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BUY NOWHow Lithium Salts Help Rats Cope With Stress
A preclinical study in rats showed that lithium salts affect rats’ behavior under stress differently. Organic lithium salts showed better results than the inorganic salt tested. Learn how the experiment was done and which lithium salt appeared to be the most effective.
What Lithium Salts Were Used In The Experiment?
Inorganic lithium salts have a limited ability to interact with proteins. Because of this, lithium transport into cells may be less efficient. In contrast, organic lithium salts may interact more specifically with proteins, resulting in more efficient transport of lithium into cells.
In the study, the following lithium salts were compared:
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Lithium carbonate (inorganic)
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Lithium succinate (organic)
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Lithium ascorbate (organic)
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Lithium orotate (organic)
How The Experiment Was Done? The Open Field Test
To observe and measure these behaviors in control and treatment groups, scientists used the Open Field test. Rats were exposed to a large square area with holes, or nooks, they could explore.
A rat that feels stressed or uncertain:
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Stays close to the walls.
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Moves less.
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Grooms more.
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Defecates more frequently.
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Avoids the center of the arena.
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Avoids exploring nooks.
A rat that adapts better to the new environment is more likely to:
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Explore.
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Move around,
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Stand on its hind legs.
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Sniff and head-dip into nooks.
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Enter the central area.
Measures of how many times rats expressed one of these behaviors were used as indirect signs of locomotor activity, curiosity, emotional tension, and anxiety-like behavior.
Stress can also reduce weight gain or cause weight loss. The study tracked body weight before and after the treatment administration period.
What Were The Results?
The study included 60 rats, with 10 rats in each group. Four treatment groups received 10 mg/kg of one of the lithium salts for 7 days and were exposed to handling stress. Another group was a control group that received physiological saline and was also exposed to stress. The last group was intact and was not exposed to the same stressors.
|
Groups |
Weight gain, % |
Number of squares entered |
Number of rearings |
Holes explored |
Crossings of the center |
Grooming |
Defecation |
|
Control |
-0.1 |
23.1 |
5.4 |
4.8 |
0 |
7.6 |
2.2 |
|
Intact |
1.3 |
27.0 |
7.2 |
6.6 |
1.1 |
6.8 |
1.8 |
|
Lithium carbonate |
0.7 |
23.6 |
5.4 |
4.7 |
0 |
7.2 |
2.1 |
|
Lithium succinate |
2.4 |
29.7 |
10.9 |
7.3 |
2.7 |
3.5 |
1.0 |
|
Lithium ascorbate |
3.2 |
29.4 |
10.3 |
7.6 |
2.1 |
3.5 |
1.1 |
|
Lithium orotate |
16.4 |
29.1 |
9.8 |
7.1 |
2.0 |
3.7 |
1.1 |
For behavioral outcomes, lithium succinate and lithium ascorbate showed strong results, closely followed by lithium orotate. The least effective salt was inorganic lithium carbonate.
Among the organic salts, lithium orotate showed the highest weight gain of 16.4%, compared with 1.3% in the intact group and a 0.1% loss in the control group.
What Was The Effect of Inorganic Lithium Carbonate?
Lithium carbonate did not noticeably improve the rats’ behavior compared with the control group. These rats showed low exploratory activity and behaved similarly to stressed control animals. Rats given lithium carbonate gained 0.7% body weight.
What Happened To Rats On Organic Lithium Salts?
The rats that received lithium succinate, lithium ascorbate, or lithium orotate behaved more actively in the Open Field test.
They crossed more squares, stood upright more often, explored more holes, and entered the center of the arena more frequently. These behaviors suggest stronger exploratory activity and better adaptation to the unfamiliar space.
The rats also showed fewer signs linked to emotional tension. For example, grooming and defecation decreased in the groups receiving organic lithium salts, which the researchers interpreted as a reduction in emotional stress response.
The rats given organic lithium salts gained from 2.4% to 16.4% body weight. Control rats lost 0.1% of body weight, while intact rats gained 1.3%.
Overall, the study suggests that the form of lithium matters. In this rat model, organic lithium salts were linked to more active exploration, fewer stress-related behaviors, and better body-weight gain than lithium carbonate. These findings are promising for understanding stress adaptation in animals, but they should be interpreted as preclinical results rather than direct evidence for effects in humans.
Scientific Source
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Comparative Analysis of the Stress-Protective Effects of Lithium Salts in the Open Field Test, Deltsov & Pozyabin