Inhibition of suckling-induced milk ejections in the lactating rat by delta 9-tetrahydrocannabinol.

Abstract:

:The effect of delta 9-tetrahydrocannabinol (THC) on suckling-induced oxytocin release was investigated by recording intramammary pressure changes in suckled rats treated iv with THC (0.5 mg/kg BW) or vehicle. Latency to the first posttreatment milk ejection and posttreatment milk ejection intervals and pressure wave amplitudes were compared between THC- and vehicle-treated rats. Before treatment, intervals between milk ejections averaged 6.5 +/- 1.3 (+/- SE) and 7.0 +/- 0.7 min for vehicle- and THC-treated groups, respectively. Vehicle injections did not alter the frequency of milk ejections, which continued at an overall mean interval of 7.6 +/- 0.7 min after treatment. In contrast, THC treatment was followed by a transient suspension of milk ejections, with a latency of 59.3 +/- 7.4 min before the first posttreatment milk ejection was recorded (P less than 0.001). Intervals between subsequent ejections averaged 15.3 +/- 2.0 to 16.1 +/- 1.3 min and were lengthened relative to corresponding intervals in vehicle-treated animals (P less than 0.05). The amplitudes of pressure waves were not significantly affected by treatment. Oxytocin (0.5 mU) injections 10 or 30 min after THC treatment evoked abrupt increases in intramammary pressure, indicating continued responsiveness of the mammary gland to oxytocin stimulation. These data suggest that THC interferes with the release of oxytocin in response to suckling. To our knowledge, this provides the first evidence that THC inhibits posterior pituitary function.

journal_name

Endocrinology

journal_title

Endocrinology

authors

Tyrey L,Murphy LL

doi

10.1210/endo-123-1-469

subject

Has Abstract

pub_date

1988-07-01 00:00:00

pages

469-72

issue

1

eissn

0013-7227

issn

1945-7170

journal_volume

123

pub_type

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