Consistent with the uptake defect, proteoglycan undersulfation was observed also in the growth plate of homozygous mutant mice, causing altered histomorphometric parameters, reduced chondrocyte proliferation, and altered Ihh signaling pathway [6].
Moreover, accumulation of SM and its derivative sphingosine also occurs at the presynaptic membranes of mutant mice causing alterations in synaptic vesicle docking and presynaptic plasticity events (Camoletto et al, 2009).
This may also explain why high TSLP levels in fetal or neonatal Notch mutant mice cause a B-LPD [13], while the effect on B cells in adult mice is less dramatic.
Tet2-deficiency in mutant mice causes myeloproliferation, suggesting a role in stem cell function [ 15].
This has been shown through studies where the lack of synapse-anchored ribbons in mutant mice causes reduction in exocytosis and degrades precise action potential onset-timing in the auditory nerve [ 5].
Similarly, the D1CT mutant mouse, caused by transgenic potentiation of D1-associated brain circuits, shows OCD-like persistence of grooming, as well as persistence of other behaviors such as digging, climbing, and tics [ 3, 53- 57].
For example, the ability to complete syntactic grooming chains is impaired in several types of mutant mouse, caused by either a knockout of D1 dopamine receptors [ 41], or by a Weaver gene mutation that alters the nigrostriatal dopamine system [ 65, 66].
Consistently, Nakanishi et al. [ 41] have reported very recently that genetic deletion of mPGES-1 in Apc-mutant mice caused marked and persistent suppression of intestinal cancer growth in association with a disorganized vascular pattern.
Various Hr mutant mice have been studied to understand the function of HR, and most Hr mutant mice are created by causing the loss of HR function in their cells, giving them a typical phenotype with a recessive inheritance mode [ 7- 14].
Similarly, stereotaxic injections of fibrillar preparations of Aβ42 into the hippocampus and somatosensory cortex of P301L tau mutant pR5 mice caused a 5-fold induction of NFTs in the amygdala, a site which projects to the CA1 neurons in the hippocampus (Götz et al., 2001b).
These results demonstrate that the decreased fibrosis seen in mutant mice is caused directly by the increase in IL-10.
