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Technical details about Prestwick3_000244, learn more about the structure, uses, toxicity, action, side effects and more

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2D Structure
Also known as: 125-84-8, Dl-aminoglutethimide, Cytadren, Orimeten, P-aminoglutethimide, Elipten
Molecular Formula
C13H16N2O2
Molecular Weight
232.28  g/mol
InChI Key
ROBVIMPUHSLWNV-UHFFFAOYSA-N
FDA UNII
0O54ZQ14I9

An aromatase inhibitor that is used in the treatment of advanced BREAST CANCER.
Aminoglutethimide is an Adrenal Steroid Synthesis Inhibitor. The mechanism of action of aminoglutethimide is as an Adrenal Steroid Synthesis Inhibitor.
1 2D Structure

2D Structure

2 Identification
2.1 Computed Descriptors
2.1.1 IUPAC Name
3-(4-aminophenyl)-3-ethylpiperidine-2,6-dione
2.1.2 InChI
InChI=1S/C13H16N2O2/c1-2-13(8-7-11(16)15-12(13)17)9-3-5-10(14)6-4-9/h3-6H,2,7-8,14H2,1H3,(H,15,16,17)
2.1.3 InChI Key
ROBVIMPUHSLWNV-UHFFFAOYSA-N
2.1.4 Canonical SMILES
CCC1(CCC(=O)NC1=O)C2=CC=C(C=C2)N
2.2 Other Identifiers
2.2.1 UNII
0O54ZQ14I9
2.3 Synonyms
2.3.1 MeSH Synonyms

1. Cytadren

2. Orimeten

2.3.2 Depositor-Supplied Synonyms

1. 125-84-8

2. Dl-aminoglutethimide

3. Cytadren

4. Orimeten

5. P-aminoglutethimide

6. Elipten

7. 3-(4-aminophenyl)-3-ethylpiperidine-2,6-dione

8. 3-(4-aminophenyl)-3-ethyl-2,6-piperidinedione

9. 2-(p-aminophenyl)-2-ethylglutarimide

10. Aminoglutetimida

11. 2,6-piperidinedione, 3-(4-aminophenyl)-3-ethyl-

12. Aminoglutethimidum

13. Ba-16038

14. 3-ethyl-3-(p-aminophenyl)-2,6-dioxopiperidine

15. (+/-)-p-aminoglutethimide

16. Nsc-330915

17. Glutethimide, Para-amino

18. Ag-1

19. 3-(4-aminophenyl)-3-ethyl-piperidine-2,6-dione

20. Glutarimide, 2-(p-aminophenyl)-2-ethyl-

21. Mfcd00010122

22. Chembl488

23. Chebi:2654

24. Alpha-(p-aminophenyl)-alpha-ethylglutarimide

25. 0o54zq14i9

26. Dsstox_cid_2589

27. Dsstox_rid_76647

28. .alpha.-(p-aminophenyl)-.alpha.-ethylglutarimide

29. Dsstox_gsid_22589

30. (rs)-2-(4-amino-phenyl)-2-ethyl-glutarimide;(rs)-3-(4-amino-phenyl)-3-ethyl-2,6-dioxo-piperidine

31. Aminoglutethimidum [inn-latin]

32. Aminoglutetimida [inn-spanish]

33. Aminoglutetimide

34. Ba 16038

35. Cytadren (tn)

36. Smr000326785

37. C 16038-ba

38. Ccris 7562

39. Aminoglutethimide (ag)

40. Sr-01000075596

41. 3-(4-aminophenyl)-3-ethyl-2,6-piperidindion

42. Einecs 204-756-4

43. Brn 0210656

44. Aminoglutethimide (usp/inn)

45. Unii-0o54zq14i9

46. Hsdb 7494

47. Aminoglutethimide [usp:inn:ban]

48. Ncgc00016379-01

49. Cas-125-84-8

50. Prestwick_243

51. Spectrum_000040

52. (y)-p-aminoglutethimide

53. Aminoglutethimide Ag, 4

54. Aminoglutethimide- Bio-x

55. (?)-p-aminoglutethimide

56. Prestwick0_000244

57. Prestwick1_000244

58. Prestwick2_000244

59. Prestwick3_000244

60. Spectrum2_000093

61. Spectrum3_000296

62. Spectrum4_000144

63. Spectrum5_000802

64. A 9657

65. Schembl4306

66. Aminoglutethimide (cytadren)

67. Lopac0_000124

68. Bspbio_000028

69. Bspbio_001832

70. Kbiogr_000588

71. Kbioss_000400

72. (a+/-)-p-aminoglutethimide

73. Mls000859924

74. Mls001213216

75. Aminoglutethimide [mi]

76. Divk1c_000884

77. Spectrum1500115

78. Spbio_000046

79. Spbio_002247

80. Aminoglutethimide [inn]

81. Bdbm9460

82. Bpbio1_000032

83. Gtpl7054

84. Aminoglutethimide [hsdb]

85. Dtxsid8022589

86. Aminoglutethimide [vandf]

87. Hms502m06

88. Kbio1_000884

89. Kbio2_000400

90. Kbio2_002968

91. Kbio2_005536

92. Kbio3_001332

93. Aminoglutethimide [mart.]

94. Ninds_000884

95. Aminoglutethimide [who-dd]

96. Hms1568b10

97. Hms1920c09

98. Hms2090i05

99. Hms2091i09

100. Hms2095b10

101. Hms2231m19

102. Hms3259h10

103. Hms3260i10

104. Hms3372m07

105. Hms3655o17

106. Hms3712b10

107. Pharmakon1600-01500115

108. Amy33415

109. Bcp28501

110. Hy-b0237

111. 2, 3-(4-aminophenyl)-3-ethyl-

112. Tox21_110406

113. Tox21_303497

114. Tox21_500124

115. Bbl010961

116. Ccg-38911

117. Nsc330915

118. Nsc755868

119. Stk802074

120. Akos004120070

121. Akos022060651

122. Tox21_110406_1

123. Aminoglutethimide [ep Impurity]

124. Aminoglutethimide [orange Book]

125. Db00357

126. Lp00124

127. Nc00714

128. Nsc 330915

129. Nsc 755868

130. Nsc-755868

131. Pb48252

132. Sdccgsbi-0050112.p005

133. Aminoglutethimide [ep Monograph]

134. Aminoglutethimide [usp Impurity]

135. Idi1_000884

136. Smp1_000017

137. Ncgc00015110-02

138. Ncgc00015110-03

139. Ncgc00015110-04

140. Ncgc00015110-05

141. Ncgc00015110-06

142. Ncgc00015110-07

143. Ncgc00015110-09

144. Ncgc00015110-12

145. Ncgc00015110-21

146. Ncgc00093615-01

147. Ncgc00093615-02

148. Ncgc00093615-03

149. Ncgc00093615-04

150. Ncgc00093615-05

151. Ncgc00257263-01

152. Ncgc00260809-01

153. Ac-12456

154. As-13282

155. Ba164155

156. Nci60_002900

157. Sbi-0050112.p004

158. Db-021640

159. Db-072002

160. Db-072275

161. 3-carboxy-1,1-dimethyl-, (e)-2-propenyl

162. Ab00051935

163. Eu-0100124

164. Ft-0773944

165. S1672

166. Sw196550-3

167. ( Inverted Question Mark)-p-aminoglutethimide

168. En300-53368

169. Vu0243029-3

170. C07617

171. D00574

172. D88489

173. Ab00051935-09

174. Ab00051935-11

175. Ab00051935_12

176. Ab00051935_13

177. 125a848

178. A805433

179. Q241150

180. Sr-01000075596-1

181. Sr-01000075596-4

182. Sr-01000075596-6

183. W-108399

184. Brd-a25234499-001-05-0

185. Brd-a25234499-001-09-2

186. Z1259341083

187. Aminoglutethimide, European Pharmacopoeia (ep) Reference Standard

188. Aminoglutethimide, United States Pharmacopeia (usp) Reference Standard

2.4 Create Date
2005-03-25
3 Chemical and Physical Properties
Molecular Weight 232.28 g/mol
Molecular Formula C13H16N2O2
XLogP31.2
Hydrogen Bond Donor Count2
Hydrogen Bond Acceptor Count3
Rotatable Bond Count2
Exact Mass232.121177757 g/mol
Monoisotopic Mass232.121177757 g/mol
Topological Polar Surface Area72.2 Ų
Heavy Atom Count17
Formal Charge0
Complexity321
Isotope Atom Count0
Defined Atom Stereocenter Count0
Undefined Atom Stereocenter Count1
Defined Bond Stereocenter Count0
Undefined Bond Stereocenter Count0
Covalently Bonded Unit Count1
4 Drug and Medication Information
4.1 Therapeutic Uses

Adrenocortical suppressant; antineoplastic

O'Neil, M.J. (ed.). The Merck Index - An Encyclopedia of Chemicals, Drugs, and Biologicals. Whitehouse Station, NJ: Merck and Co., Inc., 2006., p. 75


Aminoglutethimide is indicated for temporary suppression of adrenal function in selected patients with Cushing's syndrome including that associated withadrenal carcinoma and etopic adrenocorticotropic hormone (ACTH)-producing tumors or adrenal hyperplasia. /Included in US product label/

Thomson.Micromedex. Drug Information for the Health Care Professional. 25th ed. Volume 1. Plus Updates. Content Reviewed by the United States Pharmacopeial Convention, Inc. Greenwood Village, CO. 2005., p. 90


Aminoglutethimide is indicated to produce a "pharmacologic adrenalectomy" in the treatment of post menopausal metastatic breast cancer, especially inoperable or recurrent breast cancer proven to be hormone dependent, but resistant to therapy with tamoxifen. /Included in US product label/

Thomson.Micromedex. Drug Information for the Health Care Professional. 25th ed. Volume 1. Plus Updates. Content Reviewed by the United States Pharmacopeial Convention, Inc. Greenwood Village, CO. 2005., p. 90


Aminoglutethimide is indicated for treatment of prostatic carcinoma unresponsive to hormonal or surgical therapy. /Included in US product label/

Thomson.Micromedex. Drug Information for the Health Care Professional. 25th ed. Volume 1. Plus Updates. Content Reviewed by the United States Pharmacopeial Convention, Inc. Greenwood Village, CO. 2005., p. 90


For more Therapeutic Uses (Complete) data for AMINOGLUTETHIMIDE (7 total), please visit the HSDB record page.


4.2 Drug Warning

Cytadren may cause adrenocortical hypofunction, especially under conditions of stress, such as surgery, trauma, or acute illness. Patients should be carefully monitored and given hydrocortisone and mineralocorticoid supplements as indicated. Dexamethasone should not be used.

Physicians Desk Reference. 53rd ed. Thomson PDR. Montvale, NJ 1999.


Cytadren may also suppress aldosterone production by the adrenal cortex and may cause orthostatic or persistent hypotension. The blood pressure should be monitored in all patients at appropriate intervals. Patients should be advised of the possible occurrence of weakness and dizziness as symptoms of hypotension, and measures to be taken should they occur.

Physicians Desk Reference. 53rd ed. Thomson PDR. Montvale, NJ 1999.


Cytadren can cause fetal harm when administered to a pregnant woman. In the earlier experience with the drug in about 5000 patients, two cases of pseudohermaphroditism were reported in female infants whose mothers were treated with Cytadren ... If this drug must be used during pregnancy, or if the patient becomes pregnant while taking the drug, the patient should be apprised of the potential hazard to the fetus.

Physicians Desk Reference. 53rd ed. Thomson PDR. Montvale, NJ 1999.


Patients should be warned that drowsiness may occur and that they should not drive, operate potentially dangerous machinery, or engage in other activities that may become hazardous because of decreased alertness.

Physicians Desk Reference. 53rd ed. Thomson PDR. Montvale, NJ 1999.


For more Drug Warnings (Complete) data for AMINOGLUTETHIMIDE (19 total), please visit the HSDB record page.


4.3 Drug Indication

For the suppression of adrenal function in selected patients with Cushing's syndrome, malignant neoplasm of the female breast, and carcinoma in situ of the breast.


FDA Label


5 Pharmacology and Biochemistry
5.1 Pharmacology

Aminoglutethimide inhibits the enzymatic conversion of cholesterol to D5-pregnenolone, resulting in a decrease in the production of adrenal glucocorticoids, mineralocorticoids, estrogens, and androgens.


5.2 MeSH Pharmacological Classification

Antineoplastic Agents, Hormonal

Antineoplastic agents that are used to treat hormone-sensitive tumors. Hormone-sensitive tumors may be hormone-dependent, hormone-responsive, or both. A hormone-dependent tumor regresses on removal of the hormonal stimulus, by surgery or pharmacological block. Hormone-responsive tumors may regress when pharmacologic amounts of hormones are administered regardless of whether previous signs of hormone sensitivity were observed. The major hormone-responsive cancers include carcinomas of the breast, prostate, and endometrium; lymphomas; and certain leukemias. (From AMA Drug Evaluations Annual 1994, p2079) (See all compounds classified as Antineoplastic Agents, Hormonal.)


Aromatase Inhibitors

Compounds that inhibit AROMATASE in order to reduce production of estrogenic steroid hormones. (See all compounds classified as Aromatase Inhibitors.)


5.3 FDA Pharmacological Classification
5.3.1 Active Moiety
AMINOGLUTETHIMIDE
5.3.2 FDA UNII
0O54ZQ14I9
5.3.3 Pharmacological Classes
Mechanisms of Action [MoA] - Adrenal Steroid Synthesis Inhibitors
5.4 ATC Code

L - Antineoplastic and immunomodulating agents

L02 - Endocrine therapy

L02B - Hormone antagonists and related agents

L02BG - Aromatase inhibitors

L02BG01 - Aminoglutethimide


5.5 Absorption, Distribution and Excretion

Absorption

Rapidly and completely absorbed from gastrointestinal tract. The bioavailability of tablets is equivalent to equal doses given as a solution.


Route of Elimination

After ingestion of a single oral dose, 34%-54% is excreted in the urine as unchanged drug during the first 48 hours, and an additional fraction as the N-acetyl derivative.


Cytadren is rapidly and completely absorbed after oral administration. In 6 healthy male volunteers, maximum plasma levels of Cytadren averaged 5.9 ug/mL at a medium of 1.5 hours after ingestion of 250 mg tablets. The bioavailability of tablets is equivalent to equal doses given as a solution.

Physicians Desk Reference. 53rd ed. Thomson PDR. Montvale, NJ 1999.


Aminoglutethimide crosses the placenta ...

Thomson.Micromedex. Drug Information for the Health Care Professional. 25th ed. Volume 1. Plus Updates. Content Reviewed by the United States Pharmacopeial Convention, Inc. Greenwood Village, CO. 2005., p. 91


It is not known weather aminoglutethimide is distributed into breast milk.

Thomson.Micromedex. Drug Information for the Health Care Professional. 25th ed. Volume 1. Plus Updates. Content Reviewed by the United States Pharmacopeial Convention, Inc. Greenwood Village, CO. 2005., p. 91


After ingestion of a single oral dose, 34% to 54% is excreted in the urine as unchanged drug during the first 48 hours, and an additional fraction as the N-acetyl derivative.

Physicians Desk Reference. 53rd ed. Thomson PDR. Montvale, NJ 1999.


For more Absorption, Distribution and Excretion (Complete) data for AMINOGLUTETHIMIDE (7 total), please visit the HSDB record page.


5.6 Metabolism/Metabolites

Hepatic. 34-54% of the administered dose is excreted in the urine as unchanged drug during the first 48 hours, and an additional fraction as an N-acetyl derivative.


Hepatic; the major metabolite is N-acetylaminoglutethimide; there may be genetic variation among individuals in the rate of acetylation.

Thomson.Micromedex. Drug Information for the Health Care Professional. 25th ed. Volume 1. Plus Updates. Content Reviewed by the United States Pharmacopeial Convention, Inc. Greenwood Village, CO. 2005., p. 90


Four ... metabolites of aminoglutethimide have been identified in the urine of patients being treated chronically with the drug. These were products of hydroxylation of the 3-ethylpiperidine-2,6-dione residue, namely 3-(4-aminophenyl)-3-ethyl-5-hydroxypiperidine-2,6-dione and its acetylamino analog, 3-(4-aminophenyl)-3-(1-hydroxyethyl)piperidine-2,6-dione, and 3-(4-aminophenyl)-3-(2-carboxamidoethyl)tetrahydrofuran-2-one, the lactone formed by rearrangement of 3-(4-aminophenyl)-3-(2-hydroxyethyl)piperidine-2,6-dione. ... These new metabolites were minor constituents compared with aminoglutethimide and with the previously identified major metabolites 3-(4-acetylaminophenyl)-3-ethylpiperidine-2,6-dione and 3-(4-hydroxylaminophenyl)-3-ethylpiperidine-2,6-dione. There were marked species differences between rat and human inasmuch as almost all the metabolites in the urine of the rat were N-acetylated whereas most of the human metabolites were not. However, 5-hydroxylation of the piperidinedione residue was stereoselective in the same sense in both species, the cis isomer being formed exclusively. Synthetic cis-3-(4-aminophenyl)-3-ethyl-5-hydroxypiperidine-2,6-dione did not inhibit the activity of the target enzyme systems desmolase and aromatase in vitro, and therefore, like other metabolites so far described, is an inactivation product of the drug.

PMID:6148221 Foster A et al; Drug Metab Dispos 12 (4): 511-6 (1984)


Hydroxylaminoglutethimide (3-ethyl-3-(4-hydroxylaminophenyl)-2,6-piperidinedione) has been identified as a novel metabolite of aminoglutethimide (3-(4-aminophenyl)-3-ethyl-2,6-piperidinedione) in the urine of patients treated chronically with this drug. The metabolite was isolated by reverse-phase thin-layer chromatography, and characterized by comparison of its mass spectrum and chromatographic properties with those of the synthetic compound. Hydroxylaminoglutethimide is unstable; it is readily oxidized to nitrosoglutethimide and disproportionates in the mass spectrometer into this compound and aminoglutethimide. In none of four patients studied was the metabolite detected in the urine after the first dose of the drug. In one patient it appeared after the second dose and in two more within seven to eight days suggesting that its formation is drug-induced, and that it may be the metabolite responsible for the diminished half-life of aminoglutethimide during chronic therapy. The profile of metabolites from one patient, examined by high-performance liquid chromatography after the first dose and again after six weeks of therapy afforded evidence that the formation of hydroxylaminoglutethimide was at the expense of a major metabolite N-acetylaminoglutethimide.

PMID:6689274 Jarman M et al; Biomed Mass Spectrom 10 (11): 620-5 (1983)


Hydroxylaminoglutethimide [3-ethyl-3-(4-hydroxylaminophenyl)piperidine-2,6-dione] (HxAG), aminoglutethimide [3-(4-aminophenyl)-3-ethylpiperidine-2,6-dione] (AG) and N-acetyl-aminoglutethimide (N-AcAG) have been quantified by high performance liquid chromatography using m-aminoglutethimide (metaAG) as the internal standard in serial 24 hr urine collections from a patient on chronic AG therapy without steroid supplementation. HxAG is the product of a major AG-induced metabolic pathway since the ratio [HxAG]/[AG] rises with time. In contrast the ratio [N-AcAG]/[AG] decreases with time. A rapid, simple colorimetric assay has been used to quantify HxAG in urine from both male and female patients receiving a range of doses of AG and to show that induced metabolism is a general phenomenon even at low doses (125 mg twice daily).

PMID:3838134 Full text: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1977034 Goss P et al; Br J Cancer 51 (2):259-62 (1985)


Extensive metabolism occurred in all species, with N-acetylaminoglutethimide being the major metabolite except for dog and man. In the latter two species unchanged drug was the main product excreted. A metabolite, 3-(4-acetamidophenyl)-3-(2-carboxamidoethyl)tetrahydrofuran-2-one, not previously found in human urine, was identified. Chronic administration of aminoglutethimide to rats produced no detectable change in the excretory or metabolite patterns of the drug. However chronic administration of phenobarbitone decreased the urinary excretion of (14)C over a 72 hr period. Residual (72 hr) tissue levels of (14)C were less than 1 microgram equivalent of (14)C-aminoglutethimide/g tissue in the rat, guinea-pig and rabbit. Dog tissues retained a considerable quantity of (14)C at this time.

PMID:3354234 Dalrymple P et al; Xenobiotica 18 (1): 75-81(1988)


5.7 Biological Half-Life

12.5 ± 1.6 hours


12.5 hours; reduced to 7 hours after prolonged (2 to 32 weeks) treatment because aminoglutethimide induces hepatic enzymes and accelerates its own metabolism.

Thomson.Micromedex. Drug Information for the Health Care Professional. 25th ed. Volume 1. Plus Updates. Content Reviewed by the United States Pharmacopeial Convention, Inc. Greenwood Village, CO. 2005., p. 90


5.8 Mechanism of Action

Aminoglutethimide reduces the production of D5-pregnenolone and blocks several other steps in steroid synthesis, including the C-11, C-18, and C-21 hydroxylations and the hydroxylations required for the aromatization of androgens to estrogens, mediated through the binding of aminoglutethimide to cytochrome P-450 complexes. Specifically, the drug binds to and inhibits aromatase which is essential for the generation of estrogens from androstenedione and testosterone. A decrease in adrenal secretion of cortisol is followed by an increased secretion of pituitary adrenocorticotropic hormone (ACTH), which will overcome the blockade of adrenocortical steroid synthesis by aminoglutethimide. The compensatory increase in ACTH secretion can be suppressed by the simultaneous administration of hydrocortisone. Since aminoglutethimide increases the rate of metabolism of dexamethasone but not that of hydrocortisone, the latter is preferred as the adrenal glucocorticoid replacement. Although aminoglutethimide inhibits the synthesis of thyroxine by the thyroid gland, the compensatory increase in thyroid-stimulating hormone (TSH) is frequently of sufficient magnitude to overcome the inhibition of thyroid synthesis due to aminoglutethimide. In spite of an increase in TSH, aminoglutethimide has not been associated with increased prolactin secretion.


Aminoglutethimide produces suppression of the adrenal cortex by inhibiting enzyme conversion of cholesterol to pregnenolone, thus blocking synthesis of adrenal steroid; it may also affect other steps in the synthesis and metabolism of these steroids. A compensatory increase in secretion of adrenocorticotropic hormone (ACTH by the pituitary occurs (except in patients with ACTH-independent adenomas or carcinomas), necessitating glucocorticoid administration to maintain aminoglutethimide's effect. Aminoglutethimide also inhibits estrogen production from androgens in peripheral tissues by blocking the aromatase enzyme. An additional mechanism in breast cancer, involving enhanced metabolism of estrone sulfate, has also been proposed.

Thomson.Micromedex. Drug Information for the Health Care Professional. 25th ed. Volume 1. Plus Updates. Content Reviewed by the United States Pharmacopeial Convention, Inc. Greenwood Village, CO. 2005., p. 90


Cytadren blocks several other steps in steroid synthesis, including the C11, C18, and C21 hydroxylations and the hydroxylations required for the aromatization of androgens to estrogens, mediated through binding of Cytadren to cytochrome complexes.

Physicians Desk Reference. 53rd ed. Thomson PDR. Montvale, NJ 1999.


Although Cytadren inhibits the synthesis of thyroxine by the thyroid gland, the compensatory increase in thyroid stimulating hormone (TSH) is frequently sufficient magnitude to overcome the inhibition of thyroid synthesis due to Cytadren. In spite of an increase of TSH, Cytadren has not been associated with increased prolactin secretion.

Physicians Desk Reference. 53rd ed. Thomson PDR. Montvale, NJ 1999.


In this small study, the effect of aminoglutethimide on the disposition of estrogens in women with advanced breast cancer was investigated using bolus injections of 4-(14)C-estradiol and 6,7-(3)H-estrone sulfate, alone or in combination. No alterations in estrogen disposition were seen after short term (6 hours) aminoglutethimide administration. During long term (3 weeks to 8 months) aminoglutethimide treatment mean 4-(14)C-estradiol clearance was not changed. (14)C-Estrone sulfate AUC was reduced by 43% at a low dose of aminoglutethimide (125 mg twice daily) and by 65% at a high dose (250 mg 4 times daily) with hydrocortisone acetate 25 mg twice daily. The estrone sulfate terminal elimination rate constant (lambda z) was concurrently increased (mean of 46 and 79%, respectively, with the 2 dosage regimens). A possible increase in estrone sulfate clearance during long term treatment was tested for by injecting 6,7-(3)H-estrone sulfate. These studies revealed a marked increase (mean 104%) in estrone sulfate clearance in patients receiving the high dose aminoglutethimide schedule. Following injection of 4-(14)C-estradiol plus 6,7-(3)H-estrone sulfate, the fraction of 4-(14)C-estradiol metabolized to estrone sulfate was found to be reduced in all patients (mean 13%). A mean increase of 80% in the urinary excretion of (14)C-estriol was observed after 4-(14)C-estradiol administration.

PMID:3436111 Lonning PE et al; Clin Pharmacokinet 13 (6): 393-406 (1987)


Aminoglutethimide (AMG), a potent inhibitor of steroidogenesis used in the treatment of breast cancer and some adrenal pathologies, abolished the induction of ornithine decarboxylase (ODC) elicited by peptide hormones and by dibutyryl-cAMP in steroidogenic tissues. This effect seems to be related to an inhibition of cAMP-dependent protein kinase (IC50 = 287 uM) rather than blockade of the steroidogenic pathway. This inhibition may explain some of the effects observed in AMG treatment which cannot be ascribed to its direct effect on the cytochrome P450scc complex or aromatase. Taking into account that ODC, the rate-limiting enzyme in polyamine synthesis, is elevated in many types of cancer and that overexpression of this enzyme is associated with cell transformation, one may speculate that the inhibitory action of AMG on protein kinase A represents a positive colateral effect of this drug in cancer therapy.

PMID:11178987 Bastida CM et al; Biochem Biophys Res Commun 281 (1): 244-8 (2001)


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