Determination of Serum Di-(2-ethylhexyl) phthalate and Bisphenol A Level in Children with Idiopathic Central Precocious Puberty
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목 적:플라스틱 가소제로 흔히 사용되는 di-(2-ethylhexyl) phthalate (DEHP) 및 각종 식품 포장용기의 소재인 bisphenol A는 에스트로겐 유사 작용이 있다고 알려져 있으며, 소아에서는 성조숙증 발병과의 연관성이 보고된 바 있으나 충분한 연구가 부족한 실정이다. 본 연구는 특발성 진성 성조숙증 환아를 대상으로 내분비교란물질로 알려진 DEHP 및 bisphenol A의 혈중 농도를 측정하여 연관성 여부를 확인하고자 하였다. 방 법:외래 방문 환자 중 특발성 진성 성조숙증 환아 30명(여아 29명, 남아 1명)과 정상 대조군 30명(여아 29명, 남아 1명)을 대상으로 하였다. 신체 검진 및 골연령을 측정하였으며, 혈중 성호르몬 농도 및 성선자극호르몬방출호르몬 자극검사를 시행하여 성조숙증을 진단하였다. 혈장 DEHP 및 bisphenol A의 농도는 gas chromatography/mass spectrometry (GC/MS) 방법으로 분석하였다. 결 과:성조숙증군과 정상대조군의 평균 연령은 8.6±0.9세 대 7.8±1.1세였으며, 신장 표준편차점수는 1.3±1.0 대 -0.4 ±1.1(P˂0.005),체중 표준편차점수는 1.3±1.3 대 -0.2± 1.3(P˂0.005),체질량지수는 17.6±1.5 kg/m2 대 16.2±1.8 kg/m2 (P˂0.005),골연령은 9.5±1.1세 대 7.9±1.9세(P˂0.005)로 성조숙증군의 신체발육이 앞서 있었다. Bisphenol A 검출농도는 두 군간에 차이가 없었으나(성조숙증군 11.2±10.3 ng/mL 대 정상대조군 16.2±12.5 ng/mL) DEHP의 농도는 성조숙증군에서 의미있게 증가한 결과를 보였다(159.01±92.78 ng/mL 대 103.55±92.98 ng/mL, P˂0.05). 결 론:본 연구에서 특발성 진성 성조숙증 환자에서 증가된 혈중 DEHP의 농도는 성조숙증의 발생 원인 중의 하나로 작용할 가능성을 시사한다. 그러나 채취 과정에서 검체가 오염되는 경우를 배제할 수 없고, 질환 발병과 무관한 인체 노출 범위가 아직까지 확립되지 않았다는 문제가 있다. 향후 내분비교란물질과 성조숙증 발생 사이의 연관성에 대한 보다 광범위한 연구와 내분비교란물질의 동물 및 인체 내 작용 및 기전에 대한 연구가 필요하리라 사료된다.
Abstract
Purpose:Environmental endocrine disruptors may affect the endocrine system or sexual development in children. Several recent studies have focused on indoor and dietary pollutants such as di-(2-ethylhexyl) phthalate (DEHP), which is used as a plastic softener, and bisphenol A, which is used in food-packaging materials. Despite the accumulation of data and the substantial arguments implicatinf these pollutants in endocrinal disorders, no clear evidence has been established yet. Thus, we assessed the serum levels of DEHP and bisphenol A in patients diagnosed with idiopathic central precocious puberty (CPP) to estimate the possible environmental hazards associated with increasing number of cases of precocious puberty. Methods:The study included 30 patients (29 girls and 1 boy) with idiopathic CPP and 30 normal control children who visited the pediatric endocrinology clinic. CPP was diagnosed on the basis of clinical & hormonal tests, including the gonadotropin-releasing hormone-stimulation test. The serum DEHP and bisphenol A levels were analyzed by gas chromatography/mass spectrometry. Results:The mean chronological ages (CA) in the idiopathic CPP and control groups were similar (8.6±0.9 vs. 7.8±1.1 years). However, the overall growth stage in the CPP group was advanced. The CPP group had a significantly higher height SDS (1.3±1.0 vs. -0.4±1.1, P˂0.005) and weight SDS (1.3±1.3 vs. -0.2±1.3, P˂0.005) than the control group. Bone age was significantly more advanced in the CPP group than in the control group (BA-CA:14.6±9.4 months vs. 0.8±15.3 months, P˂0.005). While the serum bisphenol A levels were not significantly different between the groups (11.2±10.3 vs.16.2±12.5 ng/mL), the DEHP levels were significantly higher in the CPP group than in the control group (159.01±92.78 vs. 103.55±92.98 ng/mL, P˂0.05). Conclusion:This study suggests that DEHP, one of most commonly used plasticizers, may be an etiologic factor for precocious puberty.
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