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Related Research Units

Urology Research

Research Overview

Dr. Oottamasathien is an Associate Professor of Surgery at Harvard Medical School. He is a board-certified pediatric urologist previously specializing in complex hypospadias surgery and now has a central focus on optimizing treatment approaches for children suffering from voiding dysfunction and general pediatric urologic conditions. Dr. Oottamasathien earned his medical degree from the University of Colorado at Denver and Health Sciences Center. He then completed his pediatric urology fellowship at Vanderbilt University in 2007. From 2007 to 2017, he was the Director of Pediatric Urology Basic Science Research at the University of Utah. 

Additionally, he was the Director of Pediatric Urology Basic Science Research at Massachusetts General Hospital from 2017 to 2021. His research centered around models, mechanisms, and innovative therapeutics to treat inflammation and pain conditions involving the bladder. He has received K12, R43 SBIR, and two independent R01 grants from the NIH during his basic science tenure. Currently, his research efforts revolve around curriculum development integrating general pediatrician’s into pediatric urology practices to treat nonsurgical patients with bowel and bladder dysfunction. In addition, he continues to push forward novel device development in the domain of neuromodulation to treat children with voiding dysfunction.

Research Background

Over the past two decades, I’ve dedicated my life towards treating patients suffering from inflammatory diseases and elucidating the pathophysiology and testing therapeutics to treat these conditions. I am a pediatric urologist and have extensive experience in molecular biology, developmental biology, genitourinary embryology, inflammatory cell biology, and therapeutic biomaterial development.

Education

Undergraduate School

University of Colorado at Boulder
1993 Boulder CO

Medical School

University of Colorado School of Medicine
1999 Denver CO

Internship

University of Colorado School of Medicine
2000 Denver CO

Residency

University of Colorado School of Medicine
2005 Denver CO

Fellowship

Vanderbilt Children's Hospital
2007 Nashville TN

Media

Caregiver Profile

Meet Dr. Siam Oottamasathien

Publications

  1. Recurrent idiopathic ischemic priapism in a healthy pediatric patient: A case report. Urol Case Rep. 2025 Nov; 63:103241. View Abstract
  2. Real-Time Bladder Volume Monitoring for Pediatric Patients Using a Commercially Available Wearable Ultrasound Device. Neurourol Urodyn. 2025 Jun; 44(5):1188-1192. View Abstract
  3. Editorial Comment. J Urol. 2023 Aug; 210(2):358. View Abstract
  4. An Oligomeric Sulfated Hyaluronan and Silk-Elastinlike Polymer Combination Protects against Murine Radiation Induced Proctitis. Pharmaceutics. 2022 Jan 12; 14(1). View Abstract
  5. Silk-elastinlike copolymers enhance bioaccumulation of semisynthetic glycosaminoglycan ethers for prevention of radiation induced proctitis. J Control Release. 2021 04 10; 332:503-515. View Abstract
  6. Temperature-responsive silk-elastinlike protein polymer enhancement of intravesical drug delivery of a therapeutic glycosaminoglycan for treatment of interstitial cystitis/painful bladder syndrome. Biomaterials. 2019 10; 217:119293. View Abstract
  7. Sulfated glycosaminoglycans and low-density lipoprotein receptor contribute to Clostridium difficile toxin A entry into cells. Nat Microbiol. 2019 10; 4(10):1760-1769. View Abstract
  8. Unilateral open extravesical ureteral reimplanation with contralateral dextronomer/hyaluronic acid injection performed as an outpatient therapy. J Pediatr Urol. 2018 12; 14(6):566.e1-566.e5. View Abstract
  9. IL-33 mast cell axis is central in LL-37 induced bladder inflammation and pain in a murine interstitial cystitis model. Cytokine. 2018 10; 110:420-427. View Abstract
  10. Amniotic therapeutic biomaterials in urology: current and future applications. Transl Androl Urol. 2017 Oct; 6(5):943-950. View Abstract
  11. Bladder pain in an LL-37 interstitial cystitis and painful bladder syndrome model. Am J Clin Exp Urol. 2017; 5(2):10-17. View Abstract
  12. Combination of Extracorporeal Shockwave Lithotripsy and Ureteroscopy for Large Staghorn Calculi in a Pediatric Patient: Case Report. J Endourol Case Rep. 2017; 3(1):64-66. View Abstract
  13. Silk-elastinlike protein polymers enhance the efficacy of a therapeutic glycosaminoglycan for prophylactic treatment of radiation-induced proctitis. J Control Release. 2017 Oct 10; 263:46-56. View Abstract
  14. Childhood Cancer Risk in the Siblings and Cousins of Men with Poor Semen Quality. J Urol. 2017 03; 197(3 Pt 2):898-905. View Abstract
  15. Prevention of sinonasal inflammation by a synthetic glycosaminoglycan. Int Forum Allergy Rhinol. 2017 02; 7(2):177-184. View Abstract
  16. Topical cathelicidin (LL-37) an innate immune peptide induces acute olfactory epithelium inflammation in a mouse model. Int Forum Allergy Rhinol. 2015 Dec; 5(12):1141-50. View Abstract
  17. Urologic problems in spina bifida patients transitioning to adult care. Urology. 2014 Aug; 84(2):440-4. View Abstract
  18. Prevention of anti-microbial peptide LL-37-induced apoptosis and ATP release in the urinary bladder by a modified glycosaminoglycan. PLoS One. 2013; 8(10):e77854. View Abstract
  19. LL-37 induced cystitis and the receptor for advanced glycation end-products (RAGE) pathway. Adv Biosci Biotechnol. 2013 Aug 01; 4(8B):1-8. View Abstract
  20. Padded self-adhesive strap immobilization following newborn bladder exstrophy closure: the Utah straps. J Urol. 2013 Dec; 190(6):2216-20. View Abstract
  21. Physiological relevance of LL-37 induced bladder inflammation and mast cells. J Urol. 2013 Oct; 190(4 Suppl):1596-1602. View Abstract
  22. Pediatric urinary stone composition in the United States. J Urol. 2012 Jun; 187(6):2182-7. View Abstract
  23. A murine model of inflammatory bladder disease: cathelicidin peptide induced bladder inflammation and treatment with sulfated polysaccharides. J Urol. 2011 Oct; 186(4 Suppl):1684-92. View Abstract
  24. Metastatic Crohn's disease of the penis in a pediatric patient. Inflamm Bowel Dis. 2011 Apr; 17(4):1056. View Abstract
  25. Parameatal urethral cysts in prepubertal males. J Urol. 2011 Mar; 185(3):1042-5. View Abstract
  26. Dynamically crosslinked gold nanoparticle - hyaluronan hydrogels. Adv Mater. 2010 Nov 09; 22(42):4736-40. View Abstract
  27. Photocrosslinkable hyaluronan-gelatin hydrogels for two-step bioprinting. Tissue Eng Part A. 2010 Aug; 16(8):2675-85. View Abstract
  28. 250 consecutive unilateral extravesical ureteral reimplantations in an outpatient setting. J Urol. 2010 Jul; 184(1):311-4. View Abstract
  29. Temporal-spatial protein expression in bladder tissue derived from embryonic stem cells. J Urol. 2008 Oct; 180(4 Suppl):1784-9. View Abstract
  30. Prostate epithelial cell fate. Differentiation. 2008 Jul; 76(6):682-98. View Abstract
  31. Urothelial inhibition of transforming growth factor-beta in a bladder tissue recombination model. J Urol. 2007 Oct; 178(4 Pt 2):1643-9. View Abstract
  32. Testicular tumours in children: a single-institutional experience. BJU Int. 2007 May; 99(5):1123-6. View Abstract
  33. Directed differentiation of embryonic stem cells into bladder tissue. Dev Biol. 2007 Apr 15; 304(2):556-66. View Abstract
  34. Primary extrarenal nephroblastomatosis. Urology. 2007 Jan; 69(1):184.e3-4. View Abstract
  35. Bladder tissue formation from cultured bladder urothelium. Dev Dyn. 2006 Oct; 235(10):2795-801. View Abstract
  36. Gonadoblastoma and Turner syndrome. J Urol. 2006 May; 175(5):1858-60. View Abstract
  37. Laparoscopic Palomo varicocele ligation in children and adolescents: results of 103 cases. J Urol. 2004 Oct; 172(4 Pt 2):1749-52; discussion 1752. View Abstract
  38. Recent advances in hormonal therapy for advanced prostate cancer. Oncology (Williston Park). 2003 Aug; 17(8):1047-52; discussion 1054-8. View Abstract
  39. Should routine screening for prostate-specific antigen be recommended? Arch Intern Med. 2003 Mar 24; 163(6):661-2; discussion 666. View Abstract

Contact Siam Oottamasathien

Phone: 617-355-7796
Fax: 617-730-0474
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