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The formalin test: a dose-response analysis at three developmental stages

Carolyn J Teng¹, Frances V Abbott

¹Department of Psychiatry, McGill University, 1033 Pine Ave. West, Montreal, QC H3A 1A1, Canada.

|August 26, 1998

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Neonatal rat pups show heightened sensitivity to formalin-induced pain, with responses log-linearly related to concentration. Pain processing undergoes significant qualitative changes during nervous system development.

Area of Science:

Neuroscience
Developmental Biology
Pain Research

Background:

Pain perception in developing organisms is not fully understood.
Formalin test is a common model for studying pain and analgesia.

Purpose of the Study:

To investigate the behavioral responses to formalin-induced pain in rat pups at different developmental stages.
To establish quantitative measures of pain in developing rats.

Main Methods:

Intraplantar injection of varying formalin concentrations in rat pups at 3, 15, and 25 days of age.
Time-sampling method to record behavioral responses.
Correlation analysis to assess the relationship between formalin concentration and pain behaviors.

Main Results:

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Pain response was monophasic in 3-day-old pups, persisting for an hour.
Response became monophasic but waned within 30 minutes by day 15.
A biphasic response, similar to adults, emerged by day 25.
Pain sensitivity was approximately 10-fold higher in neonatal rats compared to weanlings.

Conclusions:

Formalin-induced pain response is log-linearly related to concentration across development.
Significant qualitative changes in pain processing occur as the nervous system matures.
Quantitative behavioral measures for studying pain in developing rats were identified.