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Results for “Triiodobenzoic Acids”

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At least 19 recordsLinked to original sources
PubMed1986

3,4,5-Triiodobenzoic acid affects [3H]verapamil binding to plant and animal membrane fractions and smooth muscle contraction.

3,4,5-Triiodobenzoic acid, known as auxin transport inhibitor, stimulates specific [3H]verapamil binding to zucchini microsomes by 100% (EC50 = 1 microM). This stimulatory effect is due to a decrease of the apparent equilibrium dissociation constant KD for verapamil from 60 nM to 33 nM without significantly changing the maximum number of binding sites. 3,4,5-Triiodobenzoic acid also increases specific [3H]verapamil binding to rabbit skeletal muscle membranes (EC50 greater than or equal to 20 microM) without affecting [3H]nitrendipine and [3H]-d-cis-diltiazem binding. If 3,4,5-triiodobenzoic acid is added to isolated rings of rabbit A. saphena contracted by potassium depolarization, a dose-dependent relaxation is observed with an IC50 value of about 8 microM. Contractions initiated by the addition of 3 microM norepinephrine can also be abolished by 3,4,5-triiodobenzoic acid with half maximal inhibition at 40 microM.

Animals↗
PubMed1980

Inhibition of respiration and ion uptake by 2,3,5-triiodobenzoic Acid in excised barley roots.

The addition of 1 micromolar 2,3,5-triiodobenzoic acid (TIBA) to solutions containing KCl resulted in the inhibition of K and Cl uptake in excised barley roots. The effectiveness of TIBA as an inhibitor increased as the pH of the treatment solution decreased and approached the pK(a) of TIBA. A lag period of approximately 20 minutes existed prior to the onset of TIBA induced inhibition of ion uptake. Respiratory activity was also inhibited by TIBA. The data suggest that in this material, TIBA functions by entering the cytoplasm and inhibiting metabolism. Comparisons made on the effect of added Ca, showed that at pH 5.7 and higher, Ca had no effect on ion uptake whereas at lower pH values the presence of Ca enhanced uptake by offsetting the deleterious effects of H(+).

Journal Article↗
PubMed1978

Cytogenetic effects of contrast media and triiodobenzoic acid derivatives in human lymphocytes.

Micronuclei counts in blood samples from 9 patients before and after angiocardiography have confirmed previous results suggesting the diatrizoate contrast medium was largely responsible for the observed cytogenetic damage. To discover the agents in the medium causing the cytogenetic damage, we exposed human lymphocyte cultures to diatrizoate and to the monoamino- and diamino-derivatives of triiodobenzoic acid. The results show the amino-derivatives are capable of inhibiting mitosis and inducing micronuclei and chromosome aberrations at lower concentrations than diatrizoate.

Adolescent↗
PubMed1981

Inhibitory effects of 2,3,5-triiodobenzoic Acid on ion absorption, respiration, and carbon metabolism in excised barley roots.

The ability of 2,3,5-triiodobenzoic acid (TIBA) to alter ion absorption, respiration, carbon metabolism, and the permeability of the cell membranes of excised barley roots has been examined. Roots pretreated in either H(2)O, KCl, or TIBA followed by treatment in KCl, TIBA, or KCl and TIBA demonstrated that inhibition of ion uptake due to TIBA was reversible. These studies also suggest that ions already accumulated within the vacuole remain sequestered after the addition of TIBA, whereas cytoplasmic ions leak out into the external medium. A 20-minute lag period was present prior to the onset of inhibition of O(2) consumption by TIBA. A b-type cytochrome from corn that is apparently associated with the plasmalemma and possibly involved in respiration or ion uptake, or both, was unaffected by TIBA. The addition of TIBA to treatment solutions resulted in the synthesis and accumulation of ethanol. Analysis of organic acids showed that only the malate concentration was affected by treatment with TIBA. A reduction of 26% was noted for malate in the presence of 2 micromolar TIBA. These combined results suggest that the inhibitory action of TIBA in barley roots involves an alteration of mitochondrial respiration and not a direct depolarization of the plasmalemma.

Journal Article↗
PubMed2001

Triiodobenzoic acid, an auxin polar transport inhibitor, suppresses somatic embryo formation and postembryonic shoot/root development in Eleutherococcus senticosus.

The effect of auxin polar transport inhibitor on somatic embryo development and postembryonic growth in Siberian ginseng (Eleutherococcus senticosus) was examined. In the presence of 2,3,5-triiodobenzoic acid (TIBA), an auxin polar transport inhibitor, embryo formation from embryogenic cells was suppressed, while cell division was not affected. When globular embryos at different stages were transferred onto medium containing TIBA, development of axial and bilateral polarity was suppressed in a stagespecific manner. In abnormal embryos induced by TIBA, further development of shoot and root apical meristems and vascular differentiation was also suppressed. Thus, abnormal development of embryos induced by inhibition of auxin polar transport resulted in plantlets without shoots and roots.

Journal Article↗
PubMedDate not supplied

Treatment of sudden deafness with sodium salts of triiodobenzoic acid derivatives.

Twenty-two patients with a complaint of sudden deafness were treated with one of the other of two radiopaque contrast media, 9 received daily doses of sodium iothalamate, and 13 were treated similarly with methylglucamine and sodium iodamide. Four of the first group and eight of the second demonstrated either an effective partial or a complete recovery of hearing function. Those failing to respond were generally classified completely deaf at admission and report nausea, vomiting, or vertigo at onset of sudden deafness. Treatment with sodium salts of triiodobenzoic acid derivatives, i.e., sodium iothalamate and methylglucamine and sodium iodamide, is judged to be effective in selected cases of sudden deafness.

Adolescent↗
PubMed2000

Decrease in the regeneration potential of long-term cell suspension cultures of Lilium formosanum Wallace and its restoration by the auxin transport inhibitor, 2,3,5-triiodobenzoic acid.

Cell suspension cultures of Lilium formosanum Wallace were initiated from bulb scale-derived calli and subcultured every 2 weeks using a medium containing 5 µM 4-amino-3,5,6-trichloropicolinic acid (picloram). Almost all cell clumps from the suspension cultures developed numerous somatic embryos following their transfer onto a plant growth regulator-free medium, while they vigorously produced shoot buds on media containing 0.5 or 5 µM 6-benzyladenine (BA). The high regeneration potential on a plant growth regulator-free medium was maintained for up to 54 months, but it gradually decreased thereafter, and only a few adventitious shoots and embryos were obtained from 75-month-old cultures. For restoring the regeneration potential of these cultures, various treatments with plant growth regulators were applied, among which about 10-fold increases in the number of regenerated shoot buds were obtained with 0.5 or 5 µM 2,3,5-triiodobenzoic acid (TIBA) in combination with 0.5 or 5 µM BA or N-(1,2,3-thiadiazol-5-yl)-N'-phenylurea (thidiazuron). Only shoot buds were produced from the cell clumps cultured on TIBA-containing media, and these shoot buds developed into complete plantlets after they were excised from the calli and transferred to a plant growth regulator-free medium.

Journal Article↗