Abstract:
We had earlier identified a 60 kDa nuclear lamin protein (laming unique to the germ cells of rat
testis which was subsequently shown to be antigenically conserved in germ cells of grasshopper, rooster, frog
and plants. Wehave now obtained eight monoclonal antibodies in mouse against this lamin? antigen. While all
the eight Mabs reacted with laming antigen in an immunoblot analysis, only three Mabs (AnCi, A\\D^ C\F-j)
showed strong reactivity in the immunofluorescence analysis of the germ cells. The Mabs A\\Cn and A11D4
showed a slight cross-reactivity with rat liver lamin B. Indirect immunofluorescence analysis of pre-meiotic, meiotic
and post-meiotic germ cells with Mabs have shown that while the lamin? is localized in the lamina structures
of spermatogonia and round spermatids, it is localized to the phase dense regions of pachytene spermatocytes
which is in conformity with our previous observations using rabbit polyclonal antibodies. The localization of
the antigen in the germ cells was also confirmed by immunohistochemical staining of the thin sections of seminiferous
tubules. By immunostaining the surface spread pachytene spermatocytes, the antigen was further localized
to the telomeric ends of the paired homologous chromosomes. Using anti-somatic lamin B antibodies, we
have also demonstrated the absence of somatic lamins in meiotic and post-meiotic germ cells. The lamina structure
of pre-meiotic spermatogonial nucleus contains both somatic lamin B and lamin? as evidenced by immunofluorescence
studies with two differently fluorochrome labelled anti-lamin B and anti-lamin? antibodies. The
selective retention of lamin? in the pachytene spermatocytes is probably earlier identified a 60 kDa nuclear lamin protein (laming unique to the germ cells of rat
testis which was subsequently shown to be antigenically conserved in germ cells of grasshopper, rooster, frog
and plants. Wehave now obtained eight monoclonal antibodies in mouse against this lamin? antigen. While all
the eight Mabs reacted with laming antigen in an immunoblot analysis, only three Mabs (AnCi, A\\D^ C\F-j)
showed strong reactivity in the immunofluorescence analysis of the germ cells. The Mabs A\\Cn and A11D4
showed a slight cross-reactivity with rat liver lamin B. Indirect immunofluorescence analysis of pre-meiotic, meiotic
and post-meiotic germ cells with Mabs have shown that while the lamin? is localized in the lamina structures
of spermatogonia and round spermatids, it is localized to the phase dense regions of pachytene spermatocytes
which is in conformity with our previous observations using rabbit polyclonal antibodies. The localization of
the antigen in the germ cells was also confirmed by immunohistochemical staining of the thin sections of seminiferous
tubules. By immunostaining the surface spread pachytene spermatocytes, the antigen was further localized
to the telomeric ends of the paired homologous chromosomes. Using anti-somatic lamin B antibodies, we
have also demonstrated the absence of somatic lamins in meiotic and post-meiotic germ cells. The lamina structure
of pre-meiotic spermatogonial nucleus contains both somatic lamin B and lamin? as evidenced by immunofluorescence
studies with two differently fluorochrome labelled anti-lamin B and anti-lamin? antibodies. The
selective retention of lamin? in the pachytene spermatocytes is probably earlier identified a 60 kDa nuclear lamin protein (laming unique to the germ cells of rat
testis which was subsequently shown to be antigenically conserved in germ cells of grasshopper, rooster, frog
and plants. Wehave now obtained eight monoclonal antibodies in mouse against this lamin? antigen. While all
the eight Mabs reacted with laming antigen in an immunoblot analysis, only three Mabs (AnCi, A\\D^ C\F-j)
showed strong reactivity in the immunofluorescence analysis of the germ cells. The Mabs A\\Cn and A11D4
showed a slight cross-reactivity with rat liver lamin B. Indirect immunofluorescence analysis of pre-meiotic, meiotic
and post-meiotic germ cells with Mabs have shown that while the lamin? is localized in the lamina structures
of spermatogonia and round spermatids, it is localized to the phase dense regions of pachytene spermatocytes
which is in conformity with our previous observations using rabbit polyclonal antibodies. The localization of
the antigen in the germ cells was also confirmed by immunohistochemical staining of the thin sections of seminiferous
tubules. By immunostaining the surface spread pachytene spermatocytes, the antigen was further localized
to the telomeric ends of the paired homologous chromosomes. Using anti-somatic lamin B antibodies, we
have also demonstrated the absence of somatic lamins in meiotic and post-meiotic germ cells. The lamina structure
of pre-meiotic spermatogonial nucleus contains both somatic lamin B and lamin? as evidenced by immunofluorescence
studies with two differently fluorochrome labelled anti-lamin B and anti-lamin? antibodies. The
selective retention of lamin? in the pachytene spermatocytes is probably B and anti-lamin? antibodies. The
selective retention of lamin? in the pachytene spermatocytes is probably essential for anchoring the telomeric selective retention of lamin? in the pachytene spermatocytes is probably essential for anchoring the telomeric
ends of the paired chromosomesto the inner nuclear membrane.