title: Similarity of recombinant human perlecan domain 1 by alternative expression systems bioactive heterogenous recombinant human perlecan D1.
abstract: BACKGROUND
  Heparan sulfate glycosaminoglycans are diverse components of certain proteoglycans and are known to interact with growth factors as a co-receptor necessary to induce signalling and growth factor activity. In this report we characterize heterogeneously glycosylated recombinant human perlecan domain 1 (HSPG2 abbreviated as rhPln.D1) synthesized in either HEK 293 cells or HUVECs by transient gene delivery using either adenoviral or expression plasmid technology.
  
  
  RESULTS
  By SDS-PAGE analysis following anion exchange chromatography, the recombinant proteoglycans appeared to possess glycosaminoglycan chains ranging, in total, from 6 kDa to >90 kDa per recombinant. Immunoblot analysis of enzyme-digested high Mr rhPln.D1 demonstrated that the rhPln.D1 was synthesized as either a chondroitin sulfate or heparan sulfate proteoglycan, in an approximately 2:1 ratio, with negligible hybrids. Secondary structure analysis suggested helices and sheets in both recombinant species. rhPln.D1 demonstrated binding to rhFGF-2 with an apparent kD of 2 ± 0.2 nM with almost complete susceptibility to digestion by heparinase III in ligand blot analysis but not to chondroitinase digestion. Additionally, we demonstrate HS-mediated binding of both rhPln.D1 species to several other GFs. Finally, we corroborate the augmentation of FGF-mediated cell activation by rhPln.D1 and demonstrate mitogenic signalling through the FGFR1c receptor.
  
  
  CONCLUSIONS
  With importance especially to the emerging field of DNA-based therapeutics, we have shown here that proteoglycan synthesis, in different cell lines where GAG profiles typically differ, can be directed by recombinant technology to produce populations of bioactive recombinants with highly similar GAG profiles.
authors.affiliation: Agenta Biotechnologies, Inc., Innovation Depot, Birmingham, AL 35203, USA.
authors.forename: April L
authors.initials: AL
authors.lastname: Ellis
authors.forename: Wensheng
authors.initials: W
authors.lastname: Pan
authors.forename: Guang
authors.initials: G
authors.lastname: Yang
authors.forename: Kim
authors.initials: K
authors.lastname: Jones
authors.forename: Christine
authors.initials: C
authors.lastname: Chuang
authors.forename: John M
authors.initials: JM
authors.lastname: Whitelock
authors.forename: Arthur A
authors.initials: AA
authors.lastname: DeCarlo
mesh_terms: D000256:Adenoviridae; D002460:Cell Line; D049109:Cell Proliferation; D018014:Gene Transfer Techniques; D019812:Heparan Sulfate Proteoglycans / Q000096:biosynthesis* / Q000302:isolation & purification; D006801:Humans; D017433:Protein Structure, Secondary; D011994:Recombinant Proteins / Q000096:biosynthesis / Q000302:isolation & purification; D019076:Transgenes
chemical_list: D019812:Heparan Sulfate Proteoglycans; D011994:Recombinant Proteins; C071927:perlecan