Infusion of soluble laminin-1 disrupts endogenous laminin in the wild-type
mouse hippocampus but is not neurotoxic. Wild-type mice were unilaterally
infused with buffer or purified mouse laminin-1 (0.5 mg/ml) for 7 d, brain
sections were prepared and stained with anti-laminin-1 antibody. Laminin in
the hippocampal neuronal call layers in buffer infused animals is intact (A),
but in the soluble laminin-infused animals the endogenous laminin in the CA 1
and DG neuronal cell layers of the infused side is disrupted (B). Cresyl
violet (C) and Fluoro Jade B (E) staining show that infusion of soluble
laminin is not neurotoxic. Higher magnification of the boxed area in C is
shown in D. (F) A positive control for Fluoro Jade B staining, which stains
degenerating neurons after kainate injection. CA1, CA3, and DG denote regions
of the hippocampus. Ln, Laminin-1 immunostaining; CV, cresyl violet staining;
FJB, Fluoro Jade B staining. Bar in C for A–C, 500 μm; bar in D for
D–F, 25 μm.