Does meth break male and female prefrontal neurons the same way?
In 94 F344 rats, males and females self-administered similar meth (≈28–29 mg/kg over 21 days) and kept seeking at 30 days, but VGCC calcium spikes fell in males and rose in females after short withdrawal.
Source
Methamphetamine self-administration causes neuronal dysfunction in rat medial prefrontal cortex in a sex-specific and withdrawal time-dependent manner
Study at a glance
- Design
- Animal / in-vitro — F344 rat methamphetamine self-administration with yoked saline, then whole-cell patch of mPFC pyramids after 2–5 d or ≥30 d withdrawal
- N
- N=94 · 94 rats (49 female, 45 male); short-term withdrawal 29F/28M; long-term 20F/17M, with overlapping ephys cells
- Population
- 4–5-month-old male and female F344 rats after 21-day i.v. meth self-administration
- Outcome
- Drug taking/seeking, mPFC pyramidal excitability, and VGCC calcium-spike area/duration by sex and withdrawal time
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Inspect source passages
Does meth break male and female prefrontal neurons the same way?
These passages occur verbatim in the stored paper text. They support the points listed below; they do not verify every statement in the explanation.
94 rats: 49 females and 45 males.
A total of 94 rats were used for this study, comprising 49 females and 45 males
21-day intake was 27.8±2.3 mg/kg (males) vs 29.1±2.1 mg/kg (females).
total Meth intake over the 21-day period did not differ significantly between males (27.8 ± 2.3 mg/kg) and females (29.1 ± 2.1 mg/kg
What they did
Ran 21-day meth self-administration vs saline-yoked controls in male and female rats, tested cue-induced seeking during long withdrawal, and whole-cell patched mPFC pyramids after 2–5 or ≥30 days for firing and VGCC calcium spikes.
What they found
Intake did not differ by sex (27.8±2.3 vs 29.1±2.1 mg/kg). Both sexes showed persistent 30-day seeking. After short withdrawal, male calcium-spike area/duration decreased while female spikes increased (sex×meth p≤0.003).
The limits
What it doesn't show
Rat operant meth is not a clinical trial of gender-specific treatment; overlapping cell counts are small, and mPFC slice physiology does not measure human cognition.
Key terms
- Meth-SA
- Intravenous methamphetamine self-administration in operant chambers.
- mPFC
- Medial prefrontal cortex; source of recorded glutamatergic pyramids.
- Yoked saline
- Control rats receiving saline infusions matched to a meth partner’s timing.
- VGCC
- Voltage-gated calcium channel; source of measured calcium plateau spikes.
- Withdrawal
- Short (2–5 d) vs long (≥30 d) abstinence after 21 days of Meth-SA.
- Drug-seeking
- Active nose-pokes for meth-paired cues without drug delivery.
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Animal N was about:
Common questions
How many rats?
94 (49 female, 45 male).
Did intake differ by sex?
No—about 28 vs 29 mg/kg over 21 days.
Did seeking persist?
Yes, in both sexes across 30-day withdrawal.
How did VGCCs differ?
Males decreased, females increased calcium spikes after short withdrawal.
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