem cells (MSCs) can be differentiated to β cell-like cells to rescue the secretion of insulin and reconstruct immunotolerance to preserve the function of islet β cells. Due to the higher proportion of children and adolescents in T1D patients, the efficacy and safety issue of the application of MSC's transplant in T1D was primarily demonstrated and identified by human clinical trials in this review. Then we clarified the mechanism of MSCs to relieve the symptom of T1D and found out that UC-MSCs have no obvious advantage over the other types of MSCs, the autologous MSCs from BM or menstrual blood with less expanded ex vivo could be the better choice for clinical application to treat with T1D through documentary analysis. Finally, we summarized the advances of MSCs with different interventions such as genetic engineering in the treatment of T1D, and demonstrated the advantages and shortage of MSCs intervened by different treatments in the transplantation, which may enhance the clinical efficacy and overcome the shortcomings in the application of MSCs to T1D in future.
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Affiliation(s)
- Jie Liu
- Department of Endocrinology, Third Xiangya Hospital, Central South University, Changsha, 410013, China
| | - Xin-Xing Wan
- Department of Endocrinology, Third Xiangya Hospital, Central South University, Changsha, 410013, China
| | - Sheng-Yuan Zheng
- Clinical Medicine Eight-year Program, 19 Grade, Xiangya School of Medicine, Central South University, Changsha, 410013, China
| | - Hui-Hong He
- Department of Endocrinology, Third Xiangya Hospital, Central South University, Changsha, 410013, China
| | | | - Yu-Xing Feng
- Clinical Medicine Eight-year Program, 19 Grade, Xiangya School of Medicine, Central South University, Changsha, 410013, China
| | - Jing-Ge Xiao
- Clinical Medicine Eight-year Program, 19 Grade, Xiangya School of Medicine, Central South University, Changsha, 410013, China
| | - Yu Chen
- Clinical Medicine Eight-year Program, 19 Grade, Xiangya School of Medicine, Central South University, Changsha, 410013, China
| | - Xi-Min Hu
- Clinical Medicine Eight-year Program, 17 Grade, Xiangya School of Medicine, Central South University, Changsha, 410013, China
| | - Qi Zhang
- Department of Anatomy and Neurobiology, School of Basic Medical Science, Central South University, Changsha, 410013, China
- Key Laboratory of Emergency and Trauma, Ministry of Education, College of Emergency and Trauma, Hainan Medical University, Haikou, 57119, China
| | - Kun Xiong
- Department of Anatomy and Neurobiology, School of Basic Medical Science, Central South University, Changsha, 410013, China
- Key Laboratory of Emergency and Trauma, Ministry of Education, College of Emergency and Trauma, Hainan Medical University, Haikou, 57119, China
- Hunan Key Laboratory of Ophthalmology, Changsha, 410008, China
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Feng YX, Zhang S, Wei X. [Ultrasonographic features and clinical pathological of liver metastasis in patients with melanoma]. Zhonghua Zhong Liu Za Zhi 2022; 44:354-359. [PMID: 35448924 DOI: 10.3760/cma.j.cn112152-20200305-00172] [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] [Indexed: 06/14/2023]
Abstract
Objective: To investigate the ultrasonographic features and clinical pathological of liver metastasis in patients with melanoma. Methods: Thirteen patients with liver metastasis from melanoma treated in Tianjin Medical University Cancer Institute and Hospital from 2013 to 2019 were selected, and their ultrasonographic and clinicopathological characteristics were analyzed retrospectively. Results: Eleven of the 13 patients had multiple liver lesions. The maximum diameter of the lesions was (5.89±2.73) cm. Five cases of lesions were mixed echo (3 cases with high melanin content), 4 cases of lesions were hyperechoic (3 cases with low melanin content), 3 cases of lesions were hypoechoic (all with high melanin content), 1 case of lesions were equal echo (with high melanin content). The lesions in 11 patients had clear boundaries, while other 2 patients lacked the clear borders. Cystic areas were present in the lesions of 3 patients. Six cases had irregular lesions (lobulated), and 7 cases had regular lesions (round, oval). There were acoustic halos around the lesion in 9 cases and smooth and uneven acoustic halos in 5 cases. The results of immunohistochemistry showed that 11 cases were positive for S-100, HMB45 and Melan-A. One patient was not tested for HMB45, while S-100 and Melan-A were positive. One patient did not undergo Melan-A test, while S-100 and HMB45 were positive. Conclusion: Most of the liver metastases of melanoma are mixed echo or hyperechoic, most of them are nodular with clear boundaries combined with vocal halo, and a few of the lesions have cystic areas.
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Affiliation(s)
- Y X Feng
- National Clinical Research Center of Cancer, Tianjin's Key Laboratory of Cancer Prevention and Therapy, Tianjin's Clinical Research Center for Cancer, Department of Ultrasound Diagnosis and Treatment, Tianjin Medical University Cancer Institute and Hospital, Tianjin 300060, China
| | - S Zhang
- National Clinical Research Center of Cancer, Tianjin's Key Laboratory of Cancer Prevention and Therapy, Tianjin's Clinical Research Center for Cancer, Department of Ultrasound Diagnosis and Treatment, Tianjin Medical University Cancer Institute and Hospital, Tianjin 300060, China
| | - X Wei
- National Clinical Research Center of Cancer, Tianjin's Key Laboratory of Cancer Prevention and Therapy, Tianjin's Clinical Research Center for Cancer, Department of Ultrasound Diagnosis and Treatment, Tianjin Medical University Cancer Institute and Hospital, Tianjin 300060, China
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Yao LJ, Feng YX, Jiang GY, Liu ZQ, He XW, Zhou J. [Tapping along meridians on back combined with acupuncture of "Qi Shen Zhen" (Seven acupoints for regulating mind) improves symptoms of post-stroke anxiety disorder patients]. Zhen Ci Yan Jiu 2020; 45:990-4. [PMID: 33415858 DOI: 10.13702/j.1000-0607.200294] [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: 11/12/2022]
Abstract
OBJECTIVE To observe the effect of round magnetic needle tapping along meridians on the back plus acupuncture at "Qi Shen Zhen"(including Shenting [GV24], Benshen [GB13], Sishenchong [EX-HN1]), and Baihui (GV20), Shenmen (HT7) on gastrointestinal function, daily living activities and anxiety status in post-stroke anxiety disorder (PSAD) patients. METHODS Fifty-seven PSAD patients were randomly divided into acupuncture group (28 cases) and medication group (29 cases). On the basis of routine treatment and physical therapy, patients of the acupuncture group were treated by applying round magnetic needle to mildly tapping the second line→the first line of the Bladder Meridian→Jiaji acupoints→Governor Meridian on the back from outside to the inside in sequence for 20 min, followed by needling GV24, GV20, GB13, EX-HN1 and HT7, respectively, with the needles retained for 30 min after one minute's twisting. The treatment was conducted once daily, 5 times a week, for 6 weeks. Patients of the medication group were asked to take Escitalopram Oxalate tablets (5-20 mg/d) for 6 weeks. The Hamilton Anxiety Rating Scale (HAMA) was used to assess the patient's severity of anxiety, cognition, somatic sensation, symptoms of cardiovascular, respiratory, gastrointestinal, urogenital, automatic and muscular systems, the Barthel Index (BI) used to evaluated the activities of daily living (ADL), and the gastrointestinal function (Spleen-stomach Symptom Score [SSS]) assessed according to the "Standards for Diagnosis and Curative Effect Evaluation of Syndromes of Traditional Chinese Medicine". The adverse reactions were observed at the end of treatment. RESULTS After the treatment, the HAMA scores at the 2nd, 4th and 6th week and the SSS scores at the 4th and 6th week were significantly decreased (P<0.05), and the BI scores at the 2nd, 4th and 6th week were considerably increased in both acupuncture and medication groups compared with their own pre-treatment (P<0.05). The HAMA score at the 2nd week, and the SSS scores at the 2nd, 4th and 6th week were obviously lower(P<0.05), and the BI score at the 6th week was notably higher in the acupuncture group than in the medication group (P<0.05). No significant diffe-rence was found between the two groups in the therapeutic effect of anxiety state (P>0.05). The acupuncture group had fewer adverse reactions than the medication group (P<0.05). CONCLUSION The round magnetic needle tapping plus "Qi Shen Zhen" needling has a significant therapeutic effect in improving PSAD patients' anxiety state, being similar to Escitalopram Oxalate tablets in reducing anxiety state and being superior to Escitalopram in improving gastrointestinal function and daily living activities.
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Affiliation(s)
- Li-Jun Yao
- Department of Rehabilitation Medicine, Chongqing Ninth People's Hospital, Chongqing 400700, China
| | - Yu-Xing Feng
- Department of Rehabilitation Medicine, Chongqing Ninth People's Hospital, Chongqing 400700, China
| | - Guo-Yan Jiang
- The Third Affiliated Hospital of Chongqing Medical University, Chongqing 401120
| | - Zhao-Qing Liu
- Department of Rehabilitation Medicine, Chongqing Ninth People's Hospital, Chongqing 400700, China
| | - Xue-Wen He
- Department of Rehabilitation Medicine, Chongqing Ninth People's Hospital, Chongqing 400700, China
| | - Jin Zhou
- Department of Rehabilitation Medicine, Chongqing Ninth People's Hospital, Chongqing 400700, China
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Sokol ES, Feng YX, Jin DX, Basudan A, Lee AV, Atkinson JM, Chen J, Stephens PJ, Frampton GM, Gupta PB, Ross JS, Chung JH, Oesterreich S, Ali SM, Hartmaier RJ. Loss of function of NF1 is a mechanism of acquired resistance to endocrine therapy in lobular breast cancer. Ann Oncol 2020; 30:115-123. [PMID: 30423024 PMCID: PMC6336006 DOI: 10.1093/annonc/mdy497] [Citation(s) in RCA: 49] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
Abstract
Background Invasive lobular carcinoma (ILC) as a disease entity distinct from invasive ductal carcinoma (IDC) has merited focused studies of the genomic landscape, but those to date are largely limited to the assessment of early-stage cancers. Given that genomic alterations develop as acquired resistance to endocrine therapy, studies on refractory ILC are needed. Patients and methods Tissue from 336 primary-enriched, breast-biopsied ILC and 485 estrogen receptor (ER)-positive IDC and metastatic biopsy specimens from 180 ILC and 191 ER-positive IDC patients was assayed with hybrid-capture-based comprehensive genomic profiling for short variant, indel, copy number variants, and rearrangements in up to 395 cancer-related genes. Results Whereas ESR1 alterations are enriched in the metastases of both ILC and IDC compared with breast specimens, NF1 alterations are enriched only in ILC metastases (mILC). NF1 alterations are predominantly under loss of heterozygosity (11/14, 79%), are mutually exclusive with ESR1 mutations [odds ratio = 0.24, P < 0.027] and are frequently polyclonal in ctDNA assays. Assessment of paired specimens shows that NF1 alterations arise in the setting of acquired resistance. An in vitro model of CDH1 mutated ER-positive breast cancer demonstrates that NF1 knockdown confers a growth advantage in the presence of 4-hydroxy tamoxifen. Our study further identified a significant increase in tumor mutational burden (TMB) in mILCs relative to breast ILCs or metastatic IDCs (8.9% >20 mutations/mb; P < 0.001). Most TMB-high mILCs harbor an APOBEC trinucleotide signature (14/16; 88%). Conclusions This study identifies alteration of NF1 as enriched specifically in mILC. Mutual exclusivity with ESR1 alterations, polyclonality in relapsed ctDNA, and de novo acquisition suggest a role for NF1 loss in endocrine therapy resistance. Since NF1 loss leads to RAS/RAF kinase activation, patients may benefit from a matched inhibitor. Moreover, for an independent subset of mILC, TMB was elevated relative to breast ILC, suggesting possible benefit from immune checkpoint inhibitors.
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Affiliation(s)
- E S Sokol
- Foundation Medicine Inc., Cambridge.
| | - Y X Feng
- Department of Biology, Massachusetts Institute of Technology, Cambridge
| | - D X Jin
- Foundation Medicine Inc., Cambridge; Department of Biology, Massachusetts Institute of Technology, Cambridge
| | - A Basudan
- University of Pittsburgh, Pittsburgh; Womens Cancer Research Center, Department of Genetics, University of Pittsburgh, UPMC Hillman Cancer Center, Pittsburgh
| | - A V Lee
- University of Pittsburgh, Pittsburgh; Womens Cancer Research Center, Department of Pharmacology and Chemical Biology, University of Pittsburgh, UPMC Hillman Cancer Center, Pittsburgh
| | - J M Atkinson
- University of Pittsburgh, Pittsburgh; Womens Cancer Research Center, Department of Pharmacology and Chemical Biology, University of Pittsburgh, UPMC Hillman Cancer Center, Pittsburgh
| | - J Chen
- University of Pittsburgh, Pittsburgh; Womens Cancer Research Center, Department of Pharmacology and Chemical Biology, University of Pittsburgh, UPMC Hillman Cancer Center, Pittsburgh
| | | | | | - P B Gupta
- Department of Biology, Massachusetts Institute of Technology, Cambridge
| | - J S Ross
- Foundation Medicine Inc., Cambridge; Upstate Medical University, Syracuse, USA
| | | | - S Oesterreich
- University of Pittsburgh, Pittsburgh; Womens Cancer Research Center, Department of Pharmacology and Chemical Biology, University of Pittsburgh, UPMC Hillman Cancer Center, Pittsburgh
| | - S M Ali
- Foundation Medicine Inc., Cambridge
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Feng YX, Zhang S, Xin XJ. [Contrastive analysis of ultrasonographic features of synchronous and heterochronic liver metastasis in patients with stromal tumor]. Zhonghua Zhong Liu Za Zhi 2018; 40:829-832. [PMID: 30481933 DOI: 10.3760/cma.j.issn.0253-3766.2018.11.006] [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 ultrasonographic features of synchronous and heterochronic liver metastasis in patients with stromal tumors, and to elucidate the value of ultrasonic examination in follow-up surgery. Methods: A total of 1 516 patients with pathologically confirmed gastrointestinal stromal tumors (GISTs) and extra-gastrointestinal stromal tumors (EGISTs) were enrolled. The ultrasonographic features of primary lesions and liver metastases in a total of 46 cases with 95 liver metastases were analyzed. Results: 24 out of 46 cases had primary lesion in the small intestine, 14 in the stomach, 4 in the abdominal cavity, 1 in the colon, 2 in the esophagus, and 1 in the mesentery. The expression of CD117, Dog-1 and CD34were detected by immunohistochemical staining. The positive rate of CD117 was 100%, the Dog-1 was 95.7% and the CD34 was 69.6%. There were statistically significant differences in the maximum diameter, boundary and blood flow of primary tumors in 28 patients with synchronous liver metastasis and 18 patients with heterochronic liver metastasis (P=0.001, 0.022 and 0.036, respectively). Of the 95 liver metastases, 86 (90.5%) were located in the right lobe of the liver, 79 (83.2%) had clear boundaries, 75 (78.9%) were hypoechoic or isoechoic, 55 (57.9%) showed colored patterns, and 68 (71.6%) had no halo.11 liver metastases were cystic masses, 59 were solid masses, and 25 were mixed masses. There was a statistically significant difference in blood flow between 65 synchronous hepatic metastases and 30 heterochronic liver metastases (P=0.017). Conclusions: There were differences of the primary tumor ultrasonographic features between the synchronous metastasis group and heterochronic metastasis group. The ultrasonographic features of primary tumors and liver metastases have important clinical significance for the diagnosis, follow-up and treatment of malignant mesenchymal tumors.
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Affiliation(s)
- Y X Feng
- Department of Ultrasound Diagnosis and Treatment, Tianjin Medical University Cancer Institute and Hospital, National Clinical Research Center of Cancer, Tianjin's Key Laboratory of Cancer Prevention and Therapy, Tianjin's Clinical Research Center for cancer, Tianjin 300060, China
| | - S Zhang
- Department of Ultrasound Diagnosis and Treatment, Tianjin Medical University Cancer Institute and Hospital, National Clinical Research Center of Cancer, Tianjin's Key Laboratory of Cancer Prevention and Therapy, Tianjin's Clinical Research Center for cancer, Tianjin 300060, China
| | - X J Xin
- Department of Ultrasound Diagnosis and Treatment, Tianjin Medical University Cancer Institute and Hospital, National Clinical Research Center of Cancer, Tianjin's Key Laboratory of Cancer Prevention and Therapy, Tianjin's Clinical Research Center for cancer, Tianjin 300060, China
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Abstract
A single dose of caudal lidocaine does not provide a sufficiently long anaesthetic duration and is not generally used for complicated anorectal surgery. This study evaluated the safety and efficacy of a ropivacaine–lidocaine combination for caudal anaesthesia in patients undergoing haemorrhoidectomy. A total of 287 haemorrhoid patients with successful initial caudal anaesthesia were randomized to receive either a mixture of 0.375% ropivacaine and 1.0% lidocaine (ropi–lido group; n = 146) or 1.0% lidocaine alone (placebo-lido group; n = 141). Significantly fewer patients in the ropi–lido group required intra-operative supplemental anaesthesia than in the placebo-lido group. Patients treated with the ropivacaine–lidocaine combination had significantly lower scores for pain at each post-operative time point, and a longer mean time to the first requirement for post-operative analgesic than patients in the placebo-lido group. These results suggest that caudal anaesthesia with a combination of ropivacaine and lidocaine is a safe and effective method of inducing anaesthesia during haemorrhoidectomy.
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Affiliation(s)
- F Ye
- Department of Colorectal Surgery, First Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, China
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Fillon S, Wärntges S, Matskevitch J, Moschen I, Setiawan I, Gamper N, Feng YX, Stegen C, Friedrich B, Waldegger S, Bröer S, Wagner CA, Huber SM, Klingel K, Vereninov A, Lang F. Serum- and glucocorticoid-dependent kinase, cell volume, and the regulation of epithelial transport. Comp Biochem Physiol A Mol Integr Physiol 2001; 130:367-76. [PMID: 11913450 DOI: 10.1016/s1095-6433(01)00422-6] [Citation(s) in RCA: 17] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
Ample pharmacological evidence points to a role of kinases in the regulation of cell volume. Given the limited selectivity of most inhibitors, however, the specific molecules involved have remained largely elusive. The search for cell volume regulated genes in liver HepG2 cells led to the discovery of the human serum- and glucocorticoid-dependent serine/threonine kinase hsgk1. Transcription and expression of hsgk1 is markedly and rapidly upregulated by osmotic and isotonic cell shrinkage. The effect of osmotic cell shrinkage on hsgk1 is mediated by p38 kinase. Further stimuli of hsgk1 transcription include glucocorticoids, aldosterone, TGF-beta1, serum, increase of intracellular Ca2+ and phorbolesters, whereas cAMP downregulates hsgk1 transcription. The hsgk1 protein is expressed in several epithelial tissues including human pancreas, intestine, kidney, and shark rectal gland. Co-expression of hsgk1 with the renal epithelial Na+-channel ENaC or the Na+/K+/2Cl(-)-cotransporter NKCC2 (BSC1) in Xenopus oocytes, accelerates insertion of the transport proteins into the cell membrane and thus, stimulates channel or transport activity. Thus, hsgk1 participates in the regulation of transport by steroids and secretagogues increasing intracellular Ca2+-activity. The stimulation of hsgk1 transcription by TGF-beta1 may further bear pathophysiological relevance.
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Affiliation(s)
- S Fillon
- Department of Physiology, University of Tübingen, Germany
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Abstract
The yeast retrotransposon Ty1 resembles retroviruses in a number of important respects but also shows several fundamental differences from them. We now report that, as in retroviruses, the genomic RNA in Ty1 virus-like particles is dimeric. The Ty1 dimers also resemble retroviral dimers in that they are stabilized during the proteolytic maturation of the particle. The stabilization of the dimer suggests that one of the cleavage products of TyA1 possesses nucleic acid chaperone activity.
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Affiliation(s)
- Y X Feng
- HIV Drug Resistance Program, National Cancer Institute-Frederick Cancer Research and Development Center, Frederick, Maryland 21702-1201, USA
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Feng YX, Campbell S, Harvin D, Ehresmann B, Ehresmann C, Rein A. The human immunodeficiency virus type 1 Gag polyprotein has nucleic acid chaperone activity: possible role in dimerization of genomic RNA and placement of tRNA on the primer binding site. J Virol 1999; 73:4251-6. [PMID: 10196321 PMCID: PMC104204 DOI: 10.1128/jvi.73.5.4251-4256.1999] [Citation(s) in RCA: 129] [Impact Index Per Article: 5.2] [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: 02/06/2023] Open
Abstract
The formation of an infectious retrovirus particle requires several RNA-RNA interaction events. In particular, the genomic RNA molecules form a dimeric structure, and a cellular tRNA molecule is annealed to an 18-base complementary region (the primer binding site, or PBS) on the genomic RNA, where it will serve as primer for reverse transcription. tRNAs normally possess a highly stable secondary and tertiary structure; it seems unlikely that annealing of a tRNA molecule to the PBS, which involves unwinding of this structure, could occur efficiently at physiological temperatures without the assistance of a cofactor. Many prior studies have shown that the viral nucleocapsid (NC) protein can act as a nucleic acid chaperone (i.e., facilitate annealing events between nucleic acids), and the assays used to demonstrate this activity include its ability to catalyze dimerization of transcripts representing retroviral genomes and the annealing of tRNA to the PBS in vitro. However, mature NC is not required for these events in vivo, since protease-deficient viral mutants, in which NC is not cleaved from the parental Gag polyprotein, are known to contain dimeric RNAs with tRNA annealed to the PBS. In the present experiments, we have tested recombinant human immunodeficiency virus type 1 Gag polyprotein for nucleic acid chaperone activity. The protein was positive by all of our assays, including the ability to stimulate dimerization and to anneal tRNA to the PBS in vitro. In quantitative experiments, its activity was approximately equivalent on a molar basis to that of NC. Based on these results, we suggest that the Gag polyprotein (presumably by its NC domain) catalyzes the annealing of tRNA to the PBS during (or before) retrovirus assembly in vivo.
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Affiliation(s)
- Y X Feng
- Retroviral Genetics Section, ABL-Basic Research Program, National Cancer Institute-Frederick Cancer Research and Development Center, Frederick, Maryland 21702, USA
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Feng YX, Copeland TD, Henderson LE, Gorelick RJ, Bosche WJ, Levin JG, Rein A. HIV-1 nucleocapsid protein induces "maturation" of dimeric retroviral RNA in vitro. Proc Natl Acad Sci U S A 1996; 93:7577-81. [PMID: 8755517 PMCID: PMC38788 DOI: 10.1073/pnas.93.15.7577] [Citation(s) in RCA: 150] [Impact Index Per Article: 5.4] [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: 02/02/2023] Open
Abstract
After a retrovirus particle is released from the cell, the dimeric genomic RNA undergoes a change in conformation. We have previously proposed that this change, termed maturation of the dimer, is due to the action of nucleocapsid (NC) protein on the RNA within the virus particle. We now report that treatment of a 345-base synthetic fragment of Harvey sarcoma virus RNA with recombinant or synthetic HIV-1 NC protein converts a less stable form of dimeric RNA to a more stable form. This phenomenon thus appears to reproduce the maturation of dimeric retroviral RNA in a completely defined system in vitro. To our knowledge, maturation of dimeric RNA within a retrovirus particle is the first example of action of an "RNA chaperone" protein in vivo. Studies with mutant NC proteins suggest that the activity depends upon basic amino acid residues flanking the N-terminal zinc finger and upon residues within the N-terminal finger, including an aromatic amino acid, but do not require the zinc finger structures themselves.
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Affiliation(s)
- Y X Feng
- Retroviral Genetics Section, National Cancer Institute-Frederick Cancer Research and Development Center, MD 21702-1201, USA
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Abstract
Retroviruses contain a dimeric RNA consisting of two identical molecules of plus-strand genomic RNA. The structure of the linkage between the two monomers is not known, but they are believed to be joined near their 5' ends. Darlix and coworkers have reported that transcripts of retroviral RNA sequences can dimerize spontaneously in vitro (see, for example, E. Bieth, C. Gabus, and J. L. Darlix, Nucleic Acids Res. 18:119-127, 1990). As one approach to identification of sequences which might participate in the linkage, we have mapped sequences derived from the 5' 378 bases of Harvey sarcoma virus (HaSV) RNA which can dimerize in vitro. We found that at least three distinct regions, consisting of nucleotides 37 to 229, 205 to 272, and 271 to 378, can form these dimers. Two of these regions contain nucleotides 205 to 226; computer analysis suggests that this region can form a stem-loop with an inverted repeat in the loop. We propose that this hypothetical structure is involved in dimer formation by these two transcripts. We also compared the thermal stabilities of each of these dimers with that of HaSV viral RNA. Dimers of nucleotides 37 to 229 and 205 to 272 both exhibited melting temperatures near that of viral RNA, while dimers of nucleotides 271 to 378 are quite unstable. We also found that dimers of nucleotides 37 to 378 formed at 37 degrees C are less thermostable than dimers of the same RNA formed at 55 degrees C. It seems possible that bases from all of these regions participate in the dimer linkage present in viral RNA.
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Affiliation(s)
- Y X Feng
- Laboratory of Molecular Virology and Carcinogenesis, ABL-Basic Research Program, NCI-Frederick Cancer Research and Development Center, Maryland 21702-1201
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Gao GY, Feng YX. [Comparison of morphological and microscopical diagnostic characters of Hawthorn fruits (Crataegus species)]. Yao Xue Xue Bao 1995; 30:781-788. [PMID: 8701734] [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: 05/22/2023]
Abstract
This paper deals with studies on morphological and microscopical diagnostic characters of Chinese Hawthorn fruits. Their similarities and differences in morphological and microscopical characters among eight species of Crataegus (C. pinnatifida Bge., C. pinnatifida var. major NE Br., C. cuneata sieb. & Zuce., C. scabrifolia (Franch.) Rehd., C. hupehensis Sarg., C. kansuensis Wils, C. maximowiczii Schneid. and C. sanguinea Pall.) fruits are compared and illustrated with diagrams.
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Affiliation(s)
- G Y Gao
- Institute of Medicinal Plant Development, Chinese Academy of Medical Science and Peking Union Medical College, Beijing
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Feng YX, Liu F, Bian D, Hu J. [Suppressive effects of adenosine on nonspecific and humoral immunities in mice]. Zhongguo Yao Li Xue Bao 1994; 15:473-6. [PMID: 7717080] [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: 01/26/2023]
Abstract
Adenosine (Ade) 1.3, 13, 130 mg.kg-1 ip inhibited the ability of peripheral leukocytes and peritoneal macrophages in phagocytosing the Staphylococcus albus with [3H]TdR incorporation in mice, declined the hemolytic ability of plaque-forming cells and the production of antibody in mice immunized by sheep erythrocytes. Ade 13, 130 mg.kg-1 ip decreased the mouse serum muramidase (lysozyme) concentration. Dipyridamole (Dip) 10 mg.kg-1 ip attenuated the effects of Ade 130 mg.kg-1 on humoral immunity reaction, but the nonspecific immunity was not attenuated. These results showed that the uptake of Ade may play an important role in the effects of Ade on humoral immunity reaction. Aminophylline (Ami) 100 mg.kg-1 ip attenuated the effects of Ade 130 mg.kg-1 on hemolytic ability of plaque-forming cells and the ability of peripheral leukocytes in phagocytosing Staphylococcus albus. These results suggested that the effects of Ade on murine humoral and nonspecific immunity reaction were mediated by Ade A2 receptor (A2DR).
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Affiliation(s)
- Y X Feng
- Department of Pharmacology, Xinjiang Medical College, Urumqi, China
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14
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Shi XY, Feng YX, Zhao YT. [A clinical and basic study on the relationship between acute myocardial infarction and endothelin]. Zhonghua Nei Ke Za Zhi 1993; 32:384-7. [PMID: 8269770] [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: 01/29/2023]
Abstract
The level of plasma endothelin (ET) was studied in 40 cases with acute myocardial infarction (AMI) with radioimmunoassay. The results showed that plasma ET level reached its peak value (46.01 +/- 1.64 pg/ml) immediately after AMI attack and dropped down (39.37 +/- 0.47 pg/ml) on the first day; The value was still high (15.56 +/- 1.40 pg/ml) on the twenty-eight day: this was significant higher than that in control group (6.35 +/- 0.44 pg/ml, P < 0.001). It was found that height of plasma ET level was closely correlated with severity of myocardial damage and degree of cardiac insufficiency. In order to evaluate the pathogenic role of ET in AMI, the effect of ET-antiserum on myocardial infarction (MI) was investigated on infarct model produced by ligature of left anterior descending coronary artery in rats. The results showed that plasma ET levels elevated significantly in rats with MI (8.4 +/- 1.0, sham 3.1 +/- 0.2 pg/ml, P < 0.01) and ET-antiserum administration dramatically decreased plasma ET level 65% (P < 0.01), lowered plasma content of lipid peroxide 27% (P < 0.01) and reduced infarct size 48% (P < 0.01). It is suggested that ET is an important factor which contributes to the pathogenesis of MI. Limb ischemia and reperfusion study was carried out in rats also. Metallothionein (MT) was found to antagonize markedly ET-induced vasoconstriction and lower the release of ET stimulated by angiotensin II in a dose-dependent manner. It is suggested that under certain pathological conditions MT may exert its injury--resistant and cell protective action.
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Affiliation(s)
- X Y Shi
- Department of Cardialogy, Navy General Hospital
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15
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Han SP, Feng YX. [Constituents in volatile oil of peilan and 3 plants of the same genus]. Zhongguo Zhong Yao Za Zhi 1993; 18:39-41, 63. [PMID: 8323684] [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: 01/29/2023]
Abstract
A study hes been made on the essential oil from the crude drug Peilan (Eupatorium fortunei) and the plants E. japonicum, E. chinense and E. cannabinum. 71 constituents have been identified by GC-MS. Quantitative analysis has been carried out by GC. The study provides scientific methods for the identification of the crude drug "Peilan" and the quality control of the fresh and dried "Peilan".
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Affiliation(s)
- S P Han
- Institute of Medicinal Plant Development, Chinese Academy of Medical Science, Beijing
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16
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Wang YQ, Ye JR, Chen FZ, Fu WG, Yao XL, Feng YX. Surgical treatment of atherosclerotic infrarenal abdominal aortic aneurysms. A review of 30 years' experience. Chin Med J (Engl) 1993; 106:68-72. [PMID: 8504689] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023] Open
Abstract
During the 30 years from 1960 to 1989, 100 sequential patients with atherosclerotic infrarenal abdominal aortic aneurysm (AAA) were admitted to Zhongshan Hospital. Twenty-eight were not treated surgically and 72 underwent resection of the AAA with prosthesis replacement. Nineteen non-surgical patient were followed up, and 8 died from ruptures with a five-year survival rate of 41.3 +/- 13%. In 72 surgically treated patients, the operative mortality was 2.8%. The five-year survival rate is 77.5 +/- 6.2%, which is higher in comparison with the non-surgical group (P < 0.01). The data show that the operation for AAA is safe and the postoperative long-term results are satisfactory.
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Affiliation(s)
- Y Q Wang
- Research Unit of Vascular Surgery, Zhongshan Hospital, Shanghai Medical University
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17
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Feng YX, Yuan H, Rein A, Levin JG. Bipartite signal for read-through suppression in murine leukemia virus mRNA: an eight-nucleotide purine-rich sequence immediately downstream of the gag termination codon followed by an RNA pseudoknot. J Virol 1992; 66:5127-32. [PMID: 1629968 PMCID: PMC241386 DOI: 10.1128/jvi.66.8.5127-5132.1992] [Citation(s) in RCA: 80] [Impact Index Per Article: 2.5] [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: 12/28/2022] Open
Abstract
The pol gene of murine leukemia virus and other mammalian type C retroviruses is expressed by read-through suppression of an in-frame UAG codon which separates the gag and pol coding regions. In this study, we have analyzed the sequence requirements for read-through suppression by placing different portions of wild-type and mutant viral sequences from the gag-pol junction between reporter genes and testing transcripts of these constructs for suppression in reticulocyte lysates. We find that the read-through signal is contained within the first 57 nucleotides on the 3' side of the UAG codon. Our results indicate that the identities of six conserved bases in the eight-nucleotide, purine-rich sequence immediately downstream of the UAG codon are critical for suppression, as is the existence of a pseudoknot structure spanning the next 49 nucleotides. Thus, read-through suppression depends on a complex, bipartite signal in the mRNA.
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MESH Headings
- Animals
- Base Sequence
- Cloning, Molecular
- Codon/genetics
- Fusion Proteins, gag-pol/genetics
- Genes, gag
- Genes, pol
- Molecular Sequence Data
- Moloney murine leukemia virus/genetics
- Mutagenesis, Site-Directed
- Nucleic Acid Conformation
- RNA, Messenger/genetics
- RNA, Viral/genetics
- Reticulocytes/metabolism
- Signal Transduction
- Suppression, Genetic
- Terminator Regions, Genetic
- Transcription, Genetic
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Affiliation(s)
- Y X Feng
- Laboratory of Molecular Virology and Carcinogenesis, NCI-Frederick Cancer Research and Development Center, Maryland 21702
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18
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Feng YX, Copeland TD, Oroszlan S, Rein A, Levin JG. Identification of amino acids inserted during suppression of UAA and UGA termination codons at the gag-pol junction of Moloney murine leukemia virus. Proc Natl Acad Sci U S A 1990; 87:8860-3. [PMID: 2247457 PMCID: PMC55059 DOI: 10.1073/pnas.87.22.8860] [Citation(s) in RCA: 66] [Impact Index Per Article: 1.9] [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: 12/31/2022] Open
Abstract
Expression of the murine leukemia virus pol gene occurs by translational readthrough of an in-frame UAG codon between the gag and pol coding regions. In a previous study, we mutated the UAG codon to UAA or UGA and demonstrated that both of these termination codons could be suppressed in reticulocyte lysates and in infected cells with the same efficiency as UAG. We now report the identity of the amino acids inserted in vitro in response to UAA and UGA in fusion products containing the gag-pol junction region. The results show that UAA, like UAG, directs the incorporation of glutamine, whereas UGA directs the incorporation of three amino acids, arginine, cysteine, and tryptophan. To our knowledge, this is the first report indicating misreading of UAA as glutamine and UGA as arginine and cysteine in higher eukaryotes. Interestingly, although our protein synthesis system presumably contains other known UAG and UGA suppressors, these tRNAs did not suppress the termination codons in our experiments. Thus, it seems possible that the sequence surrounding the gag-pol junction not only promotes suppression but also helps determine which tRNAs function in suppression.
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Affiliation(s)
- Y X Feng
- Laboratory of Molecular Genetics, National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, MD 20892
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19
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Hatfield D, Feng YX, Lee BJ, Rein A, Levin JG, Oroszlan S. Chromatographic analysis of the aminoacyl-tRNAs which are required for translation of codons at and around the ribosomal frameshift sites of HIV, HTLV-1, and BLV. Virology 1989; 173:736-42. [PMID: 2556852 PMCID: PMC7131661 DOI: 10.1016/0042-6822(89)90589-8] [Citation(s) in RCA: 67] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
An examination of the frameshift signals or proposed signals within published sequences of retroviruses and other genetic elements from higher animals shows that each site utilizes a tRNA which normally contains Wybutoxine (Wye) base or Queuine (Q) base in the anticodon loop. We find experimentally that most of the Phe-tRNA present in HIV-1 infected cells lacks the highly modified Wye base in its anticodon loop and most of the Asn-tRNA in HTLV-1 and BLV infected cells lacks the highly modified Q base in its anticodon loop. Interestingly, Phe-tRNA translates a UUU codon within the ribosomal frameshift signal in HIV and Asn-tRNA translates a AAC codon within the proposed frameshift signals in HTLV-1 and BLV. Thus, the lack of a highly modified base in the anticodon loop of tRNAs in retroviral infected cells is correlated with the participation of these undermodified tRNAs in the corresponding frameshift event. This suggests that the "shifty" tRNAs proposed by Jacks et al. (Cell 55, 447-458, 1988) to carry out frameshifting may be hypomodified isoacceptors.
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Affiliation(s)
- D Hatfield
- Laboratory of Experimental Carcinogenesis, National Cancer Institute, Bethesda, Maryland 20892
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20
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Abstract
Genomes of mammalian type C retroviruses contain a UAG termination codon between the gag and pol coding regions. The pol region is expressed in the form of a gag-pol fusion protein following readthrough suppression of the UAG codon. We have used oligonucleotide-directed mutagenesis to change the UAG in Moloney murine leukemia virus to UAA or UGA. These alternate termination codons were also suppressed, both in infected cells and in reticulocyte lysates. Thus, the signal or context inducing suppression of UAG in wild-type Moloney murine leukemia virus is also effective with UAA and UGA. Further, mammalian cells and cell extracts contain tRNAs capable of translating UAA and UGA as amino acids. To our knowledge, this is the first example of natural suppression of UAA in higher eucaryotes.
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Affiliation(s)
- Y X Feng
- Laboratory of Molecular Genetics, National Institute of Child Health and Human Development, Bethesda, Maryland 20892
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21
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Feng YX, Hatfield DL, Rein A, Levin JG. Translational readthrough of the murine leukemia virus gag gene amber codon does not require virus-induced alteration of tRNA. J Virol 1989; 63:2405-10. [PMID: 2784837 PMCID: PMC250668 DOI: 10.1128/jvi.63.5.2405-2410.1989] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.1] [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
An in vitro system to assay translational readthrough of the UAG termination codon at the murine leukemia virus (MuLV) gag-pol junction was developed by using rabbit reticulocyte lysates programmed by SP6-generated Moloney MuLV gag-pol mRNA. Under conditions in which the suppressor activity of the lysate was dependent on addition of tRNA, it could be shown that readthrough synthesis was stimulated to approximately the same extent by equivalent amounts of tRNA from MuLV-infected and uninfected NIH 3T3 cells. Analysis of glutamine tRNA, which mediates suppression in vivo, showed that the level of glutamine acceptor activity and the chromatographic profile of glutamine isoacceptors were unchanged following virus infection. On the basis of these results, we conclude that the suppressor tRNA occurs normally within the tRNA population of uninfected cells and need not be induced in response to virus infection.
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Affiliation(s)
- Y X Feng
- Laboratory of Molecular Genetics, National Institute of Child Health and Human Development, Bethesda, Maryland 20892
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22
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Abstract
Riboflavin deficiency leads to depressed mitochondrial fatty acid oxidation rates but increased activity of carnitine palmitoyltransferase (CPT). Starvation leads to increased CPT activity in ad libitum-fed, riboflavin-supplemented rats. The present studies examined the mechanism of the increase in CPT activity in riboflavin deficiency and whether it was additive to that seen in starvation. Rats were divided into three groups initially: riboflavin-sufficient, ad libitum-fed; riboflavin-deficient, ad libitum-fed; and pair-fed. These groups were subdivided after 5 wk into fed and 24- and 48-h starved groups. When riboflavin-deficient rats were starved for 24 or 48 h, there was only a 30-40% increase in hepatic CPT activity, in contrast to the ad libitum-fed, riboflavin-supplemented rats, in which activity increased twofold. CPT activity of pair-fed rats was similar to that of controls in the fed state and did not increase significantly with starvation. CPT translation, mRNA levels and transcription rates correlated with CPT activity, as did immunoreactive CPT. Concurrently, hepatic ketone production and plasma beta-hydroxybutyrate concentration increased during starvation in the control and pair-fed but not in the riboflavin-deficient rats. The results indicate that increased CPT activity in riboflavin deficiency and starvation results at least in part from increased synthesis. Furthermore, the data support previous work suggesting that the block in fatty acid oxidation occurs in the beta-oxidation pathway at the level of acyl-CoA dehydrogenases.
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Affiliation(s)
- P S Brady
- Department of Food Science and Nutrition, University of Minnesota, St. Paul 55108
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23
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Abstract
A simple and rapid solid-phase RNA sequencing method has been developed based on Peattie's direct chemical method. 3'-Terminally labeled RNA was immobilized on DEAE-cellulose sheets and followed by specific modification with dimethyl sulfate, diethylpyrocarbonate, hydroxylamine (at pH 10 for the uridine and pH 5.5 for the cytidine reaction), and cleavage reaction with aniline. RNA fragments were washed from the DEAE-cellulose sheets using salt solutions, precipitated with ethanol, and separated by 15% polyacrylamide gel electrophoresis. Due to the complete removal of the impurities normally present in the solution method, the higher resolution of the sequencing bands and lower background on the autoradiograph make this solid-phase technique more efficient. This solid-phase technique is much faster and more convenient than the original method.
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Affiliation(s)
- Y Zhang
- Department of Bioscience and Technology, Shanghai Jiao-Tong University, China
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24
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Feng YX, Shi Q, Ye JR. [Autotransplantation of a vein segment with valve in the treatment of deep vein valvular insufficiency of the lower extremity]. Zhonghua Wai Ke Za Zhi 1986; 24:604-5, 638. [PMID: 3829848] [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: 01/07/2023]
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25
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Feng YX, Li JM, Zheng JJ. [Thoraco-abdominal aneurysmectomy using intra-aortic long-balloon occlusion technic]. Zhonghua Wai Ke Za Zhi 1986; 24:321-4, 381. [PMID: 3816426] [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: 01/07/2023]
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26
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Feng YX, Krupp G, Gross JH. Exceptionally high and diverse mutation rates in insects small rRNA. Sci Sin B 1985; 28:1060-3. [PMID: 3837321] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
The nucleotide sequence of 5S rRNA from the posterior silk gland of the silk worm Philosamia cynthia ricini has been determined. The comparison with other insect 5S rRNAs revealed an exceptionally conserved secondary structure, in spite of an extremely high mutation rate: Thirteen nucleotides are different in Philosamia and Drosophila 5S rRNA, but all substitutions are either compensatory or occur in loops or introduce G:U base pairs. The rates of base substitution per site per year of several insect species (diptera and lepidoptera) 5S and 5.8S rRNAs are compared with those occurring in vertebrate rRNAs. In the latter cases the rates are remarkably constant, whereas their value is not only about twofold higher in insect rRNAs, but is found to be extremely large in the 5S rRNA of the silkworm Bombyx mori. These data demonstrate that phylogenetic conclusions derived from small rRNA sequence comparisons are only of limited value.
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27
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Feng YX. [Pharmacognostical identification of 4 species of Saururaceae]. Zhong Yao Tong Bao 1985; 10:10-2. [PMID: 2934150] [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: 01/03/2023]
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28
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Feng YX, Jin XW. [Diagnosis and treatment of polyarteritis]. Zhonghua Wai Ke Za Zhi 1985; 23:138-40, 189. [PMID: 3996110] [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: 01/08/2023]
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29
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Feng YX. [Pharmacognosy study of the Chinese herb drugs bai-jie-teng and hin-bu-huan]. Zhong Yao Tong Bao 1984; 9:11-4. [PMID: 6242104] [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: 01/19/2023]
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30
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Feng YX. [Experience in the treatment of 75 cases of abdominal aortic aneurysm]. Zhonghua Wai Ke Za Zhi 1984; 22:554-7, 574. [PMID: 6532722] [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: 01/20/2023]
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31
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Feng YX. [Axillo-axillary artery bypass in the treatment of subclavian artery syndrome]. Zhonghua Wai Ke Za Zhi 1984; 22:407-9, 445. [PMID: 6518894] [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: 01/20/2023]
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32
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Feng YX. [Vascular pedicled free omental graft in the treatment of thromboangiitis obliterans]. Zhonghua Wai Ke Za Zhi 1984; 22:91-3. [PMID: 6468144] [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: 01/20/2023]
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33
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Feng YX, Zhu ZY, Chen H. [Pharmacognostical study on eighteen medicinal species in genus Stephania]. Yao Xue Xue Bao 1983; 18:849-861. [PMID: 6679978] [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: 05/21/2023]
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34
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Zhu ZY, Feng YX, He LY, Wang YC. [Utilization of medicinal plant resources of the genus Cyclea of Menispermaceae in China]. Yao Xue Xue Bao 1983; 18:535-540. [PMID: 6659958] [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: 05/21/2023]
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35
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Zhu ZY, Feng YX, Ho LY, Wang YC. [Utilization of medicinal plant resources of genus Stephania of Menispermaceae in China]. Yao Xue Xue Bao 1983; 18:460-7. [PMID: 6659945] [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: 01/21/2023]
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36
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Feng YX. [Pharmacognostic studies on 3 types of Plantago seeds]. Zhong Yao Tong Bao 1983; 8:8-12. [PMID: 6224584] [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: 01/19/2023]
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37
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Feng YX, Lin SQ, Zhang XQ. [Botanical and pharmacognostical studies of Chinese Aristolochia: resource utilization]. Yao Xue Xue Bao 1983; 18:291-8. [PMID: 6624474] [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: 01/21/2023]
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38
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39
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Feng YX, Krupp G, Gross HJ. The nucleotide sequence of 5.8S rRNA from the posterior silk gland of the silkworm Philosamia cynthia ricini. Nucleic Acids Res 1982; 10:6383-7. [PMID: 7177850 PMCID: PMC326927 DOI: 10.1093/nar/10.20.6383] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023] Open
Abstract
The nucleotide sequence of 5.8S rRNA from the Chinese silkworm Philosamia cynthia ricini has been determined by gel sequencing and mobility shift methods. The complete primary structure is (sequence in text). This is one of the largest known 5.8S rRNAs. As compared to Bombyx 5.8S rRNA, it is two nucleotides longer; two nucleotides near the 5'end and two nucleotides near the 3'end are different, and psi 61 of the Bombyx RNA sequence is an unmodified U in Philosamia RNA. The secondary structure of Philosamia 5.8S rRNA may differ from the Bombyx RNA structure by three additional base pairs at the 5'/3' ends.
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40
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Feng YX, Zheng JJ, Li JM, Shi Q. Clinical application of pure silk vascular prostheses. Chin Med J (Engl) 1982; 95:565-8. [PMID: 6814857] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023] Open
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41
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Feng YX, Lin SQ, Lou ZQ. [Morphological and histological differences of eighteen medicinal Aristolochia roots and rhizomes]. Yao Xue Xue Bao 1982; 17:521-33. [PMID: 7180484] [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: 01/23/2023]
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42
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Feng YX. [Surgical treatment of mycotic aneurysm]. Zhonghua Wai Ke Za Zhi 1982; 20:358-60. [PMID: 6897031] [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: 01/22/2023]
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43
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Feng YX, Shi Q. Surgical treatment of carotid body tumors. Review of 63 cases. Chin Med J (Engl) 1982; 95:417-22. [PMID: 6813049] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023] Open
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44
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Feng YX, Wu ZH. Surgical treatment of atypical coarctation of the thoracoabdominal aorta. Chin Med J (Engl) 1982; 95:129-35. [PMID: 6807615] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023] Open
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45
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Wu ZH, Li JM, Feng YX. Polyarteritis: clinical analysis of 100 cases. Chin Med J (Engl) 1982; 95:67-70. [PMID: 6121687] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023] Open
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46
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Feng YX. [Axillofemoral bypass for treatment of Leriche syndrome (author's transl)]. Zhonghua Wai Ke Za Zhi 1981; 19:648-51. [PMID: 7341136] [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: 01/24/2023]
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47
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Feng YX, Wang YP, Lou ZC. [Pharmacognostical study on several Rauvolfia roots and their adulterants (author's transl)]. Yao Xue Xue Bao 1981; 16:45-52. [PMID: 7246154] [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: 05/21/2023]
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48
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Feng YX, Shi Q. [Surgical treatment of aneurysms of extracranial carotid artery (author's transl)]. Zhonghua Wai Ke Za Zhi 1981; 19:32-5. [PMID: 7307839] [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: 01/24/2023]
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49
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Feng YX. [Surgical treatment of thoraco-abdominal stenosing aorto-arteritis (author's transl)]. Zhonghua Xin Xue Guan Bing Za Zhi 1980; 8:185-8. [PMID: 7307942] [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: 01/24/2023]
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50
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Feng YX. [Surgical treatment of thoraco-abdominal - aortic aneurysms: report of two successful cases (author's transl)]. Zhonghua Wai Ke Za Zhi 1980; 18:29-32. [PMID: 7011708] [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: 01/23/2023]
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