Differential effects of tianeptine on the dorsal hippocampal volume of rats submitted to maternal separation followed by chronic unpredictable stress in adulthood

被引:2
|
作者
Pollano, Antonella [1 ]
Zalosnik, Maria I. [1 ]
Durando, Patricia E. [1 ]
Suarez, Marta M. [1 ]
机构
[1] Univ Nacl Cordoba, Fac Ciencias Exactas Fis & Nat, Lab Fisiol Anim, Ave Velez Sarsfield 299, RA-5000 Cordoba, Argentina
来源
STRESS-THE INTERNATIONAL JOURNAL ON THE BIOLOGY OF STRESS | 2016年 / 19卷 / 06期
关键词
Antidepressant; early stress; fear conditioning test; freezing behavior; hippocampal volume; stereology; EARLY-LIFE STRESS; ENVIRONMENTAL ENRICHMENT; ANTIDEPRESSANT TREATMENT; MOLECULAR-MECHANISMS; MISMATCH HYPOTHESIS; RECEPTOR EXPRESSION; CELL-PROLIFERATION; PREFRONTAL CORTEX; NEONATAL STRESS; SPATIAL MEMORY;
D O I
10.1080/10253890.2016.1224842
中图分类号
B84 [心理学]; C [社会科学总论]; Q98 [人类学];
学科分类号
03 ; 0303 ; 030303 ; 04 ; 0402 ;
摘要
Early maternal separation (MS) may produce lasting effects in the dorsal hippocampus (DH) that can change its response to chronic stress in adulthood. Chronic stress affects DH morphology and function, but tianeptine (an anti-depressant) can reverse the stress-induced morphological impairments. Morphologic alterations of hippocampus can affect contextual memory. Therefore, we evaluated the effect of tianeptine in MS and chronically stressed rats on: 1) volume of the DH and its areas using stereology and 2) hippocampal-dependent memory using a fear conditioning test. Male Wistar rats were subjected to daily MS for 4.5 h between postnatal days (PND) 1-21, or to animal facility rearing (AFR). Between (PND) days 50 and 74, rats were exposed to chronic unpredictable stress and were treated daily with tianeptine (10 mg/kg) or vehicle, providing eight groups: AFR-unstressed/vehicle (n = 5 for stereology, n = 18 for fear conditioning test); AFR unstressed/tianeptine (n = 6 and n = 10); AFR-chronic stress/vehicle (n = 6 and n = 14); AFR-chronic stress/tianeptine (n = 6 and n = 10), MS-unstressed/vehicle (n = 5 and n = 19), MS-unstressed/tianeptine (n = 6 and n = 10), MS-chronic stress/vehicle (n = 6 and n = 18), and MS-chronic stress/tianeptine (n = 6 and n = 10). MS-chronic stress/tianeptine rats showed a diminished CA1 area than the corresponding MS-unstressed/tianeptine rats. The combination of stressors produced a freezing response similar to those of the control group during postconditioning. During retrieval, MS led to a diminished freezing response compared to the AFR-unstressed groups. Tianeptine had no effect on freezing behavior. Our results show that tianeptine can affect the CA1 area volume differently depending on the nature and quantity of stressors but cannot alter freezing to context.
引用
收藏
页码:599 / 608
页数:10
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