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Compartmental distribution of sulfated glycosaminoglycans in lateral and medial midbrain astroglial cultures

1996; Wiley; Volume: 17; Issue: 4 Linguagem: Inglês

10.1002/(sici)1098-1136(199608)17

1098-1136

J. Garcia‐Abreu, Luiz Claudio F. Silva, Fernanda Tovar‐Moll, Glaucia R. Onofre, Leny A. Cavalcante, Vivaldo Moura‐Neto,

Cell Adhesion Molecules Research

Sulfated glycosaminoglycans (S-GAGs) were isolated from the pericellular (P), intracellular (I), and extracellular (E) compartments of astrocytes cultures from lateral (L) and medial (M) sectors of embryonic mouse midbrain; these sectors differ in their ability to support neurite growth (L, permissive, M, non-permissive for growth) and laminin deposition patterns (L, fibrillar; M, punctate pattern). The total amount of S-GAGs in M cultures was twice that in L cultures and was particularly high in the P compartment of M glia. Both glial cultures showed heparan sulfate (HS) in the three cellular compartments but chondroitin sulfate (CS) GAGs were vestigial in I and P compartments of L glia. Our results suggest that M and L astrocytes are heterogeneous concerning the ability to synthesize GAGs and distribute them among the different cellular compartments. Together with other data (Garcia-Abreu et al: J Neurosci Res 40:471, 1995; Garcia-Abreu et al: Neuroreport 6:761, 1995), the present results suggest that this heterogeneous features might be at least partially responsible for the differential effects of L and M glial cultures on the growth of midbrain neurons and may also be involved in complex ways in the guidance of axons at the brain midline.