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Reply to Schmidt et al.: The long and the short of BAG1

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Schmidt et al. (1) have raised an important point, and we arepleased to be able to respond and provide clarification. Theysuggest that the BAG1S form (which was overexpressed inthese mice) does not inhibit glucocorticoid receptors (GRs)and that the phenotypes that we observe in our BAG1-overexpressingmice (2) are thus not likely to be correlated to adisturbed GR and stress system. Below we cite evidence tosupport our article’s assertion. Kanelakis et al. (3) found thatoverexpressed BAG1S was able to inhibit GR function dependingon the ratio of BAG1S proteins to Hsp70/Hsc70. BecauseBAG1 was overexpressed in our mice, it may be continuouslybound to Hsp70 and thus able to block GR function(3). Furthermore, Schneikert et al. in a paper cited by theauthors (4) discuss whether BAG1 may have different effectson hormone binding by GRs due to differences in the ratio ofBAG1 proteins to Hsp70/Hsc70. Clearly, this may be the casefor BAG1-overexpressing mice. Second, BAG1S may competewith common targets for BAG1M and BAG1L, thus freeingthese isoforms to inhibit GR function. Third, BAG1S maydirectly interact with the Hsp70, Hsp90, p60/Hop, Hsp-40-GRcomplex at high concentrations and inhibit GR function.Given that BAG1’s regulation of GRs is still being elucidated,it seems unreasonable to rule out a potential role for BAG1Sin disrupting the GR and stress system. However, we appreciatethe comments by Schmidt et al. (1), which help illuminatethis issue and highlight topics for continuing research.

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