Sensitivity of spermatogonia to irradiation varies with age in pre-pubertal ram lambs

Title
Sensitivity of spermatogonia to irradiation varies with age in pre-pubertal ram lambs
Publication Date
2018
Author(s)
Olejnik, J
Suchowerska, N
Herrid, M
Jackson, A
Jackson, M
Andronicos, Nicholas
( author )
OrcID: https://orcid.org/0000-0001-5881-2296
Email: nandroni@une.edu.au
UNE Id une-id:nandroni
Hinch, Geoffrey
( author )
OrcID: https://orcid.org/0000-0003-4731-865X
Email: ghinch@une.edu.au
UNE Id une-id:ghinch
Hill, J R
Type of document
Journal Article
Language
en
Entity Type
Publication
Publisher
Elsevier BV
Place of publication
Netherlands
DOI
10.1016/j.anireprosci.2018.03.037
UNE publication id
une:23417
Abstract
Although germ cells from donor rams transplanted into irradiated recipient testes have produced donor derived offspring, efficiency is low. Further optimization of recipient irradiation protocols will add precision to the depletion of recipient spermatogonia prior to germ cell transplant. Three irradiation doses (9,12,15 Gy) were administered to ram lambs aged 14 weeks (Group 1) and 20 weeks (Group 2), then testicular biopsies were collected 1, 2 and 3 months after irradiation. At 1 month after irradiation of Group 1, only the largest dose (15 Gy) reduced spermatogonia numbers below 10% of non-irradiated controls, whereas in Group 2 lambs, each irradiation dose reduced spermatogonia below 10% of controls. In both Groups, fewer differentiated germ cells were present in seminiferous tubules compared to controls. At 2 months after irradiation, spermatogonia numbers in both Groups increased more than sixfold to be similar to controls, whereas fewer differentiated germ cells were present in the tubules of both Groups. At 3 months in Group 1, each irradiation dose reduced spermatogonia numbers to<30% of controls and fewer tubules contained differentiated germ cells. Lesser expression of spermatogonial genes, VASA and UCHL- 1, was observed in the 15 Gy group. In Group 2, only 12 Gy treated tubules contained fewer spermatogonia. Knowledge of these subtle differences between age groups in the effect of irradiation doses on spermatogonia or differentiated germ cell numbers and the duration of recovery of spermatogonia numbers after irradiation will aid the timing of germ cell transplants into prepubertal recipient lambs.
Link
Citation
Animal Reproduction Science, v.193, p. 58-67
ISSN
1873-2232
0378-4320
Start page
58
End page
67

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