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Ling XD, Dong WT, Zhang Y, Hu JJ, Zhang WD, Wu JT, Liu JX, Zhao XX. Baculoviral infection reduces the expression of four allergen proteins of silkworm pupa. ARCHIVES OF INSECT BIOCHEMISTRY AND PHYSIOLOGY 2019; 100:e21539. [PMID: 30790339 DOI: 10.1002/arch.21539] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/10/2018] [Revised: 01/04/2019] [Accepted: 02/05/2019] [Indexed: 06/09/2023]
Abstract
Silkworm (Bombyx mori) larvae are widely used to express exogenous proteins. Moreover, some silkworm pupal proteins can be used as drug-loading materials for selfexpressed oral tolerance drugs. However, several proteins expressed in silkworm pupae cause severe allergic reactions in humans and animals. Interestingly, some baculovirus vectors have been shown to alter the host gene and its expression in insect cells, but this has not been confirmed in silkworm. Here, we analyzed the effects of infection with an empty B. mori baculovirus (BmNPV) vector on silkworm pupal protein expression. Using a proteomics approach, the allergens thiol peroxiredoxin (Jafrac1), 27-kDa glycoprotein (p27k), arginine kinase, and paramyosin as well as 32 additional differentially expressed proteins were identified. Downregulation of the messenger RNA expression of the four known allergens was observed after BmNPV infection; subsequent changes in protein expression were confirmed by the western blot analysis using polyclonal antibodies prepared with recombinant proteins of the four allergens. Collectively, these data indicate that the four known allergens of silkworm pupae can be reduced by infection ith an empty BmNPV vector to increase the safety of silkworm pupa-based exogenous protein expression and drug delivery of oral pharmaceuticals. In addition, the four recombinant allergen proteins may contribute to the diagnosis of allergic diseases of silkworm pupa.
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Affiliation(s)
- Xiao-Dong Ling
- Department of Clinical Veterinary, College of Veterinary Medicine, Gansu Agricultural University, Lanzhou, Gansu, China
| | - Wei-Tao Dong
- Department of Clinical Veterinary, College of Veterinary Medicine, Gansu Agricultural University, Lanzhou, Gansu, China
| | - Yong Zhang
- Department of Clinical Veterinary, College of Veterinary Medicine, Gansu Agricultural University, Lanzhou, Gansu, China
| | - Jun-Jie Hu
- Department of Clinical Veterinary, College of Veterinary Medicine, Gansu Agricultural University, Lanzhou, Gansu, China
| | - Wang-Dong Zhang
- Department of Clinical Veterinary, College of Veterinary Medicine, Gansu Agricultural University, Lanzhou, Gansu, China
| | - Jin-Tang Wu
- Product R&D, Lanzhou Weitesen Biological Technology Co. Ltd., Lanzhou, China
| | - Ji-Xing Liu
- Product R&D, Lanzhou Weitesen Biological Technology Co. Ltd., Lanzhou, China
| | - Xing-Xu Zhao
- Department of Clinical Veterinary, College of Veterinary Medicine, Gansu Agricultural University, Lanzhou, Gansu, China
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Oral Administration of Silkworm-Produced GAD65 and Insulin Bi-Autoantigens against Type 1 Diabetes. PLoS One 2016; 11:e0147260. [PMID: 26783749 PMCID: PMC4718521 DOI: 10.1371/journal.pone.0147260] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2015] [Accepted: 01/02/2016] [Indexed: 01/27/2023] Open
Abstract
Induction of mucosal tolerance by oral administration of protein antigens is a potential therapeutic strategy for preventing and treating type 1 diabetes (T1D); however, the requirement for a large dosage of protein limits clinical applications because of the low efficacy. In this study, we generated a fusion protein CTB-Ins-GAD composed of CTB (cholera toxin B subunit), insulin, and three copies of GAD65 peptide 531–545, which were efficiently produced in silkworm pupae, to evaluate its protective effect against T1D. We demonstrate that oral administration of CTB-Ins-GAD suppressed T1D by up to 78%, which is much more effective than GAD65 single-antigen treatment. Strikingly, CTB-Ins-GAD enhance insulin- and GAD65-specific Th2-like immune responses, which repairs the Th1/Th2 imbalance and increases the number of CD4+CD25+Foxp3+ T cell and suppresses insulin- and GAD65-reactive spleen T lymphocyte proliferation and migration. Our results strongly suggest that the combined dual antigens promote the induction of oral tolerance, thus providing an effective and economic immunotherapy against T1D in combination with a silkworm bioreactor.
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Zhang W, Wang J, Zhang C, Fang Q, Shu J, Li S, Jin J, Wang D, Nie Z, Lv Z, Zhang Y. Synergetic Protein Factors That Improve rhGM-CSF Absorption via an Oral Route Exist in Silkworm Pupae. Mol Pharm 2015; 12:1347-55. [PMID: 25775407 DOI: 10.1021/mp500371g] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Recent studies have demonstrated that recombinant human granulocyte macrophage colony-stimulating factor (rhGM-CSF) produced by the silkworm pupae bioreactor is absorbed into blood through oral administration and functions as an active cytokine. The aim of this study was to further examine and identify synergetic protein factors in silkworm pupae that improve rhGM-CSF absorption via an oral route. The concentrations of rhGM-CSF in serum were evaluated in mice after oral administration of rhGM-CSF using different chemical compositions of silkworm pupae as pharmaceutical excipients. The experimental data revealed that the supernatant lyophilized powder (SLP) of a homogenized slurry of silkworm pupae caused a significant increase in the rhGM-CSF level in blood when rhGM-CSF was orally administered with SLP, suggesting that synergetic protein factors that improve the oral absorption of rhGM-CSF primarily exist in SLP. As shown by scanning electron microscopy, microspheres were formed when rhGM-CSF was coated with SLP. Animal experimental data showed that the absorption of orally administered rhGM-CSF through the gastrointestinal (GI) tract primarily resulted from protein factors present in the SLP retentate obtained after 10 kDa ultrafiltration. Surface plasmon resonance spectroscopy analysis demonstrated that several protein factors present in the SLP retentate obtained after 10 kDa ultrafiltration were bound to rhGM-CSF. Proteins bound to rhGM-CSF by liquid chromatography-mass spectrometry were identified as chymotrypsin inhibitor SCI-II precursor, cationic peptide CP8 precursor, Kazal-type proteinase inhibitor, and chymotrypsin inhibitor SCI-I. These findings indicate that these proteinase inhibitors play an important role in improving rhGM-CSF absorption in the GI tract.
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Affiliation(s)
- Wenping Zhang
- Institute of Biochemistry, College of Life Science, Zhejiang Sci-Tech University, Hangzhou 310018, China
| | - Jian Wang
- Institute of Biochemistry, College of Life Science, Zhejiang Sci-Tech University, Hangzhou 310018, China
| | - Chen Zhang
- Institute of Biochemistry, College of Life Science, Zhejiang Sci-Tech University, Hangzhou 310018, China
| | - Qiang Fang
- Institute of Biochemistry, College of Life Science, Zhejiang Sci-Tech University, Hangzhou 310018, China
| | - Jianhong Shu
- Institute of Biochemistry, College of Life Science, Zhejiang Sci-Tech University, Hangzhou 310018, China
| | - Si Li
- Institute of Biochemistry, College of Life Science, Zhejiang Sci-Tech University, Hangzhou 310018, China
| | - Jia Jin
- Institute of Biochemistry, College of Life Science, Zhejiang Sci-Tech University, Hangzhou 310018, China
| | - Dan Wang
- Institute of Biochemistry, College of Life Science, Zhejiang Sci-Tech University, Hangzhou 310018, China
| | - Zuoming Nie
- Institute of Biochemistry, College of Life Science, Zhejiang Sci-Tech University, Hangzhou 310018, China
| | - Zhengbing Lv
- Institute of Biochemistry, College of Life Science, Zhejiang Sci-Tech University, Hangzhou 310018, China
| | - Yaozhou Zhang
- Institute of Biochemistry, College of Life Science, Zhejiang Sci-Tech University, Hangzhou 310018, China
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Protective effect of the silkworm protein 30Kc6 on human vascular endothelial cells damaged by oxidized low density lipoprotein (Ox-LDL). PLoS One 2013; 8:e68746. [PMID: 23840859 PMCID: PMC3695901 DOI: 10.1371/journal.pone.0068746] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2012] [Accepted: 05/31/2013] [Indexed: 11/19/2022] Open
Abstract
Although the 30K family proteins are important anti-apoptotic molecules in silkworm hemolymph, the underlying mechanism remains to be investigated. This is especially the case in human vascular endothelial cells (HUVECs). In this study, a 30K protein, 30Kc6, was successfully expressed and purified using the Bac-to-Bac baculovirus expression system in silkworm cells. Furthermore, the 30Kc6 expressed in Escherichia coli was used to generate a polyclonal antibody. Western blot analysis revealed that the antibody could react specifically with the purified 30Kc6 expressed in silkworm cells. The In vitro cell apoptosis model of HUVEC that was induced by oxidized low density lipoprotein (Ox-LDL) and in vivo atherosclerosis rabbit model were constructed and were employed to analyze the protective effects of the silkworm protein 30Kc6 on these models. The results demonstrated that the silkworm protein 30Kc6 significantly enhanced the cell viability in HUVEC cells treated with Ox-LDL, decreased the degree of DNA fragmentation and markedly reduced the level of 8-isoprostane. This could be indicative of the silkworm protein 30Kc6 antagonizing the Ox-LDL-induced cell apoptosis by inhibiting the intracellular reactive oxygen species (ROS) generation. Furthermore, Ox-LDL activated the cell mitogen activated protein kinases (MAPK), especially JNK and p38. As demonstrated with Western analysis, 30Kc6 inhibited Ox-LDL-induced cell apoptosis in HUVEC cells by preventing the MAPK signaling pathways. In vivo data have demonstrated that oral feeding of the silkworm protein 30Kc6 dramatically improved the conditions of the atherosclerotic rabbits by decreasing serum levels of total triglyceride (TG), high density lipoprotein cholesterol (HDL-C), low density lipoprotein cholesterol (LDL-C) and total cholesterol (TC). Furthermore, 30Kc6 alleviated the extent of lesions in aorta and liver in the atherosclerotic rabbits. These data are not only helpful in understanding the anti-apoptotic mechanism of the 30K family proteins, but also provide important information on prevention and treatment of human cardiovascular diseases.
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Liu Y, Chen Y, Chen J, Zhang W, Sheng Q, Chen J, Yu W, Nie Z, Zhang Y, Wu W, Wang L, Indran IR, Li J, Qian L, Lv Z. A shark liver gene-derived active peptide expressed in the silkworm, Bombyx mori: preliminary studies for oral administration of the recombinant protein. Mar Drugs 2013; 11:1492-505. [PMID: 23652883 PMCID: PMC3707157 DOI: 10.3390/md11051492] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2013] [Revised: 04/26/2013] [Accepted: 04/28/2013] [Indexed: 11/16/2022] Open
Abstract
Active peptide from shark liver (APSL) is a cytokine from Chiloscyllium plagiosum that can stimulate liver regeneration and protects the pancreas. To study the effect of orally administered recombinant APSL (rAPSL) on an animal model of type 2 diabetes mellitus, the APSL gene was cloned, and APSL was expressed in Bombyx mori N cells (BmN cells), silkworm larvae and silkworm pupae using the silkworm baculovirus expression vector system (BEVS). It was demonstrated that rAPSL was able to significantly reduce the blood glucose level in mice with type 2 diabetes induced by streptozotocin. The analysis of paraffin sections of mouse pancreatic tissues revealed that rAPSL could effectively protect mouse islets from streptozotocin-induced lesions. Compared with the powder prepared from normal silkworm pupae, the powder prepared from pupae expressing rAPSL exhibited greater protective effects, and these results suggest that rAPSL has potential uses as an oral drug for the treatment of diabetes mellitus in the future.
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Affiliation(s)
- Yunlong Liu
- Zhejiang Provincial Key Laboratory of Silkworm Bioreactor and Biomedicine, Institute of Biochemistry, Zhejiang Sci-Tech University, Hangzhou 310018, China; E-Mails: (Y.L.); (Y.C.); (J.C.); (W.Z.); (Q.S.); (J.C.); (W.Y.); (Z.N.); (Y.Z.); (W.W.)
| | - Ying Chen
- Zhejiang Provincial Key Laboratory of Silkworm Bioreactor and Biomedicine, Institute of Biochemistry, Zhejiang Sci-Tech University, Hangzhou 310018, China; E-Mails: (Y.L.); (Y.C.); (J.C.); (W.Z.); (Q.S.); (J.C.); (W.Y.); (Z.N.); (Y.Z.); (W.W.)
| | - Jianqing Chen
- Zhejiang Provincial Key Laboratory of Silkworm Bioreactor and Biomedicine, Institute of Biochemistry, Zhejiang Sci-Tech University, Hangzhou 310018, China; E-Mails: (Y.L.); (Y.C.); (J.C.); (W.Z.); (Q.S.); (J.C.); (W.Y.); (Z.N.); (Y.Z.); (W.W.)
| | - Wenping Zhang
- Zhejiang Provincial Key Laboratory of Silkworm Bioreactor and Biomedicine, Institute of Biochemistry, Zhejiang Sci-Tech University, Hangzhou 310018, China; E-Mails: (Y.L.); (Y.C.); (J.C.); (W.Z.); (Q.S.); (J.C.); (W.Y.); (Z.N.); (Y.Z.); (W.W.)
| | - Qing Sheng
- Zhejiang Provincial Key Laboratory of Silkworm Bioreactor and Biomedicine, Institute of Biochemistry, Zhejiang Sci-Tech University, Hangzhou 310018, China; E-Mails: (Y.L.); (Y.C.); (J.C.); (W.Z.); (Q.S.); (J.C.); (W.Y.); (Z.N.); (Y.Z.); (W.W.)
| | - Jian Chen
- Zhejiang Provincial Key Laboratory of Silkworm Bioreactor and Biomedicine, Institute of Biochemistry, Zhejiang Sci-Tech University, Hangzhou 310018, China; E-Mails: (Y.L.); (Y.C.); (J.C.); (W.Z.); (Q.S.); (J.C.); (W.Y.); (Z.N.); (Y.Z.); (W.W.)
| | - Wei Yu
- Zhejiang Provincial Key Laboratory of Silkworm Bioreactor and Biomedicine, Institute of Biochemistry, Zhejiang Sci-Tech University, Hangzhou 310018, China; E-Mails: (Y.L.); (Y.C.); (J.C.); (W.Z.); (Q.S.); (J.C.); (W.Y.); (Z.N.); (Y.Z.); (W.W.)
| | - Zuoming Nie
- Zhejiang Provincial Key Laboratory of Silkworm Bioreactor and Biomedicine, Institute of Biochemistry, Zhejiang Sci-Tech University, Hangzhou 310018, China; E-Mails: (Y.L.); (Y.C.); (J.C.); (W.Z.); (Q.S.); (J.C.); (W.Y.); (Z.N.); (Y.Z.); (W.W.)
| | - Yaozhou Zhang
- Zhejiang Provincial Key Laboratory of Silkworm Bioreactor and Biomedicine, Institute of Biochemistry, Zhejiang Sci-Tech University, Hangzhou 310018, China; E-Mails: (Y.L.); (Y.C.); (J.C.); (W.Z.); (Q.S.); (J.C.); (W.Y.); (Z.N.); (Y.Z.); (W.W.)
| | - Wutong Wu
- Zhejiang Provincial Key Laboratory of Silkworm Bioreactor and Biomedicine, Institute of Biochemistry, Zhejiang Sci-Tech University, Hangzhou 310018, China; E-Mails: (Y.L.); (Y.C.); (J.C.); (W.Z.); (Q.S.); (J.C.); (W.Y.); (Z.N.); (Y.Z.); (W.W.)
| | - Lisha Wang
- School of Pharmacy, Xuzhou Medical College, Xuzhou 221004, China; E-Mail:
| | - Inthrani Raja Indran
- Department of Obstetrics & Gynaecology, Yong Loo Lin School of Medicine, National University Health System, Singapore 119228, Singapore; E-Mails: (I.R.I.); (J.L.)
| | - Jun Li
- Department of Obstetrics & Gynaecology, Yong Loo Lin School of Medicine, National University Health System, Singapore 119228, Singapore; E-Mails: (I.R.I.); (J.L.)
| | - Lian Qian
- Agilent Technologies Singapore Pte Ltd., Singapore 117681, Singapore; E-Mail:
| | - Zhengbing Lv
- Zhejiang Provincial Key Laboratory of Silkworm Bioreactor and Biomedicine, Institute of Biochemistry, Zhejiang Sci-Tech University, Hangzhou 310018, China; E-Mails: (Y.L.); (Y.C.); (J.C.); (W.Z.); (Q.S.); (J.C.); (W.Y.); (Z.N.); (Y.Z.); (W.W.)
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Yang L, Lu X, Liu Y, Lv Z, Chen J, Yu W, Zhang Y, Nie Z. Expression analysis of miRNAs in BmN cells. Gene 2012; 505:240-5. [PMID: 22713175 DOI: 10.1016/j.gene.2012.06.018] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2012] [Revised: 06/09/2012] [Accepted: 06/11/2012] [Indexed: 10/28/2022]
Abstract
MicroRNAs (miRNAs) are the family of noncoding single-strand RNA molecules of 21-25 nucleotides in length and play a broad and key regulation role in various physiological and pathological processes including differentiation, apoptosis, proliferation, and tumorigenesis. In Bombyx mori, a total of 487 pre-miRNAs and 562 mature miRNAs were identified by experimental or computational approaches, but their functions remain unknown. To carry out the research of gain-of-function of miRNAs in BmN cells, we firstly identified the endogenous expression of miRNAs in BmN cells by microarray and found that only 73 miRNAs could be detected by miRNA microarray. Then three low abundance or undetected miRNAs, pri-mir-1a, pri-mir-8 and pri-mir-133, were selected to express in BmN cells. The eukaryotic expression vector pIEx-1 harboring baculovirus ie1 promoter and hr5 enhancer was screened and used for expressing miRNA in BmN cells. Three miRNA expression vectors pIEx-1-EGFP-pri-mir-1a/8/133 were constructed, which contained the three corresponding pri-miRNA sequences, respectively. The constructed miRNA vectors were successfully transfected into BmN cells and the qRT-PCR analysis showed that relative abundance of bmo-mir-1a, bmo-mir-8 and bmo-mir-133 in BmN cells transfected with the pIEx-1-EGFP-pri-mir-1a/8/133 is as 32, 4.4 and 904 times as that in BmN cells transfected with the control vector pIEx-1-EGFP, respectively. The present work lays a foundation for the further functional studies of miRNAs in silkworm.
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Affiliation(s)
- Lancui Yang
- Institute of Biochemistry, Zhejiang Sci-Tech University, Hangzhou 310018, China
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Protection against autoimmune diabetes by silkworm-produced GFP-tagged CTB-insulin fusion protein. Clin Dev Immunol 2011; 2011:831704. [PMID: 21765853 PMCID: PMC3135140 DOI: 10.1155/2011/831704] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2011] [Revised: 04/15/2011] [Accepted: 04/30/2011] [Indexed: 01/09/2023]
Abstract
In animals, oral administration of the cholera toxin B (CTB) subunit conjugated to the autoantigen insulin enhances the specific immune-unresponsive state. This is called oral tolerance and is capable of suppressing autoimmune type 1 diabetes (T1D). However, the process by which the CTB-insulin (CTB-INS) protein works as a therapy for T1D in vivo remains unclear. Here, we successfully expressed a green fluorescent protein- (GFP-) tagged CTB-Ins (CTB-Ins-GFP) fusion protein in silkworms in a pentameric form that retained the native ability to activate the mechanism. Oral administration of the CTB-Ins-GFP protein induced special tolerance, delayed the development of diabetic symptoms, and suppressed T1D onset in nonobese diabetic (NOD) mice. Moreover, it increased the numbers of CD4+CD25+Foxp3+ T regulatory (Treg) cells in peripheral lymph tissues and affected the biological activity of spleen cells. This study demonstrated that the CTB-Ins-GFP protein produced in silkworms acted as an oral protein vaccine, inducing immunological tolerance involving CD4+CD25+Foxp3+ Treg cells in treating T1D.
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Xue R, Chen H, Cui L, Cao G, Zhou W, Zheng X, Gong C. Expression of hGM-CSF in silk glands of transgenic silkworms using gene targeting vector. Transgenic Res 2011; 21:101-11. [PMID: 21533901 DOI: 10.1007/s11248-011-9513-y] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2010] [Accepted: 04/12/2011] [Indexed: 12/23/2022]
Abstract
The silk gland of the silkworm is a highly specialized organ that has the wonderful ability to synthesize and secrete silk protein. To express human granucyto-macrophage colony-stimulating factor (hGM-CSF) in the posterior silk glands of gene-targeted silkworms, a targeting vector pSK-FibL-L-A3GFP-PH-GMCSF-LPA-FibL-R was constructed, harboring a 1.2 kb portion of the left homogenous arm (FibL-L), a 0.5 kb portion of the right homogenous arm (FibL-R), fibroin H-chain-promoter-driven hGM-CSF and silkworm actin 3-promoter-driven gfp. The targeting vector was then introduced into the eggs of silkworm, and the transgenic silkworms were verified by PCR and DNA hybridization after being screened for the gfp gene. Western blotting analysis using an antibody against hGM-CSF demonstrated a specific band with a molecular weight of 22 kD in the silk glands of the G3 generation transgenic silkworms. The level of expression of hGM-CSF in the posterior silk glands of the G3 generation transgenic silkworms was approximately 2.70 ng/g of freeze-dried powdered posterior silk gland. These results showed that the heterologous gene could be introduced into the silkworm genome and expressed successfully. Further more, the exogenous genes existing in the G5 transgenic silkworm identified by PCR confirmed its integration stability. In addition, the silk glands containing expressed hGM-CSF performed the function of significantly increasing leukocyte count of CY-treated mice in a time-and-dose-dependent manner.
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Affiliation(s)
- Renyu Xue
- Pre-Clinical Medical and Biological Science College, Soochow University, Suzhou, 215123, China
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In vivo bioassay of recombinant human growth hormone synthesized in B. mori pupae. J Biomed Biotechnol 2010; 2010:306462. [PMID: 20339512 PMCID: PMC2842897 DOI: 10.1155/2010/306462] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2009] [Revised: 12/13/2009] [Accepted: 01/15/2010] [Indexed: 11/17/2022] Open
Abstract
The human growth hormone (hGH) has been expressed in prokaryotic expression system with low bioactivity previously. Then the effective B. mori baculovirus system was employed to express hGH identical to mature hGH successfully in larvae, but the expression level was still limited. In this work, the hGH was expressed in B. mori pupae by baculovirus system. Quantification of recombinant hGH protein (BmrhGH) showed that the expression of BmrhGH reached the level of approximately 890 microg/mL pupae supernatant solution, which was five times more than the level using larvae. Furthermore, Animals were gavaged with BmrhGH at the dose of 4.5 mg/rat.day, and the body weight gain (BWG) of treated group had a significant difference (P < .01) compared with the control group. The other two parameters of liver weight and epiphyseal width were also found to be different between the two groups (P < .05). The results suggested that BmrhGH might be used as a protein drug by oral administration.
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Li Y, Cao G, Chen H, Jia H, Xue R, Gong C. Expression of the hGM-CSF in the silk glands of germline of gene-targeted silkworm. Biochem Biophys Res Commun 2009; 391:1427-31. [PMID: 20026302 DOI: 10.1016/j.bbrc.2009.12.082] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2009] [Accepted: 12/11/2009] [Indexed: 01/30/2023]
Abstract
To express human granulocyte-macrophage colony-stimulating factor (hGM-CSF) gene in the silk glands of transformation silkworm (Bombyx mori) based on gene-targeting, two fragments from fibroin heavy chain gene (fib-H) of silkworm were cloned and sequenced. One fragment contains the 1st exon and its downstream 1st intron's partial sequence; and the other fragment contains the 1st intron's partial sequence and the 2nd exon's partial sequence. Then the two fragments, as homologous arm, were inserted into pSK to generate a gene-targeted vector, pSK-HL-A3GFP-FLP-GM-CSF-FLPA-HR in which a gfp gene driven by A3 promoter and an hGM-CSF gene under the control of fibroin light chain (fib-L) promoter were included. The vector was transferred into the silkworm eggs using sperm-mediated gene transfer. After being screened for green fluorescent, the transformation silkworm was obtained, whose genome was verified by PCR and dot hybridization to confirm whether the target genes had been integrated into the silkworm genome. Furthermore, in the posterior silk glands of the G4 generation transformation silkworms, a specific band with the molecular weight of 22kDa could be detected by Western blotting with an antibody against hGM-CSF, and the expression level of the hGM-CSF estimated by ELISA was approximately 1.26ng per gram fresh posterior silk gland.
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Affiliation(s)
- Yanmei Li
- Pre-Clinical Medical and Biological Science College, Soochow University, Suzhou 215123, PR China.
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