Group 3 Mast cell deficient mice models
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Transcript of Group 3 Mast cell deficient mice models
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Group 3
Mast cell deficient mice models
COST action BM1007 Training
school Jerusalem
January 2014
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MC reaction
yesyesKit+/+MZ
nonoKitW/KitW-v
MZ
?yesMZ
• no mast cells• no melanocytes• lack in γδ T cells• anemic• neutropenia• sterile
WBB6F1-KitW/KitW-v
MZ
yes, but deficient
The Kit-deficient mouse models for mast cell research
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The Kit-deficient mouse models for mast cell research
MC reaction
yesyesKit+/+
MZ
nonoKitsh/Kitsh
MZ
?yesMZ
•no mast cells•no melanocytes• neutrophilia• splenomegaly
C57B6-Kitsh/Kitsh (sash)
MZ
yes, but deficient
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Types Available background Mechanism MC
affectedType of MC deficiency Treatment Gene Systemic
abnormalitiesCellular
abnormalitiesGeneral
disadventagesLevel of
defficiencyRestoring Phenotype
Mcpt5-Cre; iDTR C57/BL6
DT mediated depletion of
MCPT5 expressing cells.
CTMC Inducible Injection of DT MCPT5
Side effects after injection of DT (Local
and systemic DT injection)
No report about Basophil numbers in
PBMCs
Destruction of the local tissue due to
injection of DTaround 2,5% ear
skin Time: 3 weeks
Mcpt5-Cre; R-DTA C57/BL6
DT mediated depletion of
MCPT5 expressing cells.
CTMC Constitutive - MCPT5 ? ? ? around 3,5 ear skin and 11% in the back and abdominal skin
Reconstitution???
Mas-TRECK C57/BL6
DT mediated depletion of cells
that employ IE enhancer element
to express IL-4.
MTMC/ CTMC Inducible Injection of
DTIE enhancer
element of IL-4 gene
Side effects after injection of DT (250 ng
I.P. 5 before experiment)
Basophils are also depleted. Is that really
specific of that cell types in chronic
conditions?? Total depletion Time: 18 days
Cre-Master Cpa3Cre+/ C57/BL6
Depletion mediated by toxic
effects of Cre under the control
of Cpa3
MTMC/ CTMC Constitutive - Cpa3 - Basophils reduction
around 40% ? Total depletion Reconstitution
Hello KittyCpa3-Cre; Mcl-1fl/fl
C57/BL6
Depletion by Mcl-1 mediated
induced by Cre expression under
the control of Cpa3 promoter
MTMC/ CTMC Constitutive - Cpa3 macrocytic anemia
Basophils reduction around 40%, neutrophilia
? 92 to 100% Reconstitution
Available Kit-independent MC-deficient mouse models
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Selective ablation of mast cells or basophils reduces peanut-induced anaphylaxis in mice
REBER, L. L., ET AL .CLINICAL AND TRANSLATIONAL ALLERGY (2013)
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KitW-sh/W-sh neutrophil depleted- KitW-
sh/W-sh
Mcpt5-Cre+;iDTR+
Mast cell deficient mice models
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Basophil deficient mice models
Mcpt8DTR/+Ba10336 antibody
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Cpa3-Cre;Mcl-1fl/fl
Mast cell and basophil deficient mice models
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Cre-Mediated Cell Ablation Contests Mast Cell Contribution in Models of Antibody andT Cell-Mediated Autoimmunity
FEYERABEND, THORSTEN B., ET AL .IMMUNITY (2011)
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Nippostrongylus brasiliensis
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Antibody-Induced Arthritis
Encephalomyelitis
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Mast Cells Are Key Promoters of Contact Allergy that Mediate the Adjuvant Effects of Haptens
DUDECK, ANNE, ET AL .IMMUNITY 34.6 (2011)
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Mcpt5-Cre+;iDTR+ Mcpt5-Cre+R-DTA+
KitW/Wv KitW-sh/W-sh KitW-sh/W-sh neutrophil depleted
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Summary
KitW/W-v
KitW-sh/W-sh
Kit dependent mutants Kit independent mutants
Mcpt5-Cre;R-DTA/iDTR
“Cre-Master”Cpa3Cre/+
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Conclusions No model is perfect !
Kit dependent mutants Kit independent mutants
Non specific immune effects
Compensation effect
Variable results depending on different animal strains/models, protocols, disease model etc.
Possible effects on other cells Effects of apoptosis Breeding / economical Compensation effect
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“ Based on the results obtained so far with both the older and newer models for MC research, we think that the most robust conclusions about what MCs can do (or don’t do) in various biological responses in vivo, and regarding the importance of such MC contributions, are likely to be derived from investigations that employ multiple informative model systems. This approach increases the cost of such work, but permits one to exploit the attractive features of the various models while keeping in mind the known and potential limitations in each of them. “
Reber, Marichal and Galli, 2012
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But still…
Results obtained so far – Valuable information
Availability / cost effective
Take home message: always ask the right question!
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