Lecture 8: Chp. 7
Review Aids for Lecture 8:
Understand compositional differences between glycocalyx, basement membrane,
How does fibronectin and laminin contribute to embryonic development?
Functional role of integrins, importance of RGD motif.
Structural and functional differences between hemidesmosomes, desmosomes, gap
junctions, adherens junctions, tight junctions.
Similarities of gap junctions and plasmodesmata: in both plants and animals?
What are primary components of cell walls? Distinction between secondary vs.
primary cells wall?
Where are EMC synthesized, modified where, and how localized to outside how?
Example of role of cell adhesion in inflammation
microfibrils, cell plate, pectin, collagen, actin, cadherin, immunoglobins, connective
Why study ECM-Extra Cellular Matrices?
Cells interact with extracellular matrices & interact
with other cells to form tissues.
Important for: cell migration, growth, differentiation
and organization during embryogenesis.
Cell coat is a glycocalyx (carbohydrates projecting
from cell surface, in animals have basal membrane
connection) – prominent in epidermal cells - skin,
secretary ducts, intestine, lung, etc., signaling
Provides mechanical & dehydration protection,
strength, cell shape maintenance – particularly in
plant cells and unicells.
Plant seedling root growing through soil
Root hair tip EM: secretory vesc.
(Taiz & Zeiger 03 Plant Physiol.)