Inbred BALB/c and C57BL/6 mice as well as their F1 hybrids were reared in either an inbred or hybrid maternal environment prenatally and/or postnatally, and were later tested for several behaviours prior to histological study of the brain at 100 days after birth. Whereas measures of spatial memory showed hybrid vigour or overdominance, measures of hippocampal mossy fibres showed intermediate in...

To evaluate several cognitive parameters during the execution of behavioral tasks assessing cognitive function in laboratory animals, the parameters are reported within a range. This situation entails that each laboratory must establish the conditions under which the behavioral task to evaluate the cognitive function can be carried out. C57BL/6 and BALB/c inbred strains are used more often in b...

The genetic control of susceptibility to two species of murine malarial parasites was investigated with recombinant inbred (RI) mouse strains as a model system. Initially, the nonlethal Plasmodium yoelii 17X strain was cloned by limiting dilution to minimize parasite variability. This cloned P. yoelii was used to infect C57BL and BALB/c mice, strains which are the progenitors of the CXB RI stra...

To approach the genetic mechanism that turns off the synthesis of alpha-fetoprotein (AFP) after birth, we assumed that a change in this mechanism might affect the low basal level of AFP that can be detected in the adult organism. The concentration of AFP was therefore determined for serum from adult mice of 27 different inbred strains. With one exception, this basal level was between 34 and 173...

When inbred BALB/c mice were separated from their mother for 24 or 36 hr beginning shortly after birth, growth of the body, whole brain and corpus callosum was almost completely stopped. After being returned to their mother, mice deprived for 24 hr gained weight more slowly than non-deprived littermates over the next 6 days but later showed moderate catch-up growth after weaning at 4 weeks of a...

The AKR mouse strain was developed by selective breeding for a high incidence of spontaneously occurring leukemia, starting from a randombred stock in which the incidence of the disease was low to moderate (1) . The success of the breeding program strongly suggested that genetic factors play a role in the occurrence of the disease . This implication was amply confirmed in studies of crosses bet...

The experimental model of high-dose Leishmania mexicana infection is used frequently to study molecular mechanisms regulating Th2 response since most inbred mice regardless of their genetic background display Th2 cytokine-dependent susceptibility to L. mexicana unlike Leishmania major. Here, we analyzed the course of L. mexicana infection in BALB/c, C57BL/6 and CBA/J mouse strains using low-dos...

A new locus is described that determines an alloantigen on the surface of lymphocytes. It differs from loci previously described in that the corresponding antibody, at least in most antisera, reacts almost exclusively with node lymphocytes, and weakly or not at all with thymuslymphocytes. Positive strains include C57BL/6, C57BL/10, C57L, C57BR/cd, and RF; negative strains include BALB/c, C3H, a...

The susceptibilities of C3H/HeN, BALB/c, and C57BL/6N mouse strains to group B streptococci (GBS) infection were evaluated. C3H/HeN mice developed severe polyarthitis; mild lesions and no lesions were observed in BALB/c and C57BL/6N mice, respectively. A correlation between the severity of arthritis, the number of GBS in the joints, and local interleukin-6 and interleukin-1beta production was e...

Differential thermal nociception across inbred mouse strains has genetic determinants. Thermal nociception is largely attributed to the heat/capsaicin receptor transient receptor potential vanilloid 1 (TRPV1); however, the contribution of this channel to the genetics of thermal nociception has not been revealed. In this study we compared TRPV1 expression levels and electrophysiological properti...