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Claeys L, Zhytnik L, Wisse LE, van Essen HW, Eekhoff EMW, Pals G, Bravenboer N, Micha D. Exploration of the skeletal phenotype of the Col1a1 +/Mov13 mouse model for haploinsufficient osteogenesis imperfecta type 1. Front Endocrinol (Lausanne) 2023; 14:1145125. [PMID: 36967771 PMCID: PMC10031054 DOI: 10.3389/fendo.2023.1145125] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/15/2023] [Accepted: 02/17/2023] [Indexed: 03/29/2023] Open
Abstract
INTRODUCTION Osteogenesis Imperfecta is a rare genetic connective tissue disorder, characterized by skeletal dysplasia and fragile bones. Currently only two mouse models have been reported for haploinsufficient (HI) mild Osteogenesis Imperfecta (OI); the Col1a1 +/Mov13 (Mov13) and the Col1a1 +/-365 mouse model. The Mov13 mice were created by random insertion of the Mouse Moloney leukemia virus in the first intron of the Col1a1 gene, preventing the initiation of transcription. Since the development of the Mov13 mice almost four decades ago and its basic phenotypic characterization in the 90s, there have not been many further studies. We aimed to extensively characterize the Mov13 mouse model in order to critically evaluate its possible use for preclinical studies of HI OI. METHODS Bone tissue from ten heterozygous Mov13 and ten wild-type littermates (WT) C57BL/6J mice (50% males per group) was analyzed at eight weeks of age with bone histomorphometry, micro computed tomography (microCT), 3-point bending, gene expression of different collagens, as well as serum markers of bone turnover. RESULTS The Mov13 mouse presented a lower bone strength and impaired material properties based on our results of 3-point bending and microCT analysis respectively. In contrast, no significant differences were found for all histomorphometric parameters. In addition, no significant differences in Col1a1 bone expression were present, but there was a significant lower P1NP concentration, a bone formation marker, measured in serum. Furthermore, bone tissue of Mov13 mice presented significantly higher expression of collagens (Col1a2, Col5a1 and Col5a2), and bone metabolism markers (Bglap, Fgf23, Smad7, Edn1 and Eln) compared to WT. Finally, we measured a significantly lower Col1a1 expression in heart and skin tissue and also determined a higher expression of other collagens in the heart tissue. CONCLUSION Although we did not detect a significant reduction in Col1a1 expression in the bone tissue, a change in bone structure and reduction in bone strength was noted. Regrettably, the variability of the bone phenotype and the appearance of severe lymphoma in adult Mov13 mice, does not favor their use for the testing of new long-term drug studies. As such, a new HI OI type 1 mouse model is urgently needed.
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Affiliation(s)
- Lauria Claeys
- Department of Human Genetics, Amsterdam Movement Sciences, Tissue Function & Regeneration and Musculoskeletal Health, Amsterdam University Medical Centers (UMC) location Vrije Universiteit Amsterdam, Amsterdam, Netherlands
| | - Lidiia Zhytnik
- Department of Human Genetics, Amsterdam Movement Sciences, Tissue Function & Regeneration and Musculoskeletal Health, Amsterdam University Medical Centers (UMC) location Vrije Universiteit Amsterdam, Amsterdam, Netherlands
- Department of Traumatology and Orthopeadics, Institute of Clinical Medicine, The University of Tartu, Tartu, Estonia
| | - Lisanne E. Wisse
- Department of Human Genetics, Amsterdam Movement Sciences, Tissue Function & Regeneration and Musculoskeletal Health, Amsterdam University Medical Centers (UMC) location Vrije Universiteit Amsterdam, Amsterdam, Netherlands
| | - Huib W. van Essen
- Department of Clinical Chemistry, Amsterdam Movement Sciences, Tissue Function & Regeneration and Ageing & Vitality, Amsterdam University Medical Centers (UMC) location Vrije Universiteit Amsterdam, Amsterdam, Netherlands
| | - E. Marelise W. Eekhoff
- Department of Endocrinology and Metabolism, Amsterdam Rare Bone Disease Center, Amsterdam University Medical Centers (UMC), Amsterdam, Netherlands
| | - Gerard Pals
- Department of Human Genetics, Amsterdam Movement Sciences, Tissue Function & Regeneration and Musculoskeletal Health, Amsterdam University Medical Centers (UMC) location Vrije Universiteit Amsterdam, Amsterdam, Netherlands
| | - Nathalie Bravenboer
- Department of Clinical Chemistry, Amsterdam Movement Sciences, Tissue Function & Regeneration and Ageing & Vitality, Amsterdam University Medical Centers (UMC) location Vrije Universiteit Amsterdam, Amsterdam, Netherlands
| | - Dimitra Micha
- Department of Human Genetics, Amsterdam Movement Sciences, Tissue Function & Regeneration and Musculoskeletal Health, Amsterdam University Medical Centers (UMC) location Vrije Universiteit Amsterdam, Amsterdam, Netherlands
- *Correspondence: Dimitra Micha,
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Gotkin MG, Ripley CR, Lamande SR, Bateman JF, Bienkowski RS. Intracellular trafficking and degradation of unassociated proalpha2 chains of collagen type I. Exp Cell Res 2004; 296:307-16. [PMID: 15149860 DOI: 10.1016/j.yexcr.2004.01.029] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2003] [Revised: 01/23/2004] [Indexed: 10/26/2022]
Abstract
Procollagen I is a trimer consisting of two proalpha1(I) chains and one proalpha 2(I) chain. In certain cases of mild osteogenesis imperfecta, abnormal proalpha1(I) chains are degraded very soon after synthesis. As a consequence, the cells produce excess proalpha2(I) chains, which cannot form trimers and are not secreted. The objective of this work was to determine the intracellular fate of unassociated proalpha2(I) chains. Mov13 mouse fibroblasts, which do not synthesize proalpha1(I) mRNA, but do produce proalpha2(I) mRNA, were incubated with radioactive amino acids using pulse-chase protocols, and proteins were analyzed by gel electrophoresis, autoradiography, and Western blotting. Mov13 cells produced proalpha2(I) chains that were degraded intracellularly within 30 min. Degradation was inhibited when cells were treated with brefeldin-A, which blocks transit from endoplasmic reticulum to Golgi. Fixed cells exposed to various immunofluorescence markers and imaged by confocal laser scanning microscopy showed that proalpha2(I) chains colocalized with Golgi and lysosome markers. Degradation was inhibited and chains were secreted when cells were treated with wortmannin, which blocks trafficking to lysosomes. These results demonstrate that unassociated proalpha2(I) chains leave the endoplasmic reticulum, transit the Golgi, and enter lysosomes where they are degraded.
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Affiliation(s)
- Marilyn G Gotkin
- Program in Biology, Graduate Center of the City University of New York, New York 11016, USA
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Campbell BG, Wootton JA, Macleod JN, Minor RR. Canine COL1A2 mutation resulting in C-terminal truncation of pro-alpha2(I) and severe osteogenesis imperfecta. J Bone Miner Res 2001; 16:1147-53. [PMID: 11393792 DOI: 10.1359/jbmr.2001.16.6.1147] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
RNA and type I collagen were analyzed from cultured skin fibroblasts of a Beagle puppy with fractures consistent with type III osteogenesis imperfecta (OI). In a nonisotopic RNAse cleavage assay (NIRCA), the proband's RNA had a unique cleavage pattern in the region of COL1A2 encoding the C-propeptide. DNA sequence analyses identified a mutation in which nucleotides 3991-3994 ("CTAG") were replaced with "TGTCATTGG." The first seven bases of the inserted sequence were identical to nucleotides 4002-4008 of the normal canine COL1A2 sequence. The resulting frameshift changed 30 amino acids and introduced a premature stop codon. Reverse-transcription polymerase chain reaction (RT-PCR) with primers flanking the mutation site amplified two complementary DNA (cDNA) fragments for the proband and a single product for the control. Restriction enzyme digestions also were consistent with a heterozygous mutation in the proband. Type I procollagen labeled with [3H]proline was analyzed by sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE). Increased density of pC-alpha2(I) suggested comigration with the similarly sized pro-alpha2(I) derived from the mutant allele. Furthermore, a-chains were overhydroxylated and the ratio of alpha1(I):alpha2(I) was 3.2:1, consistent with the presence of alpha1(I) homotrimers. Analyses of COL1A2 and type I collagen were both consistent with the described heterozygous mutation affecting the pro-alpha2(I) C-propeptide and confirmed a diagnosis of OI.
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Affiliation(s)
- B G Campbell
- Department of Biomedical Sciences, College of Veterinary Medicine, Cornell University, Ithaca, New York 14853, USA
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Campbell BG, Wootton JA, MacLeod JN, Minor RR. Sequence of normal canine COL1A1 cDNA and identification of a heterozygous alpha1(I) collagen Gly208Ala mutation in a severe case of canine osteogenesis imperfecta. Arch Biochem Biophys 2000; 384:37-46. [PMID: 11147834 DOI: 10.1006/abbi.2000.2099] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The sequence of canine COL1A1 cDNA was determined from four overlapping COL1A1 RT-PCR products generated from canine fibroblast RNA. In the translated region, nucleotide identity between canine and human COL1A1 cDNA was 93.2%, although the canine sequence lacked nucleotides 204 to 215 in the region coding for the N-propeptide. Amino acid identity was 97.7%. Total RNA and type I collagen were collected from cultured skin fibroblasts of a 12-week-old male golden retriever with pathologic fractures suggestive of osteogenesis imperfecta (OI) and dentinogenesis imperfecta. Sequential, overlapping approximately 1,000-bp fragments of COL1A1 and COL1A2 cDNA were each amplified by RT-PCR using primers containing 5' T7 polymerase sites. These PCR products were transcribed with T7 RNA polymerase, hybridized into RNA duplexes, and cleaved at mismatch sites with RNase. The proband had an unique cleavage pattern for the fragment of COL1A1 mRNA spanning nucleotides 709 to 1,531. Sequence analysis identified a G to C point mutation for nucleotide 1,276, predicting a codon change from glycine (GGA) to alanine (GCA) for amino acid 208. This change disrupts the normal Gly-X-Y pattern of the collagen triple helix. Restriction enzyme digestion of the RT-PCR product was consistent with a heterozygous COL1A1 mutation. Type I collagen was labeled with 3H-proline, salt precipitated, and analyzed by SDS-PAGE. Pepsin digested alpha chains were over-hydroxylated, and procollagen processing was delayed. Thus, canine and human OI appear homologous in terms of clinical presentation, etiology, and pathogenesis.
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Affiliation(s)
- B G Campbell
- Department of Biomedical Sciences, College of Veterinary Medicine, Cornell University, Ithaca, New York 14853, USA
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Lim AL, Doyle SA, Balian G, Smith BD. Role of the pro-α2(I) COOH-terminal region in assembly of type I collagen: Truncation of the last 10 amino acid residues of pro-α2(I) chain prevents assembly of type I collagen heterotrimer. J Cell Biochem 1998. [DOI: 10.1002/(sici)1097-4644(19981101)71:2<216::aid-jcb7>3.0.co;2-y] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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Tillet E, Wiedemann H, Golbik R, Pan TC, Zhang RZ, Mann K, Chu ML, Timpl R. Recombinant expression and structural and binding properties of alpha 1(VI) and alpha 2(VI) chains of human collagen type VI. EUROPEAN JOURNAL OF BIOCHEMISTRY 1994; 221:177-85. [PMID: 8168508 DOI: 10.1111/j.1432-1033.1994.tb18727.x] [Citation(s) in RCA: 98] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Full-length alpha 1(VI) and alpha 2(VI) cDNAs in an eukaryotic expression vector were used to obtain stably transfected human kidney cell clones and to purify these collagen-VI chains in substantial quantities from the culture medium. Both chains appeared mainly as monomers together with some dimers that were disulfide linked through their C-terminal globular domains. Despite sufficient hydroxylation of proline and lysine residues, the chains did not form a triple-helix, as shown by electronmicroscopy, CD spectra and pepsin sensitivity. Digestion of the chains with bacterial collagenase released the N-terminal and C-terminal globular domains, which were identified by their size and partial sequences. They showed a substantial content of alpha-helical conformation and a distinct globular structure after rotary shadowing. Antibodies could be raised that distinguished between the two chains and reacted with the globular domains. The alpha 2(VI) but not the alpha 1(VI) chain showed binding to a heparan sulfate proteoglycan (perlecan), fibronectin and pepsin-solubilized collagen VI. Purified globular domains did not bind these ligands indicating the localization of binding sites within the triple-helical domain. Both chains showed a distinct affinity for heparin but failed to bind to various collagen types.
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Affiliation(s)
- E Tillet
- Max-Planck-Institut für Biochemie, Martinsried, Germany
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Bonadio J, Jepsen KJ, Mansoura MK, Jaenisch R, Kuhn JL, Goldstein SA. A murine skeletal adaptation that significantly increases cortical bone mechanical properties. Implications for human skeletal fragility. J Clin Invest 1993; 92:1697-705. [PMID: 8408623 PMCID: PMC288329 DOI: 10.1172/jci116756] [Citation(s) in RCA: 86] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023] Open
Abstract
Mov13 mice carry a provirus that prevents transcription initiation of the alpha 1(I) collagen gene. Mutant mice homozygous for the null mutation produce no type I collagen and die at mid-gestation, whereas heterozygotes survive to adulthood. Dermal fibroblasts from heterozygous mice produce approximately 50% less type I collagen than normal littermates, and the partial deficiency in collagen production results in a phenotype similar to osteogenesis imperfecta type I (an inherited form of skeletal fragility). In this study, we have identified an adaptation of Mov13 skeletal tissue that significantly improves the bending strength of long bone. The adaptive response occurred over a 2-mo period, during which time a small number of newly proliferated osteogenic cells produced a significant amount of matrix components and thus generated new bone along periosteal surfaces. New bone deposition resulted in a measurable increase in cross-sectional geometry which, in turn, led to a dramatic increase in long bone bending strength.
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Affiliation(s)
- J Bonadio
- Department of Pathology, University of Michigan, Ann Arbor 48109-0650
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Transgenic mouse model of the mild dominant form of osteogenesis imperfecta. Proc Natl Acad Sci U S A 1990; 87:7145-9. [PMID: 2402497 PMCID: PMC54700 DOI: 10.1073/pnas.87.18.7145] [Citation(s) in RCA: 110] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
Osteogenesis imperfecta type I is a mild, dominantly inherited, connective tissue disorder characterized by bone fragility. Mutations in type I collagen account for all known cases. In Mov-13 mice, integration of a murine retrovirus within the first intron of the alpha 1(I) collagen gene results in a null allele blocked at the level of transcription. This study demonstrates that mutant mice heterozygous for the null allele are a model of osteogenesis imperfecta type I. A defect in type I collagen production is associated with dominant-acting morphological and functional defects in mineralized and nonmineralized connective tissue and with progressive hearing loss. The model provides an opportunity to investigate the effect of a reduced amount of type I collagen on the structure and integrity of extracellular matrix. It also may represent a system in which therapeutic strategies to strengthen connective tissue can be developed.
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Wu H, Byrne MH, Stacey A, Goldring MB, Birkhead JR, Jaenisch R, Krane SM. Generation of collagenase-resistant collagen by site-directed mutagenesis of murine pro alpha 1(I) collagen gene. Proc Natl Acad Sci U S A 1990; 87:5888-92. [PMID: 2165607 PMCID: PMC54434 DOI: 10.1073/pnas.87.15.5888] [Citation(s) in RCA: 103] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
Collagenase (matrix metalloproteinase 1) cleaves type I, II, and III collagen helices at a specific site between Gly-Ile or Gly-Leu bonds (residues 775 and 776, P1-P1'). To understand the mechanism of collagen processing, mutations around the cleavage site have been introduced into the cloned murine pro alpha 1(I) collagen (Col1a1) gene. These mutant constructs have been transfected into homozygous Mov13 fibroblasts that do not express the endogenous Col1a1 gene due to a retroviral insertion. Secreted triple-helical type I collagens containing substitutions of Pro for Ile (position 776) (P1') were not cleaved by human rheumatoid synovial collagenase, whereas those containing substitutions of Met for Ile (position 776) were cleaved. Type I collagens containing double substitutions of Pro for Gln-774 (P2) and Ala-777 (P2') were not cleaved regardless of whether they contained the wild-type residue Ile at position 776 or the substitution of Met for Ile at position 776. The wild-type alpha 2(I) chains derived from the endogenous Col1a2 gene were also resistant to enzyme digestion when they were complexed with the mutant alpha 1(I) chains, indicating that the presence of normal alpha 1(I) sequences is critical for cleavage of the alpha 2(I) chains in the type I heterotrimer.
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Affiliation(s)
- H Wu
- Department of Biology, Massachusetts Institute of Technology, Cambridge 02142
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Bonaldo P, Mucignat MT, Colombatti A. Efficient expression of chicken alpha 1(VI) collagen chain in transiently transfected mammalian cells. MATRIX (STUTTGART, GERMANY) 1990; 10:139-47. [PMID: 2215354 DOI: 10.1016/s0934-8832(11)80162-9] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Type VI collagen is a component of the extracellular matrix made of three subunits, alpha 1(VI) and alpha 2(VI) (Mr = 140,000), and alpha 3(VI) (Mr = greater than 300,000). Triple helical monomers assemble intracellularly into disulfide-linked dimers and tetramers, with the tetramers being the "building blocks" that give rise to higher order extracellular structures by head-to-head association, the microfilaments. To study the pattern of assembly and the structure-function relationships of type VI collagen, we transfected mammalian cells with a full-length cDNA coding for chicken alpha 1(VI) under the control of SV40 early and late promoters and assayed the expression, secretion, and assembly of the protein by immunoperoxidase and immunoprecipitation of metabolically labeled cells. First, conditions were determined that allowed efficient transfection both in African monkey kidney COS-1 and CV-1 cells and in mouse fibroblasts. In our hands the late promoter was most efficient in CV-1 cells; whereas the early promoter was efficient in L cells at three days post-transfection. Chicken alpha 1(VI) could be isolated from cell extracts as well as from cell medium. Both the intracellular and the secreted forms of alpha 1(VI) are present as a monomer polypeptide and as disulfide-linked dimers and trimers that migrate in SDS gels with apparent Mr of about 130,000, 240,000 and 360,000, respectively. In L cells, endogenous mouse type VI collagen also was isolated by immunoprecipitation with specific antibodies. However, heterologous molecules made of the chicken alpha 1(VI) chain and the mouse alpha 2(VI) and alpha 3(VI) chains were not detected in the present experiments. Digestion with pepsin of the non-reduced chicken alpha 1(VI) polypeptides immunoprecipitated from the cell medium resulted in the disappearance of the bands, suggesting improper or non-stable assembly of alpha 1(VI) homotrimers. These data support predictions from sequence analysis that type VI collagen heterotrimeric molecules are more stable than other assembly alternatives.
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Affiliation(s)
- P Bonaldo
- Divisione di Oncologia Sperimentale 2, Centro di Referimento Oncologico, Aviano, Italy
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Fine A, Poliks CF, Smith BD, Goldstein RH. The accumulation of type I collagen mRNAs in human embryonic lung fibroblasts stimulated by transforming growth factor-beta. Connect Tissue Res 1990; 24:237-47. [PMID: 2376126 DOI: 10.3109/03008209009152152] [Citation(s) in RCA: 32] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
We examined the expression of type I collagen mRNAs (alpha 1(I) and alpha 2 (I)) by embryonic lung fibroblasts in cultures treated with transforming growth factor-beta (TGF-beta). TGF-beta caused a concentration dependent increase in the expression of alpha 1(I) mRNA for type I collagen. TGF-beta at low concentration (0.1 ng/ml) slightly increased the level of alpha 1(I) mRNA. Higher concentrations of TGF-beta (1.0 and 5.0 ng/ml) further increased the amount of alpha 1(I) mRNA. The increase in alpha 1(I) mRNA was associated with a marked increase in production of intact type I collagen molecules. TGF-beta did not increase expression of alpha 2(I) mRNA. The alpha 2(I) mRNA levels in human lung fibroblast cultures were not affected by varying the duration of exposure to TGF-beta nor the concentration of TGF-beta. In contrast, TGF-beta increased the amount of both alpha 1(I) and alpha 2(I) mRNA in NIH3T3 cells. These data suggest that the amount of alpha 2(I) mRNA is not rate limiting with respect to type I collagen production during TGF-beta stimulation in human lung fibroblast cultures.
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Affiliation(s)
- A Fine
- Pulmonary Center, Boston University School of Medicine, MA 02118
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Greenspan D, Hoffman G, Lee B. High levels of expression of full length human pro-α2(V) collagen cDNA in pro-α2(V)-deficient hamster cells. J Biol Chem 1989. [DOI: 10.1016/s0021-9258(19)47117-2] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
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Lee ST, Smith BD, Greenspan DS. Construction of a full-length cDNA encoding human pro-alpha 2(I) collagen and its expression in pro-alpha 2(I)-deficient W8 rat cells. J Biol Chem 1988. [DOI: 10.1016/s0021-9258(18)37720-2] [Citation(s) in RCA: 29] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
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