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Yao YY, Zhang QS, Liu SB, Yang HW, Chen XY, Yang YL, Gao CC, Ran C, Teame T, Zhang Z, Zhou ZG. Pichia pastoris composition expressed aerolysin mutant of Aeromonas veronii as an oral vaccine evaluated in zebrafish ( Danio rerio). MARINE LIFE SCIENCE & TECHNOLOGY 2024; 6:475-487. [PMID: 39219683 PMCID: PMC11358560 DOI: 10.1007/s42995-024-00239-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/09/2023] [Accepted: 05/07/2024] [Indexed: 09/04/2024]
Abstract
Vaccines are one of the most practical means to stop the spreading of Aeromonas veronii in aquaculture. In this study, virulence factor aerolysin mutant NTaer which has lost its hemolytic activity was used as a target antigen. Pichia pastoris constitutive secretory expression NTaer (GS115-NTaer) was used as a potential safe oral vaccine to evaluate its effectiveness on zebrafish immunity. The result shows that vaccination of GS115- NTaer for four weeks did not affect the growth performance of the host, while eliciting an effective immune protective response. Compared with the control group, the GS115-NTaer could significantly up-regulate the relative expression level of the intestinal tight junction protein 1α (TJP1α) gene, and significantly increased the contents of lysozyme (LYZ), complement C3 and C4 in the gut, indicating that the innate immune response of the fish was activated. The relative gene expression levels of macrophage-expressed gene 1 (MPEG1) and T cell receptor (TCR-α) in the gut, and MPEG1, CD4, CD8, TCR-α, GATA3, and T-bet in the spleen were all increased significantly, indicating that the cellular immune response of the fish was activated. Furthermore, the contents of serum IgM and intestinal mucosa IgZ antibodies were significantly increased, which showed that humoral immunity was also activated. Moreover, inoculation with GS115-NTaer significantly changed the structure of gut microbiota. In particular, the relative ratio of (Firmicutes + Fusobacteriota + Bacteroidota)/Proteobacteria was significantly higher than that of the control and GS115 groups. Lastly, the vaccinated fish were challenged with A. veronii, and the relative percent survival of GS115 and the GS115-NTear groups was 14.28% and 33.43%. This improvement of immunity was not only due to the specific immune response but also attributed to the improvement of innate immunity and the gut microbiota which was demonstrated by the germ-free zebrafish model. Collectively, this study provides information on the effectiveness of GS115-NTear as an oral vaccine for the green prevention and control of A. veronii infection in fish aquaculture.
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Affiliation(s)
- Yuan-Yuan Yao
- Key Laboratory for Feed Biotechnology of the Ministry of Agriculture, Institute of Feed Research of Chinese Academy of Agricultural Sciences, Beijing, 100081 China
| | - Qing-Shuang Zhang
- Sino-Norway Fish Gastrointestinal Microbiota Joint Lab, Institute of Feed Research of Chinese Academy of Agricultural Sciences, Beijing, 100081 China
| | - Shu-Bin Liu
- Sino-Norway Fish Gastrointestinal Microbiota Joint Lab, Institute of Feed Research of Chinese Academy of Agricultural Sciences, Beijing, 100081 China
| | - Hong-Wei Yang
- Sino-Norway Fish Gastrointestinal Microbiota Joint Lab, Institute of Feed Research of Chinese Academy of Agricultural Sciences, Beijing, 100081 China
- Institute of Marine Sciences, Shantou University, Shantou, 515063 China
| | - Xing-Yu Chen
- Sino-Norway Fish Gastrointestinal Microbiota Joint Lab, Institute of Feed Research of Chinese Academy of Agricultural Sciences, Beijing, 100081 China
| | - Ya-Lin Yang
- Key Laboratory for Feed Biotechnology of the Ministry of Agriculture, Institute of Feed Research of Chinese Academy of Agricultural Sciences, Beijing, 100081 China
| | - Chen-Chen Gao
- Sino-Norway Fish Gastrointestinal Microbiota Joint Lab, Institute of Feed Research of Chinese Academy of Agricultural Sciences, Beijing, 100081 China
| | - Chao Ran
- Key Laboratory for Feed Biotechnology of the Ministry of Agriculture, Institute of Feed Research of Chinese Academy of Agricultural Sciences, Beijing, 100081 China
| | - Tsegay Teame
- Sino-Norway Fish Gastrointestinal Microbiota Joint Lab, Institute of Feed Research of Chinese Academy of Agricultural Sciences, Beijing, 100081 China
- Tigray Agricultural Research Institute (TARI) Mekelle Center, Tigray, 7101 Ethiopia
| | - Zhen Zhang
- Key Laboratory for Feed Biotechnology of the Ministry of Agriculture, Institute of Feed Research of Chinese Academy of Agricultural Sciences, Beijing, 100081 China
| | - Zhi-Gang Zhou
- Sino-Norway Fish Gastrointestinal Microbiota Joint Lab, Institute of Feed Research of Chinese Academy of Agricultural Sciences, Beijing, 100081 China
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Budi DS, Puspitasari S, Febrianti RPN, Bodur T, Mukti AT. A novel technique for mass induction of propagation in small fish species: Hormone immersion. Anim Reprod Sci 2023; 255:107280. [PMID: 37343462 DOI: 10.1016/j.anireprosci.2023.107280] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2023] [Revised: 06/13/2023] [Accepted: 06/14/2023] [Indexed: 06/23/2023]
Abstract
Due to the lack of environmental stimuli found in their natural habitat, not all species of tiny fish can reproduce naturally in the conditions of captivity. Silver rasbora (Rasbora argyrotaenia) was used as the model organism in this study, which is the first to successfully use the hormonal technique of immersion to mass induce spawning and spermiation in small fish species. In this study, in order to find out the effect of immersion hormone treatment, two separate experiments in which commercial hormone Ovaprim™ was used for spawning induction and Ovagold™ for spermiation induction were conducted. Four doses of hormones (0.0 mL/L, 0.7 mL/L, 1.4 mL/L, and 2.1 mL/L) were evaluated on 24 females and 40 males in total. According to the experimental findings of female breeders, 1.4 mL/L dose of Ovaprim™ showed best results on latency period (8.67 h) with a total number of eggs (6994 egg) and fertilization rate (99.22 %). In addition, hatching and larval survival rate have also increased. Milt volume and sperm concentration have also seen an increase to 4.25 μL/g bw and 42.71 106 cell/μL respectively at 2.1 mL/L hormone concentration. The best results or responses were obtained by immersion treatments using Ovaprim™ doses of 1.4 mL/L on female and Ovagold™ concentrations of 2.1 mL/L on male. This new technique is a beneficial for breeding small fish species for either commercial or conservational culture condition.
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Affiliation(s)
- Darmawan Setia Budi
- Study Program of Aquaculture, Department of Health and Life Sciences, School of Health and Life Sciences, Universitas Airlangga, Banyuwangi, Indonesia.
| | - Sherly Puspitasari
- Study Program of Aquaculture, Department of Health and Life Sciences, School of Health and Life Sciences, Universitas Airlangga, Banyuwangi, Indonesia
| | - Rahma Putri Nuramalia Febrianti
- Study Program of Aquaculture, Department of Health and Life Sciences, School of Health and Life Sciences, Universitas Airlangga, Banyuwangi, Indonesia
| | - Türker Bodur
- Department of Aquaculture, Faculty of Fisheries, Akdeniz University, Antalya, Turkiye
| | - Akhmad Taufiq Mukti
- Department of Aquaculture, Faculty of Fisheries and Marine, Universitas Airlangga, Surabaya, Indonesia
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Mohammadzadeh S, Ahmadifar E, Masoudi E, Milla S, El-Shall NA, Alagawany M, Emran TB, Michalak I, Dhama K. Applications of recombinant proteins in aquaculture. AQUACULTURE 2022; 561:738701. [DOI: 10.1016/j.aquaculture.2022.738701] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/01/2023]
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Yuan X, Lin Y, Qin J, Zhang Y, Yang G, Cai R, Liao Z, Sun C, Li W. Molecular identification, tissue distribution and in vitro functional analysis of growth hormone and its receptors in red-spotted grouper (Epinephelus akaara). Comp Biochem Physiol B Biochem Mol Biol 2020; 250:110488. [PMID: 32781031 DOI: 10.1016/j.cbpb.2020.110488] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2020] [Revised: 07/01/2020] [Accepted: 08/03/2020] [Indexed: 11/15/2022]
Abstract
Red-spotted grouper (Epinephelus akaara) is one of the high economic value grouper species, however, the knowledge regarding its growth is limited. In this study, full-length cDNAs of growth hormone (gh) and its receptors (ghr1 and ghr2) were cloned from the pituitary and liver of red-spotted grouper, respectively. Tissue distribution analysis showed that gh mRNA was predominantly expressed in the pituitary. ghr1 mRNA was highly expressed in the liver, muscle, fat and gonad, while ghr2 mRNA expression was ubiquitously high in the peripheral tissues. However, the mRNA expression of both ghr isoforms was relatively low in the central nervous system. Secretory recombinant grouper GH (rgGH) was expressed in yeast Pichia pastoris and verified. HEK293T cells transiently transfected with the GHR isoforms were used to elucidate the receptor-mediated signaling pathways related to growth regulation. rgGH activated rapid phosphorylation of Janus kinase 2, signal transducer and activator of transcription 5 (STAT5) and extracellular signal-regulated protein kinase 1/2 through GHR1, but only STAT5 was phosphorylated via GHR2. rgGH strongly activated STAT5 phosphorylation and significantly stimulated ghr1, ghr2 and insulin-like growth factor (igf1, igf2) mRNA expression in primary cultured hepatocytes. Data showed that the recombinant protein rgGH played effects on igf1/2 mRNA expression via GHR-mediated signaling pathways. Our findings provide essential information about GH and GHRs characteristics in red-spotted grouper.
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Affiliation(s)
- Xi Yuan
- State Key Laboratory of Biocontrol, Guangdong Province Key Laboratory for Aquatic Economic Animals, Guangdong Provincial Engineering Technology Research Center for Healthy Breeding of Important Economic Fish, School of Life Sciences, Sun Yat-sen University, Guangzhou 510275, China
| | - Yuxin Lin
- State Key Laboratory of Biocontrol, Guangdong Province Key Laboratory for Aquatic Economic Animals, Guangdong Provincial Engineering Technology Research Center for Healthy Breeding of Important Economic Fish, School of Life Sciences, Sun Yat-sen University, Guangzhou 510275, China
| | - Jingkai Qin
- State Key Laboratory of Biocontrol, Guangdong Province Key Laboratory for Aquatic Economic Animals, Guangdong Provincial Engineering Technology Research Center for Healthy Breeding of Important Economic Fish, School of Life Sciences, Sun Yat-sen University, Guangzhou 510275, China
| | - Yazhou Zhang
- State Key Laboratory of Biocontrol, Guangdong Province Key Laboratory for Aquatic Economic Animals, Guangdong Provincial Engineering Technology Research Center for Healthy Breeding of Important Economic Fish, School of Life Sciences, Sun Yat-sen University, Guangzhou 510275, China
| | - Guokun Yang
- State Key Laboratory of Biocontrol, Guangdong Province Key Laboratory for Aquatic Economic Animals, Guangdong Provincial Engineering Technology Research Center for Healthy Breeding of Important Economic Fish, School of Life Sciences, Sun Yat-sen University, Guangzhou 510275, China
| | - Ruijian Cai
- State Key Laboratory of Biocontrol, Guangdong Province Key Laboratory for Aquatic Economic Animals, Guangdong Provincial Engineering Technology Research Center for Healthy Breeding of Important Economic Fish, School of Life Sciences, Sun Yat-sen University, Guangzhou 510275, China
| | - Zongzhen Liao
- State Key Laboratory of Biocontrol, Guangdong Province Key Laboratory for Aquatic Economic Animals, Guangdong Provincial Engineering Technology Research Center for Healthy Breeding of Important Economic Fish, School of Life Sciences, Sun Yat-sen University, Guangzhou 510275, China
| | - Caiyun Sun
- State Key Laboratory of Biocontrol, Guangdong Province Key Laboratory for Aquatic Economic Animals, Guangdong Provincial Engineering Technology Research Center for Healthy Breeding of Important Economic Fish, School of Life Sciences, Sun Yat-sen University, Guangzhou 510275, China
| | - Wensheng Li
- State Key Laboratory of Biocontrol, Guangdong Province Key Laboratory for Aquatic Economic Animals, Guangdong Provincial Engineering Technology Research Center for Healthy Breeding of Important Economic Fish, School of Life Sciences, Sun Yat-sen University, Guangzhou 510275, China.
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Chung WJ, Huang CL, Gong HY, Ou TY, Hsu JL, Hu SY. Recombinant production of biologically active giant grouper (Epinephelus lanceolatus) growth hormone from inclusion bodies of Escherichia coli by fed-batch culture. Protein Expr Purif 2015; 110:79-88. [PMID: 25703054 DOI: 10.1016/j.pep.2015.02.012] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2014] [Revised: 02/10/2015] [Accepted: 02/11/2015] [Indexed: 12/21/2022]
Abstract
Growth hormone (GH) performs important roles in regulating somatic growth, reproduction, osmoregulation, metabolism and immunity in teleosts, and thus, it has attracted substantial attention in the field of aquaculture application. Herein, giant grouper GH (ggGH) cDNA was cloned into the pET28a vector and expressed in Shuffle® T7 Competent Escherichia coli. Recombinant N-terminal 6× His-tagged ggGH was produced mainly in insoluble inclusion bodies; the recombinant ggGH content reached 20% of total protein. For large-scale ggGH production, high-cell density E. coli culture was achieved via fed-batch culture with pH-stat. After 30h of cultivation, a cell concentration of 41.1g/l dry cell weight with over 95% plasmid stability was reached. Maximal ggGH production (4.0g/l; 22% total protein) was achieved via mid-log phase induction. Various centrifugal forces, buffer pHs and urea concentrations were optimized for isolation and solubilization of ggGH from inclusion bodies. Hydrophobic interactions and ionic interactions were the major forces in ggGH inclusion body formation. Complete ggGH inclusion body solubilization was obtained in PBS buffer at pH 12 containing 3M urea. Through a simple purification process including Ni-NTA affinity chromatography and refolding, 5.7mg of ggGH was obtained from 10ml of fed-batch culture (45% recovery). The sequence and secondary structure of the purified ggGH were confirmed by LC-MS/MS mass spectrometry and circular dichroism analysis. The cell proliferation-promoting activity was confirmed in HepG2, ZFL and GF-1 cells with the WST-1 colorimetric bioassay.
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Affiliation(s)
- Wen-Jen Chung
- Department of Biological Science and Technology, National Pingtung University of Science and Technology, Pingtung, Taiwan
| | - Chi-Lung Huang
- Department of Biological Science and Technology, National Pingtung University of Science and Technology, Pingtung, Taiwan
| | - Hong-Yi Gong
- Department of Aquaculture, National Taiwan Ocean University, Keelung, Taiwan
| | - Tsung-Yin Ou
- Department of Industrial Engineering and Management, National Quemoy University, Kinmen, Taiwan
| | - Jue-Liang Hsu
- Department of Biological Science and Technology, National Pingtung University of Science and Technology, Pingtung, Taiwan
| | - Shao-Yang Hu
- Department of Biological Science and Technology, National Pingtung University of Science and Technology, Pingtung, Taiwan.
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BUDI DARMAWANSETIA, ALIMUDDIN, SUPRAYUDI MUHAMMADAGUS. Growth Response and Feed Utilization of Giant Gourami ( Osphronemus goramy ) Juvenile Feeding Different Protein Levels of the Diets Supplemented with Recombinant Growth Hormone. HAYATI JOURNAL OF BIOSCIENCES 2015. [DOI: 10.4308/hjb.22.1.12] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
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Zhang Y, Feng S, Chen J, Qin C, Lin H, Li W. Stimulatory effects of chitinase on growth and immune defense of orange-spotted grouper (Epinephelus coioides). FISH & SHELLFISH IMMUNOLOGY 2012; 32:844-854. [PMID: 22365990 DOI: 10.1016/j.fsi.2012.02.009] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/06/2011] [Revised: 02/02/2012] [Accepted: 02/07/2012] [Indexed: 05/31/2023]
Abstract
Chitinase, belonging to either family 18 or family 19 of the glycosylhydrolases, hydrolyze chitin into oligosaccharides. In the present study, the cDNA fragment encoding orange-spotted grouper (Epinephelus coioides) chitinase1 was subcloned into pPIC3.5K vector and expressed in Pichia pastoris GS115. The results showed that a band with the size of about 53 kDa could be detected by SDS-PAGE and Western blot. The recombinant protein of grouper chitinase1 (rgChi1) was added into the fish diet containing shrimp shell chitin for feeding experiment lasting 8 weeks. The weight of orange-spotted grouper, fed with diets containing rgChi1 at 0, 5, 10 and 20 μg/g was calculated on the 2nd, 4th, 6th and 8th weeks, and difference in growth rates was first observed in the 6th week of the feeding period and it kept until the end of the feeding experiment. At the end of 8 weeks feeding trial, the percent weight gain (PWG), growth rate (GR) and specific growth rate (SGR) of fish fed with 10 and 20 μg rgChi1/g feed were significantly higher compared to the control group. The neuropeptide Y (NPY), growth-hormone-releasing hormone (GHRH), growth-hormone (GH), interleukin-1beta (IL-1β), cyclooxygenase-2 (COX-2), superoxide dismutase (SOD) (Cu/Zn) and SOD (Mn) mRNA expression of fish fed with diet containing 10 μg/g or/and 20 μg/g rgChi1 were obviously higher than the control group. The lysozyme (LZM) and total SOD activity of fish fed with diet containing rgChi1 at 10 and 20 μg/g were significantly higher than that of the control. The aspartate aminotransferase (AST)/glutamic oxalacetic transaminases (GOT) activity in 20 μg/g group decreased compared to the control group. These results indicated that the grouper chitinase1 was successfully produced using the P. pastoris expression system and the recombinant protein had obvious effects on growth and immune defense. The mRNA expression and protein secretion of grouper chitinase1 and chitinase2 were significantly stimulated in spleen in response to bacterial lipopolysaccharide (LPS) challenge, strongly suggesting the existence of an innate pathway for local defense against chitin-containing organisms. Moreover, the pathogen such as Escherichia coli and Staphylococcus aureus could be inhibited by the recombinant protein of grouper chitinase1 to a certain extent.
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Affiliation(s)
- Yanhong Zhang
- State Key Laboratory of Biocontrol, Institute of Aquatic Economic Animals, School of Life Science, Sun Yat-Sen University, Guangzhou, PR China
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Carpio Y, Acosta J, Morales R, Santisteban Y, Sanchéz A, Estrada MP. Regulation of body mass growth through activin type IIB receptor in teleost fish. Gen Comp Endocrinol 2009; 160:158-67. [PMID: 19056390 DOI: 10.1016/j.ygcen.2008.11.009] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/01/2008] [Revised: 11/10/2008] [Accepted: 11/17/2008] [Indexed: 11/23/2022]
Abstract
Myostatin is a TGF-beta family member that plays a key role in regulating skeletal muscle growth. Previous studies in mammals have demonstrated that myostatin is capable of binding the two activin type II receptors. Additionally, activin type II receptors have been shown to be capable of binding a number of other TGF-beta family members besides myostatin. An injection of a soluble form of activin type IIB receptor obtained from CHO cells into wild-type mice generated up to a 60% increase in muscle mass in 2 weeks. The knowledge on the role of activin receptors in fish is limited. In the present study, we examined the growth effect of administering a recombinant, soluble form of goldfish activin type IIB receptor extracellular domain to juvenile and larval goldfish (Carassius auratus), African catfish (Clarias gariepinus) larvae and tilapia (Oreochromis aureus) larvae. We have expressed the goldfish activin type IIB receptor extracellular domain in the yeast Pichia pastoris and we have demonstrated for the first time that this recombinant molecule stimulates growth in teleost fish in a dose-dependent manner. We provide evidence that this body weight increase is achieved by an increase in muscle mass and protein content. Histological analysis of the goldfish muscle revealed that treated fish exhibited hyperplasia as compared to controls. These findings contribute to the understanding of the mechanisms that regulate growth in non-mammalian vertebrates and suggest a powerful biotechnology approach to improving fish growth in aquaculture.
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Affiliation(s)
- Yamila Carpio
- Aquatic Biotechnology Department, Animal Biotechnology Division, Center for Genetic Engineering and Biotechnology, Ave. 31e/158 y 190, P.O. Box 6162, Havana 10 600, Cuba
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Carpio Y, Lugo JM, León K, Morales R, Estrada MP. Novel function of recombinant pituitary adenylate cyclase-activating polypeptide as stimulator of innate immunity in African catfish (Clarias gariepinus) fry. FISH & SHELLFISH IMMUNOLOGY 2008; 25:439-445. [PMID: 18652901 DOI: 10.1016/j.fsi.2008.06.004] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/30/2008] [Revised: 06/23/2008] [Accepted: 06/25/2008] [Indexed: 05/26/2023]
Abstract
There are several studies that clearly indicate a close bidirectional communication between the neuroendocrine and immune systems. In this sense, hypothalamic releasing hormones, besides their neuroendocrine role, have been shown to influence immune functions. Despite studies developed in mammals, there is, as yet, no information available about the role of the pituitary adenylate cyclase-activating polypeptide (PACAP) and PACAP-related peptide (PRP) in the fish innate immune system. The present study has evaluated the effect of PACAP and PRP administered by bath immersion, on important parameters of innate immunity and antioxidant defenses in African catfish (Clarias gariepinus) fry. We have shown, for the first time, that administration of recombinant C. gariepinus PACAP not only promotes growth but also increases lysozyme, nitric oxide synthase-derived metabolites and antioxidant defenses in treated fry. From our results, PACAP appears to act as a regulator of the teleostean immune system, in addition to its physiological role in controlling growth of fish.
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Affiliation(s)
- Yamila Carpio
- Aquatic Biotechnology Department, Animal Biotechnology Division, Center for Genetic Engineering and Biotechnology, PO Box 6162, Havana, 10 600, Cuba
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Acosta J, Carpio Y, Besada V, Morales R, Sánchez A, Curbelo Y, Ayala J, Estrada MP. Recombinant truncated tilapia growth hormone enhances growth and innate immunity in tilapia fry (Oreochromis sp.). Gen Comp Endocrinol 2008; 157:49-57. [PMID: 18471813 DOI: 10.1016/j.ygcen.2008.03.009] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/11/2007] [Revised: 02/22/2008] [Accepted: 03/12/2008] [Indexed: 11/19/2022]
Abstract
Pichia pastoris cells transformed with a plasmid engineered for the expression of tilapia growth hormone as a secreted product produced a proteolytically cleaved form of the recombinant protein. The sequence of this truncated variant was obtained by mass spectrometry analysis. The cleavage site was determined to be between residues Tyr 158 and Tyr 159. The resulting truncated tilapia growth hormone was a single chain protein lacking 46 amino acids of the C-terminal portion. In this study, we showed that the truncated growth hormone produced in the P. pastoris culture supernatant has growth promoting effects and stimulates innate immune parameters (lysozyme and lectins) in tilapia larvae. These results suggest that the C-terminal portion of growth hormone is not required for its growth promoting activity and the innate immune functions studied herein in fish. In addition, we found that the culture supernatant containing truncated tilapia growth hormone has a stronger effect over growth and immune system than cells lysate containing intact tilapia growth hormone expressed in P. pastoris.
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Affiliation(s)
- Jannel Acosta
- Animal Biotechnology Division, Center for Genetic Engineering and Biotechnology, P.O. Box 6162, Havana 10600, Cuba
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Improving intracellular production of recombinant protein in Pichia pastoris using an optimized preinduction glycerol-feeding scheme. Appl Microbiol Biotechnol 2008; 78:257-64. [PMID: 18183387 DOI: 10.1007/s00253-007-1315-z] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2007] [Revised: 12/02/2007] [Accepted: 12/03/2007] [Indexed: 10/22/2022]
Abstract
High-cell-density production of recombinant growth hormone of Lateolabrax japonicus (rljGH) expressed intracellularly in Pichia pastoris was investigated. In the regular strategy of induction at a cell density of 160 g l(-1), short duration of intracellular rljGH accumulation (17 h) resulted in a low final cell density of 226 g l(-1). Thus, a novel strategy of induction at a cell density of 320 g l(-1) was investigated. In this strategy, the preinduction glycerol-feeding scheme had a significant effect on the post-induction production. Constant glycerol feeding led to a decrease of the specific rljGH production and specific production rate because of low preinduction specific growth rate. This decrease was avoided by exponential glycerol feeding to maintain a preinduction specific growth rate of 0.16 h(-1). The results from exponential glycerol feeding indicated that the rljGH production depended on the preinduction specific growth rate. Moreover, mixed feeding of methanol and glycerol during induction improved the specific production rate to 0.07 mg g(-1) h(-1) from 0.043 mg g(-1) h(-1). Consequently, both high cell density (428 g l(-1)) and high rljGH production could be achieved by the novel strategy: growing the cells at the specific growth rate of 0.16 h(-1) to the cell density of 320 g l(-1) and inducing the expression by mixed feeding.
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