Cardiovascular DiseasesNCT00005565
Mechanisms of Low Levels of Apolipoprotein B
An observational study of Cardiovascular Diseases and Heart Diseases, run by National Heart, Lung, and Blood Institute (NHLBI).
Trial summary
To determine mechanisms of low levels of apolipoprotein B. Read more about this study
- Who is it for?
- Ages Up to 100 years, men only
- Conditions the study is for
- Cardiovascular Diseases, Heart Diseases, Hypobetalipoproteinemia
- How many people
- Not given
- Where
- No sites listed yet
- Study dates
- Aug 1997to Jun 2002
- Phase
- Observational
- Are there results?
- None posted in the registry
Key requirements
Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.
- Ages Up to 100 years
- Men only
- No healthy volunteers
- Child, Adult, Older adult
No eligibility criteria
About this study
To determine mechanisms of low levels of apolipoprotein B.
Read the detailed description
BACKGROUND:
Elevated apoB levels are associated with an increased risk of coronary heart disease. Hypobetalipoproteinemia (HBLP) is characterized by apoB levels less than the 5 percentile. Dr. Welty, the principal investigator, sequenced mutations for truncated forms of apoB-67, apoB-55 and apoB-44.4 which causes HBLP, described a kindred from the Framingham Heart Study with HBLP due to an unidentified apoB gene mutation and purified apoB-67 containing lipoprotein particles. Heterozygous apoB-67 subjects have one normal allele making apoB-100; therefore, apoB levels would be predicted to be at least 50 percent of normal; however, they are 24 percent of normal. Dr. Welty has shown that these lower than expected levels result from decreased production of VLDL apoB-100, LDL apoB-100 and apoB-67, increased catabolism of VLDL apoB-100, and increased direct removal of apoB-67 from VLDL.
DESIGN NARRATIVE:
The first aim is to locate the apoB gene mutation in the Framingham kindred. The second aim is to perform stable isotope studies in the apoB-55 and apoB-44.4 kindreds to determine if apoB metabolism for these shorter truncations is similar to that for apoB-67. In aim three, apoB-100 synthesis is studied in heterozygous apoB-70 transgenic mice. If it is 25-25 percent of normal litter mates, the mechanism for this reduction in apoB-100 levels will be studied in hepatocytes isolated from the transgenic mice. In specific aim 4, size and composition of VLDL are compared in apoB-67 subjects and controls to determine if larger size or compositional changes account for the faster catabolism of VLDL apoB-100. The study has been extended through June 2007.
- Medical subject headings
- Cardiovascular Diseases, Heart Diseases, Hypobetalipoproteinemias
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted26 May 2000 (estimated)
- Study startAug 1997
- Primary completionJun 2002
- Study completionJun 2002
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Publications (5)Papers the sponsor has linked to this study.
- Other trials for Cardiovascular DiseasesStudies of the same condition, open and under way.
- More trials run by National Heart, Lung, and Blood Institute (NHLBI)The sponsor's other registered studies.
- What the trial phases meanHow a treatment moves from first tests in people to approval.
More details
For doctors and researchers: how the study is designed, who runs it, and its registry IDs.
Study design
- Study type
- Observational
Sponsor and investigators
- Sponsor type
- US National Institutes of Health
- Investigators
- Francine Welty, Beth Israel Deaconess Medical Center
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT00005565
- Sponsor's protocol ID
- 5114
- Other IDs
- R01HL056895
- Status last verified
- Jan 2008
- First submitted
- 25 May 2000
- Last updated
- 29 Jul 2016
- Results posted
- No
Publications
Welty FK, Lichtenstein AH, Barrett PH, Dolnikowski GG, Schaefer EJ. Human apolipoprotein (Apo) B-48 and ApoB-100 kinetics with stable isotopes. Arterioscler Thromb Vasc Biol. 1999 Dec;19(12):2966-74. doi: 10.1161/01.atv.19.12.2966.
PubMed 10591677Welty FK, Lichtenstein AH, Barrett PH, Jenner JL, Dolnikowski GG, Schaefer EJ. Effects of ApoE genotype on ApoB-48 and ApoB-100 kinetics with stable isotopes in humans. Arterioscler Thromb Vasc Biol. 2000 Jul;20(7):1807-10. doi: 10.1161/01.atv.20.7.1807.
PubMed 10894821Welty FK, Guida KA, Andersen JJ. Donor splice-site mutation (210+1G_C) in the ApoB gene causes a very low level of ApoB-100 and LDL cholesterol. Arterioscler Thromb Vasc Biol. 2001 Nov;21(11):1864-5. No abstract available.
PubMed 11701479Matthan NR, Welty FK, Barrett PH, Harausz C, Dolnikowski GG, Parks JS, Eckel RH, Schaefer EJ, Lichtenstein AH. Dietary hydrogenated fat increases high-density lipoprotein apoA-I catabolism and decreases low-density lipoprotein apoB-100 catabolism in hypercholesterolemic women. Arterioscler Thromb Vasc Biol. 2004 Jun;24(6):1092-7. doi: 10.1161/01.ATV.0000128410.23161.be. Epub 2004 Apr 15.
PubMed 15087307Welty FK, Lichtenstein AH, Barrett PH, Dolnikowski GG, Schaefer EJ. Interrelationships between human apolipoprotein A-I and apolipoproteins B-48 and B-100 kinetics using stable isotopes. Arterioscler Thromb Vasc Biol. 2004 Sep;24(9):1703-7. doi: 10.1161/01.ATV.0000137975.14996.df. Epub 2004 Jul 8.
PubMed 15242863
Study at a glance
From the registry record, last updated by the sponsor on 29 Jul 2016. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- Mechanisms of Low Levels of Apolipoprotein B
- ClinicalTrials.gov ID
- NCT00005565
- Acronym / sponsor ID
- 5114
- Study type
- Observational
- Recruitment status
- Completed
- Lead sponsor
- National Heart, Lung, and Blood Institute (NHLBI)US National Institutes of Health
- Study start
- Aug 1997
- Primary completion
- Jun 2002 (actual)
- Study completion
- Jun 2002 (actual)
- First posted
- 26 May 2000 (estimated)
- Results
- Not posted in the source record
Clinical summary
The research question as the sponsor registered it. This describes what the study plans to test, not what it found.
To determine mechanisms of low levels of apolipoprotein B.
Detailed description
BACKGROUND:
Elevated apoB levels are associated with an increased risk of coronary heart disease. Hypobetalipoproteinemia (HBLP) is characterized by apoB levels less than the 5 percentile. Dr. Welty, the principal investigator, sequenced mutations for truncated forms of apoB-67, apoB-55 and apoB-44.4 which causes HBLP, described a kindred from the Framingham Heart Study with HBLP due to an unidentified apoB gene mutation and purified apoB-67 containing lipoprotein particles. Heterozygous apoB-67 subjects have one normal allele making apoB-100; therefore, apoB levels would be predicted to be at least 50 percent of normal; however, they are 24 percent of normal. Dr. Welty has shown that these lower than expected levels result from decreased production of VLDL apoB-100, LDL apoB-100 and apoB-67, increased catabolism of VLDL apoB-100, and increased direct removal of apoB-67 from VLDL.
DESIGN NARRATIVE:
The first aim is to locate the apoB gene mutation in the Framingham kindred. The second aim is to perform stable isotope studies in the apoB-55 and apoB-44.4 kindreds to determine if apoB metabolism for these shorter truncations is similar to that for apoB-67. In aim three, apoB-100 synthesis is studied in heterozygous apoB-70 transgenic mice. If it is 25-25 percent of normal litter mates, the mechanism for this reduction in apoB-100 levels will be studied in hepatocytes isolated from the transgenic mice. In specific aim 4, size and composition of VLDL are compared in apoB-67 subjects and controls to determine if larger size or compositional changes account for the faster catabolism of VLDL apoB-100. The study has been extended through June 2007.
Study design
Who may qualify
- Ages
- Up to 100 years
- Sex
- Male only
- Healthy volunteers
- Not accepted
- Age groups
- Child, Adult, Older adult
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Primary outcome
Not reported in the source record.
Results and safety
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 29 Jul 2016.
- Background: PubMed 10591677Welty FK, Lichtenstein AH, Barrett PH, Dolnikowski GG, Schaefer EJ. Human apolipoprotein (Apo) B-48 and ApoB-100 kinetics with stable isotopes. Arterioscler Thromb Vasc Biol. 1999 Dec;19(12):2966-74. doi: 10.1161/01.atv.19.12.2966.
- Background: PubMed 10894821Welty FK, Lichtenstein AH, Barrett PH, Jenner JL, Dolnikowski GG, Schaefer EJ. Effects of ApoE genotype on ApoB-48 and ApoB-100 kinetics with stable isotopes in humans. Arterioscler Thromb Vasc Biol. 2000 Jul;20(7):1807-10. doi: 10.1161/01.atv.20.7.1807.
- Background: PubMed 11701479Welty FK, Guida KA, Andersen JJ. Donor splice-site mutation (210+1G_C) in the ApoB gene causes a very low level of ApoB-100 and LDL cholesterol. Arterioscler Thromb Vasc Biol. 2001 Nov;21(11):1864-5. No abstract available.
- Background: PubMed 15087307Matthan NR, Welty FK, Barrett PH, Harausz C, Dolnikowski GG, Parks JS, Eckel RH, Schaefer EJ, Lichtenstein AH. Dietary hydrogenated fat increases high-density lipoprotein apoA-I catabolism and decreases low-density lipoprotein apoB-100 catabolism in hypercholesterolemic women. Arterioscler Thromb Vasc Biol. 2004 Jun;24(6):1092-7. doi: 10.1161/01.ATV.0000128410.23161.be. Epub 2004 Apr 15.
- Background: PubMed 15242863Welty FK, Lichtenstein AH, Barrett PH, Dolnikowski GG, Schaefer EJ. Interrelationships between human apolipoprotein A-I and apolipoproteins B-48 and B-100 kinetics using stable isotopes. Arterioscler Thromb Vasc Biol. 2004 Sep;24(9):1703-7. doi: 10.1161/01.ATV.0000137975.14996.df. Epub 2004 Jul 8.
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Referral and contact
AzTrials does not enrol participants or take referrals. Contact the study team or a site listed below; they decide who can take part. This study is not recruiting at the moment.
Francine Welty
Beth Israel Deaconess Medical Center
Questions about this trial
What is this clinical trial studying?
An observational study of Cardiovascular Diseases and Heart Diseases, run by National Heart, Lung, and Blood Institute (NHLBI).
The full registered description is in the About this study section and the official record.
Who may be eligible to take part?
Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.
Is this clinical trial currently recruiting?
The record says: finished, as of the sponsor's last update on 29 Jul 2016. Status can change between updates, so confirm with the study contact before making plans.
What are the possible benefits and risks?
They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.
Are results available for this study?
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
How can a doctor refer a patient or contact the research team?
The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.
Where can I read the original study information?
On the ClinicalTrials.gov record for NCT00005565, which also lists 5 linked publications.
Does a listing mean the treatment is approved or proven to work?
No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.
How often is this information updated?
AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 29 Jul 2016.