Cells communicate with each other through direct contact with other cells or from a distance via chemical signaling Stages of cell signaling 3 steps Cells communicate by celltocell contact Immune cells interact by cellcell contact antigenpresenting cells APCs helper Tcells and kill ID: 579502
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Slide1
Essential knowledge 3.D.2:
Cells communicate with each other through direct contact with other cells or from a distance via chemical signaling.Slide2
Stages of cell
signaling (3 steps)Slide3
Cells communicate by cell-to-cell contact
Immune cells interact by cell-cell contact, antigen-presenting cells (APCs), helper T-cells and killer T-cells. Slide4
Cell to cell communication:
Plasmodesmata
between plant cells that allow material to be transported from cell to cell.Slide5
Cells communicate over short distances by using local regulators that target cells in the vicinity of the emitting cell.
Examples:
• Neurotransmitters
• Plant immune response
Ubiquitination
is a central role in cell signaling that regulates several processes including protein degradation and immunological response.
[19]
Much of the defense in plants relies on the destruction of defective or invaded materials within the cell, increasing the importance of functional
proteasomes
and protein targeting.Slide6
Other examples of short distance communication
Quorum sensing in bacteria
http://www.ted.com/talks/bonnie_bassler_on_how_bacteria_communicate.htmlSlide7
Other examples of short distance communication
•
Morphogens
in embryonic development -
Morphogens
are soluble molecules that can diffuse and carry signals that control cell differentiation decisions in a concentration-dependent fashion.
Morphogens typically act through binding to specific protein
receptors. Slide8
Quorum sensing in bacteria
Quorum sensing
is a system of stimulus and response correlated to population density.
Used to coordinate gene expression according to the density of their local population.
Bacteria use it to coordinate certain behaviors based on the local density of the bacterial population.Slide9Slide10
Signals released by one cell type can travel long distances to target cells of another cell type.
Endocrine signals are produced by endocrine cells that release signaling molecules, which are specific and can travel long distances through the blood to reach all parts of the body.
Example 1: InsulinSlide11
Signals released by one cell type can travel long distances to target cells of another cell type.
Example 2: Human growth hormone
HGH, produced by the pituitary gland, spurs growth in children and adolescents.
Example 3: Thyroid HormoneSlide12
Goiter
If there is a deficiency of dietary iodine, the thyroid will not be able to make thyroid hormone. The lack of thyroid hormone will lead to decreased negative feedback on the pituitary, leading to increased production of thyroid-stimulating hormone, which causes the thyroid to enlarge (the resulting medical condition is called
endemic colloid goiterSlide13
JokesSlide14Slide15Slide16
The manliest pic
you will see all day.Slide17Slide18
Dream the impossible dream!Slide19
HANG ON A SEC
I’m textingSlide20Slide21Slide22Slide23Slide24