Relative expression of mRNA for the somatostatin receptors in the caudate putamen of C57BL/6J and 129P3/J mice: strain and heroin effects.
Using real time qPCR, we examined the expression of mRNAs for the five somatostatin receptors (SSTRs) in the caudate putamen of male C57BL/6J and 129P3/J mice. Animals were exposed to multiple injections of heroin, or saline, in the setting of a conditioned place preference study. The relative expression levels of the five SSTR mRNAs differed between the two strains. In both strains, SSTR-1 mRNA was expressed at the highest levels and SSTR-5 at the lowest. Interestingly, in 129P3/J mice SSTR-3 mRNA was not detected in the caudate putamen. We confirmed this finding in the frontal cortex, hypothalamus, nucleus accumbens and a region containing the substantia nigra and ventral tegmental area. We also found strain differences in the mRNA levels of SSTR-2 and -4. Intermittent heroin administration had a dose-dependent effect on the levels of SSTR-1 and -3 mRNAs. These results demonstrate strain differences in the expression of specific mRNAs and a heroin-induced dose-dependent elevation of SSTR-1 and -3 mRNAs in the mouse caudate putamen.
Schlussman
Stefan D
SD
The Laboratory of the Biology of Addictive Diseases, The Rockefeller University, New York, NY 10065, USA. schluss@rockefeller.edu
Cassin
Jared
J
Levran
Orna
O
Zhang
Yong
Y
Ho
Ann
A
Kreek
Mary Jeanne
MJ
D000818:Animals; D001921:Brain / Q000187:drug effects / Q000378:metabolism; D002421:Caudate Nucleus / Q000187:drug effects / Q000378:metabolism; D003214:Conditioning, Classical / Q000187:drug effects / Q000502:physiology; D004305:Dose-Response Relationship, Drug; D003932:Heroin / Q000008:administration & dosage / Q000494:pharmacology*; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D009294:Narcotics / Q000008:administration & dosage / Q000494:pharmacology*; D017072:Neostriatum / Q000187:drug effects* / Q000378:metabolism*; D011699:Putamen / Q000187:drug effects / Q000378:metabolism; D012333:RNA, Messenger / Q000378:metabolism; D011897:Random Allocation; D017481:Receptors, Somatostatin / Q000378:metabolism*; D013028:Space Perception / Q000187:drug effects / Q000502:physiology; D013045:Species Specificity
D009294:Narcotics; D012333:RNA, Messenger; D017481:Receptors, Somatostatin; D003932:Heroin