The microstructure of laminin-111 compensates for dystroglycan loss in mammary epithelial cells in downstream expression of milk proteins

Kent, A. J.; Mayer, N.; Inman, J. L.; Hochman-Mendez, C.; Bissell, M. J.; Robertson, C.

doi:10.1016/j.biomaterials.2019.119337

The microstructure of laminin-111 compensates for dystroglycan loss in mammary epithelial cells in downstream expression of milk proteins

Journal Article · Tue Jul 09 00:00:00 EDT 2019 · Biomaterials

DOI:https://doi.org/10.1016/j.biomaterials.2019.119337· OSTI ID:1760179

Kent, A. J. ^[1]; Mayer, N. ^[1]; Inman, J. L. ^[1]; Hochman-Mendez, C. ^[2]; Bissell, M. J. ^[1]; Robertson, C. ^[3]

Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Texas Heart Inst., Houston, TX (United States)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

Laminin-111 (Ln-1), an extracellular matrix (ECM) glycoprotein found in the basement membrane of mammary gland epithelia, is essential for lactation. In mammary epithelial cells (MECs), dystroglycan (Dg) is believed to be necessary for polymerization of laminin-111 into networks., thus we asked whether correct polymerization could compensate for Dg loss. Artificially polymerized laminin-111 and the laminin-glycoprotein mix Matrigel, both formed branching, spread networks with fractal dimensions from 1.7 to 1.8, whereas laminin-111 in neutral buffers formed small aggregates without fractal properties (a fractal dimension of 2). In Dg knockout cells, either polymerized laminin-111 or Matrigel readily attached to the cell surface, whereas aggregated laminin-111 did not. In contrast, polymerized and aggregated laminin-111 bound similarly to Dg knock-ins. Both polymerized laminin-111 and Matrigel promoted cell rounding, clustering, formation of tight junctions, and expression of milk proteins, whereas aggregated Ln-1 did not attach to cells or promote functional differentiation. Finally, these findings support that the microstructure of Ln-1 networks in the basement membrane regulates mammary epithelial cell function.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: AC02-05CH11231; AC52-07NA27344

OSTI ID:: 1760179

Alternate ID(s):: OSTI ID: 1564332

Report Number(s):: LLNL-JRNL--766544; ark:/13030/qt44v5c2wx

Journal Information:: Biomaterials, Journal Name: Biomaterials Vol. 218; ISSN 0142-9612

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Related Subjects

59 BASIC BIOLOGICAL SCIENCES
dystroglycan
laminin
mammary differentiation
microstructure

The microstructure of laminin-111 compensates for dystroglycan loss in mammary epithelial cells in downstream expression of milk proteins

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