CAMs and Junctions Flashcards Preview

Cells/Histology, Josh > CAMs and Junctions > Flashcards

Flashcards in CAMs and Junctions Deck (44):
1

Desmocollins and Desmogleins belong to which group of CAMs?

Cadherins

2

Zonula occludens and Desmosomes are associated with what type of CAM?

Cadherins

3

What serves as a major interface between the cadherins that hold adjacent cells together and their acting cytoskeletons?

Catenins

4

________ bind molecules in the ECM such as fibronectin and laminin

Integrins

5

__________ are molecular complexes that anchor cells together and reinforce the physical integrity of tissues and the cells that cells that make up the tissue

Zonula Adherens

6

_______ attach one cell to the ECM and are only associated with the basal domains

Hemidesmosomes

7

Selectins bind to ___________

carbohydrates

8

Fribronectin:

glycoprotein formed by two identical chains linked by disulfide linkages close to the c-terminal.

9

Two forms of fibronectin.

1. Cellular fibronectin: from fibroblast, forms part of ECM
2.Plasma fibronectin: from hepatocytes, secreted into bloodstream.

10

Binding sites on fibronectin: (4)

heparing (proteoglycan), integrins, collagen, fibrin.

11

What are the types of calcium dependent CAMs?

cadherins, selectins

12

What are the two types of calcium independent CAMs?

Integrins, immunoglobulin superfamily molecules

13

Ligand recognized by cadherins

other cadherins (same or different, it don't matter)

14

Ligand recognized by selectins

carbohydrates

15

Ligand recognized by integrins

extracellular matrix molecules

16

Ligand recognized by Ig superfamily

integrins

17

E-Cadherins (a classical cadherin) are found where?

Epithelial tissues

18

N-Cadherins (a classical Cadherin) are found where?

Nerve cells

19

P-Cadherins (a classical Cadherin) are found where?

Placenta.

20

Desmocollins and desmogleins (nonclassical cadherins) are found where?

Desmosomes (macula adherens)

21

_________ are the most common type of cadherins and have a __________ binding face.

1. E-cadherins 2. HVA (form homophilic dimers)

22

A loss of __________, can be associated with invasive behavior of tumor cells.

e-cadherins

23

__________ are small proteins that link the cytoplasmic end of a cadherin with cytoplasmic actin

Catenins

24

Integrins have how many subunits?

Two

25

Name the Proteins (3) that can be used to connect integrin to actin filaments

Talin, Vinculin, Alpha-actinin

26

Give an example of intracellular tonofilaments

intermediate filaments such as keratin

27

in hemidesmosomes, __________ link the basal domains of cells vis the intracellular tonofilaments

Integrins

28

N-CAM

neural adhesion molecules.

29

I-cam-1 and I-cam-2

I-CAM-1 facilitates transendothelial migration of leukocytes

30

Adherens

are molecular complexes that anchor cell together and reinforce the physical integrity of tissues and the cells that make up the tissues.

31

Occludens

molecular complexes that establish and impermeable barrier between adjacent cells, especially epithelial cells, that prevents paracellular transport and maintains concentration differences btwn the environments on either site of the epithelial sheets.

32

Gap Junctions

composed of molecular pores that enable cells to rapidly exchange ions and small molecules that help coordinate activities among the cells that make up the tissue.

33

Types of Junctions: Zonula:

either adherens or occuldens variety, Zonula complexes travel all the way around the cell and link all neighboring cells to this central cell. (associated with intracellular actin)

34

Types of junctions: Macula:

"spot" or snap-like junction. Adherens variety and are often referred to as desmosomes (lateral domains of epithelial cells) or hemidesmosomes (basal domain of epithelial cells). Macula are associated with (tonofilaments) intermediate filaments)

35

Cadherin proteins are anchored to cytoplasmic plaques containing:

Desmoplakin, Plakoglobin

36

Zonula and macula adherens are mediated by interations with __________ and __________ cadherins

desmocollins, desmogleins

37

A hemidesmosome consist of

a cytoplasmic plate associated with intermediate filaments such as keratin. A membrance plaque linking it to the basement membrane.

38

Zonula occludens

are tight, belt-like occluding junctions. Provide a great barrier against the paracellular transport pathway. Other transmemebrane proteins include junctional adhesion molecules (JAMs) and Nectin.

39

Nectin:

is associated with the intracellular molecule, afadin

40

JAMs

are associated with both afadin and ZO-1

41

JAMs and Nectin:

are members of the immunoglobulin superfamily. stabilized by disulfide bonds and for cis-homodimers that facilitate cell adhesion.

42

Gap junctions are composed of _____________

Connexons

43

Each connexon, consist of __ __________, formaing a hexagonal structure with a ___________.

6 connexins, hollow center.

44

Gap junctions close when __________ ________ concentrations are high.

calcium Ion