Laminin isoforms in fetal and adult human adrenal cortex.
Laminin has been proposed to influence the function of human adrenal cortex. We have studied the distribution of laminin (Ln) chains using immunofluorescence in human fetal and adult adrenal cortex. In the fetal gland Ln alpha2- and alpha5-chains were weakly expressed in the definitive zone, whereas Ln alpha4-, beta1-, and gamma1-chains occurred around vessels. In the adult gland, Ln alpha2-, alpha5-, and gamma1-chains were found in epithelial basement membranes (BM) in all cortical zones, Ln alpha4-chain in vessels, Ln beta1-chain in outer zone, and Ln beta2-chain in the two inner zones of the cortex, respectively. Among the integrins in adult gland, integrin alpha(3)-subunit was confined to basal surfaces of cortical cells, alpha(6) to vessels, alpha(1) to the stroma, and alpha(2) diffusely to epithelial cells. Lutheran glycoprotein and dystroglycan occurred in the fetal gland diffusely in the definitive zone and throughout the epithelium in the adult. The isoform composition of BM of the adult adrenal gland is distinct, with Ln-2 and -10 in BM of the outer zone and Ln-4 and -11 in BM of the two inner zones. The results suggest that integrin alpha(3)beta(1) and Lutheran are candidate receptors for Ln-10 and -11, whereas dystroglycan probably binds Ln-2 and -4.
Virtanen
Ismo
I
Institute of Biomedicine/Anatomy, Haartmaninkatu 8, University of Helsinki, FIN-00014 Helsinki, Finland. ismo.virtanen@helsinki.fi
Korhonen
Matti
M
Petäjäniemi
Noora
N
Karhunen
Tuula
T
Thornell
Lars-Eric
LE
Sorokin
Lydia M
LM
Konttinen
Yrjö T
YT
D000302:Adrenal Cortex / Q000737:chemistry* / Q000196:embryology*; D000328:Adult; D001485:Basement Membrane / Q000737:chemistry / Q000196:embryology; D005333:Fetus; D019084:Fluorescent Antibody Technique, Indirect; D006801:Humans; D007536:Isomerism; D007797:Laminin / Q000032:analysis*; D015383:Zona Fasciculata / Q000737:chemistry / Q000196:embryology
C501369:LAMA4 protein, human; C478221:LAMB1 protein, human; D007797:Laminin; C102645:laminin alpha 2; C097043:laminin alpha5; C089141:laminin gamma 1; C058783:laminin beta2