BACKGROUND: Administration of pilocarpine before irradiation can ameliorate radiation-induced hyposalivation. Indirect evidence suggests that this effect may be mediated through induction of a compensatory response. In this study, this hypothesis is tested directly, by assessing the proliferation of progenitor and secretory cells in irradiated and non-irradiated parotid gland tissue. METHODS: In a rat model, parotid glands were unilaterally irradiated with a single dose of 15 Gy, 60 min after administration of pilocarpine (4.0mg/kg). Rats were sacrificed for proliferating cell nuclear antigen (PCNA) labelling, assessing the number of proliferating progenitor and secretory cells, before, and 10h, 1, 3, 7, 10, 20 and 30 days after irradiation. RESULTS: A small radiation-induced increase in PCNA expressing cells was observed, both in the acinar (secretory cells) and intercalated duct cell (containing the progenitor cells) compartment. This increment was significantly enhanced in pilocarpine pre-treated glands. In fact, in this group of animals increased proliferation was observed both in the irradiated and the shielded gland. CONCLUSIONS: Amelioration of early loss of rat salivary gland function after radiation by pilocarpine pre-treatment is, at least in part, due to compensatory mechanisms through increased proliferation of undamaged cells.
BACKGROUND: Administration of pilocarpine before irradiation can ameliorate radiation-induced hyposalivation. Indirect evidence suggests that this effect may be mediated through induction of a compensatory response. In this study, this hypothesis is tested directly, by assessing the proliferation of progenitor and secretory cells in irradiated and non-irradiated parotid gland tissue. METHODS: In a rat model, parotid glands were unilaterally irradiated with a single dose of 15 Gy, 60 min after administration of pilocarpine (4.0mg/kg). Rats were sacrificed for proliferating cell nuclear antigen (PCNA) labelling, assessing the number of proliferating progenitor and secretory cells, before, and 10h, 1, 3, 7, 10, 20 and 30 days after irradiation. RESULTS: A small radiation-induced increase in PCNA expressing cells was observed, both in the acinar (secretory cells) and intercalated duct cell (containing the progenitor cells) compartment. This increment was significantly enhanced in pilocarpine pre-treated glands. In fact, in this group of animals increased proliferation was observed both in the irradiated and the shielded gland. CONCLUSIONS: Amelioration of early loss of rat salivary gland function after radiation by pilocarpine pre-treatment is, at least in part, due to compensatory mechanisms through increased proliferation of undamaged cells.
Authors: Arjan Vissink; James B Mitchell; Bruce J Baum; Kirsten H Limesand; Siri Beier Jensen; Philip C Fox; Linda S Elting; Johannes A Langendijk; Robert P Coppes; Mary E Reyland Journal: Int J Radiat Oncol Biol Phys Date: 2010-11-15 Impact factor: 7.038
Authors: Primož Strojan; Katherine A Hutcheson; Avraham Eisbruch; Jonathan J Beitler; Johannes A Langendijk; Anne W M Lee; June Corry; William M Mendenhall; Robert Smee; Alessandra Rinaldo; Alfio Ferlito Journal: Cancer Treat Rev Date: 2017-07-18 Impact factor: 12.111
Authors: Marc Benderitter; Fabio Caviggioli; Alain Chapel; Robert P Coppes; Chandan Guha; Marco Klinger; Olivier Malard; Fiona Stewart; Radia Tamarat; Peter van Luijk; Charles L Limoli Journal: Antioxid Redox Signal Date: 2014-02-03 Impact factor: 8.401
Authors: Oliver Grundmann; Jamia L Fillinger; Kerton R Victory; Randy Burd; Kirsten H Limesand Journal: BMC Cancer Date: 2010-08-10 Impact factor: 4.430
Authors: Yu-xiong Su; Geza A Benedek; Peter Sieg; Gui-qing Liao; Andreas Dendorfer; Birgit Meller; Dirk Rades; Matthias Klinger; Samer G Hakim Journal: PLoS One Date: 2013-03-29 Impact factor: 3.240