Treatment for chemotherapy-induced alopecia in mice using parathyroid hormone agonists and antagonists linked to a collagen binding domain

Ranjitha Katikaneni, Tulasi Ponnapakkam, Hirofumi Suda, Shigeru Miyata, Joshua Sakon, Osamu Matsushita, Robert C. Gensure

Research output: Contribution to journalArticle

20 Scopus citations

Abstract

Parathyroid hormone (PTH) agonists and antagonists have been shown to improve hair growth after chemotherapy; however, rapid clearance and systemic side-effects complicate their usage. To facilitate delivery and retention to skin, we fused PTH agonists and antagonists to the collagen binding domain (CBD) of Clostridium histolyticum collagenase. in-vitro studies showed that the agonist fusion protein, PTH-CBD, bound collagen and activated the PTH/parathyroid hormone-related peptide receptor in SaOS-2 cells. The antagonist fusion proteins, PTH(7-33)-CBD and PTH([-1]-33)-CBD, also bound collagen and antagonized PTH(1-34) effect in SaOS-2 cells; however, PTH(7-33)-CBD had lower intrinsic activity. Distribution studies confirmed uptake of PTH-CBD to the skin at 1 and 12 hr after subcutaneous injection. We assessed in vivo efficacy of PTH-CBD and PTH(7-33)-CBD in C57BL/6J mice. Animals were depilated to synchronize the hair follicles; treated on Day 7 with agonist, antagonist, or vehicle; treated on Day 9 with cyclophosphamide (150 mg/kg i.p.) or vehicle; and sacrificed on Day 39. Normal mice (no chemo and no treatment) showed rapid regrowth of hair and normal histology. Chemo + Vehicle mice showed reduced hair regrowth and decreased pigmentation; histology revealed reduced number and dystrophic anagen/ catagen follicles. Chemo + Antagonist mice were grossly and histologically indistinguishable from Chemo + Vehicle mice. Chemo + Agonist mice showed more rapid regrowth and repigmentation of hair; histologically, there was a normal number of hair follicles, most of which were in the anagen phase. Overall, the agonist PTH-CBD had prominent effects in reducing chemotherapy-induced damage of hair follicles and may show promise as a therapy for chemotherapy-induced alopecia.

Original languageEnglish (US)
Pages (from-to)E813-E821
JournalInternational Journal of Cancer
Volume131
Issue number5
DOIs
StatePublished - Sep 1 2012

Keywords

  • Bone mineral density
  • Chemotherapy-induced alopecia
  • Cyclophosphamide
  • PTH-CBD agonist
  • PTH-CBD antagonist
  • Parathyroid hormone

ASJC Scopus subject areas

  • Oncology
  • Cancer Research

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