Biomedical subjects

J R Kamanitz

Publications and source records attributed to J R Kamanitz.

3 recordsLinked to original sources

PubMed1991

Headaches and psychoactive substance use.

A number of clinical reports have revealed an association between the use of alcohol and drugs and the onset or exacerbation of headaches. In order to investigate this association systematically and to examine the temporal relationship between onset of headaches and psychoactive substance use, we analyzed responses to a self-report questionnaire from 267 consecutive admissions to a three-week inpatient substance abuse treatment program. The response rate was 89.7%. The following characteristics were noted in the 236 respondents: 1) Over 89% reported having experienced some type of headache. 2) Headache-free individuals were significantly older than headache sufferers. 3) Women were much more likely to have migraine headaches than men. 4) Onset of migraines occurred prior to onset of substance use, while onset of tension headaches occurred after onset of substance use. Although associational data must be interpreted with caution, an intriguing hypothesis compatible with the finding is that migraines may play a role in the genesis of substance use, while substance use may play a role in the genesis of tension headaches.

Adult↗

PubMed1989

Delusional misidentification involving the self.

The delusion of replacement of one's self by a double or imposter is a feature of two delusional misidentification syndromes. In the syndrome of subjective doubles, the self-delusional misidentification syndromes. In the syndrome of subjective doubles, the self-delusion is the sole delusion of doubles. In the Capgras syndrome, the delusion of a self-double is infrequently reported; however, when it is reported, self-replacement is always accompanied by delusions of duplication of other people and sometimes of places. We review all such cases reported since 1900 and highlight the variety of presentations.

Delusions↗

PubMed1986

Cartilage proteoglycan core protein gene expression during limb cartilage differentiation.

Changes in the steady-state cytoplasmic levels of mRNA for the core protein of the major sulfated proteoglycan of cartilage were examined during the course of limb chondrogenesis in vitro using cloned cDNA probes. Cytoplasmic core protein mRNA begins to accumulate at the onset of overt chondrogenesis in micromass culture coincident with the crucial condensation phase of the process, in which prechondrogenic mesenchymal cells become closely juxtaposed prior to depositing a cartilage matrix. The initiation of core protein mRNA accumulation coincides with a dramatic increase in the accumulation of mRNA for type II collagen, the other major constituent of hyaline cartilage matrix. Following condensation, there is a concomitant progressive increase in cytoplasmic core protein and type II collagen mRNA accumulation which parallels the progressive accumulation of cartilage matrix by the cells. The relative rate of accumulation of cytoplasmic type II collagen mRNA is greater than twice that of core protein mRNA during chondrogenesis in micromass culture. Cyclic AMP, an agent implicated in the regulation of chondrogenesis elicits a concomitant two- to fourfold increase in both cartilage core protein and type II collagen mRNA levels by limb mesenchymal cells. Core protein gene expression is more sensitive to cAMP than type II collagen gene expression. These results suggest that the cartilage proteoglycan core protein and type II collagen genes are coordinately regulated during the course of limb cartilage differentiation, although there are quantitative differences in the extent of expression of the two genes.

Age Factors↗