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Messenger Ribonucleic Acid in Rat Sertoli Cells Is Dependent upon Interaction with Germ Cells1
Department of Woman and Child Health (C.K.J., M.H., O.S.), Astrid Lindgren Childrens Hospital, Pediatric Endocrinology Unit, Karolinska Hospital Q2:08, SE-17176 Stockholm, Sweden; Department of Neuroscience (R.H.Z.), Karolinska Institute, SE-17177 Stockholm, Sweden; and Department of Anatomy (M.P.), University of Turku, FIN-20520 Turku, Finland
Address all correspondence and requests for reprints to: Cecilia Jonsson, M.D., Department of Woman and Child Health, Astrid Lindgren Childrens Hospital, Pediatric Endocrinology Unit, Karolinska Institute & Hospital Q2:08, SE-17176 Stockholm, Sweden. E-mail cecilia.jonsson{at}kbh.ki.se
Interleukin-1 (IL-1), a proinflammatory cytokine originally isolated as
a product of activated mononuclear phagocytes, consists of two distinct
agonist proteins, IL-1
and IL-1ß, of which IL-1ß is the major
inducible IL-1 protein produced by macrophages. We show here that mRNA
of IL-1
, but not IL-1ß, is constitutively expressed by the intact
rat testis and localize the transcript to Sertoli cells as confirmed by
a novel squash technique. The expression is developmentally regulated
and appears only after postnatal day 20 in the rat testis,
corresponding to onset of puberty. IL-1
mRNA shows a stage-dependent
expression pattern during the cycle of the seminiferous epithelium. It
is low or absent in stage VII, but present in all other stages of the
cycle. The same stage-dependent distribution was also observed at the
protein level when bioactive IL-1 was measured in extracts of
accurately defined one millimeter segments of seminiferous tubules. No
IL-1
mRNA was detected in adult rat testes after germ cell depletion
by fetal irradiation or cytostatic drug treatment. Because stage VII is
the only segment of the seminiferous tubules lacking DNA replication,
we propose that IL-1
is involved in this event during mitosis and
meiosis of spermatogenesis and that its expression is dependent upon
interactions between Sertoli cells and germ cells.
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