contrasexual precocity
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出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2020/04/12 17:50:13」(JST)
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| Precocious puberty | |
|---|---|
| Other names | Early puberty |
| Specialty | Gynecology, endocrinology |
In medicine, precocious puberty is puberty occurring at an unusually early age. In most cases, the process is normal in every aspect except the unusually early age and simply represents a variation of normal development. In a minority of children with precocious puberty, the early development is triggered by a disease such as a tumor or injury of the brain.[1] Even when there is no disease, unusually early puberty can have adverse effects on social behavior and psychological development, can reduce adult height potential, and may shift some lifelong health risks. Central precocious puberty can be treated by suppressing the pituitary hormones that induce sex steroid production. The opposite condition is delayed puberty.
The term is used with several slightly different meanings that are usually apparent from the context. In its broadest sense, and often simplified as early puberty, "precocious puberty" sometimes refers to any physical sex hormone effect, due to any cause, occurring earlier than the usual age, especially when it is being considered as a medical problem. Stricter definitions of "precocity" may refer only to central puberty starting before a statistically specified age based on percentile in the population (e.g., 2.5 standard deviations below the population mean),[2] on expert recommendations of ages at which there is more than a negligible chance of discovering an abnormal cause, or based on opinion as to the age at which early puberty may have adverse effects. A common definition for medical purposes is onset before 8 years in girls or 9 years in boys.[3]
Contents
- 1 Causes
- 1.1 Central
- 1.2 Peripheral
- 1.3 Isosexual and heterosexual
- 1.4 Effects of precocious puberty
- 1.5 Research
- 2 Diagnosis
- 3 Treatment
- 4 Prognosis
- 5 See also
- 6 References
- 7 External links
Causes
Pubertas praecox is the Latin term used by physicians in the 19th century. Early pubic hair, breast, or genital development may result from natural early maturation or from several other conditions.
Central
If the cause can be traced to the hypothalamus or pituitary, the cause is considered central. Other names for this type are complete or true precocious puberty.[4]
Causes of central precocious puberty can include:
- damage to the inhibitory system of the brain (due to infection, trauma, or irradiation)
- hypothalamic hamartoma produces pulsatile gonadotropin-releasing hormone (GnRH)
- Langerhans cell histiocytosis
- McCune–Albright syndrome
Central precocious puberty can also be caused by brain tumors, infection (most commonly tuberculous meningitis, especially in developing countries), trauma, hydrocephalus, and Angelman syndrome.[5] Precocious puberty is associated with advancement in bone age, which leads to early fusion of epiphyses, thus resulting in reduced final height and short stature.[6]
Adrenocortical oncocytomas are rare with mostly benign and nonfunctioning tumors. There have been only three cases of functioning adrenocortical oncocytoma that have been reported up until 2013. Children with adrenocortical oncocytomas will present with "premature pubarche, clitoromegaly, and increased serum dehydroepiandrosterone sulfate and testosterone" which are some of the presentations associated with precocious puberty.[7][8]
Precocious puberty in girls begins before the age of 8. The youngest mother on record is Lina Medina, who gave birth at the age of either 5 years, 7 months and 17 days[9] or 6 years 5 months as mentioned in another report.[10]
"Central precocious puberty (CPP) was reported in some patients with suprasellar arachnoid cysts (SAC), and SCFE (slipped capital femoral epiphysis) occurs in patients with CPP because of rapid growth and changes of growth hormone secretion."[11]
If no cause can be identified, it is considered idiopathic or constitutional.
Peripheral
Secondary sexual development induced by sex steroids from other abnormal sources is referred to as peripheral precocious puberty or precocious pseudopuberty. It typically presents as a severe form of disease with children. Symptoms are usually as a sequelae from adrenal insufficiency (because of 21-hydroxylase deficiency or 11-beta hydroxylase deficiency, the former being more common), which includes but is not limited to hypertension, hypotension, electrolyte abnormalities, ambiguous genitalia in females, signs of virilization in females. Blood tests will typically reveal high level of androgens with low levels of cortisol.
Causes can include:
- Endogenous sources
- Gonadal tumors (such as arrhenoblastoma)
- Adrenal tumors
- Germ cell tumor[12][13]
- Congenital adrenal hyperplasia
- McCune–Albright syndrome
- Familial male-limited precocious puberty (testotoxicosis)
- Exogenous hormones
- Environmental exogenous hormones
- As treatment for another condition
Isosexual and heterosexual
Generally, patients with precocious puberty develop phenotypically appropriate secondary sexual characteristics. This is called isosexual precocity.[14]
In some cases, a patient may develop characteristics of the opposite sex. For example, a male may develop breasts and other feminine characteristics, while a female may develop a deepened voice and facial hair. This is called heterosexual or contrasexual precocity. It is very rare in comparison to isosexual precocity and is usually the result of unusual circumstances.
As an example, children with a very rare genetic condition called aromatase excess syndrome in which exceptionally high circulating levels of estrogen are present usually develop precocious puberty. Males and females are hyper-feminized by the syndrome.[14] The "opposite" case would be the hyper-masculinisation of both male and female patients with congenital adrenal hyperplasia (CAH) due to 21-hydroxylase deficiency, in which there is an excess of androgens. Thus, in the aromatase excess syndrome the precocious puberty is isosexual in females and heterosexual in males, whilst in the CAH it's isosexual in males and heterosexual in females.
Effects of precocious puberty
Research
Although the causes of early puberty are still somewhat unclear, girls who have a high-fat diet and are not physically active or are obese are more likely to physically mature earlier.[15][16][17] "Obese girls, defined as at least 10 kilograms (22 pounds) overweight, had an 80 percent chance of developing breasts before their ninth birthday and starting menstruation before age 12 – the western average for menstruation is about 12.7 years."[17] In addition to diet and exercise habits, exposure to chemicals that mimic estrogen (known as xenoestrogens) is another possible cause of early puberty in girls. Bisphenol A, a xenoestrogen found in hard plastics, has been shown to affect sexual development.[18] "Factors other than obesity, however, perhaps genetic and/or environmental ones, are needed to explain the higher prevalence of early puberty in black versus white girls."[16] While more girls are increasingly entering puberty at younger ages, new research indicates that some boys are actually starting later (delayed puberty).[19][20] "Increasing rates of obese and overweight children in the United States may be contributing to a later onset of puberty in boys, say researchers at the University of Michigan Health System."[20]
High levels of beta-hCG in serum and cerebrospinal fluid observed in a 9-year-old boy suggest a pineal gland tumor. The tumor is called a chorionic gonadotropin secreting pineal tumor. Radiotherapy and chemotherapy reduced tumor and beta-hCG levels normalized.[21]
In a study using neonatal melatonin on rats, results suggest that elevated melatonin could be responsible for some cases of early puberty.[22]
Familial cases of idiopathic central precocious puberty (ICPP) have been reported, leading researchers to believe there are specific genetic modulators of ICPP. Mutations in genes such as LIN28,[23][24] and LEP and LEPR, which encode leptin and the leptin receptor,[25] have been associated with precocious puberty. The association between LIN28 and puberty timing was validated experimentally in vivo, when it was found that mice with ectopic over-expression of LIN28 show an extended period of pre-pubertal growth and a significant delay in puberty onset.[26]
Mutations in the kisspeptin (KISS1) and its receptor, KISS1R (also known as GPR54), involved in GnRH secretion and puberty onset, are also thought to be the cause for ICPP[27][28] However, this is still a controversial area of research, and some investigators found no association of mutations in the LIN28 and KISS1/KISS1R genes to be the common cause underlying ICPP.[29]
The gene MKRN3, which is a maternally imprinted gene, was first cloned by Jong et al. in 1999. MKRN3 was originally named Zinc finger protein 127. It is located on human chromosome 15 on the long arm in the Prader-Willi syndrome critical region2, and has since been identified as a cause of premature sexual development or CPP.[30] The identification of mutations in MKRN3 leading to sporadic cases of CPP has been a significant contribution to better understanding the mechanism of puberty.[31] MKRN3 appears to act as a "brake" on the central hypothalamic-pituitary access. Thus, loss of function mutations of the protein allow early activation of the GnRH pathway and cause phenotypic CPP. Patients with a MKRN3 mutation all display the classic signs of CCP including early breast and testes development, increased bone aging and elevated hormone levels of GnRH and LH.[32]
Diagnosis
Studies indicate that breast development in girls and the appearance of pubic hair in both girls and boys are starting earlier than in previous generations.[16][33][34] As a result, "early puberty" in children as young as 9 and 10 is no longer considered abnormal, particularly with girls. Although it is not considered as abnormal, it may be upsetting to parents[19][35] and can be harmful to children who mature physically at a time when they are immature mentally.[36]
No age reliably separates normal from abnormal processes in children, but the following age thresholds for evaluation are thought to minimize the risk of missing a significant medical problem:
- Breast development in boys before appearance of pubic hair or testicular enlargement
- Pubic hair or genital enlargement (gonadarche) in boys with onset before 9.5 years
- Pubic hair (pubarche) before 8 or breast development (thelarche) in girls with onset before 7 years
- Menstruation (menarche) in girls before 10 years
Medical evaluation is sometimes necessary to recognize the few children with serious conditions from the majority who have entered puberty early but are still medically normal. Early sexual development warrants evaluation because it may:
- induce early bone maturation and reduce eventual adult height
- indicate the presence of a tumour or other serious problem
- cause the child, particularly a girl, to become an object of adult sexual interest.[17][37][38]
Treatment
One possible treatment is with anastrozole. Histrelin, triptorelin, or leuprorelin, any GnRH agonists, may be used. Non-continuous usage of GnRH agonists stimulates the pituitary gland to release follicle stimulating hormone (FSH) and luteinizing hormone (LH).[39] However, when used regularly, GnRH agonists cause a decreased release of FSH and LH. Prolonged use has a risk of causing osteoporosis. After stopping GnRH agonists, pubertal changes resume within 3 to 12 months.
Prognosis
Early puberty is posited to put girls at higher risk of sexual abuse,[17][38] however, a causal relationship is, as yet, inconclusive.[38] Early puberty also puts girls at a higher risk for teasing or bullying, mental health disorders and short stature as adults.[17][37][40] Helping children control their weight is suggested to help delay puberty. Early puberty additionally puts girls at a "far greater" risk for breast cancer later in life[citation needed]. Girls as young as 8 are increasingly starting to menstruate, develop breasts and grow pubic and underarm hair; these "biological milestones" typically occurred only at 13 or older in the past. African-American girls are especially prone to early puberty.[16] There are theories debating the trend of early puberty, but the exact causes are not known.
Though boys face fewer problems upon early puberty than girls, early puberty is not always positive for boys; early sexual maturation in boys can be accompanied by increased aggressiveness due to the surge of hormones that affect them.[41] Because they appear older than their peers, pubescent boys may face increased social pressure to conform to adult norms; society may view them as more emotionally advanced, although their cognitive and social development[disambiguation needed] may lag behind their appearance.[41] Studies have shown that early maturing boys are more likely to be sexually active and are more likely to participate in risky behaviors.[42]
See also
- Delayed puberty
- List of youngest birth mothers
- List of youngest birth fathers
- Premature menopause and premature ovarian failure
References
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- ^ precocious+puberty at the US National Library of Medicine Medical Subject Headings (MeSH)
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- ^ David Gardner, Dolores Shoback. Basic And Clinical Endocrinology. McGraw-Hill Medical; 2011. 9th Edition. Pg. 550
- ^ Dickerman, R. D.; Stevens, Q. E.; Steide, J. A.; Schneider, S. J. (2004). "Precocious puberty associated with a pineal cyst: is it disinhibition of the hypothalamic-pituitary axis?". Neuro Endocrinology Letters. 25 (3): 173–175. PMID 15349080.
- ^ Kumar, Manoj; Mukhopadhyay, Satinath; Dutta, Deep (2015-01-15). "Challenges and controversies in diagnosis and management of gonadotropin dependent precocious puberty: An Indian perspective". Indian Journal of Endocrinology and Metabolism. 19 (2): 228–235. doi:10.4103/2230-8210.149316. PMC 4319262. PMID 25729684.
- ^ Subbiah, Sridhar; Nahar, Uma; Samujh, Ram; Bhansali, Anil (May 2013). "Heterosexual precocity: rare manifestation of virilizing adrenocortical oncocytoma". Annals of Saudi Medicine. 33 (3): 294–297. doi:10.5144/0256-4947.2013.294. ISSN 0256-4947. PMC 6078526. PMID 23793435.
So far, in the pediatric age group, only three cases of functioning adrenocortical oncocytoma have been reported. We report a case of functioning adrenocortical oncocytoma in a 3 1/2-year-old female child who presented with premature pubarche, clitoromegaly, and increased serum dehydroepiandrosterone sulfate and testosterone. She was managed successfully with right adrenalectomy, and the tumor histology was consistent with adrenal oncocytoma.
- ^ Santos-Silva, Rita; Bonito-Vítor, Artur; Campos, Miguel; Fontoura, Manuel (2014). "Gonadotropin-Dependent Precocious Puberty in an 8-Year-Old Boy with Leydig Cell Testicular Tumor". Hormone Research in Paediatrics. 82 (2): 133–137. doi:10.1159/000358084. ISSN 1663-2818. PMID 24862970.
- ^ "Six decades later, world's youngest mother awaits aid". The Telegraph. August 27, 2002. Archived from the original on July 22, 2009. Retrieved April 13, 2016.
- ^ "Little Mother". Time. December 16, 1957. Archived from the original on April 22, 2009. Retrieved January 9, 2008.
- ^ Yamato, Fumiko; Takaya, Junji; Higashino, Hirohiko; Yamanouchi, Yasuo; Suehara, Hiroshi; Kobayashi, Yohnosuke (March 2005). "Slipped capital femoral epiphysis during the treatment of precocious puberty with a gonadotropin-releasing hormone-agonist: aetiological considerations". European Journal of Pediatrics. 164 (3): 173–174. doi:10.1007/s00431-004-1578-7. PMID 15592875.
- ^ Masse, R. J.; Shaw, P. J.; Burgess, M. (2008). "Intracranial choriocarcinoma causing precocious puberty and cured with combined modality therapy". Journal of Paediatrics and Child Health. 29 (6): 464–467. doi:10.1111/j.1440-1754.1993.tb03022.x. PMID 8286166.
- ^ Antoniazzi, F.; Zamboni, G. (2004). "Central precocious puberty: current treatment options". Paediatric Drugs. 6 (4): 211–231. doi:10.2165/00148581-200406040-00002. PMID 15339200.
- ^ a b Jarzabek-Bielecka, G; Warchoł-Biedermann, K; Sowińska, E; Wachowiak-Ochmańska, K (April 2011). "[Precocious puberty]". Ginekologia Polska. 82 (4): 281–6. PMID 21735696.
- ^ (Tanner, 1990).
- ^ a b c d Kaplowitz, P. B.; Slora, E. J.; Wasserman, R. C.; Pedlow, S. E.; Herman-Giddens, M. E. (2001). "Earlier onset of puberty in girls: relation to increased body mass index and race". Pediatrics. 108 (2): 347–353. doi:10.1542/peds.108.2.347. PMID 11483799.
- ^ a b c d e McKenna, Phil (2007-03-05). "Childhood obesity brings early puberty for girls". New Scientist. Archived from the original on 2008-04-19. Retrieved 2010-05-22.
- ^ Libertun, C.; Lux-Lantos, V.; Bianchi, M.; Fernández, M. (2009). "Neonatal Exposure to Bisphenol a Alters Reproductive Parameters and Gonadotropin Releasing Hormone Signaling in Female Rats". Environmental Health Perspectives. 117 (5): 757–762. doi:10.1289/ehp.0800267. PMC 2685838. PMID 19479018.
- ^ a b Cooney, Elizabeth (2010-02-11). "Puberty gap: Obesity splits boys, girls. Adolescent males at top of the BMI chart may be delayed". NBC News. Retrieved 2010-05-22.
- ^ a b "Childhood Obesity May Contribute to Later Onset of Puberty for Boys". Science Daily. February 2010. Retrieved 2010-05-22.
- ^ Kuo, H. C.; Sheen, J. M.; Wu, K. S.; Wei, H. H.; Hsiao, C. C. (2006). "Precocious puberty due to human chorionic gonadotropin-secreting pineal tumor". Chang Gung Medical Journal. 29 (2): 198–202. PMID 16767969.
- ^ Esouifino, A. I.; Villanúa, M. A.; Agrasal, C. (1987). "Effect of neonatal melatonin administration on sexual development in the rat". Journal of Steroid Biochemistry. 27 (4–6): 1089–1093. doi:10.1016/0022-4731(87)90194-4. PMID 3121932.
- ^ Park, Sung Won; Lee, Seung-Tae; Sohn, Young Bae; Cho, Sung Yoon; Kim, Se-Hwa; Kim, Su Jin; Kim, Chi Hwa; Ko, Ah-Ra; Paik, Kyung-Hoon; Kim, Jong-Won; Jin, Dong-Kyu (1 January 2012). "polymorphisms are associated with central precocious puberty and early puberty in girls". Korean Journal of Pediatrics. 55 (10): 388–92. doi:10.3345/kjp.2012.55.10.388. PMC 3488615. PMID 23133486.
- ^ Ong, Ken K; Elks, Cathy E; Li, Shengxu; Zhao, Jing Hua; Luan, Jian'an; Andersen, Lars B; Bingham, Sheila A; Brage, Soren; Smith, George Davey; Ekelund, Ulf; Gillson, Christopher J; Glaser, Beate; Golding, Jean; Hardy, Rebecca; Khaw, Kay-Tee; Kuh, Diana; Luben, Robert; Marcus, Michele; McGeehin, Michael A; Ness, Andrew R; Northstone, Kate; Ring, Susan M; Rubin, Carol; Sims, Matthew A; Song, Kijoung; Strachan, David P; Vollenweider, Peter; Waeber, Gerard; Waterworth, Dawn M; Wong, Andrew; Deloukas, Panagiotis; Barroso, Inês; Mooser, Vincent; Loos, Ruth J; Wareham, Nicholas J (16 May 2009). "Genetic variation in LIN28B is associated with the timing of puberty". Nature Genetics. 41 (6): 729–733. doi:10.1038/ng.382. PMC 3000552. PMID 19448623.
- ^ Su, Pen-Hua; Yang, Shun-Fa; Yu, Ju-Shan; Chen, Suh-Jen; Chen, Jia-Yuh (15 February 2012). "Study of leptin levels and gene polymorphisms in patients with central precocious puberty". Pediatric Research. 71 (4–1): 361–367. doi:10.1038/pr.2011.69. PMID 22391636.
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- ^ Teles, Milena Gurgel; Silveira, Leticia Ferreira Gontijo; Tusset, Cintia; Latronico, Ana Claudia (1 October 2011). "New genetic factors implicated in human GnRH-dependent precocious puberty: The role of kisspeptin system". Molecular and Cellular Endocrinology. 346 (1–2): 84–90. doi:10.1016/j.mce.2011.05.019. PMID 21664234.
- ^ Silveira, LG; Noel, SD; Silveira-Neto, AP; Abreu, AP; Brito, VN; Santos, MG; Bianco, SD; Kuohung, W; Xu, S; Gryngarten, M; Escobar, ME; Arnhold, IJ; Mendonca, BB; Kaiser, UB; Latronico, AC (May 2010). "Mutations of the KISS1 gene in disorders of puberty". The Journal of Clinical Endocrinology and Metabolism. 95 (5): 2276–80. doi:10.1210/jc.2009-2421. PMC 2869552. PMID 20237166.
- ^ Tommiska, Johanna; Sørensen, Kaspar; Aksglaede, Lise; Koivu, Rosanna; Puhakka, Lea; Juul, Anders; Raivio, Taneli (1 January 2011). "LIN28B, LIN28A, KISS1, and KISS1R in idiopathic central precocious puberty". BMC Research Notes. 4 (1): 363. doi:10.1186/1756-0500-4-363. PMC 3184284. PMID 21939553.
- ^ Abreu AP, Dauber A, Macedo DB, Noel SD, Brito VN, Gill JC, Cukier P, Thompson IR, Navarro VM, Gagliardi PC, et al. (2013). "Central precocious puberty caused by mutations in the imprinted gene MKRN3". N Engl J Med. 368 (26): 2467–2475. doi:10.1056/nejmoa1302160. PMC 3808195. PMID 23738509.
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External links
| Classification | D
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| External resources |
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- Your Child - Puberty by University of Michigan
- PSM by Child Growth Foundation
- Central Precocious Puberty
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UpToDate Contents
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- 1. 思春期早発症の定義、原因、および評価definition etiology and evaluation of precocious puberty [show details]…pure Leydig cell tumors, and gonadoblastoma may make androgens and cause contrasexual precocity . Leydig cell tumors should be considered in any boy with asymmetric testicular enlargement. Even if …
- 2. 思春期早発症の治療treatment of precocious puberty [show details]… secondary sexual characteristics. Peripheral precocity is most commonly either isosexual (concordant with the child gender), or contrasexual (with virilization of girls and feminization of boys), but can also present …
- 3. まれな先天性副腎過形成uncommon congenital adrenal hyperplasias [show details]… Untreated children progress into isosexual or contrasexual precocious pseudopuberty.… genital ambiguity or signs of hyperandrogenism . The remainder presented in childhood with sexual precocity, early puberty in boys and acne in men, and hirsutism and menstrual irregularities in adolescent…
- 4. 低身長の原因causes of short stature [show details]…steroids (estradiol in girls and testosterone in boys), which have two consequences. One is sexual precocity. The other is accelerated epiphyseal development, which causes rapid childhood growth but more rapid …
- 5. 21-水酸化酵素欠損症による古典的先天性副腎皮質過形成の遺伝学および臨床症状genetics and clinical presentation of classic congenital adrenal hyperplasia due to 21 hydroxylase deficiency [show details]…21OHD may present as hirsutism and menstrual irregularity in young women, early pubarche or sexual precocity in school-age children, or there may be no symptoms. Female infants with classic 21OHD are …
English Journal
- Testosterone exposure in childhood: discerning pathology from physiology.
- Cabrera SM, Rogol AD.
- Expert opinion on drug safety. 2013 May;12(3)375-88.
- Testosterone (T) drives normal male sexual development both in utero and at puberty. Aberrant T exposure manifests as virilization of a female fetus, contrasexual precocity in girls, and isosexual precocity in boys. Evidence of pathologic T exposure warrants a prompt evaluation. The authors introduc
- PMID 23517636
- Disorders of puberty.
- Blondell RD, Foster MB, Dave KC.
- American family physician. 1999 Jul;60(1)209-18, 223-4.
- Normal puberty begins between eight and 14 years of age in girls and between nine and 14 years of age in boys. Pubic hair distribution is used to stage puberty, along with breast size and contour in girls and testicular volume in boys. Some children experience constitutional sexual precocity, but pr
- PMID 10414639
Related Links
- The differential diagnosis of contrasexual precocity in a female child includes late onset congenital adrenal hyperplasia (21-hydroxylase and 11 beta-hydroxylase deficiency), androgen-secreting adrenal mass including adrenal 5
- In medicine, precocious puberty is puberty occurring at an unusually early age. In most cases, the process is normal in every aspect except the unusually early age, and simply represents a variation of normal development. In a minority of children, the early development is triggered by a disease such as a tumor or injury of the brain. Even when there is no disease, unusually early puberty can ...
- INTRODUCTION: Testosterone (T) drives normal male sexual development both in utero and at puberty. Aberrant T exposure manifests as virilization of a female fetus, contrasexual precocity in girls, and isosexual precocity in boys
★リンクテーブル★
| リンク元 | 「異性化性早熟症」 |
| 関連記事 | 「precocity」 |
「異性化性早熟症」
「precocity」
- n.