Janet P. Hapgood

Cape Town, WC, South Africa

Last Updated: 09/26/2026

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Found 44 publications

Injectable contraceptives differentially affect the hypothalamic-pituitary-gonadal axis and amenorrhea incidence†.

Injectable contraceptives differentially affect the hypothalamic-pituitary-gonadal axis and amenorrhea incidence†.

Journal: Biology of reproduction
Published: July 31, 2025

Injectable contraceptives differentially affect the hypothalamic-pituitary-gonadal axis and amenorrhea incidence†.

Injectable contraceptives differentially affect the hypothalamic-pituitary-gonadal axis and amenorrhea incidence†.

Journal: Biology of reproduction
Published: July 31, 2025

Serum norethisterone (NET) levels in NET-enanthate (NET-EN) injectable contraception users substantially interfere with testosterone immunoassay measurements and confound interpretation of biological outcomes.

Serum norethisterone (NET) levels in NET-enanthate (NET-EN) injectable contraception users substantially interfere with testosterone immunoassay measurements and confound interpretation of biological outcomes.

Journal: Contraception and reproductive medicine
Published: December 21, 2024

Injectable Contraceptives Differentially Affect Select CD4+ HIV-1 Target Cells in the Genital Tract but Not Systemically: Implications for HIV-1 Acquisition.

Injectable Contraceptives Differentially Affect Select CD4+ HIV-1 Target Cells in the Genital Tract but Not Systemically: Implications for HIV-1 Acquisition.

Journal: American journal of reproductive immunology (New York, N.Y. : 1989)
Published: August 16, 2024

Misreporting contraceptive use and the association of peak study progestin levels with weight and BMI among women randomized to the progestin-only injectable contraceptives DMPA-IM and NET-EN.

Misreporting contraceptive use and the association of peak study progestin levels with weight and BMI among women randomized to the progestin-only injectable contraceptives DMPA-IM and NET-EN.

Journal: PloS one
Published: July 21, 2023

The injectable contraceptives depot medroxyprogesterone acetate and norethisterone enanthate substantially and differentially decrease testosterone and sex hormone binding globulin levels: A secondary study from the WHICH randomized clinical trial.

The injectable contraceptives depot medroxyprogesterone acetate and norethisterone enanthate substantially and differentially decrease testosterone and sex hormone binding globulin levels: A secondary study from the WHICH randomized clinical trial.

Journal: PloS one
Published: July 05, 2023

Effects of injectable contraception with depot medroxyprogesterone acetate or norethisterone enanthate on estradiol levels and menstrual, psychological and behavioral measures relevant to HIV risk: The WHICH randomized trial.

Effects of injectable contraception with depot medroxyprogesterone acetate or norethisterone enanthate on estradiol levels and menstrual, psychological and behavioral measures relevant to HIV risk: The WHICH randomized trial.

Journal: PloS one
Published: May 18, 2023

Glucocorticoids and medroxyprogesterone acetate synergize with inflammatory stimuli to selectively upregulate CCL20 transcription.

Glucocorticoids and medroxyprogesterone acetate synergize with inflammatory stimuli to selectively upregulate CCL20 transcription.

Journal: Molecular and cellular endocrinology
Published: July 20, 2022

Increased HIV-1 infection in PBMCs treated in vitro with menstrual cycle phase hormones or medroxyprogesterone acetate likely occurs via different mechanisms.

Increased HIV-1 infection in PBMCs treated in vitro with menstrual cycle phase hormones or medroxyprogesterone acetate likely occurs via different mechanisms.

Journal: American journal of reproductive immunology (New York, N.Y. : 1989)
Published: April 26, 2022

Progestogens exhibit progestogen-, promoter- and isoform-specific effects via the progesterone receptor.

Progestogens exhibit progestogen-, promoter- and isoform-specific effects via the progesterone receptor.

Journal: Steroids
Published: April 04, 2022

Variability and quantification of serum medroxyprogesterone acetate levels.

Variability and quantification of serum medroxyprogesterone acetate levels.

Journal: Steroids
Published: March 30, 2022

Differential off-target glucocorticoid activity of progestins used in endocrine therapy.

Differential off-target glucocorticoid activity of progestins used in endocrine therapy.

Journal: Steroids
Published: November 29, 2021
Showing 1-12 of 44

Last Updated: 09/26/2026