Abstract
The putative role of the nuclear nucleoside triphosphatase (NTPase) is to provide energy to the nuclear pore complex for poly A(+) mRNA export. Previous work has demonstrated that liver nuclear NTPase activity is greater in 6 month old corpulent (cp/cp) female JCR:LA rats, a hyperlipidemic rat model, compared to lean (+/?) animals. This increase appeared to be related to increases in nuclear membrane cholesterol content. The current study extended these initial data to compare NTPase activity as a function of age and sex in isolated JCR:LA-cp rat liver nuclei, to further test the hypothesis that nuclear membrane cholesterol may modulate NTPase activity. NTPase activity was increased in cp/cp female animals compared to +/? females at all ages studied, with V(max) values increased by 60-176%. Membrane integrity of cp/cp female nuclei was reduced compared to +/? female nuclei. Nuclear membrane cholesterol levels increased linearly with age by 50, 150 and 250% in 3, 6 and 9 month old cp/cp females over leans. In contrast, nuclei from cp/cp males exhibited only minor, isolated changes in NTPase activity. Furthermore, there were no significant changes in nuclear cholesterol content or membrane integrity in the less hyperlipidemic male animals at any age. These data suggest that altered lipid metabolism may lead to changes in nuclear membrane structure, which in turn may alter NTPase activity and functioning of the nuclear pore complex.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 327-335 |
| Number of pages | 9 |
| Journal | Molecular and Cellular Biochemistry |
| Volume | 176 |
| Issue number | 1-2 |
| DOIs | |
| State | Published - 1997 |
| Externally published | Yes |
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Keywords
- Hypercholesterolemia
- Nuclear membrane
- Nuclear pore complex
- Nucleocytoplasmic transport
- Nucleoside triphosphatase
ASJC Scopus subject areas
- Clinical Biochemistry
- Molecular Biology
- Genetics
- Cell Biology
Cite this
Age- and sex-related differences in nuclear lipid content and nucleoside triphosphatase activity in the JCR : LA-cp corpulent rat. / Czubryt, Michael P.; Russell, James C.; Sarantopoulos, John; Gilchrist, James S C; Pierce, Grant N.
In: Molecular and Cellular Biochemistry, Vol. 176, No. 1-2, 1997, p. 327-335.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Age- and sex-related differences in nuclear lipid content and nucleoside triphosphatase activity in the JCR
T2 - LA-cp corpulent rat
AU - Czubryt, Michael P.
AU - Russell, James C.
AU - Sarantopoulos, John
AU - Gilchrist, James S C
AU - Pierce, Grant N.
PY - 1997
Y1 - 1997
N2 - The putative role of the nuclear nucleoside triphosphatase (NTPase) is to provide energy to the nuclear pore complex for poly A(+) mRNA export. Previous work has demonstrated that liver nuclear NTPase activity is greater in 6 month old corpulent (cp/cp) female JCR:LA rats, a hyperlipidemic rat model, compared to lean (+/?) animals. This increase appeared to be related to increases in nuclear membrane cholesterol content. The current study extended these initial data to compare NTPase activity as a function of age and sex in isolated JCR:LA-cp rat liver nuclei, to further test the hypothesis that nuclear membrane cholesterol may modulate NTPase activity. NTPase activity was increased in cp/cp female animals compared to +/? females at all ages studied, with V(max) values increased by 60-176%. Membrane integrity of cp/cp female nuclei was reduced compared to +/? female nuclei. Nuclear membrane cholesterol levels increased linearly with age by 50, 150 and 250% in 3, 6 and 9 month old cp/cp females over leans. In contrast, nuclei from cp/cp males exhibited only minor, isolated changes in NTPase activity. Furthermore, there were no significant changes in nuclear cholesterol content or membrane integrity in the less hyperlipidemic male animals at any age. These data suggest that altered lipid metabolism may lead to changes in nuclear membrane structure, which in turn may alter NTPase activity and functioning of the nuclear pore complex.
AB - The putative role of the nuclear nucleoside triphosphatase (NTPase) is to provide energy to the nuclear pore complex for poly A(+) mRNA export. Previous work has demonstrated that liver nuclear NTPase activity is greater in 6 month old corpulent (cp/cp) female JCR:LA rats, a hyperlipidemic rat model, compared to lean (+/?) animals. This increase appeared to be related to increases in nuclear membrane cholesterol content. The current study extended these initial data to compare NTPase activity as a function of age and sex in isolated JCR:LA-cp rat liver nuclei, to further test the hypothesis that nuclear membrane cholesterol may modulate NTPase activity. NTPase activity was increased in cp/cp female animals compared to +/? females at all ages studied, with V(max) values increased by 60-176%. Membrane integrity of cp/cp female nuclei was reduced compared to +/? female nuclei. Nuclear membrane cholesterol levels increased linearly with age by 50, 150 and 250% in 3, 6 and 9 month old cp/cp females over leans. In contrast, nuclei from cp/cp males exhibited only minor, isolated changes in NTPase activity. Furthermore, there were no significant changes in nuclear cholesterol content or membrane integrity in the less hyperlipidemic male animals at any age. These data suggest that altered lipid metabolism may lead to changes in nuclear membrane structure, which in turn may alter NTPase activity and functioning of the nuclear pore complex.
KW - Hypercholesterolemia
KW - Nuclear membrane
KW - Nuclear pore complex
KW - Nucleocytoplasmic transport
KW - Nucleoside triphosphatase
UR - http://www.scopus.com/inward/record.url?scp=0030810121&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0030810121&partnerID=8YFLogxK
U2 - 10.1023/A:1006877818372
DO - 10.1023/A:1006877818372
M3 - Article
C2 - 9406178
AN - SCOPUS:0030810121
VL - 176
SP - 327
EP - 335
JO - Molecular and Cellular Biochemistry
JF - Molecular and Cellular Biochemistry
SN - 0300-8177
IS - 1-2
ER -